Gerenciamento de Energia
Subcategorias
Produtos (2819)
RP114N331D-TR-FE - 300mA, 3.3V CMOS LDO | Nisshinbo
The Nisshinbo Micro Devices RP114N331D-TR-FE is a CMOS low-dropout (LDO) linear regulator providing a fixed 3.3V at up to 300 mA from a SOT-23-5 surface-mount package. The part is offered in tape-and-reel packaging (-TR-FE) and is part of the wider RP114 family whose output voltage can be specified from 0.8V to 3.6V in 0.1V increments. An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is only marginally higher than the desired output. In the broader power-management taxonomy, LDOs sit alongside DC-DC converters as the final stage that delivers clean, low-noise rails to noise-sensitive loads such as microcontrollers, sensors, and RF blocks, with the trade-off of lower efficiency at large VIN-VOUT deltas. Key features highlighted in the manufacturer literature include a minimum input voltage of 1.4V, a supply current of approximately 50 µA, CMOS process construction, and a fixed 3.3V output for this variant. The SOT-23-5 footprint keeps board area small while exposing an enable input and the required input/output capacitors for stable operation. Per the Nisshinbo Micro Devices product page, the RP114 series targets low-voltage, low-power applications that demand tight output tolerance with a compact footprint. The CMOS implementation provides low quiescent current for battery-operated designs, while the 300 mA rating is sufficient for low-power MCUs, Bluetooth Low Energy radios, sensor hubs, and other portable subsystems. The fixed 3.3V option is commonly paired with 1.8V-core processors and 3.3V peripherals, simplifying BOM by eliminating external feedback resistors. Typical applications include IoT sensor nodes, wearable electronics, portable instrumentation, microcontroller power rails, and wireless module supplies where a small footprint and low quiescent current are prioritized. Choose this part when a compact, fixed 3.3V LDO with low standby current is needed in a SOT-23-5 footprint. When designing with this device, ensure input and output capacitors meet the ESR and value requirements in the datasheet to guarantee stability. Place the input capacitor close to VIN and the output capacitor close to VOUT to minimize parasitic loop area and high-frequency ringing. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
RP130N151A-TR-F - 150mA CMOS LDO Regulator, 1.5V Fixed | Nisshinbo
The Nisshinbo Micro Devices RP130N151A-TR-F is a CMOS-based low-dropout (LDO) linear regulator delivering a fixed 1.5V output at up to 150 mA from a 5-pin SOT-23-5 package. It provides 80 dB ripple rejection and an ultra-low 38 uA typical supply current, with excellent line transient response for stable operation under dynamic load conditions. The IC also features a power-good (PG) detection output that flags when the regulated rail is within specification, useful for power-rail sequencing in microcontrollers and multi-rail systems. An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage. The category sits inside the broader family of linear regulators, which in turn belongs to voltage regulators and the wider power-management IC hierarchy. LDOs are valued for their clean output (no switching noise), small footprint, and simplicity compared to switching DC-DC converters, making them the preferred choice for low-current, noise-sensitive rails. Key differentiating features of the RP130N151A-TR-F include 80 dB ripple rejection (at 1 kHz typical), a CMOS process that yields 38 uA quiescent current, an integrated Power-Good (PG) signal output, and built-in current limit plus thermal shutdown protection. The fixed 1.5 V output is internally trimmed, removing the need for external feedback resistors and saving PCB area. Combined with the small SOT-23-5 footprint, these features support compact, battery-powered designs requiring a clean 1.5 V rail. The device operates across a wide input range (typically up to around 6 V for the RP130x family) and uses a CMOS pass element rather than a bipolar PNP, which reduces ground-pin current at high loads. The high ripple rejection makes the regulator well suited for post-regulation after a switching pre-regulator, where residual switching ripple on the upstream rail would otherwise couple into sensitive analog circuitry. Typical applications include microcontroller (MCU) core supply, real-time clock (RTC) backup rails, sensor bias, low-power wireless modules, and battery-powered portable devices such as wearables and IoT endpoints. The 1.5 V output is convenient for powering low-voltage MCUs, memory ICs, and RF transceivers that nominally require 1.5 V supplies from a higher-voltage battery. When designing with this regulator, ensure that the input-to-output voltage headroom satisfies the dropout requirement at full 150 mA load, and place the input/output ceramic capacitors close to the device pins for stable regulation. The PG pin can be left open if unused, simplifying designs that do not require power-rail sequencing feedback. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
RP130N151A-TR-FE - 150mA Low-Noise LDO 1.5V Fixed | Nisshinbo
The Nisshinbo Micro Devices RP130N151A-TR-FE is a 150 mA CMOS-based low-dropout (LDO) linear voltage regulator with a fixed 1.5 V output, supplied in a 5-pin SOT-23-5 (SOT-753 / SC-74A) surface-mount package. The RP130x series combines a high ripple-rejection figure of 80 dB with ultra-low supply current of 38 uA typical, making it well suited to always-on, battery-powered designs where quiescent draw matters as much as load transient response. An LDO (low-dropout) regulator is a class of linear voltage regulator that maintains a stable output voltage even when the input-to-output differential drops to a few hundred millivolts. Within the broader power-management taxonomy, the RP130 family sits at the bottom of the chain: AC/DC or DC/DC switching converter -> LDO -> load. Placing an LDO downstream of a switching pre-regulator cleans up switching ripple while preserving the low-noise floor demanded by analog and RF signal-chain blocks. Key specifications of the RP130N151A-TR-FE include a fixed 1.5 V positive output, 150 mA continuous load capability, 80 dB ripple rejection for clean post-regulation, and a typical quiescent current of 38 uA that extends battery life in standby. The CMOS process enables fast line-transient response, a low internal reference error, and stable operation with small ceramic output capacitors. Built-in protection includes current limit and thermal shutdown, and the part is specified across an extended industrial temperature range. Typical applications span wearable and portable electronics, IoT sensor nodes, low-power MCUs and real-time-clock (RTC) supplies, and post-regulation stages for switching converters powering RF transceivers, image sensors, or precision analog blocks. The SOT-23-5 footprint is one of the smallest standard SMD regulator packages, enabling high-density board layouts. When designing with the RP130N151A, place the input and output ceramic capacitors as close as possible to the IC, ensure the input voltage stays above the minimum operating rail under all transient conditions, and verify thermal dissipation at the maximum load - even small SOT-23-5 packages can heat up at high dropout. This page synthesizes distributor pricing, drop-in same-package alternatives, and design notes not found in the bare manufacturer datasheet.
RP173N301B-TR-F - 150mA 3.0V LDO Regulator | Nisshinbo
The Nisshinbo Micro Devices RP173N301B-TR-F is a 150 mA low-dropout linear voltage regulator with a fixed 3.0 V positive output, housed in a 5-pin SOT-23-5 (SOT-753 / SC-74A) surface-mount package. It accepts an input voltage of up to 11 V, providing a regulated 3.0 V rail with typical dropout of 0.36 V at 150 mA load, and includes built-in reverse-current protection for redundant-power and OR-ing topologies. The device is qualified for an operating junction temperature range of -40C to +105C and ships on 3000-piece tape-and-reel. An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is only marginally higher than the regulated output. Within the broader power-management hierarchy, LDOs sit beneath switching DC-DC converters in efficiency but offer lower output noise, faster transient response, smaller PCB area, and fewer external components. The RP173 belongs to the linear regulator family of PMICs (power management ICs) and is typically deployed as a post-regulator stage that cleans up the residual ripple of an upstream switching converter, or as a primary rail in low-current battery-powered systems where noise immunity is more important than conversion efficiency. Key features of the RP173N301B-TR-F include a 3.0 V fixed output trimmed at the factory (no external feedback resistors required), typical quiescent current in the microampere range, an integrated reverse-current blocking circuit that prevents current backflow when VIN falls below VOUT, internal current limiting and thermal shutdown, and a stable operation profile with small ceramic output capacitors. The CE logic enables the output when asserted high, supporting power-sequenced multi-rail systems. Architecturally, the RP173 uses a CMOS pass element rather than a PNP bipolar transistor, which keeps quiescent current low and dropout voltage competitive at moderate loads. The internal bandgap reference and error amplifier set the line and load regulation, while the reverse-current block uses a dedicated control loop to detect and disable the pass element whenever VOUT exceeds VIN, a feature rarely found in comparable sub-1 mm-thickness SOT-23-5 LDOs. Typical applications include microcontroller and MCU core-logic rails in IoT and wearable designs, sensor bias supplies for industrial control modules, backup-battery OR-ing outputs in portable medical and e-meter designs, post-regulation for switching converters in noise-sensitive RF receivers, and as a low-cost local regulator in USB-powered consumer devices. In each case, the 150 mA rating and 3.0 V output are matched to low-power digital or analog sub-systems rather than to high-current power stages. A key design consideration is that although the absolute maximum input voltage is 11 V, dropout must be respected at full load: at 150 mA the typical dropout is approximately 0.36 V, so the input rail must remain above approximately 3.36 V under worst-case load and temperature to keep the output in regulation. Designers should also leave adequate copper area for thermal dissipation, since a 5 V-to-3.0 V conversion at 150 mA still dissipates around 0.3 W. This page synthesizes distributor stock and pricing data, pin-compatible Nisshinbo RP173x family variants, drop-in alternatives from alternative brands, and practical thermal / PCB layout notes that go beyond the manufacturer datasheet's typical-application section.
RP173N301B-TR-FE - 3.0V 150mA CMOS LDO | Nisshinbo
The Nisshinbo Micro Devices RP173N301B-TR-FE is a 150 mA CMOS low-dropout (LDO) linear regulator housed in a 5-pin SOT-23 (SOT-23-5) surface-mount package with a fixed 3.0 V positive output. It accepts an input voltage up to 11 V, draws a typical quiescent current of 2.0 µA, and integrates reverse-current protection, making it suitable for standby-power applications where the host system may briefly back-drive the regulator output. The -TR suffix designates Tape & Reel packaging and -FE denotes lead-free / Pb-free termination. An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage. Within the broader power management hierarchy, an LDO is a sub-category of linear regulator, which itself sits under voltage regulators and ultimately under power management ICs. LDOs are preferred over switching regulators in noise-sensitive applications because they introduce no switching ripple, at the cost of lower efficiency when the input-to-output voltage differential is large. Key features of the RP173N301B-TR-FE include a low typical supply current of 2.0 µA, integrated reverse-current (back-flow) protection, a fixed 3.0 V output trimmed at the factory, and an 11 V maximum input rating that supports 2-cell alkaline or 1-cell Li-ion derived rails. The device is part of the broader RP173 series, which offers multiple fixed output voltages and two output-grade variants (A/B) for different load-capability profiles. The RP173 uses a CMOS pass element with a precision bandgap reference. Its low Iq minimizes battery drain during standby, and the reverse-current block prevents current flow from a higher downstream rail back into the LDO output, which is critical when the device is paralleled with another supply or when the load is hot-plugged. Typical applications include standby-power rails in microcontroller-based appliances, IoT sensor nodes, and battery-powered portable equipment. The 150 mA current capability and 3.0 V fixed output are well matched to RTC backup domains, low-power MCU cores, and wireless SoC sleep rails. When designing with this part, ensure that the input supply does not exceed 11 V and that the load does not demand more than 150 mA continuously. Place the input and output decoupling capacitors immediately adjacent to the IC pins to maintain loop stability. This page synthesizes distributor stock data, parametric drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
RP173N331B-TR-FE - 3.3V 150mA LDO Regulator SOT-23-5 | Nisshinbo
The Nisshinbo Micro Devices RP173N331B-TR-FE is a 150 mA CMOS low-dropout (LDO) linear regulator with a fixed 3.3 V output in a 5-pin SOT-23-5 surface-mount package. It accepts an input voltage up to 11 V (datasheet limit; distributors cite 9.8 V max in their parametric filters) and delivers up to 150 mA with a typical dropout of 610 mV at full load. The device draws only 2.0 µA typical quiescent current, making it well suited for always-on and battery-backed rails. An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is only slightly above the desired output. Within the power management hierarchy, the RP173N331B sits under linear regulators, which sit under voltage regulators, which are part of the broader power management IC category. Unlike switching regulators, an LDO trades efficiency for ultra-low noise and a minimal external bill of materials, requiring only input and output capacitors. Key features of the RP173N331B-TR-FE include reverse-current protection, a built-in current limiter, thermal shutdown, and CMOS process technology that delivers the 2.0 µA quiescent current. The fixed 3.3 V output is internally trimmed, so no external feedback resistors are required. The combination of small SOT-23-5 footprint, low IQ, and reverse-current blocking makes the part especially attractive in standby-power designs where the regulator must not leak back into a battery when system voltage collapses. The RP173N331B uses a PMOS pass element architecture, which is why the input voltage can swing close to the output while still regulating, and why the reverse-current block is straightforward to implement. Internal protection features (foldback current limit and thermal shutdown with auto-recovery) allow the part to survive momentary short-circuit and overtemperature events without latch-up. The reference and error amplifier are trimmed at wafer level, so output accuracy is achieved without laser trim or external pots. Typical applications for the RP173N331B include standby rails in white goods and home appliances, IoT sensor nodes powered by coin-cell or Li-ion batteries, microcontroller (MCU) always-on domains, RTC and memory backup supplies, and post-regulation after a switching converter in noise-sensitive analog blocks. The 3.3 V fixed output is a direct match for many low-power MCUs and Bluetooth Low Energy (BLE) SoCs. When designing with the RP173N331B, place the input and output capacitors as close to the IC as possible. A 1 µF or larger ceramic on each rail is normally sufficient; verify stability with the manufacturer's ESR-versus-capacitance chart before substituting. Ensure that VIN never exceeds 11 V, even under transient conditions, and that PCB layout keeps the thermal pad area adequate for the expected dissipation (max ~150 mW in SOT-23-5 at 25 °C). This page synthesizes distributor pricing, same-brand and cross-brand drop-in alternatives, application reference designs, and practical design notes not collected in any single location on the manufacturer datasheet or distributor product page.
RT1985 - 23V/8A Ideal Diode Protection Switch | Richtek
The Richtek RT1985 is a 23V/8A ideal diode protection switch with reverse current blocking, integrated back-to-back 20mΩ MOSFETs, a 3.4V to 23V input operating range, 8A continuous current rating, and a 20A peak current rating, housed in a VDFN-12TL 3x3 package with a 28V absolute maximum rating. An ideal diode protection switch is a high-side power path protection device that replaces a discrete Schottky diode with an actively controlled MOSFET. In the broader power management hierarchy (ideal diode controller -> high-side protection switch -> power management IC), it forwards current with a very low forward voltage drop while actively blocking reverse current when the input falls below the output. This makes it fundamental in diode-OR power source sharing, where two supplies must feed one load without back-feeding each other. Key features include the integrated back-to-back 20mΩ MOSFETs, which deliver both forward conduction and true reverse current blocking in a single IC, eliminating the external MOSFET and sense elements of conventional ideal diode controllers. The low forward voltage at multi-amp loads dramatically reduces conduction loss and heat compared with a Schottky diode. Programmable soft-start controls inrush current during hot-plug events, while overvoltage, over-temperature, and short-circuit protection guard the downstream load. An enable input allows the device to disconnect the load entirely. Architecturally, the RT1985 senses forward voltage across its internal MOSFETs and regulates the gate drive to emulate a diode in the forward direction, then opens the back-to-back FETs on detecting reverse current or fault conditions such as overvoltage or short circuit. The 28V absolute maximum rating provides transient headroom above the 23V operating ceiling, valuable on USB-C and other consumer DC inputs exposed to surges. The 3.4V to 23V operating range and 8A continuous rating make the RT1985 well suited for multi-port USB-C sink current applications, notebook and tablet power-path management, diode-OR sharing of adapters and batteries, and hot-swap protection of 5V-to-20V DC rails. According to Richtek, operation is specified over a -40°C to +125°C junction temperature range. When designing with this part, budget the conduction loss as I² x R (for example, 8A through 20mΩ dissipates roughly 1.3W) and provide adequate PCB copper on the VDFN-12TL thermal pads. Verify that the programmable soft-start setting limits inrush within the source adapter's capability. This page synthesizes distributor listings, manufacturer datasheet content, drop-in alternative analysis, and practical design notes not found in the datasheet alone.
RT6150BGQW - 0.8A Buck-Boost DC/DC Converter | Richtek
The Richtek RT6150BGQW is a high-efficiency, fixed-frequency current-mode Buck-Boost DC/DC switching regulator delivering up to 800 mA of output current in a 10-pin WDFN (GQW) exposed-pad package. It operates from input voltages above, below, or equal to the output voltage with an adjustable output starting at 1.8 V, providing a continuous transfer function through all operating modes including buck, boost, and buck-boost regions. A buck-boost converter is a switched-mode power supply topology that maintains a stable output voltage even when the input voltage crosses the regulated output level. Unlike pure buck or pure boost converters, the buck-boost can both step down (VIN > VOUT) and step up (VIN < VOUT) within the same power stage, making it ideal for battery-powered systems where the cell voltage starts above and ends below the load rail. The RT6150 belongs to the broader switching regulator family within power management ICs, sitting alongside buck, boost, and SEPIC converters. Key features include a 1 MHz switching frequency that enables the use of small external inductors and ceramic capacitors, a low 60 µA quiescent current in Power Save Mode (PSM) for extended battery life, and user-controlled PSM activation via the PS pin. The device integrates two N-MOSFET and two P-MOSFET switches, eliminating the need for external FETs. Protection features include cycle-by-cycle current limit, thermal shutdown, and soft-start. Architecturally, the RT6150 uses a current-mode control scheme that provides excellent line and load transient response while simplifying compensation. The 1 MHz fixed frequency enables predictable EMI behavior and the use of small magnetics, while the integrated 4-switch bridge provides seamless transitions between operating modes without output voltage discontinuity. Typical applications include single-cell lithium-ion battery powered devices, multi-cell alkaline or Ni-MH systems, portable industrial instruments, USB-powered peripherals, and IoT sensor nodes. The buck-boost topology is particularly valuable when the battery voltage range spans the load rail - for example, a single Li-ion cell (3.0 V to 4.2 V) powering a 3.3 V rail. Designers should evaluate inductor ripple current, output capacitor ESR, and PSM/PWM mode trade-offs. In PWM mode (PS pin high), the regulator operates at fixed 1 MHz for low-ripple performance; in PSM mode (PS pin low), it skips pulses at light load to maximize efficiency. Adequate thermal copper under the exposed pad is essential for full 0.8 A operation. This page synthesizes distributor pricing, parametric drop-in alternatives, and practical buck-boost design notes that complement the manufacturer datasheet.
RT8071AZQW - 3A 2MHz Synchronous Step-Down Converter | Richtek
The Richtek RT8071AZQW is a 3A, 2 MHz synchronous step-down DC-DC converter housed in a 10-pin DFN-10-EP (3x3 mm) package with an exposed thermal pad. It operates from a 2.7V to 5.5V input voltage range and delivers an adjustable output voltage from 0.6V up to VIN, making it well suited for point-of-load regulation in space-constrained designs. Internal MOSFETs (P-channel high-side and N-channel low-side) eliminate the need for external switches, and the 2 MHz nominal switching frequency permits the use of small surface-mount inductors and ceramic output capacitors. A synchronous step-down (buck) converter is a type of DC-DC switching regulator that steps a higher DC input voltage down to a lower regulated DC output voltage. Buck converters belong to the broader family of switch-mode power supplies (SMPS), which sit above linear regulators in efficiency but require an inductor, output capacitor, and feedback compensation. Within the SMPS hierarchy, the RT8071AZQW is positioned as a small-footprint, high-frequency point-of-load converter that targets portable, handheld, and embedded designs where PCB real estate is at a premium. Key features include a typical peak current limit of approximately 4 A for robust transient handling, internal soft-start to limit inrush current, power-good indication for sequencing, and a typical quiescent current on the order of tens of microamperes to maximize light-load efficiency. The exposed thermal pad on the DFN-10 package provides a low thermal resistance path, allowing the device to deliver 3 A continuously without an external heatsink when the PCB copper area is properly sized. The RT8071AZQW uses voltage-mode PWM control with internal compensation, which simplifies the external BOM to an input capacitor, an inductor, an output capacitor, and two feedback resistors. The 2 MHz switching frequency keeps the converter above the AM broadcast band, avoiding audible interference in audio-adjacent designs. Internal synchronous rectification eliminates the external Schottky diode required by older buck topologies, improving efficiency at light loads. Typical applications include portable media players, set-top boxes, blade servers, notebook computers, and distributed 5V POL rails in networking and storage equipment. The wide 2.7V-5.5V input range covers single-cell Li-ion, USB, and 3.3V/5V system bus rails, while the adjustable output supports DDR memory, FPGA core rails, and I/O supplies. When designing with this part, keep the input ceramic capacitor within 2 mm of the VIN and GND pins, route the feedback trace away from the SW node, and provide at least four thermal vias under the exposed pad to keep junction temperature within ratings at full 3 A load. This page synthesizes distributor pricing, drop-in same-family alternatives, and practical PCB layout notes that go beyond the manufacturer datasheet, enabling faster design-in and BOM decisions.
RT8077GQW - 2A, 2MHz Sync Step-Down Converter | Richtek
The Richtek RT8077GQW is a high-efficiency, 2 MHz synchronous step-down DC/DC converter that delivers up to 2 A of output current from a 2.6 V to 5.5 V input rail, packaged in an 8-pin WDFN (2x2 mm) with an exposed thermal pad. It provides an adjustable regulated output from 0.8 V to 5 V, an internal synchronous power stage that eliminates the need for an external Schottky diode, and a switching frequency programmable up to 2 MHz via an external resistor. The 100% maximum duty cycle allows low-dropout operation, which extends runtime in battery-powered portable systems where headroom shrinks as the cell discharges. A synchronous buck converter (also called a step-down switching regulator) is a switched-mode power supply topology that converts a higher DC input voltage to a lower DC output voltage using two MOSFET switches, an inductor, and output capacitance. Compared to linear regulators, buck converters achieve 90-95% efficiency at moderate load currents because they cycle energy through an inductor rather than dissipating it as heat. Synchronous buck converters replace the conventional rectifier diode with a low-Rdson MOSFET to further reduce conduction loss. Within the power management IC hierarchy, this places the RT8077GQW in the DC-DC converter family, which sits above simple LDO regulators and below system PMICs in terms of integration and complexity. Key features include 2 A continuous output current, a programmable switching frequency up to 2 MHz (which keeps the inductor and capacitors very small), 100% duty-cycle low-dropout operation, internal soft-start, cycle-by-cycle current limit, and thermal shutdown. The exposed-pad WDFN-8 package provides a low thermal resistance path, enabling 2 A delivery without an external heatsink in typical 3.3 V to 1.8 V or 3.3 V to 1.2 V point-of-load applications. The RT8077GQW uses a peak current-mode control architecture with internal compensation, which simplifies the external BOM to a minimum of five components: input capacitor, output capacitor, inductor, feedback resistor divider, and frequency-setting resistor. The high 2 MHz switching frequency minimizes output ripple and allows the use of a small 1 µH to 2.2 µH chip inductor, which is essential in space-constrained portable and wearable designs. Typical applications include single-cell Li-ion powered portable devices, USB-powered peripherals, set-top box and HDTV point-of-load rails, solid-state drive (SSD) power, and FPGA/CPU core voltage generation in 5 V input systems. The wide 2.6 V to 5.5 V input covers both USB 5 V and single-cell Li-ion (3.0 V to 4.2 V) rails directly without a pre-regulator. When designing with this part, select the inductor based on the chosen switching frequency and ripple target - typically 1 µH to 2.2 µH at 2 MHz with less than 30% peak-to-peak inductor current ripple. Place the input ceramic capacitor as close as possible to the PGND and VIN pins to minimize switching-node ringing. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
RT8299AZSP - 3A, 24V Synchronous Step-Down Converter | Richtek
The Richtek RT8299AZSP is a 3 A continuous-output, 24 V synchronous step-down DC/DC converter with internal power MOSFETs, packaged in an 8-pin SOP with exposed pad (SOP-8EP). It operates from a 3 V to 24 V input range, delivers an adjustable 0.8 V to 15 V output, and switches at a fixed 500 kHz, balancing small external magnetics with respectable transient response. Current-mode control with cycle-by-cycle current limit is used for short-circuit protection and loop stability. What is a synchronous step-down converter? A synchronous buck regulator is a type of switched-mode power supply (SMPS) that uses both a high-side and a low-side MOSFET (often integrated) to convert a higher DC input voltage to a lower DC output voltage. Compared to an asynchronous buck (with a freewheeling diode), a synchronous buck replaces the diode with a MOSFET, which dramatically reduces conduction loss, raises efficiency (typically 90%+), and eliminates the rectifier reverse-recovery loss. Within the broader taxonomy, a buck converter is a DC/DC converter, which is a sub-category of voltage regulator, itself part of power management ICs. The RT8299 family is targeted at distributed point-of-load (POL) rails where high efficiency at moderate current is required. Key specifications include the 3 V-24 V input range, 0.8 V-15 V adjustable output, 3 A continuous load, fixed 500 kHz switching frequency, internal high-side and low-side MOSFETs, and SOP-8EP package with an exposed thermal pad for improved heat spreading. Current-mode control eases loop compensation, while internal soft-start reduces inrush current at power-up. Architecturally, the RT8299 integrates a high-side N-MOSFET, a low-side N-MOSFET, a 0.8 V reference, an error amplifier, a PWM controller, and protection circuitry (OCP, OVP, UVLO, thermal shutdown) into one die. The exposed pad on the SOP-8EP package reduces thermal resistance to roughly 40 C/W (per the manufacturer datasheet thermal table), enabling full 3 A output at elevated ambient temperatures with proper board layout. Typical applications include 12 V bus to 3.3 V/5 V point-of-load conversion for industrial controllers, consumer electronics (set-top boxes, LCD TVs), USB Type-C powered devices, distributed POL supplies in networking equipment, and battery-powered systems running from 2- to 4-cell Li-ion packs (8.4 V-16.8 V nominal). At light loads the device still operates in forced-PWM, so efficiency is moderate at very low currents. When designing with the RT8299AZSP, choose an inductor with low DCR (typically 2.2 µH to 4.7 µH), use ceramic input and output capacitors rated for the switching ripple current, and keep the high-current loop (IN-SW-PGND) tight on the PCB. Ensure the exposed pad is soldered to a copper area of at least 1 sq inch for the full 3 A continuous rating. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design guidance not found in the manufacturer datasheet.
RT8462GS - High-Voltage LED Driver Controller | Richtek | Buck/Boost
The Richtek RT8462GS is a high-voltage, high-current LED driver controller built on a current-mode PWM architecture that drives an external MOSFET for high-power LED applications. The device integrates a 36 V rated input section with an output stage capable of 60 V, supports step-down (Buck), step-up (Boost), and step-down/step-up (Buck-Boost) topologies from a single 14-SOP package, and provides analog plus PWM dimming capability. Operating at a fixed switching frequency up to 1 MHz, the RT8462GS gives designers flexibility to optimize the inductor and EMI filter while still meeting tight current regulation across the load range. An LED driver controller is a power management integrated circuit (PMIC) that regulates the current flowing through a string of high-brightness LEDs. It belongs to the broader hierarchy of LED drivers -> power management IC -> power management -> semiconductor. Unlike a fixed-voltage regulator that targets a DC rail, an LED driver maintains constant current so that LED brightness and color temperature stay consistent regardless of supply variation, temperature drift, or forward-voltage bin spread. Key features of the RT8462GS include a low-side current sense amplifier with programmable threshold, an internal soft-start to limit inrush current, under-voltage lockout (UVLO), over-current protection (OCP), and over-temperature protection (OTP). The analog dimming input accepts a 0 to 1.2 V DC signal and the PWM dimming input accepts a TTL-level duty cycle from 100 Hz to 20 kHz, both supporting high-contrast dimming ratios needed for display backlight and architectural lighting. The RT8462GS uses peak current-mode control with a transconductance error amplifier referenced to an internal bandgap. The high-side gate driver output swings to the BST pin voltage, allowing use with logic-level N-channel MOSFETs. This topology provides simple loop compensation with a single Type-II network and inherent cycle-by-cycle current limiting. Typical applications include LCD monitor and TV LED backlight drivers, automotive interior and exterior lighting, architectural and stage lighting fixtures, and high-power portable lighting where efficiency and dimming flexibility matter. When designing with the RT8462GS, choose the external MOSFET and inductor to match the LED string current and switching frequency; ensure the BST capacitor and gate-drive resistor are sized per the manufacturer's typical application circuit. Provide adequate PCB copper for the power-stage ground return and route the current-sense traces as a Kelvin connection to avoid ground bounce. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet summary.
RT8475GS - 36V 350kHz LED Driver PWM Controller | Richtek
The Richtek RT8475GS is a current-mode PWM controller IC designed to drive an external MOSFET for high-current LED applications, housed in a 14-pin SOP (Small-Outline Package). With a current-sense amplifier threshold of 190 mV and a maximum operating input voltage of 36 V, the device supports output voltages up to 90 V, making it ideal for buck, boost, and buck-boost topologies in lighting and backlight designs. Typical switching frequency is 350 kHz, with an analog and PWM dimming control interface for brightness adjustment. An LED driver controller is a specialized power management IC that regulates the brightness of solid-state light sources by controlling the current flowing through one or more LEDs. Unlike simple resistor-based current limiters, an LED driver maintains constant current regardless of input voltage variation, temperature drift, or forward-voltage spread between LED batches. The RT8475GS falls into the PWM-controller sub-category of LED drivers (LED driver controller -> LED driver -> power management IC -> semiconductor), where it generates a PWM gate-drive signal for an external switching MOSFET rather than integrating the switch itself - giving designers freedom to choose MOSFET RDS(on), package, and thermal performance for high-power strings. Key features of the RT8475GS include analog and PWM dimming capability, a 350 kHz typical switching frequency that balances magnetics size against switching loss, and an enable/soft-start pin for controlled startup. The 190 mV low-side current-sense threshold minimizes losses on the sense resistor while preserving regulation, and the wide VIN range (4.5 V to 36 V) accommodates both 5 V/12 V bus systems and 24 V industrial rails. Analog dimming is supported via a linear DIM input, while PWM dimming accepts an external logic signal for high-contrast dimming ratios exceeding 1000:1. The RT8475GS uses a peak-current-mode control architecture with internal slope compensation, providing good line rejection, simple loop compensation, and cycle-by-cycle current limiting. The external MOSFET topology means designers can scale LED current simply by selecting a lower-inductance sense resistor (RSNS = 190 mV / ILED) - a critical advantage over integrated-switch LED drivers when currents exceed 1 A or when thermal budgets require spreading heat across the PCB rather than concentrating it inside the IC. Typical applications include high-brightness LED backlighting for LCD panels, architectural and stage lighting, automotive interior/exterior lighting, signage illumination, and DC/DC LED drivers in industrial machine-vision systems. The wide VIN range also suits portable lighting and battery-powered torches when paired with a boost topology. When designing with this controller, select the external MOSFET and inductor based on peak LED current, switching frequency (350 kHz), and maximum VIN. The sense resistor must be a low-inductance, low-drift type (1% tolerance or better), and the loop bandwidth should remain well below the switching frequency to avoid subharmonic oscillation when operating above 50% duty cycle. This page synthesizes distributor pricing, drop-in pin-compatible alternatives from the same Richtek controller family, and practical design notes not found in the manufacturer datasheet.
RT8475ZS - 350kHz LED Driver Buck/Boost Controller | Richtek
The Richtek RT8475ZS is a 350 kHz constant-current LED driver controller with one DC-DC output supporting both step-down (Buck) and step-up (Boost) topologies, housed in a 14-pin SOP (Small Outline Package) with 3.90 mm body width. The device integrates analog and PWM dimming interfaces, making it suitable for driving high-brightness LED strings from a wide range of input voltages. According to distributor catalog descriptions, it functions as a PMIC LED Driver IC 1-Output DC-DC Controller with analog/PWM dimming in a 14-SOP package. An LED driver controller is a power management IC that regulates current through one or more strings of LEDs, maintaining brightness uniformity and protecting the LEDs from overcurrent conditions. In the broader taxonomy, LED driver controllers belong to PMIC -> power management IC -> driver IC -> constant-current regulator -> semiconductor. By regulating current rather than voltage, these controllers compensate for variations in LED forward voltage (Vf), temperature drift, and aging, ensuring consistent lumen output across the operating range. Key features of the RT8475ZS include its 350 kHz switching frequency, which keeps the converter above the AM band and allows compact inductor selection, and its dual topology flexibility (Buck or Boost) that lets a single part handle both step-down and step-up LED strings. The controller supports both analog dimming and PWM dimming, allowing brightness control from either a DC level or a duty-cycle signal for high-contrast dimming down to sub-1% levels. The 14-SOP package provides adequate thermal dissipation in surface-mount designs and supports standard reflow profiles. The RT8475ZS uses Richtek's proprietary constant-current control architecture to regulate the high-side MOSFET switch current through an external sense resistor, achieving cycle-by-cycle current limiting. The 350 kHz oscillator is internally trimmed, eliminating the need for an external RT resistor, and the dual dimming inputs (ADIM and PDIM) interface easily to microcontrollers or analog reference voltages. A typical application circuit uses an N-channel MOSFET, a Schottky diode, an inductor, and a sense resistor to form a complete buck or boost LED driver capable of driving strings of 1 W to 5 W LEDs. Typical applications include LED backlight drivers for LCD panels, architectural and decorative LED lighting, automotive interior lighting, and signage or indicator illumination. The wide input voltage tolerance of the controller supports both 12 V and 24 V bus systems commonly found in these applications. The analog dimming input is particularly useful for closed-loop feedback designs where ambient light sensing adjusts the LED current automatically. When designing with the RT8475ZS, ensure that the external MOSFET, inductor, and sense resistor are chosen for the target LED string voltage and current. PCB layout should minimize the loop area of the power stage to reduce EMI and use a ground plane for stable operation. The PWM dimming frequency should be selected above 100 Hz to avoid visible flicker in lighting applications. This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical design notes for the RT8475ZS, providing engineering guidance that goes beyond the standard distributor product listing.
RT9161-33PX - 300mA 3.3V LDO Regulator | Richtek | SOT-89
The Richtek RT9161-33PX is a fixed 3.3V output, 300mA low-dropout (LDO) linear voltage regulator housed in a SOT-89 surface-mount package. It belongs to the RT9161/A series of CMOS LDOs that deliver low quiescent current (typically 110 µA from zero to full load) and tight output accuracy (±2% on the 3.3V option), making it suitable for portable, battery-powered, and embedded applications where efficiency and board real-estate matter. An LDO (low-dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage. LDOs sit within the broader category hierarchy of linear regulators -> voltage regulators -> power management ICs -> semiconductors. Unlike switching regulators, an LDO introduces no switching noise onto the output rail but dissipates the difference between input and output as heat. Key features of the RT9161-33PX include a fixed 3.3V output with ±2% tolerance, 300mA continuous output current, built-in current-limit protection, thermal shutdown, and a low quiescent ground current of approximately 110 µA across the entire load range. The SOT-89 package provides an exposed die attach pad (lead frame tab) that enables reasonable power dissipation for the 300mA load class with modest copper area on the PCB. Architecturally, the RT9161-33PX is built around a CMOS pass-element topology with an internal bandgap reference and error amplifier, providing fast transient response and stable operation with low-ESR ceramic capacitors. The low dropout voltage - typically around 250 mV at full 300 mA load - allows the regulator to maintain regulation directly from a single-cell Li-ion source as it discharges. Typical applications include single-cell Li-ion powered systems, USB peripherals, microcontroller core rails, real-time-clock (RTC) backup supplies, and post-regulation stages following switching converters. Its low quiescent current makes it especially attractive for always-on power domains in IoT endpoints and wearable devices where standby drain directly governs battery life. When designing with the RT9161-33PX, observe the input/output voltage headroom for dropout, ensure the input capacitor is placed within a few millimetres of the IN pin to control input impedance, and follow SOT-89 thermal layout guidance - a small copper pour tied to the tab acts as the heatsink. This page synthesizes distributor pricing, verified drop-in alternatives in the same SOT-89 footprint, and practical design notes not consolidated in the manufacturer datasheet - useful information gain for engineers shortlisting 3.3V LDO candidates.
RT9478M - 24V 4-Switch NVDC Buck-Boost Charger | Richtek
The Richtek RT9478M is a 4-switch bidirectional buck-boost Narrow Voltage DC (NVDC) battery charge controller for 2- to 4-cell Li-ion battery packs, accepting a wide 3.8V to 24V input range and packaged in a thermally enhanced QFN package. It integrates power-path MOSFET drivers and supports USB-C Power Delivery (PD) sources, conventional AC-DC adapters, and mobile battery inputs. The device delivers up to 5A charging current and integrates a 5V NMOSFET gate driver plus an 8-bit ADC for accurate telemetry and system monitoring. A buck-boost charge controller is a switching power-supply topology that can step the input voltage either up or down to match the battery voltage, enabling seamless charging from sources whose voltage may lie above, below, or equal to the battery stack voltage. NVDC (Narrow Voltage DC) specifically refers to power-path architecture in which the system rail is held slightly above the battery voltage via a buck converter, allowing the system to operate directly from the adapter when present and seamlessly transition to battery power when unplugged. The RT9478M belongs to the Battery Management -> Multi-Cell Switching Charger family, a hypernym hierarchy of charger IC -> power management IC -> semiconductor. Key differentiating features include nine operating modes - Low Power, Performance, Active VBUS, Charging, Supplement, OTG, VAP, HiZ, and Learn - giving the system designer fine-grained control over system power states. Integrated protections include over-voltage, under-voltage, over-current, thermal shutdown, and battery temperature sensing through an external thermistor interface. The OTG (On-The-Go) mode allows the battery pack to source 5V back to a USB-C port for powering external devices, supporting modern USB-PD DRP (Dual Role Port) applications. Architecturally, the RT9478M uses a 4-switch H-bridge buck-boost topology with peak-current-mode control and adaptive dead-time insertion, achieving high efficiency across the entire input voltage range. The internal state machine coordinates the bidirectional power flow between adapter, system rail, and battery, while the integrated ADC monitors voltage, current, and temperature for both telemetry and protection. Compared to discrete solutions, the RT9478M dramatically reduces BOM count by integrating drivers, switches coordination logic, and the protection/monitoring ADC. Typical applications include USB-C PD charging for 2-4S notebook computers, power banks, portable medical equipment, industrial tablets, and drone battery stations. The wide input range makes it compatible with USB-PD 5V/9V/15V/20V profiles without requiring a separate front-end regulator. The bidirectional OTG capability also enables the same pack to power USB-PD powered accessories. When designing with the RT9478M, careful attention must be paid to inductor selection and input/output capacitor sizing to maintain stability across the buck and boost operating regions. The thermal pad must be soldered to a sufficiently large copper pour on the PCB, as the device dissipates significant power during boost-mode operation at high VIN. Designers should consult the Richtek reference design for recommended external component values. This page synthesizes the official datasheet, parametric cross-reference data, and practical design guidance for the RT9478M, providing context beyond what the manufacturer datasheet alone offers for engineers evaluating this part for a multi-cell USB-C PD application.
RT9711CGB - 80mΩ, 600mA USB High-Side Power Switch | Richtek
The Richtek RT9711CGB is a 1.5A/0.6A-rated, 80mΩ single N-MOSFET high-side power switch with FLAG output, packaged in a 5-pin SOT-23 (GB) outline. It is optimized for self-powered and bus-powered Universal Serial Bus (USB) applications and integrates a charge pump to fully enhance the internal N-channel MOSFET, providing a true 80mΩ on-resistance that meets USB voltage-drop budget requirements. A high-side power switch (also called a load switch or power distribution switch) is a semiconductor that sits between a system rail and a downstream load, providing controlled turn-on, fault protection, and isolation. In USB applications, these switches implement per-port current limiting and over-current protection, sitting above the system hierarchy as a sub-class of power management ICs (PMIC) and ultimately belonging to the broader semiconductor / integrated circuit family. The RT9711CGB features 1.5A continuous / 0.6A continuous current ratings depending on operating conditions, low quiescent current, over-current protection, over-temperature shutdown, under-voltage lockout, and an open-drain FLAG signal that asserts when a fault occurs. The low RDS(ON) of 80mΩ minimizes voltage drop and conduction loss on the VBUS rail, while the FLAG output simplifies fault reporting back to the USB host controller or system MCU. Typical applications include USB downstream ports, USB hubs, self-powered and bus-powered USB peripherals, hot-plug power rails, and any system requiring controlled load switching with fault indication. The SOT-23-5 footprint is one of the smallest USB switch packages available, enabling high port density on hub PCBs. When designing with the RT9711CGB, place input and output bypass capacitors as close to the IC as possible to suppress transient ringing during turn-on. The FLAG pin requires a pull-up resistor; an RC delay network can be added to debounce transient faults. Always observe the datasheet's SOA curve when sizing upstream protection. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
RT9718 - 30V Overvoltage Protection IC | Richtek
The Richtek RT9718 is an overvoltage protection IC designed to safeguard low-voltage systems from abnormal high input voltages up to 30V. Housed in a compact 8-pin WDFN (2x2 mm) package, the device integrates input voltage monitoring, battery voltage sensing, and charging current supervision into a single die, making it a space-efficient solution for single-cell lithium-ion battery protection circuits. An overvoltage protection IC is a battery management semiconductor that disconnects the load or charging path when the input or battery voltage exceeds a preset safe threshold, preventing damage to downstream components and the cell itself. Overvoltage protection ICs sit beneath supervisors and reset ICs in the power management hierarchy, and above discrete Zener-diode clamping solutions, delivering higher accuracy and programmable thresholds. Key specifications of the RT9718 include a wide input voltage range up to 30V maximum, internal overvoltage threshold detection, low quiescent current consumption, and integrated MOSFET control for high-side switching. The IC operates from typical 1-cell Li-ion/Li-poly battery voltages (nominally 3.0V to 4.4V) while tolerating abnormal charger insertion up to 30V without damage. The RT9718 uses a precision bandgap reference and comparator architecture to detect overvoltage conditions with millivolt-level accuracy. According to the manufacturer datasheet DS9718-05, the device latches off the internal pass element when the input voltage exceeds the programmed threshold, protecting downstream USB controllers, PMICs, and battery cells. The integrated current-sense path also monitors charging current against an externally programmable limit. Typical applications include single-cell Li-ion battery packs, USB charger front-end protection, mobile phone power-path management, handheld portable devices, and any 1S battery-powered system exposed to faulty or non-compliant adapters. The device is widely used as a discrete replacement for protection FETs combined with a separate supervisor IC. When designing with the RT9718, observe the absolute maximum input voltage of 30V and select external sense resistors to set the desired overvoltage and overcurrent trip thresholds. Place input decoupling capacitors as close to the IN pin as possible to suppress transient events. This page synthesizes distributor pricing, drop-in package-compatible alternatives, application circuit guidance, and detailed design notes that complement the Richtek datasheet for engineers evaluating the RT9718 for new designs or as a second-source part.
RTQ2183-QA - 3A 5.5V Automotive Sync Buck Converter | Richtek
The Richtek RTQ2183-QA is a 3 A automotive-grade synchronous buck converter operating from 2.5 V to 5.5 V input and producing an adjustable output from 0.6 V to 3.3 V, housed in a compact WET-VDFN-8J2L 2x1.5 (FC) package. According to the Richtek datasheet, the device integrates 65 mΩ high-side and 35 mΩ low-side power MOSFETs, switching at a nominal 2.4 MHz to minimize external inductor and capacitor size while keeping fundamental and harmonic noise out of sensitive AM-radio bands. A synchronous buck (step-down) converter is a switching DC-DC topology that uses a high-side MOSFET, a low-side synchronous rectifier, an LC output filter, and a control loop to deliver a lower regulated voltage from a higher input rail with high efficiency. Synchronous designs replace the traditional Schottky rectifier with a low-RDS(on) MOSFET to reduce conduction losses, and the RTQ2183-QA integrates both FETs inside the package for the smallest possible footprint. ACOT® (Advanced Constant On-Time) is Richtek's proprietary control architecture that delivers fast transient response without requiring loop compensation, making the part well-suited to point-of-load applications where the load steps quickly. Key specifications include 3 A continuous output current, 2.5 V to 5.5 V input range, 0.6 V to 3.3 V adjustable output, 2.4 MHz nominal switching frequency, and integrated 65 mΩ/35 mΩ MOSFETs. Comprehensive protection is built in: input undervoltage-lockout (UVLO), output undervoltage protection (UVP), output overvoltage protection (OVP), overcurrent protection (OCP) with cycle-by-cycle current limit, and over-temperature protection (OTP). The part is AEC-Q100 qualified for automotive environments. The ACOT® control loop eliminates the external compensation network typically required by peak-current-mode or voltage-mode buck converters, simplifying PCB layout and reducing BOM count. The 2.4 MHz switching frequency enables a 1 µH inductor and small ceramic output capacitors, allowing a complete 3 A point-of-load solution under 25 mm². Soft-start is internally trimmed to limit inrush current during power-up, and the device supports 100% duty-cycle operation for low-dropout conditions at VIN close to VOUT. Typical applications include automotive infotainment systems, ADAS camera/sensor rails, body electronics, USB Type-C VBUS buck regulation, and industrial 5 V distributed-bus point-of-load converters. The wide VIN range also covers USB-PD source applications, portable instrumentation, and FPGA/CPU core rails powered from a single Li-ion cell. When designing with this device, place the input ceramic capacitor within 2 mm of the VIN and PGND pins to suppress switching-node ringing, and keep the feedback trace away from the SW node to avoid noise coupling. The exposed pad must be soldered to a continuous ground plane to meet the thermal rating at 3 A continuous load. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, providing engineers with verified guidance for automotive buck-converter selection and PCB implementation.
RTQ2533WGQV(2) - 3A Ultra-Low Noise LDO, 6.5V, VQFN-20 | Richtek
The Richtek RTQ2533WGQV(2) is a 3 A ultra-low-noise, ultra-low-dropout (LDO) linear regulator with a 1.1 V to 6.5 V input range and adjustable output up to 5.5 V, packaged in a 20-pin VQFN (3.5 mm x 3.5 mm). It delivers 6.8 uVrms output noise at 0.8 V and 10 uVrms at 3.3 V, with 40 dB PSRR at 500 kHz and a maximum dropout of 180 mV at 3 A load. Output voltage is pin-selectable up to 3.95 V via PCB layout without external resistors, or up to 5.5 V using a resistive divider, with 1% accuracy over line, load, and temperature. An LDO (Low-Dropout) linear regulator is a type of linear voltage regulator that maintains a regulated output voltage even when the input-to-output differential approaches the minimum pass-element headroom. Within the broader product hierarchy, an LDO is a linear regulator is a voltage regulator is a power management IC. Because the pass element operates in the linear region (not switching), the LDO adds no high-frequency switching noise to the output - this is the defining advantage over switch-mode converters for noise-sensitive analog and RF rails. Key features of the RTQ2533WGQV(2) include pin-programmable output voltage that eliminates feedback resistors for the most common voltages (reducing BOM count and PCB area), an exposed thermal pad for high-current operation, internal soft-start to limit inrush current, and built-in protection including current limit and thermal shutdown. The combination of 3 A continuous load and 180 mV maximum dropout supports tight point-of-load regulation in systems where headroom is constrained. The regulator uses a PNP pass architecture with a precision bandgap reference and trimmed feedback network, achieving 1% output accuracy across the entire VIN/VOUT/load/temperature envelope. The exposed thermal pad on the VQFN-20 package provides a low thermal-resistance path (theta_JC substantially lower than theta_JA) for sustained 3 A operation without external heatsinking. Typical applications include FPGA and ASIC core/IO rail regulation, server and networking point-of-load supplies, audio codec and DAC power rails, RF transceiver local regulation, and industrial 5 V/3.3 V point-of-load conversion. The wide input range and 3 A output suit multi-rail systems where one input rail feeds several regulated outputs. When designing with this part, follow the manufacturer's PCB layout guidelines: place input and output capacitors as close as possible to the IC, use sufficient copper pour on the exposed thermal pad to keep junction temperature below 125 C, and select the output voltage via proper PCB routing as documented in the datasheet to avoid needing external resistors. This page synthesizes distributor pricing, drop-in Richtek same-family alternatives, and practical thermal/layout guidance not consolidated in the manufacturer datasheet alone, giving engineers a single source for selection and procurement decisions.
RTQ2811A - 17V/20A ACOT Buck Converter for Server POL | Richtek
The Richtek RTQ2811A is a 17V-tolerant, 20A synchronous step-down DC/DC converter built on Richtek's proprietary ACOT (Adaptive Constant On-Time) control architecture, housed in a compact QFN package with exposed thermal pad. It targets data-center server SSDs and high-density point-of-load (POL) power modules where high efficiency, fast transient response, and small PCB footprint are mandatory. The device supports an input voltage range that covers typical 12V bus rails and outputs programmable voltages well below 1V for ASIC/SoC core rails. A DC/DC buck converter (step-down switching regulator) is a type of switched-mode power supply (SMPS) that uses high-side and low-side MOSFET switches plus an LC output filter to convert a higher DC input voltage into a lower, regulated DC output voltage. Within the power management hierarchy, a buck converter sits under DC-DC converters, which sit under voltage regulators, which sit under power management ICs (PMICs), which sit under integrated circuits. The ACOT topology used in the RTQ2811A is a fast-transient variant of the constant on-time control family that minimizes output capacitance while maintaining tight DC regulation. Key differentiating features include ACOT control for sub-microsecond transient response, integrated high-side and low-side MOSFETs supporting up to 20A continuous output current, programmable switching frequency, internal compensation, and integrated protection features including OCP, OVP, UVP, and thermal shutdown. The exposed-pad QFN package keeps thermal resistance low for sustained high-current operation in confined server environments. According to the manufacturer application note AN094, the RTQ2811A is specifically designed for next-generation AI server SSDs and POL power modules. Typical applications include server/datacenter SSD power, AI accelerator cards, point-of-load modules for ASICs, FPGA core rails, networking switch ASICs, and high-current PoL converters for telecom boards. When designing, prioritize input capacitor placement adjacent to the high-side MOSFET return path and use a sufficient copper pour on the exposed pad to keep junction rise within safe limits at 20A load.
RTQ6060 - 36V Bidirectional Zero-Drift Current Monitor | Richtek
The Richtek RTQ6060 is a high-precision, bidirectional, zero-drift current monitor designed for accurate current sensing in current-reporting and system-optimization circuits. It operates over a wide common-mode voltage range of -0.3V to 36V and senses a low voltage drop of 10mV across an external shunt resistor, providing analog output that scales linearly with load current. A zero-drift current monitor is a precision analog current-sense amplifier that uses continuous auto-zeroing or chopper techniques to minimize input offset voltage and offset drift over time and temperature. This category sits within the broader hierarchy of current-sense amplifiers -> analog signal conditioning -> amplifiers -> power management ICs. Compared with traditional shunt monitors that require a 100mV full-scale drop for adequate accuracy, zero-drift topologies such as the RTQ6060 achieve comparable performance with a much smaller 10mV full-scale, dramatically reducing power dissipation in the sense resistor. Key specifications of the RTQ6060 series include an extremely low input offset voltage, near-zero offset drift, a fixed gain (variant-dependent), and an SC-70-6 surface-mount package measuring only 2.0mm x 1.25mm. The bidirectional variants (suffix A and B) support both charge and discharge monitoring, making them well suited to battery-powered systems. The combination of wide common-mode range, low sense voltage, and miniature package supports integration into high-density power-conversion, battery-management, and motor-control designs. Architecturally, the RTQ6060 uses an internal auto-zeroing chopper-stabilized input stage combined with a precision gain block and output buffer. This topology cancels the 1/f noise and offset drift that would otherwise dominate low-side measurements, while the output stage is designed to drive ADC inputs, microcontroller GPIO, or analog comparator inputs directly. Typical applications include battery fuel-gauging in portable electronics, current-sharing monitoring in multi-rail power supplies, motor stall detection in DC fan and pump drives, and over-current protection in hot-swap controllers. For telecom 48V rails, the 36V common-mode rating (with proper derating) covers the negative transients encountered during load steps. Designers should choose the sense-resistor value carefully to balance full-scale voltage (10mV typical) against ADC dynamic range, and place the sense resistor close to the shunt input pins to minimize ground-loop errors.
S-13A1A10-U5T1U3 - 1A Low Iq LDO, 1V Fixed | ABLIC
The ABLIC S-13A1A10-U5T1U3 is a 1A low-dropout CMOS linear voltage regulator with 1.0 V fixed output, housed in a 5-pin SOT-89-5 (HSOP-6 equivalent) surface-mount package. It combines high ripple rejection, low dropout voltage, and ultra-low quiescent current for energy-sensitive single-cell Li-ion and multi-cell alkaline power systems. The device is part of the ABLIC S-13A1 Series, designed using CMOS technology and qualified for portable and industrial applications. An LDO (low-dropout) linear regulator is a type of linear voltage regulator that can maintain a regulated output voltage even when the input voltage approaches the output voltage within a few hundred millivolts. Within the broader hierarchy, an LDO is a subtype of linear regulator, which itself belongs to the voltage regulator family inside the power management IC category. LDOs are preferred over switching regulators in noise-sensitive analog and RF rails because they introduce no switching ripple, at the cost of lower efficiency at large input-to-output voltage differentials. Key specifications include a 5.5 V maximum input voltage, 1 A continuous output current, low quiescent current rated in the low-microamp range for the A1 sub-family, and built-in protections for thermal shutdown, overcurrent limiting, and short-circuit protection. The S-13A1A10-U5T1U3 ships with a fixed 1.0 V output, eliminating external resistor dividers and reducing PCB footprint. Output accuracy is specified at plus or minus 1.5 percent typical, sufficient for digital logic rails and low-voltage ASIC cores. The device uses a CMOS pass element that achieves low dropout and low ground-pin current simultaneously, an advantage over older bipolar LDOs that drew higher quiescent current at full load. The internal reference and feedback network are trimmed during production, providing stable output across the -40C to +85C operating range. The exposed tab on the SOT-89-5 package provides a low thermal resistance path to PCB copper, enabling 1 A delivery without an external heatsink when the layout includes adequate copper area. Typical applications include single-cell Li-ion powered portable devices, microcontroller core rails, sensor and module supplies, USB-powered peripherals, point-of-load regulation after a switching converter, and standby rails in white goods. The 1.0 V fixed variant is commonly paired with 1.2 V or 1.8 V variants of the same family when multiple low-voltage rails are required. When designing with this part, ensure input and output ceramic capacitors placed within 2-3 mm of the device pins, use the exposed thermal pad as the primary heat-dissipation path, and respect the absolute maximum input voltage of 6.5 V (recommended 5.5 V operating maximum). For higher output voltages, select the corresponding fixed-voltage variant from the S-13A1 Series rather than attempting resistor programming on a fixed-output MPN. This page synthesizes distributor pricing, drop-in same-family alternatives, and practical layout guidance not consolidated on any single manufacturer or distributor page.
S-13R1B33-A4T2U3 - 3.3V 150mA CMOS LDO | ABLIC | HSNT-4-B
The ABLIC S-13R1B33-A4T2U3 is a positive fixed-voltage CMOS low-dropout (LDO) linear regulator that delivers up to 150 mA of output current at a fixed 3.3 V output, integrated in a 4-pin HSNT-4-B surface-mount package with an exposed thermal pad. Designed using CMOS process technology, the part provides low dropout voltage, high output voltage accuracy, and low current consumption while integrating reverse-current protection to safeguard downstream circuitry from back-feeding through the regulator. The -A4T2U3 suffix denotes fixed 3.3 V output, the A4 package code (HSNT-4-B, 4-pin, flat-lead with exposed pad), T2 tape-and-reel orientation, and U3 production-grade temperature designation. An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable DC output voltage even when the input-to-output differential is very small, often just a few hundred millivolts. LDOs belong to the broader linear regulator family, which sits alongside switching regulators inside the voltage regulator category of power management ICs. Unlike switching regulators that use energy-storage magnetics and switching pulses, an LDO dissipates excess input voltage as heat, which trades efficiency for exceptionally low output noise and high power-supply rejection ratio (PSRR). Key features of the S-13R1B33-A4T2U3 include 150 mA continuous output current, fixed 3.3 V output with high accuracy, low quiescent current consumption, and integrated reverse-current protection that prevents current flow from the output back into the input when VIN collapses. The CMOS process enables small package footprint and low standby power, while the HSNT-4-B exposed thermal pad keeps junction temperature in check at moderate ambient loads. The part is also available across the wider S-13R1 series with output voltages ranging from approximately 1.0 V to 3.6 V, all sharing the same HSNT-4-B footprint. Typical applications for the S-13R1B33-A4T2U3 include portable and battery-powered devices (sensor nodes, wearables, remote controls), IoT endpoints, low-power MCUs and BLE modules with 3.3 V rails, and as a post-filter stage after a switching DC-DC converter to deliver clean power to noise-sensitive analog blocks. The 3.3 V fixed output is especially useful for digital logic rails. When designing with this regulator, observe the maximum input voltage limit and verify that the input-output voltage differential at minimum VIN remains above the dropout specification at the worst-case 150 mA load. Place input and output ceramic bypass capacitors as close as possible to the device pins to ensure loop stability.