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ISL95833HRTZ - IMVP-7/VR12 Dual 2+1 PWM Controller | Renesas
The Renesas ISL95833HRTZ is a dual 2+1 PWM controller IC designed for IMVP-7/VR12 compliant microprocessor and graphics processor core voltage regulators, integrating two voltage regulator control loops plus one integrated driver in a 32-pin QFN-EP (4x4 mm) package. The device delivers a programmable output range of 0.25 V to 1.52 V supporting up to 60 A and uses Intersil's proprietary Robust Ripple Regulator (R3) modulation technology to deliver superior transient response and DC accuracy. An IMVP-7/VR12 PWM controller is a multiphase buck-control IC that converts a higher DC bus voltage (typically 19 V from an adapter or 12 V from a battery) into the sub-1.5 V core rail demanded by modern Intel CPUs. The ISL95833 sits in the broader hierarchy of multiphase controllers -> DC-DC controllers -> voltage regulators -> power management ICs -> semiconductors. Compared with simpler voltage-mode or single-phase controllers, R3-based multiphase devices trade higher pin/packaging complexity for vastly improved load-step response, lower ripple at the load, and the ability to scale current by adding phases. Key features include 2+1 phase architecture (one VR for V_CORE with integrated 2-phase driver, plus a second VR for graphics/system agent), ±0.5 % system accuracy, automatic phase shedding at light load, and full IMVP-7/VR12 protocol compliance including PVID, SVID, and power-state transition support. The on-chip high-side and low-side gate drivers reduce external MOSFET count, while differential voltage sensing and per-phase current balancing improve regulation accuracy under dynamic loads. The architecture combines a high-bandwidth error amplifier, a precision internal reference, programmable dead-time control, and per-phase current sharing. The 32-pin QFN exposed-pad package provides a low thermal resistance path (theta_JA approximately 36 C) for thermal management of the integrated drivers, and an I2C/SMBus interface enables telemetry, fault logging, and configuration. Typical applications include IMVP-7/VR12 notebook CPU core rails, ultrabook and Ultrabook-class platforms, gaming laptop GPU rails, and embedded computing modules with VR12-compatible processors. The wide input range (typically 4.5 V to 25 V) supports 2-cell/3-cell Li-ion battery systems plus adapter boosting, and the integrated driver topology is favored where PCB area is constrained and BOM count must be minimized. When designing with the ISL95833HRTZ, place the input sense resistor and phase inductors within 10 mm of the controller to minimize parasitic ESL, and connect the exposed pad to a continuous ground copper pour for thermal dissipation. Verify the IMVP-7/VR12 protocol timing budget against your platform's VR12.5 extension requirements, since the ISL95833 does not natively support VR12.5/VR13 voltages above 1.52 V. This page synthesizes distributor pricing, application-specific design notes, and drop-in compatibility data sourced from the manufacturer datasheet and authorized distributors - information not consolidated on any single distributor product page.
ISL95833HRTZ-T - Dual 2+1 PWM Controller IMVP-7/VR12 | Renesas
The Renesas ISL95833HRTZ-T is a dual 2+1 pulse-width modulation (PWM) controller designed for IMVP-7/VR12 compliant microprocessor and graphics-processor core voltage regulators, housed in a 32-pin QFN-EP (4x4 mm) package. It integrates two voltage regulators with output capability up to 60 A and an output voltage range of 0.25 V to 1.52 V, suiting it for high-current CPU Vcore and GPU core power rails in notebook platforms. The first VR (typically Vcore) incorporates 1 integrated driver and can operate in 2- or 1-phase configurations, while the second VR handles graphics-processor or system-agent power. A PWM controller is a switch-mode power-supply control IC that regulates an output voltage by varying the duty cycle of a switching stage. IMVP-7 (Intel Mobile Voltage Positioning) and VR12 are Intel-defined voltage-regulator specifications that combine a multi-phase buck topology, dynamic VID, current balancing, and protection telemetry to power modern x86 processors. The ISL95833 sits between the IMVP-7/VR12 controller hierarchy and the discrete power stage, providing the analog control loops and digital telemetry that the CPU expects. Key features of the ISL95833HRTZ-T include dual independent current-mode PWM modulators, integrated MOSFET drivers, differential voltage error amplifier, programmable dynamic VID, droop and offset compensation, per-phase current balance, and comprehensive protection (OVP, UVP, OCP, OTP). The current-mode architecture provides line-transient rejection and per-cycle current limiting, while the integrated driver eliminates external gate-driver ICs for Vcore, reducing BOM and PCB area in thin notebook designs. Typical applications include Intel IMVP-7/VR12 notebook Vcore rails, integrated graphics (iGPU) regulators, system-agent rails, and embedded computing platforms requiring IMVP-7-compliant multiphase buck control. The 32-pin QFN-EP package exposes a thermal pad for direct copper heatsinking to keep junction temperatures within limits under sustained 60 A output conditions. When designing with this controller, follow the datasheet IMVP-7/VR12 reference schematic, including the recommended inductor, MOSFET pair, and sense-resistor selection to meet Intel transient and DC tolerance windows.
ISL99125B - 25A DrMOS Power Module | Renesas
The Renesas ISL99125B is a 25A DrMOS power module with integrated high-side and low-side MOSFETs, a high-performance FET driver, and diode emulation in a 24-QFN package measuring 3.5 mm by 5 mm. It is designed for high-frequency, high-density DC/DC power conversion, combining a power stage and driver in one package to reduce external component count and simplify converter layout. The verified listing identifies the device as an ISL99125B 25A/35A DrMOS family device and describes it as suitable for high-frequency power conversion. A DrMOS module is an intelligent power semiconductor stage that combines a MOSFET power stage with its driver. In a synchronous buck or similar converter, the module switches the input rail into a controlled energy-transfer path while its internal driver supplies gate-drive voltage and timing. Diode emulation allows the low-side conduction behavior to be controlled to reduce reverse-recovery effects and improve conversion efficiency. This integration can shorten the critical power loop and make compact converter designs more practical than discrete driver-plus-MOSFET implementations. The ISL99125B family description highlights high-performance DrMOS operation for high-density DC/DC converters. The verified product-page snippet does not provide complete electrical tables, switching-frequency limits, voltage ratings, thermal-resistance values, or monitor accuracy, so those parameters are not inferred here. Engineers should use the official Renesas datasheet for exact limits, recommended operating conditions, pin functions, exposed-pad requirements, and application-specific derating. Typical uses include CPU and GPU point-of-load converters, server power rails, telecom and networking equipment, high-current industrial modules, notebook power systems, and other compact synchronous converters. The module is especially relevant when the PCB area available for discrete MOSFETs is limited and the converter requires high switching performance. The integrated current and temperature-monitor feature described in the verified results can support system telemetry, protection, and power management when configured according to the datasheet. For layout, place power connections and decoupling according to the Renesas datasheet and keep the high-current loop as compact as practical. Validate junction temperature, current capability, gate-drive settings, dead time, switching-node overshoot, and output ripple in the final converter rather than relying on nominal current ratings alone. The package also requires attention to exposed-pad soldering and thermal via or copper design for repeatable performance. This page combines the verified Renesas product description, manufacturer datasheet link, distributor package identification, and cross-reference research. It is intended to help engineers locate the correct documentation and understand the module class without filling missing electrical values with assumptions.
ISL99135B - 35A QFN DrMOS Power Module | Renesas
The Renesas ISL99135B is a 25A/35A DrMOS power module integrating a high-performance FET driver and MOSFETs in a 24-terminal QFN package for high-frequency synchronous DC/DC conversion. It is specified for a 5V nominal input rail, with a 4.75V minimum input voltage and a 5.25V maximum input voltage. The module combines a driver, integrated Schottky bootstrap diode, MOSFET pair, diode-emulation operation, and PS4 support to support high-density buck voltage regulators. A DrMOS module is an integrated driver-and-switch power stage used to place the control and switching functions close to the power conversion path. Its position in the power hierarchy is DrMOS module, integrated power stage, synchronous buck converter, DC/DC converter, and power-management IC. Integrating the driver and MOSFETs can reduce external switching-path inductance and simplify high-current converter layouts while retaining the regulation functions of an upstream controller. The verified product information identifies ISL99135B as a 25A/35A device with diode emulation and PS4. Its integrated Schottky bootstrap diode supports the high-side driver arrangement required by a synchronous buck stage. The 24-terminal QFN package and stated 35A capability make the module relevant to compact, high-frequency power-conversion designs where external discrete high-side and low-side MOSFET arrangements become layout-constrained. Detailed electrical limits and switching characteristics remain subject to the manufacturer datasheet. The ISL99135B is intended for high-density synchronous DC/DC power conversion, particularly designs using an external multiphase or voltage-regulator controller. Its integrated driver and MOSFET pair reduce the number of discrete power devices that must be placed around the switching node. Diode emulation can be useful when the design requires controlled negative inductor current behavior, while PS4 support identifies a specific Renesas power-stage feature whose exact implementation must be confirmed from the datasheet. Typical applications include CPU and GPU voltage-regulator modules, server and networking power conversion, point-of-load supplies, telecommunications equipment, and other compact high-current rails. For these systems, the 5V input range, integrated DrMOS architecture, 25A/35A current classification, and 24-terminal QFN package are the primary selection points. The controller, inductor, input capacitors, output capacitors, and layout still determine whether the complete converter meets transient, thermal, and efficiency targets. Designers should verify the exact pinout, electrical limits, recommended gate-drive conditions, thermal data, and exposed-pad connection directly from the Renesas datasheet before layout release. High-current DrMOS layouts require short switching paths, carefully placed input and output capacitors, adequate copper for thermal dissipation, and layout techniques that minimize high-di/dt loops. The QFN module should be treated as a power semiconductor package when evaluating thermal and safe-operating-area requirements.
ISL99390FRZ-TR5935 - 90A Smart Power Stage | Renesas
The Renesas Electronics ISL99390FRZ-TR5935 is a 90 A Gen2 Smart Power Stage (SPS) module with integrated high-accuracy current and temperature monitors, supplied in a 39-PowerWFQFN package measuring 5 mm by 6 mm. It is designed for high-current synchronous DC-DC conversion and power-management systems where integrated monitoring, protection, and compact integration are important. The verified distributor listing identifies the device as a half-bridge NMOS driver for DC-DC converters. A Smart Power Stage is an integrated power-conversion module that combines high-side and low-side switching functions with gate-drive circuitry and system monitoring. It belongs to the broader hierarchy of DC-DC converter power stages, power-management ICs, and semiconductor modules. By integrating the power switching and monitoring functions into one package, an SPS can simplify layout and reduce the number of external power components compared with discrete implementations. Verified product information identifies a 90 A current rating, Gen2 SPS architecture, and integrated current and temperature monitors. The device is associated with a 16 V-class power-stage product listing in distributor data, while one alternate distributor description states a 4.5 V to 24 V input range. Because the supplied data contains conflicting voltage descriptions, the detailed manufacturer datasheet should be consulted before selecting the device for a specific converter. Typical applications include high-current voltage-regulator modules for processors and accelerators, server and networking power systems, point-of-load converters, and other synchronous buck or multiphase power-conversion designs. Its 90 A rating makes it relevant to power stages requiring substantial output current, but the exact phase count, switching frequency, protection behavior, and electrical limits must be confirmed from the Renesas datasheet. Designers should verify the controller protocol, PWM and enable logic, current-sense connection, temperature-monitoring interface, exposed-pad thermal path, and recommended PCB layout before using this part in a new board. The integrated monitors can improve fault detection, but they do not eliminate the need for accurate layout, current-loop compensation, and thermal validation. XAIPART provides the official product page, distributor listings, and the manufacturer datasheet link for engineering review.
KA7500B - SMPS PWM Controller DIP-16 | onsemi
The onsemi KA7500B is a voltage-mode PWM controller IC designed for switch-mode power supplies (SMPS) and DC-DC converters, offered in a 16-pin PDIP (DIP-16) through-hole package with an absolute maximum supply voltage of 42 V and programmable switching frequency up to 300 kHz. It integrates a 5 V trimmed reference, on-chip oscillator, dead-time control, push-pull/single-ended output mode selection, and 200 mA sink/source output drivers for direct MOSFET drive in many topologies. The KA7500B is functionally equivalent to the industry-standard TL494 PWM controller family and is widely used as a drop-in replacement in legacy ATX, DC-DC, and inverter designs. A PWM controller (Pulse-Width Modulation controller) is a key building block in the power management IC hierarchy: PWM controller -> SMPS controller -> DC-DC controller -> power management IC. It regulates an output voltage by varying the duty cycle of a switching element (MOSFET or BJT) at a fixed frequency, enabling high-efficiency power conversion versus linear regulation. The KA7500B is a voltage-mode controller, meaning it regulates by comparing an error-amplifier output against an internal sawtooth ramp - a topology prized for its simplicity, predictable loop compensation, and noise immunity. Key features include a stable on-chip 5 V reference trimmed to 5%, uncommitted output transistors rated for 200 mA sink or source current, variable dead-time control on pin 4 for cross-conduction prevention, output mode selection for either push-pull (half-bridge/full-bridge) or single-ended operation, and a complete PWM power-control circuitry including error amplifiers, oscillator, and reference. The on-chip oscillator can be synchronized to an external master clock for multi-rail power systems, and the uncommitted outputs enable flexible topology choice. Operating temperature range is typically 0C to 70C (commercial grade). Typical applications include ATX/PC power supplies, DC-DC buck/boost/half-bridge converters, solar inverters, and uninterruptible power supplies. It also appears in welding equipment, induction heaters, and motor drives where TL494-class TL494 replacements are needed. The Ka7500B's DIP-16 through-hole package simplifies prototyping, repair, and retrofit work on legacy PCBs that were designed around the TL494 pinout. When designing with this device, ensure the oscillator timing resistor RT and capacitor CT are selected to set the switching frequency below 300 kHz with adequate margin. Add proper bypass capacitance on VCC and VREF, and use the dead-time control pin to set the minimum off-time to prevent simultaneous conduction of the push-pull output transistors. This page synthesizes distributor pricing, drop-in TL494-family alternatives, and practical design notes not consolidated in any single manufacturer datasheet.
KTA1136EUAE-TR - 13W 802.3af PoE PD Controller | Kinetic
The Kinetic Technologies KTA1136EUAE-TR is an IEEE 802.3af Power over Ethernet (PoE) Powered Device (PD) controller with an integrated DC-DC controller and 13W power FET, housed in a 16-pin TQFN (4x4 mm) package. A PoE PD controller is a power-management IC that sits at the powered end of an Ethernet link and performs the handshake required by the IEEE 802.3 standard: it presents the correct detection signature to the Power Sourcing Equipment (PSE), communicates its power class, and disconnects the load until valid power is negotiated. Within the power-management IC hierarchy, a PoE PD controller occupies the system-power layer between the RJ45/magnetics input stage and the downstream DC-DC conversion stage. The KTA1136 integrates input surge protection, a PD controller with a 100V-rated hot-swap FET, a DC-DC converter controller, and a robust 150V-rated switching power MOSFET in a single chip. This high level of integration eliminates the external pass transistor, hot-swap circuitry, and switching controller typically required in a discrete PoE PD design, reducing bill-of-material count and board area. It implements all physical-layer PD functionality required by IEEE 802.3af-2003, including PD detection, classification, under-voltage lockout (UVLO), and hot-swap FET control, and is also listed by distributors as supporting 802.3at (PoE+) and 802.3bt listings. Typical applications include Voice over IP (VoIP) phones, wireless access points, IP security cameras, and other 13W-class PoE powered devices. The integrated 13W power stage makes it well matched to single-class PD endpoints that draw power directly from the 48V Ethernet rail. When designing with this part, verify the external DC-DC power stage component ratings against the integrated 150V MOSFET and follow the manufacturer datasheet layout guidance for the hot-swap and switching nodes. This page synthesizes distributor data, cross-reference findings, and engineering design context not found in a single datasheet, including verified source links and lifecycle information.
KTA1137AEUAB-TR - 30W 802.3at PoE PD Controller | Kinetic
The Kinetic Technologies KTA1137AEUAB-TR is a single-chip IEEE 802.3at (PoE+) and 802.3af (PoE) Powered Device (PD) controller with an integrated DC-DC controller, supporting up to 30W input power in a 20-TQFN (5x5 mm) package. A Power over Ethernet Powered Device controller is the interface IC that performs PD detection, classification, and inrush current limiting when a device such as an IP camera, wireless access point, or VoIP phone draws power from Ethernet cabling. It sits within the power management IC hierarchy, combining the PoE handshaking front end and a switching power supply controller in a single CMOS die, which removes the need for a separate PWM controller in many designs. Key features include compliance to both IEEE 802.3af (13W) and IEEE 802.3at (30W) power classes, an integrated DC-DC controller optimized for isolated and non-isolated converter topologies, and single-chip CMOS integration that reduces bill-of-materials count. According to Kinetic Technologies product documentation, the KTA1137A family is a highly integrated solution for PoE Powered Devices requiring input power of up to 30 watts. On the technical side, the device supports flyback converter topologies; the manufacturer evaluation board (KTA1137AEUAB-MMEV02) demonstrates a 12V, 25W flyback converter for PD applications, confirming real-world performance near the full 30W capability. The integrated controller architecture simplifies transformer-based isolated designs as well as non-isolated buck-derived converters. Typical applications include IP security cameras, 802.11ac/ax wireless access points, VoIP telephones, network switches with PD ports, and building automation endpoints that must be powered entirely over standard Ethernet cabling. A key design consideration is that the KTA1137A is pin compatible with the discontinued AS1138, so engineers migrating legacy AS1138-based PD designs can substitute with minimal PCB rework. Verify transformer specifications against the target output power class. This page synthesizes distributor availability data, the AS1138 pin-compatibility cross-reference, and practical design context not found in the manufacturer datasheet alone.
L4984DTR - Current-Mode CCM PFC Controller | STMicroelectronics
The STMicroelectronics L4984DTR is a current-mode power-factor-correction controller operating in continuous-conduction mode with line-modulated fixed-off-time control. It accepts a 10.3 V to 22.5 V supply, features 1.1 V lockout and a 65°C startup threshold, and is packaged in a 10-lead SSOP. The device is designed for mains-powered switching systems requiring active power-factor correction. A power-factor-correction controller is a specialized power-management IC that shapes input current drawn from an AC line. By commanding a switching converter at the proper timing, it reduces reactive current and improves the line power factor. The L4984D belongs to the PFC-controller hierarchy and supports boost-type front ends commonly placed ahead of downstream DC-DC converters in industrial, commercial, and consumer power supplies. The supplied L4984D information identifies continuous-conduction operation, current-mode control, LM-FOT modulation, a 10.3 V to 22.5 V supply range, 1.1 V lockout, and approximately 5 mA operating current from distributor technical summaries. The 10-SSOP package supports compact surface-mount layouts. These values should be checked against the complete manufacturer datasheet before production release because the verified data does not include every timing, threshold, gate-drive, and protection parameter. In a typical boost PFC stage, the controller senses inductor or input current and regulates the switching command so the input waveform is shaped toward unity power factor. LM-FOT control adapts the off-time to line conditions, while continuous-conduction mode favors lower current ripple than discontinuous operation. The external power stage, current-sense network, compensation components, and protection thresholds remain design-specific. L4984DTR is suited to offline AC-DC front ends, server and telecom power systems, industrial power supplies, and consumer adapter designs when an active PFC stage is required. Designers must validate startup behavior, loop stability, inductor sizing, MOSFET selection, current-sense limits, and safety isolation under their operating line range. The principal design consideration is that controller selection is only one part of PFC qualification. Check the exact STMicroelectronics datasheet and reference design for recommended gate-drive, compensation, sensing, and protection values. Confirm whether the 10-SSOP footprint, pin functions, voltage limits, and switching timing match the target PCB before committing to a drop-in replacement. This page consolidates the verified L4984DTR product-page and distributor information, explicitly separates known values from unavailable data, and provides replacement guidance without presenting unverified substitutes as drop-in equivalents.
L6566BTR - Multi-Mode PWM SMPS Controller, 300kHz, SO-16 | STMicroelectronics
The STMicroelectronics L6566BTR is a multi-mode current-mode PWM controller for high-performance offline flyback converters, packaged in a 16-pin SO (SO-16) tape-and-reel format. It combines a fixed-frequency and quasi-resonant topology switchable on the fly, on-board 700 V high-voltage start-up, and a 10 kHz to 300 kHz programmable switching range. The controller integrates adaptive UVLO, line feedforward for constant power vs. mains, and advanced light-load management that reduces quiescent current to about 3 mA. What is a multi-mode SMPS controller? It is a power-supply control IC that automatically transitions between operating modes - typically quasi-resonant (valley-switching) at high load and frequency-foldback or burst-mode at light load - to optimize efficiency across the entire load curve. The L6566B family belongs to ST's L65xx power-management portfolio, used as the primary-side controller in AC-DC switch-mode power supplies. The hierarchy is: PWM controller -> SMPS controller -> power management IC -> semiconductor. Key features include 8 V to 23 V supply range, 800 mA peak source/sink gate drive capability, programmable maximum duty cycle, overcurrent protection with fault counter, and transformer-saturation detection. The integrated high-voltage startup eliminates the external startup resistor network, reducing BOM count and standby loss. These specifications make the L6566BTR suited for compliance-driven adapters, set-top boxes, and white-goods SMPS designs targeting ENERGY STAR and EuP Tier-2 standby targets. The 'UVLO' (Undervoltage Lockout) and 'PWM' (Pulse Width Modulation) abbreviations are industry-standard. Architecturally, the L6566BTR uses a current-mode control loop with a leading-edge blanking, plus a valley-detection block that identifies the drain-voltage valleys for quasi-resonant switching. The 700 V startup MOSFET is rated for direct connection to the rectified mains, and the controller auto-restarts on fault events with user-programmable retry timing. The 16-pin SO package is JEDEC-standard (SO-16 narrow body, 150 mil) for surface-mount assembly, with RoHS-compliant lead-free finish and MSL Level 1 moisture rating. Typical applications include notebook adapters, set-top box power supplies, LCD TV SMPS, white-goods auxiliary supplies, and any offline flyback design requiring both high efficiency at full load and ultra-low standby power at no load. The device is also described in datasheet literature as suitable for single-stage PFC converters meeting EN61000-3-2. When designing with this part, ensure the HV pin is connected to the rectified mains through an external resistor network sized for inrush, and place the optocoupler feedback loop compensation components per the application note reference design. Avoid exceeding the 23 V Vcc absolute maximum to prevent IC damage during transient events. This page synthesizes STMicroelectronics datasheet figures, current distributor stock and pricing, and engineer-oriented drop-in alternatives not consolidated in a single vendor product page.
L6591TR - ZVS Half-Bridge PWM Controller | STMicroelectronics
The STMicroelectronics L6591TR is a double-ended current-mode PWM controller designed for soft-switched (Zero-Voltage Switching, ZVS) half-bridge topology, operating up to 500 kHz and packaged in a 16-pin SOIC. It delivers complementary gate-drive outputs with duty cycle D for the high-side switch and 1-D for the low-side switch (D < 50%), an externally programmable deadtime between alternating gate transitions, and on-board high-voltage start-up. A half-bridge PWM controller (also called a resonant or ZVS half-bridge controller) is a power-management IC that drives two MOSFETs in a totem-pole arrangement across a transformer primary, switching at zero voltage across the drain-source of each FET to minimize switching losses. Within the broader power-electronics taxonomy, this places the device in: power management IC -> AC-DC converter -> resonant controller -> half-bridge ZVS controller. The soft-switching technique is widely used in switch-mode power supplies (SMPS) where efficiency and EMI performance are critical, including adapters, LCD-TV power, and telecom converters. Key features include 500 kHz maximum switching frequency, programmable deadtime to avoid cross-conduction, adaptive Under-Voltage Lockout (UVLO) with line-sensing, pulse-by-pulse Over-Current Protection (OCP), latched or auto-restart Over-Load Protection (OLP), and advanced light-load management that disables one gate at low load to reduce circulation losses. The high-voltage start-up cell draws power directly from the bulk rail, eliminating an external auxiliary winding for start-up. The L6591 employs a current-mode control architecture with a leading-edge blanking circuit on the current-sense input, providing clean cycle-by-cycle current limiting even with leading-edge spikes from the resonant tank. The integrated bootstrap driver for the high-side switch simplifies the gate-drive network and supports switching frequencies up to 500 kHz, well beyond conventional hard-switched half-bridge controllers. Typical applications include resonant and quasi-resonant SMPS for LCD TVs, laptop adapters, game-console power supplies, telecom DC-DC converters, and industrial AC-DC adapters. Designers choose the L6591TR when ZVS operation is required for efficiency above 90% and reduced EMI versus hard-switched topologies. A critical design consideration is the deadtime programming: too short causes shoot-through losses, too long increases body-diode conduction. The companion L6668 (multi-mode controller) and the L6599 (LLC resonant half-bridge with high-voltage start-up) are members of the same ST controller family; the L6591TR remains a cost-effective choice for ZVS half-bridge topologies below ~200 W. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, including cross-brand pin-compatible equivalents and recommended companion power MOSFETs for resonant tank designs.
L6984TR - 36V, 400mA Sync Step-Down Converter | STMicroelectronics
The STMicroelectronics L6984TR is a 36 V, 400 mA synchronous monolithic step-down switching regulator housed in a 10-pin VFDFN exposed-pad package. It integrates the high-side and low-side power MOSFETs, supports an adjustable output from 0.9 V to 28 V, and ships in a fixed 3.3 V VOUT variant that needs no external resistor divider. The device operates across a 4.5 V to 36 V input range, making it suited to 12 V/24 V industrial and automotive rails. A switching DC-DC converter (buck regulator) is a power management IC that steps a higher DC input voltage down to a lower regulated DC output voltage using a controlled switching element, an inductor, and an output capacitor. Synchronous buck converters integrate a low-side rectifier MOSFET (replacing the traditional Schottky diode) to improve efficiency, especially at light loads. The L6984TR belongs to ST's L698x family of step-down regulators within the broader power management IC hierarchy, designed for distributed point-of-load applications where small PCB area and high efficiency at low current are required. Key features of the L6984TR include a wide 4.5 V-36 V input range, integrated high-side and low-side MOSFETs, an internal reference of 0.9 V with ±2% accuracy, a fixed 3.3 V VOUT option, Low Consumption Mode (LCM) that maintains efficiency at light load with controlled output ripple, and internal compensation. The synchronous rectification architecture minimizes external component count while preserving high efficiency across the 0.4 A load profile. Internally, the L6984TR uses a peak-current-mode control topology with an embedded compensation network, allowing the device to operate with a small 4.7 µH-22 µH inductor and low-value ceramic output capacitors. The internal N-MOSFET pair is sized for 400 mA continuous load, and the LCM function automatically skips pulses at light load to keep quiescent current low and reduce output ripple below audible bands. Typical applications include 24 V industrial sensor rails, automotive body and accessory supplies, distributed 5 V/3.3 V point-of-load conversion in PLC modules, smart metering, and low-power IoT edge nodes. The wide input range also covers 12 V battery and 24 V bus transient environments. When designing with the L6984TR, choose the inductor value based on the switching frequency (typically 250 kHz-1 GHz depending on variant) and ripple target. Place the input ceramic capacitor close to the VIN pin and connect the exposed pad (EP) to a sufficiently large copper island to dissipate up to ~1 W continuous. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. Source pricing reflects up-to-date distributor listings as of 2026-10-08.
L7980TR - 2A Step-Down Switching Regulator | STMicroelectronics
The STMicroelectronics L7980TR is a step-down switching regulator capable of delivering up to 2A output current. It operates from an input voltage range of 4.5V to 28V and provides an adjustable output voltage down to 0.6V. The device is available in an 8-pin SOIC package (SO-8) and is designed for high-efficiency power conversion in a wide range of applications. A step-down switching regulator, also known as a buck converter, is a type of DC-DC converter that efficiently reduces a higher input voltage to a lower output voltage. Unlike linear regulators, which dissipate excess power as heat, switching regulators use an inductor, a switch, and a diode to transfer energy in discrete pulses, achieving efficiencies often above 90%. This makes them essential in battery-powered and high-current applications where power loss must be minimized. The L7980TR belongs to the broader category of power management ICs, specifically within the DC-DC converter family. Key features of the L7980TR include a 250 kHz fixed switching frequency, an internal power MOSFET with a low RDS(on) of 250 mOhm, and a high-efficiency design that minimizes external component count. The device also includes an internal compensation network, soft-start, and thermal shutdown protection, simplifying the design process. The adjustable output voltage, set by an external resistor divider, allows flexibility for various output levels. The L7980TR utilizes a current-mode control architecture, providing fast transient response and stable operation over a wide range of load currents. The internal compensation eliminates the need for external compensation components, reducing board space and design complexity. The device's high switching frequency allows the use of small, low-cost inductors and capacitors, further reducing the overall solution footprint. Typical applications include point-of-load (POL) converters for FPGAs, DSPs, and microcontrollers, as well as distributed power systems, battery chargers, and industrial control systems. The wide input voltage range makes it suitable for 12V and 24V industrial buses, while the high efficiency extends battery life in portable devices. When designing with the L7980TR, ensure proper PCB layout with short, wide traces for high-current paths and adequate grounding. The exposed pad (if present) should be connected to the ground plane for thermal dissipation. Input and output capacitors should be placed close to the IC to minimize parasitic inductance and ensure stable operation.
L7981TR - 2A Step-Down Switching Regulator | STMicroelectronics
The STMicroelectronics L7981TR is a step-down switching regulator capable of delivering up to 2A output current from an input voltage range of 4.5V to 28V. Housed in a compact 8-pin SOIC (SO-8) package, this device integrates a high-side power MOSFET and provides a fixed 3.3V output voltage, making it suitable for a wide range of power conversion applications. A step-down switching regulator, also known as a buck converter, is a type of DC-DC converter that efficiently reduces a higher input voltage to a lower output voltage. Unlike linear regulators, which dissipate excess power as heat, switching regulators use an inductor and a switch to transfer energy in discrete pulses, achieving high efficiency, especially when the input-to-output voltage difference is large. The L7981TR belongs to the broader category of power management ICs, specifically within the DC-DC converter family, and is designed for applications requiring reliable and efficient voltage step-down. Key features of the L7981TR include a 2A output current capability, a wide input voltage range of 4.5V to 28V, and a fixed 3.3V output voltage. The device operates at a switching frequency of 250 kHz, which balances efficiency and component size. It also features internal current limiting, thermal shutdown, and an enable pin for power sequencing. The SO-8 package offers a compact footprint with a thermal resistance of approximately 62.5 C/W, allowing for moderate power dissipation without external heatsinking. The L7981TR utilizes a current-mode control architecture, which provides fast transient response and simplifies loop compensation. The integrated high-side MOSFET reduces external component count, while the internal compensation network minimizes design complexity. The device's high efficiency, typically above 85% for 12V to 3.3V conversion at 1A load, makes it suitable for battery-powered and industrial applications where power loss must be minimized. Typical applications include point-of-load (POL) converters for microcontrollers and FPGAs, industrial control systems, and distributed power architectures. The wide input range allows operation from 5V USB supplies, 12V industrial rails, and 24V bus systems, providing design flexibility across multiple platforms. When designing with the L7981TR, ensure proper input and output capacitor selection to maintain stability and minimize output ripple. The enable pin allows sequenced power-up in multi-rail systems, which is critical for processors requiring specific rail sequencing. Additionally, the thermal pad on the SO-8 package should be connected to a sufficient copper area for heat dissipation.
L7983TR - 38V 3A Step-Down Switching Regulator | STMicroelectronics
The STMicroelectronics L7983TR is a step-down switching regulator (buck converter) capable of delivering up to 3A output current from an input voltage range of 4.5V to 38V. Housed in a compact 8-pin SOIC (SO-8) package, this device integrates a high-side power MOSFET and provides a fixed 250kHz switching frequency, making it suitable for a wide range of power conversion applications. A buck converter, also known as a step-down regulator, is a type of DC-DC converter that efficiently reduces a higher input voltage to a lower output voltage. It operates by rapidly switching a transistor on and off, storing energy in an inductor during the on-time and releasing it to the load during the off-time. This switching action achieves high efficiency, typically above 85%, which is critical in battery-powered and thermally constrained systems. The L7983TR belongs to the family of switching regulators, which are a subset of power management ICs, and is designed to replace less efficient linear regulators in applications where power dissipation is a concern. Key features of the L7983TR include a 3A output current capability, a wide input voltage range of 4.5V to 38V, and a fixed 250kHz switching frequency. The device offers internal compensation, simplifying the design by reducing external component count. It also includes overcurrent protection, thermal shutdown, and an enable pin for power sequencing. The high switching frequency allows for the use of small inductors and capacitors, reducing the overall solution footprint. The L7983TR utilizes a current-mode control architecture, which provides fast transient response and stable operation over a wide range of load conditions. The integrated high-side MOSFET minimizes external component count and reduces conduction losses. The device is designed for high efficiency, with a typical efficiency of 90% at 12V input and 5V output at 2A load. The internal soft-start function limits inrush current during startup, preventing output overshoot. Typical applications include industrial power supplies, automotive systems, distributed power architectures, and point-of-load (POL) converters. The wide input voltage range makes it suitable for 12V and 24V bus systems, while the 3A output current can power FPGAs, microcontrollers, and sensors. The enable pin allows for power sequencing in multi-rail systems, ensuring proper startup order. When designing with the L7983TR, ensure proper PCB layout with short, wide traces for high-current paths and adequate ground plane for thermal management. The inductor and output capacitor should be placed close to the IC to minimize parasitic inductance. The feedback resistor divider should be placed away from the inductor to avoid noise coupling. The thermal pad (if present) should be soldered to a large copper area for heat dissipation.
L7985TR - 2A Step-Down Switching Regulator | STMicroelectronics
The STMicroelectronics L7985TR is a step-down switching regulator capable of delivering up to 2A output current. It operates from an input voltage range of 4.5V to 38V, making it suitable for a wide variety of industrial and automotive applications. The device is available in a compact HSOP-8 package, which is designed for surface-mount assembly and provides excellent thermal performance. A step-down switching regulator, also known as a buck converter, is a type of DC-DC converter that efficiently reduces a higher input voltage to a lower output voltage. Unlike linear regulators, which dissipate excess power as heat, switching regulators use an inductor and a switch to transfer energy in a controlled manner, achieving high efficiency. The L7985TR belongs to the family of voltage regulators, which are essential components in power management systems, converting unregulated power sources into stable, usable voltages for electronic circuits. Key features of the L7985TR include a 250 kHz fixed switching frequency, an internal power MOSFET, and a current-mode control architecture. The device offers a typical efficiency of over 85% at full load, reducing power loss and heat generation. It also includes a built-in soft-start function to limit inrush current during startup, and a thermal shutdown protection to prevent damage from overheating. The output voltage is adjustable from 0.6V to the input voltage, providing flexibility for various design requirements. The L7985TR utilizes a current-mode control scheme, which provides fast transient response and simplifies loop compensation. The internal power switch is rated for a peak current of 3A, ensuring reliable operation under load transients. The device also features a low quiescent current of 2.5 mA, which is beneficial for battery-powered applications. The HSOP-8 package has a thermal resistance of 40°C/W, allowing for efficient heat dissipation in moderate power applications. Typical applications for the L7985TR include point-of-load converters, distributed power systems, industrial control systems, and automotive power supplies. Its wide input voltage range and high efficiency make it ideal for converting 12V or 24V bus voltages to lower logic rails. The device is also suitable for LED lighting applications, where constant current regulation is required. When designing with the L7985TR, it is important to select the appropriate inductor and output capacitor values to ensure stable operation. The datasheet provides a detailed design procedure and recommended component values for various output voltages and currents. Additionally, proper PCB layout is critical to minimize parasitic inductance and ensure reliable performance.
L7986A - 3A 61V Step-Down Switching Regulator | STMicroelectronics
The STMicroelectronics L7986A is a step-down switching regulator with an input voltage range of 4.5V to 61V and a maximum output current of 3A. It is available in a HSOP-8 package with an exposed pad for enhanced thermal performance. The device integrates a 250mOhm high-side MOSFET, enabling high efficiency in a compact footprint. A step-down switching regulator, also known as a buck converter, is a type of DC-DC converter that steps down a higher input voltage to a lower output voltage with high efficiency. Unlike linear regulators, which dissipate excess power as heat, switching regulators use an inductor and a switch to transfer energy in discrete packets, achieving efficiencies often above 90%. The L7986A belongs to the family of power management ICs, specifically DC-DC converters, which are essential in systems requiring voltage conversion with minimal power loss. Key features of the L7986A include a 250kHz fixed switching frequency, an internal compensation network, and a power-good (PGOOD) open-drain output for monitoring output voltage status. The device also offers a soft-start function to limit inrush current during startup, and a thermal shutdown protection to prevent damage from overheating. The high input voltage capability of 61V makes it suitable for automotive and industrial applications where the supply rail can experience transients. The L7986A uses a current-mode control architecture, which provides fast transient response and simplifies loop compensation. The internal high-side MOSFET has a low on-resistance of 250mOhm, reducing conduction losses and improving efficiency at high load currents. The device operates at a fixed 250kHz switching frequency, balancing efficiency and external component size. The HSOP-8 package with exposed pad ensures efficient heat dissipation, allowing the regulator to deliver full 3A output current without additional heatsinking in many applications. Typical applications include automotive power supplies, industrial control systems, and distributed power architectures. In automotive systems, the wide input range accommodates 12V and 24V battery systems, while the high efficiency reduces thermal stress. In industrial settings, the regulator can step down 48V rails to lower voltages for logic and sensor circuits. The PGOOD output simplifies power sequencing in multi-rail systems. When designing with the L7986A, ensure proper PCB layout with short, wide traces for high-current paths and adequate copper area for the exposed pad to dissipate heat. The input and output capacitors should be placed close to the IC to minimize parasitic inductance. The soft-start capacitor value determines the startup time and inrush current, which should be selected based on the load requirements.
L7986TR - 3A 61V Step-Down Switching Regulator | STMicroelectronics
The STMicroelectronics L7986TR is a step-down switching regulator with an input voltage range of 4.5V to 61V and a maximum output current of 3A. It is available in a HSOP-8 package with exposed pad, designed for high-efficiency power conversion in industrial and automotive applications. Data verified as of 2026-08-05. A step-down (buck) switching regulator is a type of DC-DC converter that efficiently reduces a higher input voltage to a lower output voltage. Unlike linear regulators, which dissipate excess power as heat, switching regulators use an inductor and switch to transfer energy in pulses, achieving efficiencies often above 90%. This makes them essential in power management systems where thermal budget and battery life are critical, such as in industrial control, automotive electronics, and distributed power architectures. Key features of the L7986TR include a 250 kHz fixed switching frequency, an internal power MOSFET, and a high-voltage capability up to 61V. The device offers a low dropout operation and a wide output voltage range from 0.6V to VIN, making it versatile for various rail requirements. It also includes built-in protection features such as thermal shutdown, current limiting, and an enable pin for power sequencing. The L7986TR uses a current-mode control architecture, providing fast transient response and stable operation with a wide range of output capacitors. The internal compensation simplifies design, reducing external component count. The HSOP-8 package with exposed pad enhances thermal performance, allowing the device to deliver full 3A output current without excessive junction temperature rise when properly laid out. Typical applications include industrial 24V bus systems, automotive power supplies, and point-of-load converters. The wide input range and high efficiency make it suitable for pre-regulation in multi-rail systems, where it can step down a high-voltage bus to an intermediate rail for downstream linear regulators or low-voltage switching converters. When designing with the L7986TR, ensure proper input and output capacitor selection and adequate PCB copper area for thermal dissipation. The enable pin allows for controlled startup sequencing in multi-rail systems, which is critical for processor-based designs. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the ST datasheet, providing a comprehensive resource for engineers evaluating the L7986TR.
L7987 - 61V 3A Async Step-Down DC/DC Converter | STMicroelectronics
The STMicroelectronics L7987 is a 61 V, 3 A asynchronous step-down monolithic switching regulator in a 16-pin HTSSOP (exposed pad) package. The output voltage is adjustable from 0.8 V to VIN, and the wide 100% duty-cycle input span meets fail-safe requirements for industrial systems. The device embeds a high-side N-channel power MOSFET and a low-side driver for an external diode, achieving typical efficiencies in the 90% range across most of the load curve. A step-down (buck) switching regulator is a DC/DC converter topology that produces a lower output voltage from a higher input voltage by switching an inductor-capacitor filter at high frequency. Asynchronous buck regulators use a Schottky diode for the freewheeling path instead of a second MOSFET, trading a small amount of efficiency for simplicity and lower BOM cost. Buck regulators sit within the broader power-management hierarchy: switching regulator -> DC/DC converter -> voltage regulator -> power management IC. They are preferred over linear regulators (LDOs) whenever the input-to-output voltage differential or load current is large enough that linear efficiency would be unacceptably low. Key features of the L7987 include a fixed 250 kHz switching frequency (adjustable with an external resistor from 250 kHz to 1500 kHz), external synchronization input (SYNCH pin), embedded switchover on the VBIAS pin that maximizes efficiency at light load, adjustable current limitation, and thermal shutdown. The 16-HTSSOP exposed pad keeps junction-to-ambient thermal resistance low enough to dissipate multi-watt loads without an external heatsink. The architecture uses peak-current-mode control, which simplifies loop compensation and provides inherent input-voltage feed-forward. Typical applications include industrial 24 V/48 V bus regulation, distributed point-of-load conversion, battery-powered equipment, and any system where a wide input voltage range and high efficiency must coexist in a compact 16-pin surface-mount footprint. When laying out this device, place the input bypass capacitor and the bootstrap capacitor directly at their respective pins, keep the high-current loop area minimal, and stitch thermal vias into the exposed pad to pull heat into the inner copper planes.
L7987LTR - 3A 61V Step-Down Switching Regulator | STMicroelectronics
The STMicroelectronics L7987LTR is a step-down switching regulator (buck converter) capable of delivering up to 3A of continuous output current from a wide input voltage range of 4.5V to 61V. Housed in a compact HTSSOP-16 package with exposed pad, this device integrates a high-side power MOSFET and provides excellent efficiency for industrial, automotive, and general-purpose power conversion applications. A buck converter, also known as a step-down switching regulator, is a type of DC-DC converter that efficiently reduces a higher input voltage to a lower output voltage. Unlike linear regulators, which dissipate excess power as heat, buck converters use switching elements (transistors) and energy storage components (inductors and capacitors) to achieve high efficiency, often exceeding 90%. This makes them essential in power management systems where thermal constraints and battery life are critical. The L7987LTR belongs to the broader category of switching regulators, which are a subset of voltage regulators within power management ICs. Key features of the L7987LTR include a programmable switching frequency from 250 kHz to 1 MHz, allowing designers to optimize efficiency versus component size. It offers a low quiescent current of 1.3 mA in light-load conditions, making it suitable for battery-powered applications. The device also features an internal compensation network, simplifying the design process, and includes a power-good flag for system monitoring. Its wide input voltage range of up to 61V makes it ideal for automotive systems that must withstand load-dump transients. The L7987LTR utilizes a current-mode control architecture, providing fast transient response and stable operation over a wide range of output voltages. The integrated high-side MOSFET reduces external component count and PCB area. The device is available in a thermally enhanced HTSSOP-16 package, which offers a low thermal resistance of 40°C/W, enabling efficient heat dissipation in high-power applications. Typical applications include industrial power supplies, automotive infotainment systems, distributed power architectures, and battery chargers. Its ability to handle high input voltages and deliver 3A output makes it a versatile choice for point-of-load regulation in harsh environments. When designing with the L7987LTR, ensure proper PCB layout with short, low-inductance paths for the switching node and adequate copper area for thermal management. The exposed pad should be soldered to a large ground plane to maximize heat dissipation. Additionally, select an inductor with a saturation current rating above the peak switch current to avoid core saturation.
LM22675MR-5.0/NOPB - 1A, 42V SIMPLE SWITCHER Buck Converter | TI
The Texas Instruments LM22675MR-5.0/NOPB is a 1 A step-down (buck) DC/DC switching regulator from TI's SIMPLE SWITCHER® family, offering a fixed 5 V output, a 4.5 V to 42 V input range, and a 500 kHz typical switching frequency in an 8-pin HSOIC (DDA) PowerPAD package with an exposed thermal pad. A buck (step-down) switching regulator is a type of DC-DC converter that uses an internal MOSFET switch, an external inductor, and a control loop to convert a higher DC input voltage into a lower DC output voltage with high efficiency. It belongs to the hierarchy: buck converter → DC-DC converter → power management IC → semiconductor. Unlike linear regulators, switching bucks do not dissipate VIN-VOUT as heat, so they deliver high efficiency (often >85%) across a wide VIN range, making them the standard choice for converting industrial 24 V rails, automotive 12 V battery rails, or other high-voltage buses down to logic-level voltages. Key specifications include 1 A continuous output current, 4.5 V to 42 V wide VIN range, internal 500 kHz switching frequency (set by an internal oscillator, no external RT needed on the fixed Voutout parts), integrated soft-start, precision enable pin with wide hysteresis for adjustable UVLO, and current-mode control for line/load transient performance. The HSOIC-8 (DDA) PowerPAD package provides a low thermal resistance path that lets the part deliver full 1 A output across the full -40 °C to +125 °C operating junction-temperature range. The regulator uses peak current-mode control with internal compensation on the fixed-output versions, a wide-bandwidth error amplifier, and an integrated 150 mΩ high-side N-channel MOSFET. The precision enable input doubles as a programmable under-voltage-lockout threshold, and the SS/TRK pin provides a controlled monotonic startup that limits inrush current from large output capacitors. Combined with internal cycle-by-cycle current limit and thermal shutdown, the architecture is engineered for fault-tolerant industrial and automotive environments. Typical applications include 24 V industrial sensor and PLC power rails, automotive infotainment and body electronics (the -Q1 variant), 48 V telecom point-of-load conversion, point-of-load regulation after a front-end isolated supply, and battery-powered systems that need a tightly regulated 5 V rail from a varying battery voltage. When designing with the LM22675MR-5.0/NOPB, follow the datasheet's recommended inductor (4.7 µH to 10 µH, low DCR), input/output ceramic capacitor (≥4.7 µF X7R with low ESR), and bootstrap capacitor (≥0.1 µF) values. Keep the high-di/dt switching loops short and stitch the exposed PowerPAD to a large ground copper pour to keep θJA within the datasheet-recommended 30 °C/W board condition. This page synthesizes distributor pricing, drop-in cross-brand alternatives, and practical design notes that go beyond the manufacturer datasheet — including a side-by-side comparison against same-brand and competing 42 V / 1 A buck ICs and PCB layout pitfalls specific to the HSOIC-8 PowerPAD footprint.
LM22675MRX-5.0/NOPB - 1A 42V SIMPLE SWITCHER Buck | 5V Fixed
The Texas Instruments LM22675MRX-5.0/NOPB is a 1 A, 42 V SIMPLE SWITCHER step-down (buck) DC-DC converter with a fixed 5.0 V output, packaged in an 8-pin HSOIC (DDA) PowerPAD exposed-pad package. It accepts a wide 4.5 V to 42 V input range, runs at a fixed 500 kHz switching frequency, and uses voltage-mode PWM control with an N-channel high-side MOSFET integrated on-chip. The device includes a precision enable pin for power sequencing and supports an operating junction temperature range of -40 C to +125 C. A buck (step-down) DC-DC switching converter is a switched-mode power supply topology that uses an inductor, output capacitor, and a high-frequency switching element to convert a higher DC input voltage to a lower DC output voltage at high efficiency (typically 90% or better). Within the broader power-management hierarchy, a buck converter sits under DC-DC converters, then under voltage regulators, then under power management ICs, and finally under semiconductors. SIMPLE SWITCHER is TI's family of easy-to-use, internally-compensated synchronous and non-synchronous buck regulators aimed at simplifying the design of point-of-load supplies. The LM22675 integrates a 0.15 ohm N-channel high-side MOSFET, supports duty cycles up to 90%, and includes internal cycle-by-cycle current limiting, thermal shutdown, and an under-voltage lockout. The fixed 5.0 V output option (this variant) eliminates the external feedback divider, simplifying BOM and PCB area. Its 4.5 V to 42 V input range comfortably handles 12 V, 24 V, and 36 V industrial bus transients, making it well suited to industrial, automotive aftermarket, and telecom point-of-load applications. Typical applications include 24 V industrial sensor and actuator power rails, factory automation I/O modules, telecom base-station auxiliary supplies, automotive body electronics (non-safety), battery-powered systems with wide input range, and any point-of-load regulation from a 12 V or 24 V bus down to a local 5 V rail for microcontrollers, FPGAs, or interface ICs. When designing with this device, place the input ceramic bypass capacitor as close as possible to the VIN and GND pads, and ensure the PowerPAD is soldered to a sufficiently large copper pour (at least 1 square inch) to keep the junction temperature within safe limits at full 1 A load. The fixed 5.0 V version cannot be reconfigured to other output voltages - choose the LM22675MRX-ADJ/NOPB variant if a non-5 V output is required. This page synthesizes current distributor pricing, parametric drop-in alternatives, and practical design guidance for the LM22675MRX-5.0/NOPB into a single reference not found in the manufacturer datasheet alone.
LM25010SD/NOPB - 42V, 1A Step-Down Switching Regulator | TI
The Texas Instruments LM25010SD/NOPB is a 42V wide-input, 1A constant on-time non-synchronous buck (step-down) switching regulator housed in a 10-pin WSON (DPR) exposed-pad package. It integrates a 42V N-Channel buck switch and is engineered to deliver an adjustable output from 2.5V to 37V from a 6V to 42V input rail, with a switching frequency that varies with line and load to maintain a constant on-time topology. A buck switching regulator (also called a step-down converter) is a switch-mode DC-DC power converter that produces a lower DC output voltage from a higher DC input voltage. It uses an N-channel MOSFET switch, an inductor, a freewheeling diode, and output capacitance to chop the input waveform and then reconstruct a regulated lower voltage. The LM25010 is a non-synchronous variant, meaning it uses an external Schottky diode rather than a second integrated MOSFET for freewheeling, which keeps cost low and efficiency acceptable in 12V/24V industrial bus systems. Key features of the LM25010SD/NOPB include an integrated 42V N-Channel buck switch, an intelligent constant on-time control scheme that provides fast transient response, internal soft-start, and a thermally-enhanced 10-pin WSON exposed-pad package that allows direct soldering to a PCB thermal pad for heat spreading. It requires no loop compensation, simplifying design-in compared to peak-current-mode parts. The regulator operates over a -40C to +125C junction temperature range suitable for industrial and automotive environments. Architecturally, the LM25010 uses a constant on-time (COT) control architecture with adaptive on-time based on VIN. This gives the converter a pseudo-fixed frequency behavior that reduces acoustic noise and produces fast line/load transient response without the need for external compensation components. The high-side N-FET is integrated, while the low-side path uses an external Schottky diode, balancing cost and efficiency. Typical applications include 12V and 24V industrial bus point-of-load regulation, 48V telecom and distributed-power architectures, automotive infotainment and chassis subsystems, battery-powered equipment, and general-purpose 5V/3.3V/2.5V high-current rails from a wide VIN source. It is well suited to any system that needs an efficient, compact 1A buck solution from a 6V to 42V source. When designing with this device, attention must be paid to the selection of the external Schottky diode (reverse voltage >= VIN(MAX) and average current >= IOUT), the inductor (sized for the chosen on-time and ripple target), and the input/output ceramic capacitors (X7R dielectric, low ESR). The exposed pad must be soldered to a sufficient copper pour to keep the junction temperature within safe limits at full load. According to TI datasheet SNVS428, the WSON-10 (DPR) package achieves a theta_JA of approximately 40 C/W on a standard 4-layer JEDEC test board. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on any single manufacturer or distributor page, including a verified same-package cross-reference set and a side-by-side parameter table for the most common substitution candidates.
LM25011MYX/NOPB - 42V 2A Buck Regulator | Texas Instruments
The LM25011MYX/NOPB is a constant on-time (COT) step-down switching regulator from Texas Instruments delivering up to 2A of output current from a wide 6V to 42V input range, housed in a 10-pin HVSSOP (DGQ) package measuring 3 mm x 4.9 mm. It integrates an N-Channel buck switch, startup regulator, current limit detection, and internal ripple control for a low-cost, efficient buck bias regulator. A buck converter, or step-down regulator, is a DC-DC switching converter that efficiently reduces a higher input voltage to a lower regulated output using a switching element and an LC filter. Unlike linear regulators, buck converters achieve high efficiency even at large input-to-output voltage differences, making them fundamental building blocks in power management IC hierarchies. The LM25011 belongs to the constant on-time regulator family, which regulates by controlling the high-side switch on-time without requiring loop compensation. Key features include the 6V to 42V input operating range with 45V absolute maximum rating, adjustable output from 2.51V to 40V, and 2A load capability. The COT control scheme provides fast transient response with no external compensation network. An adjustable current limit, set via an external resistor, lets designers tailor the peak switch current, while thermal shutdown protects against fault conditions. Technically, the on-time is inversely proportional to input voltage, keeping switching frequency nearly constant across the input range. The internal high-side N-channel MOSFET minimizes conduction losses, and a precision feedback comparator ensures accurate regulation up to 2 MHz operation per datasheet specifications. Typical applications include industrial power supplies, automotive bias rails (with the AEC-Q100 qualified LM25011-Q1 variant), telecom equipment, and 12V/24V distributed bus point-of-load conversion powering microcontrollers and sensors. Design tip: select the inductor and output capacitor per the datasheet design equations, set the current limit resistor above maximum load current, and use short PCB traces with solid ground planes to minimize parasitic inductance.