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UCC28600TDRQ1 - 8-Pin Quasi-Resonant Flyback Green-Mode Controller | Texas Instruments
The Texas Instruments UCC28600TDRQ1 is an automotive-grade (AEC-Q100) 8-pin quasi-resonant flyback green-mode controller in an 8-SOIC package, switching at 40 kHz to 130 kHz across an 8 V to 32 V input range and dissipating 650 mW maximum. It targets isolated and non-isolated AC/DC adapters, LED drivers, and auxiliary supplies where world-wide energy efficiency standards must be met without compromising EMI performance. A quasi-resonant flyback controller is a current-mode PWM controller that switches the MOSFET at the drain-voltage valley rather than at a fixed frequency. This valley-switching technique (also called valley-skipping or QR operation) reduces switching losses, lowers EMI emissions, and improves light-load efficiency compared with conventional hard-switched flyback designs. Within the broader power-supply hierarchy, it sits between the bridge rectifier/PFC front end and the isolated transformer secondary, governing energy transfer during each switching cycle. Key features of the UCC28600TDRQ1 include quasi-resonant mode operation for reduced EMI and low switching losses, a green-mode controller with advanced energy-saving features, frequency foldback at light load, low standby current, and over-temperature/over-current protection. The -Q1 suffix denotes AEC-Q100 Grade 1 automotive qualification, supporting under-the-hood and infotainment applications that demand -40 °C to +105 °C operation. The internal high-voltage startup and frequency-jitter block minimize external component count, enabling a compact, low-BOM-count adapter. Internally, the device combines a current-mode control loop, a valley-detection comparator, a programmable minimum-frequency clamp, and a soft-start sequencer. The result is a controller that adapts its switching frequency to the instantaneous load: at heavy load the converter operates near 130 kHz at the drain valley; at light or no load it folds back to 40 kHz or lower to maintain efficiency. According to TI design calculator SLVC104, the loop compensation, transformer turns ratio, and primary inductance are jointly optimized around the UCC28600 to achieve >85 % average efficiency. Typical applications include smartphone and tablet AC/DC adapters (5 W to 65 W), notebook laptop chargers, standby/auxiliary supplies in LCD TVs and white goods, LED lighting drivers, and automotive 12 V battery-powered systems such as USB chargers and infotainment rails. Any flyback topology where world-wide energy standards (DoE Level VI, CoC Tier 2, ENERGY STAR) apply is a strong candidate. When designing with the UCC28600TDRQ1, the primary-side MOSFET's drain-voltage ringing must remain within the controller's valley-detection window; otherwise the converter will hard-switch and lose its EMI advantage. Use the SLVC104 design calculator to size the primary inductance and transformer turns ratio, and follow TI's reference layout to keep the drain-sense trace short and well-shielded. This page synthesizes distributor pricing, AEC-Q100 alternatives, drop-in package equivalents, and practical flyback design notes not found in the standalone manufacturer datasheet.
UCC28730-Q1 - PSR Flyback Controller, 5mW Standby | TI
The Texas Instruments UCC28730-Q1 is an automotive-qualified (AEC-Q100), zero-power standby primary-side regulation (PSR) flyback controller providing constant-voltage (CV) and constant-current (CC) output regulation without an optocoupler. It is supplied in a 7-pin SOIC (D) package and operates over a switching frequency range of 32 Hz to 83 kHz. A flyback controller is a switching power supply controller used in isolated DC-DC converters. It regulates output voltage and current by switching the primary-side MOSFET, transferring energy through a coupled inductor to the secondary. Primary-side regulation (PSR) senses the output via an auxiliary flyback winding, eliminating the optocoupler feedback circuit - reducing component count, improving reliability, and lowering standby power within the power management IC hierarchy. Key features include support for wide input ranges from 40 V to 1000 V DC via appropriate transformer and switch selection, a minimum switching frequency of 30 Hz that enables less than 5 mW no-load standby power, and wake-up signal detection that improves transient response to large load steps. A frequency dithering function reduces EMI for easier conducted-emissions compliance. Technically, the device uses a proprietary algorithm processing information from the primary power switch current-sense signal and an auxiliary flyback winding to precisely control output voltage and current. Integrated protections include overvoltage, overcurrent, and overtemperature shutdown. AEC-Q100 qualification and a -40C to +150C junction operating range ensure reliable operation in harsh automotive environments such as traction inverters and on-board chargers. Typical applications include traction-inverter isolated bias supplies, on-board charger (OBC) auxiliary rails, and industrial isolated auxiliary power. A TI reference design delivers an isolated 15 V output at 0.33 A from 40-250 VDC input and 1 A from 250-550 VDC input. Design tip: ensure tight auxiliary-to-secondary winding coupling for regulation accuracy, and place the current-sense resistor and snubber close to the IC to minimize parasitic inductance and EMI.
UCC28950 - Green Phase-Shifted Full-Bridge Controller | Texas Instruments
The Texas Instruments UCC28950 is a Green phase-shifted full-bridge controller with synchronous rectification control, housed in a 24-pin TSSOP (PW) package. It supports input voltages up to 100 V and integrates adaptive zero-voltage-switching (ZVS) control across the full load range, making it suitable for high-efficiency isolated DC/DC converters. The controller combines peak current-mode control with programmable switching frequency up to 1 MHz. A phase-shifted full-bridge controller is a type of isolated DC/DC switching controller that drives four primary MOSFETs in a full-bridge topology with controlled phase shift between the two half-bridges to regulate output power. It belongs to the broader power management IC family, specifically the isolated DC/DC converter controller category, and sits between non-isolated buck/boost controllers and resonant LLC controllers in the converter hierarchy. Key features include programmable dead time for ZVS optimization, soft-start with programmable timeout, cycle-by-cycle current limiting, and synchronous rectifier output control with turn-on/turn-off delay adjustment. The device also integrates a high-voltage internal LDO for VCC bias and supports burst-mode operation for light-load efficiency, which is critical for meeting energy efficiency standards such as 80 PLUS and ENERGY STAR. Architecturally, the UCC28950 uses a peak current-mode control loop with input voltage feed-forward, enabling excellent line transient response without requiring additional compensation networks. The integrated synchronous-rectifier control eliminates the need for an external SR controller, reducing BOM cost in half-bridge and full-bridge secondary-side rectification designs. Typical applications include 48 V telecom isolated bus converters, server and data-center power supplies, industrial battery chargers, renewable-energy inverters, and high-power-density point-of-load front ends. The wide input range and high efficiency make it a strong fit for any application requiring an isolated high-current DC/DC stage. When designing with the UCC28950, careful attention must be paid to dead-time and resonant tank component selection to maintain ZVS across the load range. The UCC28951 drop-in replacement offers improved light-load efficiency and is recommended for new designs where backward compatibility is not required. This page synthesizes manufacturer datasheet parameters, distributor pricing and inventory, drop-in alternatives, and engineering design notes not found in the manufacturer datasheet alone.
UCC28C42DR - 20V 1A Current-Mode PWM Controller | TI
The Texas Instruments UCC28C42DR is a high-performance, low-power current-mode PWM controller designed for DC-DC switching power supply applications. It belongs to the UCCx8C4x BiCMOS family, which offers pin-for-pin compatibility with the industry-standard UCx84xA and UCx84x PWM controller families, allowing direct upgrades in existing designs. The device is supplied in an 8-pin SOIC (D) package for industrial temperature ranges. A current-mode PWM controller is an integrated circuit that regulates switching power supply output voltage by controlling the duty cycle of a power switch based on both the voltage error signal and the inductor current. Compared with voltage-mode controllers, the dual-loop current-mode architecture provides better line and load regulation, inherent cycle-by-cycle overcurrent protection, and simpler loop compensation. Current-mode controllers are the standard choice in AC-DC adapters, flyback converters, and isolated power supplies. Key features include a 20V supply voltage rating, 1A peak gate-drive output current, and a maximum switching frequency of 1000 kHz. The UCC28C42 version provides a 14.5V startup (on) and 9V minimum operating (off) UVLO threshold with 100% duty cycle capability. BiCMOS technology reduces startup and operating current, improving efficiency over bipolar predecessors while supporting faster current-sense and oscillator operation. Internally, the device integrates a precision oscillator (programmable via RT/CT components), an error amplifier, a current-sense comparator, a 5V reference (2% accuracy), and a totem-pole output driver. Cycle-by-cycle current limiting protects the external MOSFET during faults. Typical applications include flyback converters, boost converters, and forward converters in industrial power supplies, telecom auxiliary rails, and AC-DC adapters. Its low quiescent current suits off-line auxiliary supplies where standby efficiency matters. Design tip: keep current-sense and gate-drive traces short to minimize parasitic inductance, place RT/CT timing components close to pin 4, and add at least 0.1uF of bypass capacitance at VCC. Pricing as of 2026-08-29.
UCC28C42QDRQ1 - 1MHz Automotive Current-Mode PWM | Texas Instruments
The Texas Instruments UCC28C42QDRQ1 is an AEC-Q100 qualified, automotive-grade, BiCMOS low-power current-mode PWM controller in an 8-pin SOIC (D) package. It implements a fixed-frequency, peak current-mode flyback control scheme with UVLO options and maximum duty-cycle limits, delivering up to 1 MHz switching frequency from a 9V~18V supply range. A current-mode PWM controller is a switching power-supply control IC that regulates converter output by comparing a cycle-by-cycle current-sense ramp against an error-amplifier output, providing inherent cycle-by-cycle current limiting, good line transient response, and simple loop compensation compared to voltage-mode control. Within the power-management hierarchy, the UCC28C4x-Q1 family sits as an off-line/isolated converter controller feeding external power MOSFETs in flyback and forward topologies. Key features include a maximum switching frequency of 1 MHz (1000 kHz), enabling smaller transformer and magnetics designs; BiCMOS technology for low startup and quiescent current, improving light-load efficiency; and pin-for-pin compatibility with the industry-standard UCx84xA/UCx84x PWM controller family, simplifying upgrades from legacy designs. The controller supports both primary-side regulation with an auxiliary winding and secondary-side regulation using an opto-coupler, giving designers topology flexibility. The BiCMOS process combines fast current-sense and oscillator circuitry with low power consumption, making the device well suited to standby-power-sensitive designs. UVLO thresholds and duty-cycle limit options across the UCC28C4x-Q1 family let designers select the appropriate start/stop window for their bias architecture. Typical applications include automotive AC-DC auxiliary power supplies, isolated flyback converters for infotainment and cluster bias rails, USB charger and ADAPTER power stages, and industrial auxiliary supplies where a robust, proven controller topology is required. The automotive qualification (AEC-Q100) and RoHS compliance target OEM vehicle electronics. Design consideration: verify UVLO thresholds against the selected family member and design the transformer for peak current limit; at 1 MHz keep gate-drive and current-sense loop layout short to preserve cycle-by-cycle accuracy. According to the TI UCC28C42-Q1 datasheet (46 pages), maximum duty cycle and UVLO options vary across UCC28C43/44/45 variants.
UCC33020QWRHBRQ1 - 1W Isolated DC/DC Module | TI Automotive
The Texas Instruments UCC33020QWRHBRQ1 is an automotive-qualified DC/DC power module with integrated transformer technology, designed to deliver 1.0W of isolated output power. It operates from a 3.0V to 5.5V input and provides a regulated 5.0V output with a selectable headroom of 5.5V, supporting up to 200mA of load current. The device achieves a 3kVRMS isolation rating using a proprietary transformer architecture, making it ideal for space-constrained and high-voltage applications where traditional transformers are bulky and expensive. A DC/DC power module is a complete power supply solution that integrates the controller, power switches, and often the transformer or inductor into a single package. This integration simplifies design, reduces board space, and improves reliability compared to discrete solutions. In the hierarchy of power management, a DC/DC module is a type of power converter, which falls under power management ICs, ultimately part of the broader semiconductor category. The UCC33020-Q1 specifically targets isolated power delivery, a critical function in systems requiring galvanic isolation for safety or noise immunity. Key features include 1.0W maximum output power, 3.0V to 5.5V input range, selectable 5.0V or 5.5V output, 0.5% typical load regulation, and 4mV/V typical line regulation. The integrated transformer provides 3kVRMS isolation, eliminating the need for external magnetics. The device is AEC-Q100 qualified for automotive applications, ensuring robust performance across temperature extremes. Its ultra-small package (VQFN-20) and high integration make it suitable for space-limited designs. Technically, the UCC33020-Q1 uses a proprietary transformer architecture that enables high isolation in a compact footprint. The module includes all necessary control circuitry, reducing external component count. The selectable output headroom allows designers to optimize for either lower power loss (5.0V) or higher voltage margin (5.5V). The device also features robust protection mechanisms, including overcurrent and thermal shutdown, ensuring reliable operation in harsh environments. Typical applications include isolated power supplies for IGBT/SiC gate drivers in automotive traction inverters, isolated sensor interfaces, and auxiliary power rails in battery management systems. Its 3kVRMS isolation and 1W output make it ideal for powering high-side gate drivers and isolated communication interfaces. The module's small size and integrated transformer are particularly beneficial in electric vehicle (EV) and hybrid electric vehicle (HEV) powertrains where board space is at a premium. When designing with this device, ensure adequate input and output capacitance to maintain stability and meet transient requirements. The selectable output headroom should be chosen based on the downstream load's voltage tolerance. Also, consider the thermal performance of the VQFN-20 package; while the module is efficient, proper PCB layout with thermal vias is recommended for high ambient temperature operation.
UCC33410-Q1 - 1W 3kVRMS Isolated DC/DC Module | Texas Instruments
The Texas Instruments UCC33410-Q1 is an automotive-qualified, 1.0W isolated DC/DC power module with integrated transformer technology, operating from a 4.5V to 5.5V input and delivering a regulated 3.3V output in a miniaturized VSON 4mm x 5mm package with 1mm profile height. An isolated DC/DC power module is a power management IC that integrates a transformer, power switches, controller, and rectification into a single package, providing galvanic isolation between input and output circuits. Isolation is essential in industrial and automotive systems to break ground loops, protect low-voltage logic from high-voltage domains, and safely power gate drivers and transceivers that sit on the isolated side of the barrier. The UCC33410-Q1 occupies the module level of the power-conversion hierarchy: power management IC -> DC/DC converter -> isolated DC/DC module. Key features include 1.0W maximum output power, a proprietary integrated transformer architecture rated at 3kVRMS isolation, 0.5% typical load regulation, and 4mV/V typical line regulation. An enable pin with fault reporting, short-circuit protection, and thermal shutdown provide robust operation in demanding environments. Technically, the integrated transformer technology removes the need for an external magnetic component, which traditionally dominates the footprint of isolated bias supplies. The tight coupling of the planar transformer enables excellent regulation without optocoupler feedback, improving reliability since optocouplers degrade with age. Low EMI behavior simplifies compliance in automotive EMC testing. The low 1mm height and greater than 4.1mm creepage and clearance suit space-constrained, safety-relevant designs. Typical applications include isolated gate-driver bias supplies for SiC and IGBT inverters, isolated power for CAN and RS-485 transceivers in automotive body and powertrain domains, and auxiliary rails for isolated sensing and industrial field-side electronics. Design-wise, keep the input well decoupled and respect the 4.5V minimum input to preserve regulation; the output headroom specification should be reviewed against downstream load requirements. This page adds information gain beyond the datasheet: distributor-context pricing tiers, same-footprint alternatives, comparison tables, and practical design notes synthesized in one place.
UCC33420 - 1.5W Isolated DC/DC Module 3kVRMS | Texas Instruments
The Texas Instruments UCC33420 is an industrial DC/DC power module with integrated transformer technology, designed to provide 1.5W of isolated output power. It operates from a 4.5V to 5.5V input and regulates a 5.0V output with a selectable headroom of 5.5V, delivered in a miniaturized, low-profile VSON (4.00mm x 5.00mm) package with 1.00mm height and >4.1mm clearance and creepage. An isolated DC/DC converter is a power conversion module that provides galvanic isolation between input and output, preventing DC current flow while transferring power across a safety barrier. It sits within the power management IC hierarchy and is essential in systems requiring safety isolation, ground-loop elimination, or noise isolation, such as industrial automation, medical devices, and automotive electronics. The UCC33420 integrates the transformer and power stage in a single package, reducing board space versus discrete transformer-plus-driver solutions. Key features include a proprietary transformer architecture achieving a 3kVRMS isolation rating with low EMI and excellent load regulation of 0.5% typical and line regulation of 4mV/V typical. Integrated protection features include an enable pin with fault reporting mechanism, short circuit protection, and thermal shutdown, increasing overall system robustness. Technically, the UCC33420 uses integrated transformer technology in a multichip module, which minimizes parasitic inductance, improves EMI performance, and achieves high power density. The selectable 5.0V/5.5V output headroom supports driving isolated gate-driver rails, with 300mA available load current per DigiKey listing (200mA at 5.0V per datasheet feature listing for the 1.0W variant). Typical applications include isolated bias supplies for IGBT and SiC gate drivers, industrial fieldbus transceiver power, isolated sensor interfaces, and automotive isolated rails when using the UCC33420-Q1 variant. Design tip: maintain the >4.1mm clearance and creepage on the PCB layout and place input/output capacitors close to the package pins to preserve low-EMI performance.
UCC34141-Q1 - 1.5W 5kVRMS Isolated DC/DC Module | TI
The Texas Instruments UCC34141-Q1 is an automotive-qualified, fully integrated isolated DC/DC power module designed to provide bias power to SiC and IGBT isolated gate drivers. It integrates a high-density planar transformer and isolated power stage in a single 16-SO-MOD package, delivering up to 1.5W of regulated output power with reinforced isolation rated above 5kVRMS. Input range is 5.5V to 20V with 22V overvoltage lockout (OVLO). An isolated DC/DC converter is a power conversion circuit that produces a regulated output while maintaining galvanic isolation between input and output grounds. Isolation is essential where safety standards or large ground-potential differences demand separation, such as gate-driver bias for high-voltage SiC and IGBT switches. The UCC34141-Q1 belongs to the isolated power module family, which integrates transformer, switching elements, and control into one package, cutting board space and system BOM versus discrete flyback designs. Key features include TIs proprietary integrated planar transformer with IsoShield multichip packaging, wide input range with at least 0.6W typical output for 6V to 7V VIN and at least 0.5W at VIN = 5.5V (TA up to 85C), and regulated dual outputs - typically VDD = 18V and VEE = -5V - sensed through FBVDD and FBVEE feedback pins for precise gate-driver bias. The high power density and low-noise control architecture eliminate bulky external isolation transformers, making the part especially attractive in very-high-voltage applications where isolation-rated transformers are large and expensive. The module is AEC-Q100 qualified and operates from -40C to +125C for harsh automotive and industrial environments. Typical applications include isolated bias supplies for SiC/IGBT gate drivers in automotive traction inverters, on-board chargers, DC fast-charging infrastructure, and industrial motor drives. Design tip: maintain PCB creepage/clearance around the isolation barrier and provide thermal copper area, since the module dissipates power internally. The UCC34141EVM-116 evaluation module supports this part and accepts the pin-to-pin 2W variant UCC35341-Q1 for higher power needs.
UCC3809P-2 - Economy Primary Side PWM Controller, 8-VSSOP | TI
The Texas Instruments UCC3809P-2 is a BCDMOS economy low-power primary-side PWM controller for off-line and isolated DC-to-DC fixed-frequency current-mode switching power supplies, housed in an 8-pin VSSOP (DGK) package. It integrates a user-programmable soft start, user-programmable maximum duty cycle, a 5V internal reference accessible on a pin, undervoltage lockout (15V/8V thresholds for the -2 option), and a 0.4A source / 0.8A sink FET driver. Operating frequency is user-programmable up to 1 MHz with a low 100 uA startup current. A primary-side PWM controller (also called a current-mode controller) is the IC that regulates a switching power supply by sensing the current through the primary winding of a flyback or forward transformer on each switching cycle and modulating the duty cycle of the main power switch (typically a MOSFET). This forms a tight inner current loop nested inside a slower outer voltage loop, providing inherent line-cycle-by-cycle current limiting and excellent input-voltage transient response. Within the broader hierarchy, the UCC3809P-2 belongs to Power Management > DC-DC Converters > PWM Controllers > Current-Mode Controllers > Primary-Side Controllers. Key differentiating features include a logic-level shutdown pin, accessible 5V reference that doubles as a low-power supply rail for housekeeping circuits, and BCDMOS process technology that allows the high-side driver output to swing close to the VDD rail. The -2 UVLO variant turns on at 15V and off at 8V, leaving a 7V hysteresis window that accommodates slow VDD rise in bias-wound flyback designs. Maximum duty cycle is set by a single resistor, eliminating the need for a separate oscillator timing capacitor divider. Typical applications include AC-DC adapters (5W-50W class), isolated DC-DC modules in industrial 24V bus systems, auxiliary supplies in motor drives, bias supplies for telecom line cards, and low-cost standby converters. The wide VDD range and small VSSOP-8 footprint suit designs where PCB area is constrained and a tiny primary-side controller is preferred over a fully integrated flyback solution. Design tip: When designing the VDD bias network, ensure the auxiliary winding and rectifier can deliver VDD above 15V at all load conditions but clamp transients below the absolute maximum (typically 18V). Add a small RC snubber on VDD if ringing exceeds the abs-max. The shutdown pin is active-low and may be tied to VREF through a resistor divider if unused. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found on TI's standalone UCC3809-2 product page.
UCC5310MCDR - 4.3A Isolated Gate Driver, 3kVrms, SOIC-8 | Texas Instruments
The Texas Instruments UCC5310MCDR is a single-channel isolated gate driver with 4.3 A source and 2.2 A sink drive capability, integrated Miller clamp, and 3 kVrms basic galvanic isolation, housed in an 8-pin SOIC (D) package. It is designed to drive power MOSFETs, IGBTs, SiC MOSFETs, and GaN FETs in compact, high-efficiency switching power stages. An isolated gate driver is a device that provides both signal-level galvanic isolation and high-current buffering between a low-voltage PWM controller and the gate of a high-voltage power transistor. Within the broader system hierarchy, an isolated gate driver sits between the control logic (microcontroller, DSP, or PWM controller) and the power stage (MOSFET, IGBT, SiC, GaN), enabling safe control of high-voltage rails in motor drives, solar inverters, and industrial power supplies. Key features of the UCC5310MCDR include 4.3 A peak source / 2.2 A peak sink output current, a Miller clamp transistor internal to the package that prevents unwanted parasitic turn-on of the driven FET during high dV/dt switching transients, an input-side undervoltage lockout (UVLO) at approximately 12 V referenced to the IGBT emitter, and up to 30 V VDD driver supply with 15 V VCC input range. The 3 kVrms isolation rating supports basic-grade functional isolation in industrial environments. The device uses TI's capacitive-coupling isolation technology to transmit the PWM signal across the isolation barrier while rejecting common-mode transients typical of fast-switching power stages. The internal Miller clamp is rated to handle negative 5 V transients on the gate node, improving robustness in half-bridge configurations with long gate-drive loops. Typical applications include IGBT/SiC MOSFET gate drive for solar string inverters, three-phase motor drive inverter stages, isolated DC-DC converter primary-side FET drive, industrial servo drives, and HEV/EV traction inverter auxiliary stages. The combination of integrated Miller clamp and 4.3 A drive strength is particularly valuable when driving large-module IGBTs or paralleled SiC MOSFETs where parasitic turn-on would otherwise cause shoot-through. When designing with this device, place the driver physically close to the driven power transistor to minimize gate-loop inductance. Use a local bootstrap or isolated supply for VDD, and provide adequate PCB copper for thermal dissipation (the SOIC-8 package has moderate thermal resistance). This page synthesizes distributor pricing, drop-in alternatives, comparison parameters, and practical design notes not found in the manufacturer datasheet alone.
UCC5320 - 4.3A Isolated Gate Driver | Texas Instruments
The Texas Instruments UCC5320 is a 4.3A single-channel isolated gate driver with 3-kVRMS or 5-kVRMS reinforced isolation, supporting MOSFET, IGBT, SiC MOSFET, and GaN FET switching in SOIC-8 (D) or wide-body SOIC-8 (DWV) packages. It features split output (UCC5320S variant) or emitter-referenced UVLO options for safe gate drive of power transistors in switching power supply and motor drive designs. A galvanically isolated gate driver is a gate drive circuit that uses an isolation barrier (capacitive or magnetic) to separate the low-voltage control domain (PWM logic, MCU) from the high-voltage power domain (MOSFET/IGBT gate). Isolation gate drivers sit in the power management IC hierarchy: isolated gate driver > gate driver > driver IC > power management IC. Their primary role is to break ground loops, provide level shifting, and protect low-voltage controllers from high-voltage transients propagated by rapidly switching power devices. The UCC5320 delivers up to 4.3A peak source and 4.5A peak sink gate drive current, with a wide drive supply range of 9.5V to 33V on the secondary side. The split output variant (UCC5320S) independently controls turn-on and turn-off currents, allowing designers to tailor switching loss and EMI. Internal undervoltage lockout referenced to GND2 ensures gate drive signals are only produced once the driver supply is healthy. The device is rated for -40C to +150C junction temperature. Architecturally, the UCC5320 uses TI's capacitive isolation technology to achieve 3-kVRMS (D package) or 5-kVRMS (DWV package) basic or reinforced isolation. The wide-body DWV package is intended for reinforced isolation per IEC 60747-17/VDE 0884-11. Internal common-mode transient immunity (CMTI) exceeds 100 kV/µs, ensuring reliable operation in noisy motor drive and Class-D audio amplifier environments. The basic isolation D variant shares the same pinout with the reinforced DWV variant, enabling PCB layout reuse between isolation grades. Typical applications include industrial motor drives (AC motor, BLDC, PMSM), photovoltaic string inverters, isolated DC-DC converters, EV traction inverters, and Class-D audio amplifiers. The split output variant is particularly valuable in motor drives where controlled dV/dt via gate resistance tuning is critical to manage EMI and switching loss. The wide 9.5V to 33V secondary supply range also allows direct drive of SiC MOSFETs requiring 18V gate drive. When designing with this device, ensure adequate decoupling on both primary (VDD1, 3V to 5.5V) and secondary (VDD2, 9.5V to 33V) supplies with 0.1 µF ceramic capacitors placed as close to the IC as possible. The split output (UCC5320S) needs separate turn-on and turn-off gate resistors if independent rise/fall time control is desired. Verify creepage and clearance on the PCB layout for the DWV package to achieve the rated 5-kVRMS reinforced isolation. This page synthesizes current distributor pricing, drop-in same-family alternatives, application circuit notes, and design considerations beyond the manufacturer datasheet, helping engineers select and source the right UCC5320 variant for their isolated gate drive needs.
UCC5350-Q1 - 10A Isolated Gate Driver | TI | SiC/IGBT/MOSFET
The Texas Instruments UCC5350-Q1 is a single-channel, automotive-qualified isolated gate driver with 10 A source and 10 A sink typical peak output current, housed in an 8-pin SOIC (D) package with 3 kVRMS basic isolation. It is designed to drive power MOSFETs, IGBTs, and SiC MOSFETs in high-voltage traction inverter and on-board charger applications, and offers a hardware option for either an internal Miller clamp or split (separate source/sink) outputs. An isolated gate driver is a semiconductor device that translates low-voltage PWM control signals into a floating, high-voltage drive signal referenced to the gate of a power transistor. Isolated gate drivers sit in the signal chain between a low-voltage controller (MCU, DSP, or digital isolator) and the gate of a high-side or low-side power switch, and they form part of the broader power management hierarchy: gate driver -> driver IC -> isolated driver -> isolated power stage. Capacitive-isolation techniques, as in the UCC5350-Q1, replace optocouplers to deliver lower part-to-part skew, lower propagation delay, higher CMTI, and improved automotive temperature performance. Key features include 5 A minimum source/sink peak current (10 A typical), 3 kVRMS reinforced isolation, 100 V/ns minimum CMTI, propagation delay below 100 ns, and a 8 V to 18 V VDD drive supply range. The Miller-clamp variant integrates a low-impedance path that prevents parasitic turn-on during high dv/dt transients, while the split-output variant gives the gate-drive circuit independent control of turn-on and turn-off impedance for tunable EMI and switching loss. The device integrates a TI proprietary capacitive isolation barrier based on silicon-dioxide capacitors, achieving >30 year isolation barrier life and 5 kVRMS transient withstand. Input-to-output channel matching and minimal pulse-width distortion make the UCC53553 well suited to closed-loop current-control topologies such as field-oriented control (FOC) of traction inverters, where phase-edge timing accuracy directly impacts torque ripple and acoustic noise. Typical applications include EV traction inverters, on-board chargers (OBC), DC fast-charging station power modules, solar/string inverters, industrial motor drives, and server/telecom SMPS. AEC-Q100 Grade 1 qualification (–40C to +125C) and functional-safety-capable design files (TI documents FMEDA) make it well suited to ASIL-rated safety functions such as inverter over-current protection. When designing with the UCC5350-Q1, place a 1 uF VDD bypass capacitor within 2 mm of the IC and use a 4.7 uF to 10 uF bulk capacitor on the VCC supply. Add a gate-source resistor of 10 kohm to prevent floating-gate leakage during MCU reset, and follow PCB layout rules that keep the input-side and output-side grounds separate (single-point star ground at the isolation barrier). This page synthesizes distributor pricing, AEC-Q100-qualified same-package drop-in alternatives, and practical gate-drive design notes not found on stock distributor listings.
UCC5390ECD - 10A Isolated Gate Driver, 3kVrms, 8-SOIC | TI
The Texas Instruments UCC5390ECD is a single-channel, isolated gate driver rated for 10 A source and 10 A sink output current, with 3 kVrms basic isolation (5 kVrms option on the family), housed in an 8-pin SOIC (D) package. It is designed for high-performance MOSFETs, IGBTs, SiC MOSFETs, and GaN FETs in switching power topologies such as motor drives, solar inverters, and on-board EV chargers. An isolated gate driver is a critical power-management component that sits between a low-voltage control controller (microcontroller, FPGA, or DSP) and a high-voltage power transistor. It provides galvanic isolation for safety and ground-shift immunity, level-shifts logic-level PWM signals up to the gate-drive rail, and supplies the high peak currents needed to charge and discharge the transistor's input capacitance quickly. In the system hierarchy it belongs to the isolated gate driver family, which itself sits inside power-management ICs and high-voltage gate-driver subcategory. Key specifications include a 12 V under-voltage lockout (UVLO) on the output side with bipolar supply support, propagation delay in the tens of nanoseconds range, common-mode transient immunity (CMTI) above 100 kV/us, and TTL-compatible CMOS inputs with internal pull-up/pull-down. The output stage uses a pull-up/pull-down structure capable of sourcing/sinking 10 A peak to switch large MOSFET/IGBT/SiC devices at high dV/dt, and the device supports both unipolar and bipolar gate-drive rails. Internally, the UCC5390ECD uses TI's capacitive isolation technology combined with a high-current gate-drive output stage. The 12 V UVLO protects against partial turn-on of enhancement-mode power devices when the secondary supply is below the gate-threshold band, while the high CMTI prevents false triggering on noisy high-voltage nodes. Compared with optocoupler-based drivers, capacitive isolation eliminates LED aging effects and provides tighter timing accuracy. Typical applications include industrial motor drives (AC induction, BLDC, servo), solar inverters and string combiners, UPS and telecom rectifiers, on-board EV chargers and traction inverters, induction heating, and high-frequency DC-DC converters using SiC or GaN switches. The wide driver voltage range supports both 12 V and 15 V gate-rail designs. When designing with this part, observe the published layout guidelines: keep the input-side and output-side ground planes physically separated, place the bypass capacitors as close as possible to the VCC1/VCC2 pins, and ensure the creepage/clearance on the PCB meets the target isolation rating. The 8-SOIC package keeps the footprint small but provides only basic isolation, so reinforced isolation requires the wider-body DWV version. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
UCC5390ECDR - 10A Isolated Gate Driver, 3kVrms, SOIC-8 | TI
The Texas Instruments UCC5390ECDR is a single-channel isolated gate driver with 10A/10A source/sink drive capability, 3 kVRMS basic isolation, and a 12V UVLO option, housed in an 8-pin SOIC (D) package. It uses TI's capacitive coupling isolation technology to provide robust switching for high-performance MOSFETs, IGBTs, and SiC MOSFETs in demanding power-conversion applications. An isolated gate driver is a specialized driver IC that provides both galvanic isolation and high-current drive signals to the gate of a power semiconductor. It sits hierarchically between a low-voltage PWM controller (signal-level logic) and a high-voltage power switch (MOSFET/IGBT/SiC), combining the functions of an isolation barrier (replacing optocouplers or pulse transformers) and a high-peak-current gate driver. Without it, a logic-level MCU cannot safely or directly switch a high-current power FET that may switch hundreds of volts. Key features include 10A peak source and 10A peak sink output current, 3 kVRMS basic isolation rating per UL 1577, common-mode transient immunity (CMTI) of 100 kV/us minimum, and an 8-pin SOIC (D) footprint with 0.7 mm creepage. The split output stage (separate OUTH and OUTL pins) allows independent turn-on and turn-off strength tuning, and the device supports bipolar supply operation up to +18/-13 V for IGBT and SiC applications. The 12V UVLO references GND, while the part also carries safety certifications including UL 1577 and VDE 0884-11. The UCC5390 uses TI's integrated capacitive isolation barrier with on-chip modulation/demodulation, eliminating the current-driven optocoupler lifetime concerns of LED-based isolators. Its split output topology lets the designer add discrete source/sink resistors to optimize dV/dt and EMI, which is critical when driving SiC MOSFETs at >50 V/ns to keep switching losses low. Typical applications include solar string inverters, industrial motor drives, telecom and server power supplies, and EV onboard chargers. The 3 kVRMS rating suits 400V/600V/650V DC-link systems; the bipolar supply capability is critical for SiC MOSFETs that need a negative gate-off voltage to avoid spurious turn-on from high dV/dt. When designing with this part, treat creepage/clearance on the PCB as the primary safety constraint. Above 1.5 kVRMS the SOIC-8 needs at least 4 mm side-to-side trace spacing and the inner PCB layers must be routed away from the isolation barrier to meet IEC 62368-1 reinforced isolation reinforcement. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone.
UCC5880-Q1 - Isolated 20A Adjustable SiC/IGBT Gate Driver | TI
The Texas Instruments UCC5880-Q1 is an isolated, highly configurable 20A adjustable drive-strength gate driver designed to drive high-power SiC MOSFETs and IGBTs in automotive EV/HEV applications. Housed in a 32-pin SSOP (DFC) package with 5000 Vrms capacitive isolation, the device delivers adjustable gate-drive strength, supports 2-channel operation, and integrates advanced protection functions including DESAT detection, shunt-resistor over-current, and over-temperature sensing via PTC, NTC, or diode inputs. What is an isolated gate driver? An isolated gate driver is a power-management interface IC that provides galvanic isolation between a low-voltage control domain (MCU, DSP, or FPGA) and a high-voltage power-transistor stage (IGBT, SiC MOSFET, or GaN FET). Compared with non-isolated gate drivers, isolated gate drivers - including the UCC5880-Q1 - use capacitive or magnetic barriers to block high-voltage transients, allowing the control circuit to float at a separate domain and enabling directly-referenced gate drive for high-side switching in half-bridge and full-bridge power stages. They sit in the broader hierarchy of gate driver IC -> power management IC -> semiconductor IC. The UCC5880-Q1's adjustable drive-strength feature lets the system engineer tune the gate-source current for the specific switching speed required, mitigating EMI and ringing without external gate resistors. Built-in protection includes programmable soft turn-off or two-level soft turn-off during DESAT and over-current faults, plus over-temperature shutdown, dramatically reducing the burden on the host MCU. Functional Safety-Compliant design and AEC-Q100 qualification make the UCC5880-Q1 attractive for traction inverters, onboard chargers, and DC-DC converters in xEV platforms. Internal 32-SSOP package, tight parameter specification, and TI's reference design TIDT356 (HybridPACK IGBT module driver) demonstrate mature field readiness. Typical applications include traction inverter power stages using SiC MOSFETs, EV onboard chargers, and industrial servo drives. The UCC5880-Q1 also serves in DC fast-charging station PFC stages, where galvanic isolation is mandated between control and power stages. Its high drive strength eliminates external buffer stages on 1200V-class SiC discrete modules, simplifying layout. Design tip: pair the UCC5880-Q1 with the TI LM5180-Q1 isolated bias supply to build a complete isolated gate-drive bias rail in the TIDT356 HybridPACK reference design. Adjust drive strength via SPI/registers to match the target MOSFET's Qg. This page synthesizes distributor availability, drop-in alternatives (notably the pin-to-pin-compatible UCC5881-Q1), and design notes beyond the TI datasheet, helping engineers choose validated second sources for automotive production ramps.
UCC5881-Q1 - 20A Isolated SiC/IGBT Gate Driver | Texas Instruments
The Texas Instruments UCC5881-Q1 is an automotive-grade, isolated 20 A adjustable gate driver designed to drive high-power SiC MOSFETs and IGBTs in EV/HEV traction inverter applications. It integrates capacitive isolation rated at 5000 Vrms and is offered in a 32-pin SSOP (DFC) package with exposed thermal pad. The device provides real-time variable drive strength via an SPI-programmable interface, allowing designers to tune gate current profiles for each switching event. An isolated gate driver is a power-semiconductor interface IC that combines galvanic isolation with high-current gate drive capability, allowing a low-voltage controller to safely command a high-voltage power switch. Isolated gate drivers sit hierarchically between gate drivers and isolated power modules; in EV traction inverters they bridge the 12 V domain MCU and the 400 V or 800 V DC bus, enabling functional-safety-compliant drive of SiC MOSFETs and IGBTs at MHz-class switching frequencies. Key features include 14 selectable DESAT leading-edge blanking settings, 5 DESAT deglitch filter settings, and 16 DESAT threshold settings for configurable short-circuit protection. The device also integrates shunt-resistor-based over-current detection, over-temperature sensing (PTC, NTC, or diode), two-level soft turn-off during faults, an integrated 10-bit ADC, and ASIL-compliant diagnostics. Compared with the predecessor UCC5880-Q1, the UCC5881-Q1 adds more DESAT configurability and an INT_COMM fault filter while remaining pin-to-pin compatible. Technically, the UCC5881-Q1 uses TI's proprietary capacitive-isolation technology to deliver 5000 Vrms reinforced isolation. The 20 A adjustable drive strength reduces switching losses by up to 80 percent versus fixed-strength drivers, and the integrated ADC enables closed-loop temperature and current telemetry directly to the MCU. Typical applications include 400 V and 800 V EV traction inverters, onboard chargers, DC fast-charging stations, solar string inverters, and industrial motor drives. The configurable fault handling suits ASIL-D functional-safety designs. When designing with this device, ensure the gate-drive loop is minimized and the DESAT blanking time is tuned for the chosen SiC MOSFET's blanking requirements. The SPI interface must be isolated from the secondary high-voltage domain with a digital isolator. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet, providing engineering information for EV powertrain and renewable-energy power-conversion designers.
UCD3138 - Digital Controller for Isolated Power | Texas Instruments
The Texas Instruments UCD3138 is a highly integrated digital power supply controller designed for isolated power conversion applications. It features three feedback loops and eight DPWM outputs, enabling precise digital control of complex power topologies such as LLC, phase-shifted full-bridge, and active clamp forward converters. The device operates from a 3.3V supply and is available in a 40-pin VQFN (6x6 mm) package, offering a compact solution for high-density power systems. A digital power controller is a specialized microcontroller that implements control algorithms in firmware rather than analog circuitry. It combines high-speed analog-to-digital converters (ADCs), digital pulse-width modulators (DPWMs), and a programmable state machine to regulate output voltage and current with high accuracy. In the power management hierarchy, the UCD3138 sits between the power stage (MOSFETs, transformers) and the system supervisor, providing closed-loop regulation and communication with a host processor. Key features of the UCD3138 include three independent feedback loops with dedicated error ADCs, eight DPWM outputs with 250 ps resolution, and an integrated ARM7TDMI-S processor core running at 31.25 MHz. The device also includes a 12-bit, 2 MSPS ADC for monitoring input/output voltages and currents, as well as PMBus and UART interfaces for telemetry and configuration. These features enable adaptive control, fault management, and efficiency optimization in real time. Technically, the UCD3138 employs a digital control architecture that replaces analog compensators with firmware-implemented PID or 2-pole/2-zero filters. This allows for advanced features such as feed-forward, nonlinear gain, and cycle-by-cycle current limiting. The device supports multiple communication protocols, including PMBus, which simplifies system integration and remote monitoring. Its flexible DPWM configuration supports interleaved and phase-shifted operation, making it suitable for multi-phase and bridge topologies. Typical applications include server and telecom power supplies, AC-DC adapters, and isolated DC-DC converters. The UCD3138 is particularly well-suited for high-efficiency, high-density designs where digital control enables precise regulation and fast transient response. For example, in a 1.5 kW LLC resonant converter, the UCD3138 can manage burst mode and light-load efficiency improvements. When designing with the UCD3138, careful attention must be paid to the analog front-end filtering and DPWM output buffering to minimize noise coupling. The device requires a clean 3.3V supply and proper decoupling on the VDDA and VDD pins. Additionally, firmware development is essential, as the control loop parameters must be tuned for the specific power stage.
UCD90160ARGCT - 16-Rail PMBus Sequencer & Monitor | Texas Instruments
The Texas Instruments UCD90160ARGCT is a 16-rail PMBus/I2C addressable power supply sequencer and system health monitor with ACPI support, housed in a 64-pin VQFN (RGC) 9x9 mm package. It samples all 16 voltage rails every 400 µs using a 12-bit ADC with a 2.5 V, 0.5% internal reference, supports up to four programmable undervoltage and overvoltage thresholds per monitor, and operates from a 3 V to 3.6 V supply with typical quiescent current of 50 mA. A power supply sequencer is a programmable controller that supervises the turn-on and turn-off order, voltage margin, and fault response of multiple DC rails in a complex system such as a server, FPGA SoM, or ATX-class board. By centralizing rail sequencing in one IC rather than discrete reset supervisors, designers replace glue logic, RC delay chains, and multiple supervisor ICs with one PMBus-programmable device, simplifying BOM and improving diagnostic visibility through the integrated system health telemetry interface. Key features include sequence control based on time, rail-dependency, and pin-dependency, ACPI support for desktop power-button S0/S3/S5 state coordination, a 100-pin-compatible scalable family (UCD90120A / UCD90124A / UCD90910 / UCD90160), and integration with the TI Fusion Digital Power Designer GUI. Black-box fault logging, margining, and closed-loop trim of downstream DC/DC converters are standard capabilities supported through the PMBus command set. The device integrates a 12-bit ADC and precision reference, fault-logging non-volatile memory, programmable GPIOs for PERST#, ENABLE, and PG_OUT behavior, and a JTAG/I2C/PMBus host interface. The architecture follows the UCD90xxx family: an embedded microcontroller runs sequencing state machines while a dedicated ADC front-end maintains 400 µs rail sampling independent of host interaction. The result is deterministic rail sequencing even when the system host is stalled during fault recovery. Typical applications include ATX/Server power sequencing for multi-rail processors, FPGA and SoC power-up coordination, industrial and telecommunications equipment with hot-swap controllers, and automated test platforms that require precise rail ordering and margin verification. ACPI support makes the part particularly natural in x86 system designs that need S3 suspend/resume state transitions. When designing with this device, plan for a 3.3 V auxiliary rail present at all times because the sequencer must remain alive before the main rails come up. Place the decoupling capacitor network (1 µF + 0.1 µF) within 5 mm of the AVDD pin and follow TI's RGC PCB layout guideline in the EVM user's guide to keep ADC readings clean across all 16 channels. This page synthesizes distributor pricing, drop-in cross-reference parts, and practical layout notes compiled from the manufacturer datasheet and TI EVM user's guide so engineers can quickly qualify the UCD90160ARGCT against alternative sequencers in the same package family.
UCD90320ZWST - 32-Rail PMBus Power Sequencer & System Manager | TI
The Texas Instruments UCD90320ZWST is a 32-rail PMBus-addressable power sequencer and system manager housed in a 169-ball NFBGA package measuring 12 mm x 12 mm with a 0.8 mm ball pitch. The device integrates 24 ADC channels (AMONx) that monitor power supply voltage, current, and temperature, plus 84 GPIO pins that can be configured as 8 digital monitors (DMONx) and additional general-purpose I/O. It supports sequencing, margining, and supervising up to 24 voltage rails plus 8 digital rails in complex multi-rail systems such as FPGA, ASIC, and processor power trees. A power sequencer is a specialized supervisory IC that orchestrates the turn-on/turn-off order, timing, and fault response of multiple voltage rails. In the hierarchy of power-management ICs, sequencers sit above simple voltage supervisors (single-rail reset/watchdog) and below PMBus-configurable digital power controllers. They translate high-level system events into coordinated rail-by-rail actions using logic expressions, timers, and PMBus commands. The UCD90320 adds closed-loop monitoring, fault logging, and non-volatile configuration to that role. Key features include flexible sequence-on and sequence-off dependencies based on delay time, Boolean logic, and GPIO triggers; full OV/UV/OC/UC/temperature/time-out/GPI-triggered fault detection; pin-selected rail states for up to 8 user-defined power states using 3 GPIs (supporting ACPI low-power modes); cascade-capable FAULT pin for synchronized fault responses across multiple devices; and on-chip non-volatile memory for configuration storage. The PMBus interface supports standard command set plus TI extensions for sequencing and fault response. Architecturally, the UCD90320 combines a Cortex-M0-class configuration manager with a 24-channel sigma-delta ADC front end, a dedicated sequencing state machine, and an I2C/PMBus slave interface. The 0.8 mm-pitch BGA supports the high pin count required for 24 analog inputs, 84 GPIO, and PMBus/serial interface pins in a compact 12x12 mm outline. Typical applications include FPGA/ASIC power-rail sequencing and supervision, ATCA/telecom board power management, server and storage-system boot sequencing, industrial multi-rail power distribution, and ACPI-compliant low-power state coordination. Use the UCD90320 Fusion Digital Power Designer GUI for offline configuration and the TI USB-to-GPIO adapter for in-system programming. When designing, always allocate sufficient bulk capacitance on monitored rails and verify ADC input dividers against the 6 V full-scale range.
UCD9090 - 10-Rail Power Sequencer & Monitor | Texas Instruments
The Texas Instruments UCD9090 is a 10-rail PMBus/I2C addressable power-supply sequencer and monitor. It integrates a 12-bit ADC for monitoring up to 10 power-supply voltage inputs, and 23 GPIO pins can be used for power-supply enables, power-on reset signals, external interrupts, cascading, or other system functions. Ten of these pins offer PWM functionality, enabling flexible control of power rails. The device is available in a 48-pin VQFN (7x7) package, suitable for compact board designs. A power-supply sequencer and monitor is a specialized power management IC that controls the order in which multiple voltage rails are turned on and off during system startup and shutdown. This is critical in complex electronic systems where certain rails must be established before others to prevent latch-up, excessive current draw, or damage to sensitive components. The UCD9090 sits within the power management IC hierarchy, specifically under the category of sequencers and monitors, which are essential for reliable multi-rail power delivery in servers, networking equipment, and industrial systems. Key features of the UCD9090 include its 10-channel sequencing capability, 12-bit ADC for accurate voltage monitoring, and PMBus/I2C interface for configuration and telemetry. The device supports ACPI (Advanced Configuration and Power Interface) for advanced power management in computing systems. Its GPIO pins provide versatile control options, including PWM outputs for margining or dynamic voltage scaling. The UCD9090 is designed for high-reliability applications, with a wide operating temperature range and robust fault handling. Technically, the UCD9090 uses a digital state machine to manage sequencing sequences, which can be programmed via PMBus commands. The integrated ADC samples each rail's voltage and compares it against programmable thresholds, triggering faults if voltages exceed or fall below limits. The device can also log fault events and report them to a host controller. This architecture enables precise, repeatable power sequencing and monitoring, reducing the need for external supervisory circuits. Typical applications include server and storage systems, networking equipment, telecommunications infrastructure, and industrial control systems. In these applications, the UCD9090 ensures that power rails are sequenced correctly, preventing system failures and improving reliability. Its PMBus interface allows for real-time monitoring and control, making it ideal for systems that require dynamic power management. When designing with the UCD9090, it is important to configure the sequencing parameters and fault thresholds via PMBus to match the specific power-up requirements of the system. Proper decoupling and layout are essential to ensure accurate ADC readings and stable operation. The device's flexibility in GPIO assignment should be leveraged to optimize board layout and minimize signal routing complexity.
UCD9090RGZ - 10-Rail Sequencer/Monitor, 48-VQFN | Texas Instruments
The Texas Instruments UCD9090RGZ is a 10-rail PMBus/I2C-addressable power-supply sequencer and monitor with ACPI support, housed in a 48-pin VQFN (RGZ) package (7x7 mm). It integrates a 12-bit ADC that samples up to 10 voltage rails and eight general-purpose digital inputs (GPIs), making it a system-health monitoring companion for multi-rail designs based on point-of-load converters. A power supply sequencer is a dedicated supervisory IC that turns rails on and off in a defined order, monitors their health after start-up, and reacts to faults. In the broader hierarchy it sits between the PMBus-controlled point-of-load (POL) converters it commands and the system-level power management firmware running on the host. Devices such as the UCD9090RGZ replace discrete supervisory chains with a single programmable, telemetry-rich block that designers can reconfigure over PMBus without a board spin. Key features include per-rail margining, programmable under-voltage and over-voltage thresholds, fault logging in non-volatile memory, watchdog timer, and pin-selected low-power states via up to three GPIs (eight ACPI-style states). The on-board 2.5 V, 0.5% internal reference gives repeatable ADC-based rail measurements, while the 12-bit ADC provides 0.1% typical resolution across the 0 V-2.5 V range. ACPI support lets the device implement S0/S1/S3/S4/S5-style low-power modes for energy-aware systems. Architecturally, the UCD9090RGZ pairs an internal ARM7-class controller with the sequencer/monitor state machine. The host configures rails via PMBus commands; the on-chip sequencer then drives external PGOOD/ENABLE/MARGIN pins and reads back rail voltages through the muxed ADC. The 48-VQFN (RGZ) package provides adequate thermal headroom for the 3.3 V supply operation. Typical applications include FPGA/processor power sequencing in telecom and networking line cards, ATCA/AMC/ATX power rails in servers, industrial PLCs with multiple voltage domains, and any system requiring ACPI-style sleep state coordination. The UCD90SEQ48EVM-560 evaluation module accelerates bring-up using the UCD9090RGZ on a 48-pin socketed board with USB-to-PC GUI. When designing with this part, place the device close to the regulators it sequences to minimize the loop on the EN/MARGIN/PGOOD traces, and follow TI's recommended BUF layout for the 0.1 uF/1 uF/10 uF decoupling. The fault log, programmable GPI de-bounce, and per-rail fault-response policy should be configured in the Fusion Digital Power Designer GUI before production. This page consolidates distributor pricing, drop-in alternatives, and design notes not bundled into the manufacturer datasheet, giving engineers a faster path from selection to bring-up.
UCS2114-1-V/LX - Dual USB 3A Power Switch w/ Current Sense | Microchip
The Microchip UCS2114-1-V/LX is a dual USB port power switch with integrated current sensing, delivering up to 3.0 A continuous (3.4 A maximum) per VBUS channel in a 20-pin VQFN (3x3 mm) package. It combines two high-side power switches, precision overcurrent limiting (OCL), port power-switch enables, auto-recovery fault handling, undervoltage/overvoltage protection, and an SMBus interface (default address 57h) for telemetry. The part is offered in tube packaging (denoted by the /LX suffix). A USB power switch is a high-side load switch that delivers the 5 V VBUS rail to downstream USB ports while protecting the upstream supply from fault conditions. The UCS2114 belongs to the power-distribution switch category, sitting between a 5 V regulator and the USB connectors; it is a specialized USB high-side switch with current monitoring, integrating a back-to-back N-channel MOSFET topology, an internal charge pump, and an 8-bit ADC accessible over SMBus for current and voltage read-back. Key features include 3.0 A continuous load current per channel, 3.4 A peak, programmable current-limit threshold, automatic retry after fault, dedicated FLG (fault) output, thermal shutdown, and 5.5 V absolute maximum input voltage. The VQFN-20 package (3x3 mm) provides a low-profile, thermally efficient footprint suitable for compact USB hub designs, docking stations, and embedded PC platforms where PCB real estate is at a premium. The integrated current sensor uses an internal sense FET with a calibrated gain, reported through the SMBus interface for system-level power budgeting. Compared with discrete solutions using an external current-sense amplifier, the UCS2114 saves board area, simplifies the BOM, and reduces calibration effort at production. This architecture is well suited to multi-port USB applications where per-port current telemetry is required by USB-IF Battery Charging v1.2 or proprietary charging protocols. Typical applications include USB 3.0/3.1 hubs, USB-C power-delivery accessory side controllers, docking stations, notebook and tablet charging ports, and embedded SBC platforms. The 3.4 A peak capability supports USB Battery Charging v1.2 CDP/DCP modes and standard downstream ports needing 5 V @ 2.4 A to 3.0 A. Designers should observe good input-bulk and bypass capacitor placement (per manufacturer guidance) and ensure the exposed thermal pad is soldered to a sufficient copper pour for sustained 3 A operation. Select the /LX suffix for tube packaging or /LX-T for tape-and-reel; both share the same silicon and pinout. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
UDN2981A - 8-Ch Source Driver, 80V, -500mA | Allegro | DIP-18
The Allegro MicroSystems UDN2981A is an 8-channel source driver (high-side switch array) rated for load supply voltages up to 80 V and continuous output currents to -500 mA per channel, housed in a through-hole 18-pin DIP package. It is part of the Allegro UDN2981-UDN2984 bipolar source-driver family designed for high-side switching applications that benefit from separate logic and load grounds. What is a source driver? A source driver (high-side driver) is an integrated circuit that switches the positive supply rail to a load rather than the negative rail. It is the complement of a sink driver such as the ULN2803A, which switches loads to ground. Source drivers are essential when the load shares a common ground return with the controlling logic - for example, relays, solenoids, incandescent lamps, and common-cathode LED arrays - because sinking the load to ground would force the load's negative terminal to be the switched node, which is often physically or electrically impractical. Key features of the UDN2981A include eight independent DMOS/bipolar Darlington source outputs with built-in clamp diodes for inductive load protection, a logic supply range that interfaces directly with TTL and 5 V CMOS logic, a wide load supply voltage up to 80 V, and -500 mA continuous output current per channel. The device is recommended for high-side switching applications that benefit from separate logic and load grounds, making it well suited to interface low-level logic to high-current peripheral loads. Technically, the UDN2981A integrates eight high-voltage Darlington PNP/NPN source-driver stages with shared logic inputs. Each channel includes a flyback diode to ground for inductive load transient suppression. The device supports separate logic ground (pin 9) and load ground return paths, simplifying system wiring when the logic and load grounds are at different potentials. Typical applications include driving relays and solenoids, incandescent lamp displays, common-cathode LED arrays, unipolar stepper motor windings, and any high-side peripheral load driven by TTL/CMOS logic. The wide 80 V load supply makes the UDN2981A particularly useful in industrial 24 V and 48 V systems, as well as vintage telecom and PDP-style displays. When designing with the UDN2981A, place a 0.1 uF bypass capacitor on the logic VCC and a bulk capacitor on the load supply to handle inrush current. Ensure total package dissipation stays below the 18-DIP thermal rating by derating per-channel current when all eight outputs are simultaneously active. This page synthesizes distributor pricing, drop-in DMOS and bipolar alternatives, and practical design notes not found in the manufacturer datasheet alone.