Texas Instruments UCC24610DRBR

Overview

UCC24610DRBR from Texas Instruments is a secondary-side synchronous rectifier controller optimized for 5-V output flyback and LLC-resonant power supplies, featuring V_DS-sensing, programmable minimum on/off-time (t_ON = 0.17–3.8 µs, t_OFF = 0.48–9.86 µs), 1.6-Ω pulldown / 2.0-Ω pullup gate drive, and 20-ns typical turnoff propagation delay. It enables high-efficiency low-voltage rectification in AC-to-DC adapters and bias supplies.

For engineers reviewing the UCC24610DRBR datasheet, UCC24610DRBR pinout, UCC24610DRBR application, or UCC24610DRBR equivalent, key selection criteria include its drain-sense architecture, light-load auto-sleep mode, SYNC input for CCM operation, UVLO thresholds (V_CC(ON) = 4.40 V, V_CC(OFF) = 4.20 V), and compatibility with logic-level N-channel MOSFETs in 3.0 mm × 3.0 mm SON packaging.

Technical Context

The UCC24610DRBR implements a voltage-mode, V_DS-sensing control loop that triggers GATE high when (V_D – V_S) falls below –150 mV and turns GATE low when (V_D – V_S) rises above –5 mV - enabling near-ideal diode emulation. Its dual-programmable timing (TON via external resistor to GND, TOFF via EN/TOFF pin voltage) suppresses false triggering from resonant ringing in DCM and CCM topologies.

It integrates UVLO (4.40 V turn-on, 4.20 V turn-off), micro-power sleep current (200 µA), automatic light-load mode entry/exit, and asynchronous SYNC-driven forced turnoff. The internal two-level EN/TOFF current source (–20.0 µA start, –10.0 µA run) allows robust enable threshold setting and precise off-time programming without external voltage sources.

Key Specifications

Pinout & Package

The UCC24610DRBR is housed in an 8-pin SON package (3.0 mm × 3.0 mm) with exposed thermal pad, optimized for compact, thermally efficient PCB layouts in space-constrained adapters and bias supplies.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous rectifier controller applications.

Compared with UCC24610DRBR, UCC24612DRBR adds integrated biasing flexibility at minor size cost, while MP6908GJ-Z trades programmability for lower unit price - making UCC24610DRBR the optimal balance of precision, efficiency, and design adaptability for 5-V flyback/LLC systems.

Availability

UCC24610DRBR is available at Aetrix Electronics and suitable for AC-to-DC adapters, 5-V bias supplies, and flyback/LLC converters requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for UCC24610DRBR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in power conversion ICs.

The UCC24610DRBR belongs to TI's GREEN Rectifier™ synchronous rectifier controller family, designed specifically to replace Schottky diodes in low-voltage secondary-side power stages - maximizing efficiency and minimizing thermal stress in compact, high-density power supplies.

FAQ

What is the recommended V_CC bypass capacitor for UCC24610DRBR?

A 0.1-µF or larger ceramic capacitor must be placed between V_CC and GND using short PCB traces. This stabilizes the internal bias rail, suppresses high-frequency noise from gate switching, and ensures reliable UVLO operation and gate driver performance across temperature and load. The UCC24610DRBR datasheet specifies this value as mandatory for all operating conditions.

How does UCC24610DRBR enter and exit light-load mode?

The UCC24610DRBR enters light-load mode when the measured V_D–V_S crossing occurs before the programmed t_ON timer expires - indicating insufficient conduction time. It exits automatically on the next cycle when V_D–V_S remains below –5 mV past t_ON expiration. This behavior is intrinsic to the UCC24610DRBR's analog timing architecture and requires no external configuration.

Can UCC24610DRBR drive high-side N-channel MOSFETs?

No - the UCC24610DRBR is designed exclusively for low-side (source-referenced) N-channel MOSFETs in secondary-side synchronous rectification. Its V_S pin serves as the reference for V_DS sensing and gate drive return; it lacks high-side floating supply or level-shifting circuitry required for high-side configurations. Using it with high-side FETs will result in improper sensing and drive failure.

What is the purpose of the exposed thermal pad on the UCC24610DRBR SON package?

The exposed thermal pad on the UCC24610DRBR enhances thermal dissipation by lowering R_θJA to 48.3 °C/W - critical for maintaining junction temperature below 125°C in high-frequency, high-current rectifier applications. It must be soldered to a PCB copper pour connected to GND; leaving it unconnected degrades thermal performance and risks reliability issues under sustained load.

Does UCC24610DRBR require an external resistor on the SYNC pin?

No - the UCC24610DRBR includes an internal 2.0-kΩ pullup resistor from SYNC to V_CC, so no external pullup is needed. However, a series current-limiting resistor may be required when coupling SYNC to high-slew-rate primary-side signals via isolation capacitors, to ensure input current stays within ±100 mA absolute maximum rating per the UCC24610DRBR datasheet.