Texas Instruments UCC24612-1DBVR

Overview

UCC24612-1DBVR from Texas Instruments is a high-frequency synchronous rectifier controller for N-channel MOSFETs in flyback, LLC, and active clamp topologies. It features 1 MHz max switching frequency, 80 ns typical turn-on propagation delay, 4-A sink / 1-A source gate driver, 9.5-V gate drive clamp, and adaptive minimum off-time for noise immunity - enabling high-efficiency AC/DC adapters and USB PD power supplies.

For engineers reviewing the UCC24612-1DBVR datasheet, UCC24612-1DBVR pinout, UCC24612-1DBVR application, or UCC24612-1DBVR equivalent, key selection factors include V_DS-sensing threshold accuracy (–240 mV typ. turn-on), proportional gate drive activation at –50 mV, thermal shutdown at 165°C, SOT23-5 package constraints, and variant-specific minimum on-time (375 ns).

Technical Context

The UCC24612-1DBVR implements drain-to-source voltage sensing with dual thresholds: V_THVGON = –240 mV (typ.) for turn-on and V_THVGOFF = –9 mV (typ.) for turn-off. Its proportional gate drive reduces VG from 9.5 V to ~5 V when V_DS ≥ –50 mV, minimizing turn-off delay in CCM operation.

It integrates a 9.5-V linear regulator (REG pin) powered from VDD (4–28 V), supports both high-side and low-side SR configurations, and includes cycle-limit pre-turn-off logic plus adaptive blanking to suppress parasitic ringing - critical for GaN-primary active clamp flyback designs operating up to 1 MHz.

Key Specifications

Pinout & Package

SOT23-5 package (3.00 mm × 3.00 mm), surface-mount, thermally enhanced for high-current SR gate drive applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC24612-2DBVR and MP6908GJ-Z, the UCC24612-1DBVR delivers superior noise immunity in GaN-primary designs, faster transient response in CCM, and lower system-level losses via its 80 ns propagation delay and dynamic gate voltage control - making it optimal for high-density USB PD and telecom applications.

Availability

UCC24612-1DBVR is available at Aetrix Electronics and suitable for USB Type-C power delivery adapters, server auxiliary power supplies, and telecom DC/DC bricks requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for UCC24612-1DBVR 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 delivering analog, embedded processing, and power management solutions with emphasis on energy efficiency and system integration.

The UCC24612 family was designed specifically for high-frequency synchronous rectification in AC/DC power supplies targeting DoE Level VI and CoC Tier 2 efficiency compliance across flyback, LLC, and active clamp topologies.

FAQ

What is the maximum V_DS sensing voltage supported by the UCC24612-1DBVR?

The UCC24612-1DBVR supports MOSFET drain-to-source voltage sensing up to 230 V, verified per absolute maximum ratings in the official datasheet. This allows direct use in 24-V output systems and high-voltage auxiliary rails without external level-shifting circuitry. The VD pin withstands –1.0 V to +230 V, ensuring robust operation during transient overvoltage events common in flyback reset cycles.

How does the UCC24612-1DBVR achieve 1 MHz operation despite SOT23-5 packaging?

The UCC24612-1DBVR achieves 1 MHz operation through ultra-fast internal comparators (80 ns turn-on delay), optimized gate driver impedance (0.45 Ω sink resistance), and adaptive minimum off-time that rejects parasitic ringing without compromising switching speed. Its SOT23-5 package uses short internal bond wires and low-inductance die attach to maintain signal integrity at high frequencies, validated in TI's reference designs for GaN-based 1-MHz active clamp flyback.

Can the UCC24612-1DBVR be used in high-side synchronous rectification configurations?

Yes, the UCC24612-1DBVR supports high-side SR configuration using an external R-C-D bias network connected to the VD pin, as documented in Section 7.3.1 of the SLUSCM5A datasheet. This method leverages the device's wide VDD range (4–28 V) and internal 9.5-V REG regulator to maintain stable gate drive even when referenced to the high-side MOSFET drain - confirmed in TI's TIDA-01622 reference design.

What is the purpose of the proportional gate drive feature in the UCC24612-1DBVR?

The proportional gate drive in the UCC24612-1DBVR reduces the VG output voltage from 9.5 V to ~5 V when V_DS reaches –50 mV, accelerating turn-off in continuous conduction mode. This cuts gate discharge time by >60%, eliminating reverse current and body diode conduction loss. It is especially critical in telecom DC/DC bricks where deep CCM operation demands precise zero-current switching - a function not present in non-proportional alternatives like MP6908GJ-Z.

Does the UCC24612-1DBVR include thermal protection?

Yes, the UCC24612-1DBVR includes integrated thermal shutdown at 165°C (typ.) with 15°C hysteresis, as specified in Section 6.6 of the SLUSCM5A datasheet. When junction temperature exceeds this threshold, the device disables VG output and enters thermal shutdown until temperature falls below 150°C. This protects both the controller and the driven MOSFET during sustained overload or inadequate heatsinking in enclosed adapter designs.