Texas Instruments UC3714DP

Overview

UC3714DP from Texas Instruments is a high-speed dual-output synchronous rectifier driver IC designed for complementary switch control in zero-voltage switching (ZVS) topologies. It delivers 1.0A source / 2A sink on the PWR output and 0.5A source / 1A sink on the AUX output, with independently programmable 50–500ns delays between outputs, and supports up to 1MHz switching frequency in DC-DC converters and forward/active-clamp flyback power supplies.

For engineers reviewing the UC3714DP datasheet, UC3714DP pinout, UC3714DP application, or UC3714DP equivalent, key selection considerations include its SOIC-16 package, TTL-compatible input, ENBL sleep mode (220µA), true zero-voltage sensing capability on T1/T2 pins, and distinct delay configuration logic for soft-switching timing control.

Technical Context

The UC3714DP implements two independent timing channels (T1 and T2) that control dead-time between AUX and PWR outputs via external resistors, enabling precise ZVS transition tuning. Each channel features internal 3V reference and ±2mA current limiting, allowing either delay programming or zero-voltage sensing by pulling T1/T2 below 2.5V.

Its logic architecture supports both UC1714-style (AUX inverted) and UC1715-style (true complementary) operation modes depending on external configuration; the DP package provides full pin access for both modes, unlike 8-pin variants. Propagation delays are tightly controlled at 35–100ns (PWR) and 35–80ns (AUX), with rise/fall times under 60ns into specified loads.

Key Specifications

Pinout & Package

UC3714DP is housed in a 16-pin SOIC (D) package with 1.27mm pitch, JEDEC MS-012AC compliant, moisture sensitivity level 2-260°C, RoHS-compliant green finish (Pb-free, no Sb/Br).

Key Features

Applications

Equivalent & Alternatives

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

Compared with UC3715DP, UC3714DP provides inverted AUX output ideal for p-channel auxiliary switches, while UCC27201D offers higher drive strength but lacks built-in delay/ZVS features-making UC3714DP optimal for compact, self-timed ZVS designs where board space and component count are constrained.

Availability

UC3714DP is available at Aetrix Electronics and suitable for forward converters, active-clamp flyback supplies, synchronous buck regulators, and isolated DC-DC modules requiring stable component supply and long-term design continuity.

Supply support for UC3714DP 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions across industrial, automotive, and communications markets.

The UC37xx family was developed specifically for high-frequency soft-switching power conversion, targeting ZVS-enabled topologies where precise, independent dead-time control between complementary switches is essential for efficiency and reliability.

FAQ

What is the maximum operating frequency supported by the UC3714DP?

The UC3714DP supports switching frequencies up to 1MHz, as confirmed in the Features section and Electrical Characteristics table. This capability is enabled by its sub-100ns propagation delays and fast rise/fall times (<60ns), making it suitable for high-density power supplies where switching loss reduction and magnetics size optimization are critical design goals. The UC3714DP maintains timing accuracy across its full 0°C to +70°C operating range.

Does the UC3714DP support zero-voltage switching (ZVS) without external components?

Yes, the UC3714DP supports true zero-voltage switching through its T1 and T2 pins, which feature internal voltage comparators referenced to ~3V. When either timer pin is pulled below ~2.5V, the corresponding output activates immediately-enabling direct detection of zero voltage across a resonant switch without external comparators or logic. This function is documented in the PIN DESCRIPTIONS and Typical Applications sections of SLUS170A.

How does the UC3714DP differ from the UC3715DP in terms of output polarity?

The UC3714DP configures its AUX output as inverted relative to INPUT, enabling direct drive of p-channel MOSFETs, whereas the UC3715DP provides true complementary outputs (both non-inverted) for dual n-channel configurations. This functional distinction is explicitly stated in the DESCRIPTION section and block diagram notes of SLUS170A, and both parts share identical timing, drive strength, and package specifications.

What is the purpose of the ENBL pin on the UC3714DP, and what happens during sleep mode?

The ENBL pin on the UC3714DP activates a 220µA sleep mode when held at ≤0.8V, reducing ICC to microamp levels while forcing the PWR output active-low and placing AUX in high-impedance state. This behavior is verified in the ABSOLUTE MAXIMUM RATINGS and ELECTRICAL CHARACTERISTICS tables, and enables low-power standby operation in battery-backed or energy-sensitive systems without external gate discharge paths.

Can the UC3714DP drive both high-side and low-side n-channel MOSFETs simultaneously?

No-the UC3714DP's inverted AUX output is optimized for p-channel auxiliary switches; driving two n-channel FETs requires matched edge timing not provided by its signal polarity. For dual n-channel configurations, TI specifies the UC3715DP as the correct variant. This distinction is clearly defined in the DESCRIPTION and PIN DESCRIPTIONS sections of SLUS170A, and misapplication risks shoot-through or failed ZVS transitions.