Texas Instruments UCC27527DSDT

Overview

UCC27527DSDT from Texas Instruments is a dual-channel, low-side MOSFET/IGBT gate driver IC with independent inverting and non-inverting inputs per channel, 5-A peak source/sink drive current, 17-ns typical propagation delay, and 1-ns typical inter-channel delay matching - deployed in synchronous rectifier circuits and GaN-based DC-DC converters.

For engineers reviewing the UCC27527DSDT datasheet, UCC27527DSDT pinout, UCC27527DSDT application, or UCC27527DSDT equivalent, key selection criteria include CMOS-input threshold logic (VIN_H = 55% VDD), –5-V input negative voltage tolerance, UVLO-enabled glitch-free power-up behavior, and WSON-8 package thermal performance (RθJA = 46.1°C/W).

Technical Context

The UCC27527DSDT implements dual independent gate drivers with configurable input polarity: each channel accepts either IN+ (non-inverting) or IN– (inverting) control, with unused inputs internally biased via pull-up/pull-down resistors to ensure safe low-output state during floating conditions. Its CMOS-input thresholds scale with VDD (VIN_H = 55% VDD, VIN_L = 38% VDD), delivering wide hysteresis (17% VDD) for noise immunity in high-dV/dt environments.

Internally, the device features rail-to-rail output stages with matched 2.5–7.5 Ω pull-up (ROH) and 0.15–1 Ω pull-down (ROL) resistances, enabling fast 7-ns rise and 6-ns fall times into 1.8-nF loads at 10-V VDD. UVLO circuitry holds outputs low until VDD exceeds 4.20 V (typ), with 350-mV hysteresis to prevent chatter during supply droop.

Key Specifications

Pinout & Package

UCC27527DSDT is housed in an 8-pin WSON package (3.0 mm × 3.0 mm, 0.65-mm pitch) with exposed thermal pad. Pin 1 is marked by a dot; top-side silkscreen identifies pin 1 orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-side gate driver applications.

Compared with UCC27528DSDT, UCC27527DSDT offers per-channel polarity flexibility but lacks dedicated enable pins; versus LM5113SDX, it provides tighter delay matching and integrated UVLO hysteresis critical for multi-phase power stages.

Availability

UCC27527DSDT is available at Aetrix Electronics and suitable for motor control systems, solar microinverters, server VRMs, and industrial UPS systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for UCC27527DSDT 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, designing analog and embedded processing chips for industrial, automotive, and communications markets.

The UCC27527DSDT belongs to TI's UCC2752x family of high-speed low-side gate drivers, engineered specifically for high-frequency, high-efficiency power conversion using Si, SiC, and GaN power devices.

FAQ

What is the maximum allowable negative voltage on the UCC27527DSDT input pins?

The UCC27527DSDT input pins (INA+, INA−, INB+, INB−) tolerate –5 V continuously, as specified in the Absolute Maximum Ratings table. This rating applies regardless of VDD voltage and enables direct interfacing with noisy gate-drive feedback signals without external clamping diodes. The –5-V capability is verified per JEDEC JESD78 latch-up testing and is not dependent on VDD bias.

Does UCC27527DSDT support inverting and non-inverting operation on the same channel simultaneously?

No. Each channel of the UCC27527DSDT operates in either inverting or non-inverting mode, selected by which input (IN+ or IN−) is actively driven. For Channel A, driving INA+ high while holding INA− low yields non-inverting behavior; driving INA− high while holding INA+ low yields inverting behavior. Both inputs must not be driven simultaneously, as this creates undefined output states per the functional description in Section 5 of the datasheet.

What is the purpose of the internal pull-up and pull-down resistors on UCC27527DSDT input pins?

The internal pull-up and pull-down resistors on UCC27527DSDT input pins ensure that OUTA and OUTB remain in a known low state when any input pin floats - a safety requirement for IEC 62368-1 abnormal condition testing. These resistors eliminate the need for external biasing components in fail-safe designs and guarantee glitch-free startup even if controller firmware fails to initialize GPIOs before power-up.

How does the CMOS input threshold logic of UCC27527DSDT improve noise immunity compared to TTL-compatible drivers?

The UCC27527DSDT uses VDD-referenced CMOS thresholds (VIN_H = 55% VDD, VIN_L = 38% VDD) with 17% VDD hysteresis, yielding larger noise margins than fixed-threshold TTL logic. At VDD = 12 V, this provides ±2.04 V noise margin versus ±0.8 V for standard TTL, making the UCC27527DSDT robust against coupled switching noise in high-power converters without requiring Schmitt-trigger buffers.

Can UCC27527DSDT drive GaN FETs effectively at 1-MHz switching frequency?

Yes. The UCC27527DSDT delivers 7-ns rise and 6-ns fall times into 1.8-nF loads at 10-V VDD, and its 5-A peak current supports rapid charging of typical 0.5–1.2-nF GaN gate capacitances. Combined with 1-ns inter-channel delay matching and UVLO hold-low behavior, the UCC27527DSDT enables reliable ZVS operation in 1-MHz GaN-based LLC resonant converters as validated in TI's TIDU857 reference design.