Texas Instruments UCC27523DSDT

Overview

UCC27523DSDT from Texas Instruments is a dual-channel, low-side gate driver IC designed for high-frequency switching power stages. It delivers 5A peak source/sink current per channel, features 13ns typical propagation delay and 1ns typical inter-channel delay matching, and operates from 4.5V to 18V supply - enabling robust drive of Si MOSFETs and GaN power devices in synchronous rectifier and DC-DC converter topologies.

For engineers reviewing the UCC27523DSDT datasheet, UCC27523DSDT pinout, UCC27523DSDT application, or UCC27523DSDT equivalent, key selection criteria include independent enable control per channel, TTL/CMOS-compatible logic thresholds independent of VDD, rail-to-rail output swing, UVLO-protected glitch-free startup, and WSON-8 thermal performance with exposed pad.

Technical Context

The UCC27523DSDT implements two independent inverting-input gate drivers with dedicated ENA/ENB pins. Its input stage uses fixed-threshold TTL/CMOS logic (1.2V low / 2.1V high) with 0.9V hysteresis, decoupled from VDD voltage level - allowing direct interfacing with 3.3V or 5V controllers even when VDD = 12V or 15V. Internal pullup resistors on INA/INB ensure outputs remain LOW during floating inputs.

Propagation delay matching (1ns typ) and fast edge rates (7ns rise / 6ns fall at 1.8nF) support precise timing-critical applications like synchronous rectification. UVLO circuitry holds both outputs LOW until VDD exceeds 4.2V (with 0.3V hysteresis), preventing spurious switching during power-up/down sequences.

Key Specifications

Pinout & Package

UCC27523DSDT is housed in an 8-pin WSON package (3mm × 3mm) with exposed thermal pad (DSD suffix). The package provides low R_θJA = 46.7°C/W and R_θJC(bot) = 9.5°C/W, enabling high-power-density PCB layouts with minimal heatsinking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCC27524DSDT and UCC27525DSDT, the UCC27523DSDT uniquely provides dual inverting inputs plus independent enable pins - making it optimal for synchronous rectifier control and fault-isolated multi-phase designs where consistent logic polarity and granular channel control are mandatory.

Availability

UCC27523DSDT is available at Aetrix Electronics and suitable for switched-mode power supplies, DC-DC converters, and motor control systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial and automotive-grade production.

Supply support for UCC27523DSDT 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 specializing in analog, embedded processing, and power management technologies, with leadership in high-reliability industrial and automotive solutions.

The UCC2752x family was engineered specifically for high-efficiency, high-frequency power conversion - targeting GaN/SiC gate drive, synchronous rectification, and compact SMPS where timing precision, thermal resilience, and logic flexibility are critical.

FAQ

What is the logic configuration of the UCC27523DSDT?

The UCC27523DSDT features dual inverting inputs: INA controls OUTA and INB controls OUTB, both with active-low logic behavior. When INA is HIGH, OUTA is LOW; when INA is LOW, OUTA is HIGH. This configuration is explicitly defined in the device's pin-function table and functional block diagram, and distinguishes it from UCC27524DSDT (dual non-inverting) and UCC27525DSDT (mixed logic).

Does the UCC27523DSDT support parallel operation of its two channels?

Yes, the UCC27523DSDT supports parallel operation: OUTA and OUTB can be connected together to deliver up to 10A peak drive current to a single power switch. Its 1ns typical inter-channel delay matching and matched output impedance minimize current imbalance and dynamic stress - a capability confirmed in the device description and Figure 7-1 block diagram.

What is the purpose of the ENA and ENB pins on the UCC27523DSDT?

The ENA and ENB pins provide independent active-high enable control for each output channel. When pulled LOW (<1.15V), they force the respective output LOW regardless of input state; when HIGH or floating, they allow normal inverting operation. This enables per-channel soft-start, fault shutdown, or phase sequencing - a feature documented in Table 5-1 and Section 7.3.3 of the datasheet.

How does the UCC27523DSDT behave during power-up?

During power-up, the UCC27523DSDT holds both OUTA and OUTB LOW until VDD rises above the UVLO threshold (~4.2V), then begins responding to INA/INB signals. This behavior is enforced by internal UVLO circuitry and ensures glitch-free startup - explicitly stated in the Features list ("Outputs held low during VDD-UVLO") and Section 7.3.1.

Is the UCC27523DSDT compatible with 3.3V microcontroller logic levels?

Yes, the UCC27523DSDT accepts 3.3V logic inputs reliably: its input thresholds (V_{IN_H} = 2.1V typ, V_{IN_L} = 1.2V typ) are fixed and independent of VDD, and its 0.9V hysteresis provides noise margin. This compatibility is confirmed in the Features list ("TTL and CMOS compatible logic threshold independent of supply voltage") and Section 7.3.3.