Texas Instruments TPS54350PWPG4

Overview

TPS54350PWPG4 from Texas Instruments is a synchronous buck PWM converter with integrated 100 mΩ high-side MOSFET and external low-side gate driver (LSG), supporting adjustable output down to 0.891 V at ±1% reference accuracy, 250–700 kHz programmable switching frequency, and 180° out-of-phase synchronization for multi-rail systems in point-of-load regulation.

For engineers reviewing the TPS54350PWPG4 datasheet, TPS54350PWPG4 pinout, TPS54350PWPG4 application, or TPS54350PWPG4 equivalent, key selection considerations include its 3-A continuous output capability, thermal shutdown at 165°C, internal slow-start timing (2.3–4.6 ms), UVLO adjustability via external resistor divider, and compatibility with both Schottky diode and synchronous MOSFET configurations.

Technical Context

The TPS54350PWPG4 implements feed-forward modulator control with constant 8 V/V gain across 250–700 kHz, adaptive dead-time logic preventing shoot-through between high- and low-side switches, and a true voltage error amplifier with 60–80 dB open-loop gain and 1.0–2.8 MHz unity-gain bandwidth. Its PWM comparator uses valley-current sensing and supports hiccup-mode overcurrent protection with 4.5 ms recovery time at 500 kHz.

It features bidirectional SYNC functionality-output mode when RT is grounded/floating (250/500 kHz fixed), input mode when RT is resistor-set (250–700 kHz)-enabling precise 180° phase alignment between multiple converters. The internal VBIAS regulator delivers 7.5–8.0 V at up to 1 mA, powering analog circuitry and LSG driver while requiring a mandatory 1.0 µF ceramic bypass capacitor.

Key Specifications

Pinout & Package

TPS54350PWPG4 is housed in a thermally enhanced 16-pin HTSSOP (PWP) PowerPAD™ package with exposed thermal pad soldered to PCB ground plane for optimal junction-to-ambient thermal resistance (42.1°C/W with proper layout).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54350PWPG4, TPS54340DDAR lacks LSG driver and high-side integration-reducing component count but limiting peak efficiency at 3 A-while LM5116MHX/NOPB offers broader input range and full external control at the cost of added BOM complexity and layout sensitivity.

Availability

TPS54350PWPG4 is available at Aetrix Electronics and suitable for industrial point-of-load regulation, FPGA core voltage supply, computer peripheral power, LCD monitor backlight driver, and embedded system power management requiring stable component supply across extended temperature ranges.

Supply support for TPS54350PWPG4 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 ICs, with decades of expertise in high-efficiency DC/DC conversion and automotive-grade reliability.

The TPS54350PWPG4 belongs to TI's SWIFT™ family of integrated power solutions, designed specifically for high-performance, space-constrained point-of-load applications in computing, industrial automation, and consumer electronics.

FAQ

What is the maximum continuous output current supported by the TPS54350PWPG4?

The TPS54350PWPG4 supports 3 A continuous output current with its integrated 100 mΩ high-side MOSFET and thermal design optimized for the 16-pin HTSSOP PowerPAD package. Peak current capability reaches 4.5 A before current-limit activation, but sustained operation above 3 A requires careful thermal management and PCB copper area optimization per TI's SLMA002 guidelines.

How does the TPS54350PWPG4 achieve 180° out-of-phase synchronization between multiple units?

The TPS54350PWPG4 achieves 180° out-of-phase synchronization via its bidirectional SYNC pin: when one device operates in SYNC output mode (RT grounded or floating), its falling-edge SYNC signal aligns 180° out-of-phase with the rising edge of its PH pin; a second TPS54350PWPG4 configured with RT resistor-set then uses that signal as SYNC input, locking its switching edge to the inverse phase-reducing total input ripple current by √2.

Can the TPS54350PWPG4 operate with only an external Schottky diode instead of a low-side MOSFET?

Yes, the TPS54350PWPG4 can operate with only an external Schottky diode connected from PH to ground. In this configuration, the internal pulldown MOSFET handles light-load conduction, maintaining continuous conduction mode down to ~0.3 A. However, full synchronous operation using the LSG pin to drive an external N-channel MOSFET improves efficiency by 3–5% at medium-to-heavy loads.

What is the purpose of the UVLO pin on the TPS54350PWPG4, and how is it configured?

The UVLO pin on the TPS54350PWPG4 allows customization of the input voltage startup threshold beyond the default 4.49 V. By connecting an external resistor divider from VIN to ground-with the junction tied to UVLO-the designer sets precise start/stop voltages (e.g., 7.8 V start). TI recommends a 1-kΩ low-side resistor for accuracy, and direct connection of UVLO to VIN is prohibited to avoid damage.

Does the TPS54350PWPG4 require external compensation components, and where are they connected?

Yes, the TPS54350PWPG4 requires external frequency compensation components connected between the COMP and VSENSE pins. A standard Type II network-typically a series RC from COMP to VSENSE plus a capacitor from VSENSE to AGND-is used to stabilize the voltage loop. Component values depend on output capacitance, ESR, and desired phase margin; TI's SWIFT Designer software automates selection based on user-defined performance targets.