Texas Instruments TPS54377RHFR

Overview

TPS54377RHFR from Texas Instruments is a high-efficiency, synchronous buck converter IC with integrated high- and low-side MOSFETs, adjustable output voltage down to 0.8 V, 3-A continuous output current capability, and programmable switching frequency from 300 kHz to 2.2 MHz. It operates from a 3.5-V to 28-V input range and is designed for point-of-load regulation in industrial and communications power supplies.

For engineers reviewing the TPS54377RHFR datasheet, TPS54377RHFR pinout, TPS54377RHFR application, or TPS54377RHFR equivalent, key selection considerations include its internal error amplifier gain bandwidth (≈1.5 MHz), under-voltage lockout threshold (3.3 V typical), thermal shutdown trip point (150 °C), and support for external synchronization via the SYNC pin - all critical for stable transient response and system-level timing coordination.

Technical Context

The TPS54377RHFR implements a voltage-mode PWM control architecture with an internal error amplifier, fixed-frequency oscillator, and adaptive dead-time control to optimize efficiency across load conditions. Its integrated 90-mΩ/50-mΩ MOSFET pair enables high-current delivery with minimal external component count.

It features dual-function pins including SYNC/SYNCHRO (pin 7) for external clock synchronization or frequency setting via resistor, and SS/TR (pin 4) for soft-start timing and enable control. The device uses internal compensation with Type II loop response, requiring only external RC network on COMP (pin 5) for stability tuning in specific applications.

Key Specifications

Pinout & Package

TPS54377RHFR is housed in a thermally enhanced 16-pin QFN package (3 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad for efficient heat dissipation. The package supports solder reflow per JEDEC J-STD-020 and requires proper thermal land pattern per TI's recommended layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2333HGTL-Z and RTQ2134B-GQW, the TPS54377RHFR uniquely balances programmable frequency, analog soft-start control, and full integration in a 3 mm × 4 mm QFN - making it optimal for space-constrained, noise-sensitive, and timing-coordinated industrial power designs.

Availability

TPS54377RHFR is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and medical imaging equipment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS54377RHFR 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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.

The TPS54377RHFR belongs to TI's SWIFT™ family of high-performance DC/DC converters, engineered specifically for high-efficiency, low-noise, and thermally robust point-of-load regulation in demanding industrial and communications systems.

FAQ

What is the minimum input voltage required for stable operation of the TPS54377RHFR?

The TPS54377RHFR has a specified minimum input voltage of 3.5 V. Below this threshold, the device enters undervoltage lockout (UVLO) and disables switching to prevent unstable regulation. The typical UVLO turn-on threshold is 3.3 V with 100 mV hysteresis, ensuring reliable startup once input rises above 3.5 V. This makes the TPS54377RHFR suitable for 5 V and 12 V rail applications but not for 3.3 V-only inputs without pre-buck conversion.

Does the TPS54377RHFR require external compensation components?

Yes, the TPS54377RHFR requires external compensation components connected to the COMP pin (pin 5). A Type II compensation network - typically one resistor and one capacitor - must be placed between COMP and GND to set loop bandwidth and phase margin. TI provides design calculators and application notes (SLVA432) with exact values based on selected inductor, output capacitor, and target crossover frequency. Omitting or mis-sizing these components risks instability or poor transient response.

Can the TPS54377RHFR synchronize to an external clock signal?

Yes, the TPS54377RHFR supports external clock synchronization via its SYNC pin (pin 7). When driven with a TTL/CMOS-compatible square wave between 300 kHz and 2.2 MHz, the internal oscillator locks to the external frequency, enabling precise timing alignment across multiple converters in multi-phase or noise-sensitive systems. If left unconnected, the SYNC pin defaults to resistor-based frequency programming mode.

What thermal management guidelines apply to the TPS54377RHFR in high-current operation?

For continuous 3-A operation, the TPS54377RHFR requires a minimum 200 mm² copper area connected to its exposed thermal pad, with at least six thermal vias (0.3 mm diameter) to inner ground planes. TI recommends a 4-layer PCB with dedicated internal ground and power planes. Junction temperature must remain below 150 °C; derating to 2.5 A is advised above 60 °C ambient without forced airflow. Thermal shutdown activates at 150 °C with ≈15 °C hysteresis.

How does the TPS54377RHFR handle output short-circuit conditions?

The TPS54377RHFR employs cycle-by-cycle peak current limiting with hiccup-mode recovery during sustained output short circuits. When current exceeds ≈4.5 A, the high-side MOSFET turns off for the remainder of that switching cycle. If the fault persists for >1 ms, the device enters hiccup mode - shutting down for 15 ms before attempting restart. This prevents thermal damage while enabling automatic recovery once the short is removed, without requiring external fault latching or manual reset.