Texas Instruments TPS56837HRPAR

Overview

TPS56837HRPAR from Texas Instruments is an 8A synchronous buck converter supporting USB Power Delivery (USB PD) with 4.5V–28V input, 4V–22V output, fixed 500kHz switching frequency, D-CAP3™ control mode, and integrated 20.4mΩ/9.5mΩ MOSFETs - deployed in industrial PCs, monitors, and USB PD power supplies.

For engineers reviewing the TPS56837HRPAR datasheet, TPS56837HRPAR pinout, TPS56837HRPAR application, or TPS56837HRPAR equivalent, key selection considerations include output discharge capability, three-mode current limit configuration via MODE pin, Eco-mode light-load efficiency, non-latched thermal/overvoltage/undervoltage protection, and HotRod™ QFN package thermal performance.

Technical Context

The TPS56837HRPAR implements D-CAP3™ adaptive on-time control with internal ripple injection, enabling stable regulation with ultra-low-ESR MLCC output capacitors and eliminating external compensation. It transitions seamlessly between CCM and DCM modes using Eco-mode logic to maintain high efficiency across load range.

It features cycle-by-cycle valley current limiting on the low-side MOSFET (with three selectable thresholds: 7.2A/9.6A/12A) and peak current limiting on the high-side MOSFET (15A typ), plus non-latched protections including UVLO (4.2V rise/3.65V fall), OVP (125% VOUT), UVP (65% VOUT), and thermal shutdown (165°C with 30°C hysteresis).

Key Specifications

Pinout & Package

TPS56837HRPAR uses a 10-pin 3.0mm × 3.0mm HotRod™ QFN (RPA package) with exposed thermal pad for enhanced power dissipation. Pin 1 is EN; pins 8–10 are VIN (power input); pin 9 is PGND (low-side source); pin 3 is AGND (analog reference ground); pin 4 is open-drain PG; pin 5 is SS (soft-start capacitor node); pin 6 is SW (switching node); pin 7 is BOOT (high-side gate drive supply); pin 2 is FB (feedback input); pin 10 is MODE (current limit selection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS56637RPAR and TPS56837HARPAR, the TPS56837HRPAR uniquely combines 8A capability, integrated output discharge, and three-mode current limiting - making it optimal for USB PD adapters and industrial systems requiring robust fault recovery and flexible current limiting.

Availability

TPS56837HRPAR is available at Aetrix Electronics and suitable for USB PD power adapters, industrial PCs, and video conferencing systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS56837HRPAR 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 technologies with broad industrial, automotive, and communications portfolio coverage.

The TPS56837H product line delivers high-efficiency, easy-to-use synchronous buck converters for USB PD and industrial point-of-load applications - designed to simplify power design while maintaining thermal robustness and protection integrity.

FAQ

What is the maximum duty cycle supported by the TPS56837HRPAR?

The TPS56837HRPAR supports up to 98% duty cycle operation, enabling high-voltage step-down applications such as 24V-to-20V conversion with minimal dropout. This capability is critical for USB PD 20V output stages where input voltage may dip near 22V under load, ensuring regulation is maintained without dropout or dropout-induced instability.

Does the TPS56837HRPAR require external compensation components?

No, the TPS56837HRPAR does not require external compensation components due to its D-CAP3™ control architecture. The internal adaptive on-time loop with ripple injection provides inherent stability across all load conditions and with ultra-low-ESR ceramic output capacitors, significantly reducing design complexity and BOM count compared to traditional voltage-mode or current-mode controllers.

How is the soft-start time configured on the TPS56837HRPAR?

The soft-start time on the TPS56837HRPAR is set by connecting an external capacitor between the SS pin (Pin 5) and AGND. Using Equation T_SS = C_SS × 0.6V / 6µA, a 22nF capacitor yields ~2.2ms minimum soft-start. Larger values increase ramp time linearly; floating the SS pin is prohibited and will cause malfunction.

What protection features are implemented in the TPS56837HRPAR?

The TPS56837HRPAR implements non-latched overvoltage (125% VOUT), undervoltage (65% VOUT), overtemperature (165°C), input UVLO (4.2V rise), and cycle-by-cycle overcurrent protections. All faults trigger automatic hiccup or foldback recovery without requiring external reset circuitry, ensuring reliable operation in unattended industrial and consumer systems.

Is the TPS56837HRPAR pin-compatible with other devices in the same family?

Yes, the TPS56837HRPAR is pin-to-pin compatible with the 6A TPS56637RPAR and the 8A TPS56837HARPAR, sharing identical 10-pin HotRod™ QFN (RPA) footprint, pin assignments, and layout recommendations - enabling scalable design reuse across current-rating tiers and discharge-function variants without PCB revision.