4.5-V to 28-V input, 6-A synchronous buck converter with ULQ-mode


Product details


Vin (Min) (V) 4.5 Vin (Max) (V) 28 Vout (Min) (V) 0.6 Vout (Max) (V) 16 Iout (Max) (A) 6 Iq (Typ) (uA) 125 Switching frequency (Min) (kHz) 500 Switching frequency (Max) (kHz) 500 Features Enable, Forced PWM, Light Load Efficiency, Pre-Bias Start-Up, Synchronous Rectification, UVLO Adjustable, Soft Start Fixed Operating temperature range (C) -40 to 150 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

VQFN-HR (RPA) 10 9 mm² 3 x 3 open-in-new Find other Buck converters (integrated switch)


  • 4.5-V to 28-V input voltage range
  • 0.6-V to 13-V output voltage range
  • 6-A maximum continuous output current
  • Integrated 26-mΩ and 12-mΩ MOSFETs
  • 0.6-V ±1% Reference Voltage
  • D-CAP3™ control mode for fast transient response
  • Eco-mode™ and FCCM (forced continuous conduction mode) selectable for light-load operation through MODE pin
  • Internal 2-ms soft start
  • Built-in output discharge function
  • 500-kHz switching frequency
  • Power good indicator to monitor output voltage
  • Cycle by cycle over current limit
  • Non-latched protections for UV, OV, OT and UVLO
  • –40°C to +150°C operating junction temperature
  • Small 10-Pin 3.0-mm × 3.0-mm HotRod™ QFN Package
  • Available in WEBENCH® Power Designer to create custom designs

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The TPS56637 is a high efficiency, high-voltage input, easy-to-use synchronous buck converter with integrated MOSFETs.

With the wide operating input voltage range of 4.5 V to 28 V, the TPS56637 is ideally suited for systems powered from 12-V, 19-V, 24-V power-bus rails. It supports up to 6-A continuous output current at output voltages between 0.6 V and 13 V.

The TPS56637 uses DCAP3™ control mode to provide fast transient response, good line and load regulation, no requirement for external compensation, and supports low equivalent series resistance (ESR) output capacitors such as POSCAP and MLCC.

The TPS56637 has both FCCM and Eco-mode™ operation modes for selection at light-load condition through configuration of MODE pin. To attain high efficiency at light load, Eco-mode™ could be selected. To support tight output voltage ripple requirement, FCCM could be selected.

The TPS56637 provides complete non-latched OV (Over-voltage), UV (Under-voltage), OC (Over-current), OT (Over-temperature) and UVLO (Under-voltage lock-out) protections combined with power good indicator and output discharge function features.

The TPS56637 is available in a 10-pin 3.0-mm x 3.0-mm HotRod™ QFN package and the junction temperature is specified from –40°C to 150°C.

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Technical documentation

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Type Title Date
* Datasheet TPS56637 4.5-V to 28-V Input, 6-A Synchronous Buck Converter datasheet (Rev. A) Apr. 11, 2019
Selection guide Buck Converter Quick Reference Guide (Rev. A) Mar. 31, 2020
User guide TPS56637EVM-029 6-A, Regulator Evaluation Module (Rev. A) Sep. 11, 2019
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Application note Optimize Output Filter on D-CAP2 for Stability Improvement Jun. 13, 2017

Design & development

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Hardware development

The TPS56637 is an adaptive on-time D-CAP3™ mode synchronous step-down DC-DC converter, and is able to deliver 6-A continuous output current. This switch mode power supply (SMPS) IC is optimized for applications require very low-power consumption, such as printers, DTV and monitor, by (...)
  • 4.5-V to 28-V Wide Input Range
  • Wide Output Voltage Range: 0.6 V to 16 V
  • 500-kHz D-CAP3™ Mode for Fast Transient Response with Ceramic Output Capacitors
  • Integrated 31-mΩ and 15-mΩ MOSFETs for High Efficiency

Design tools & simulation

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CAD/CAE symbols

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