High efficient 32-V / 3-A synchronous 4-switch buck-boost reference design
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Key Document


This telecom reference design features a highly effective 100-W, 4-switch buck-boost. The converter allows to drive a 32-V RF LDMOS out of a wide input range 17 V to 57 V with peak efficiency 98% plus. An input filter is implemented to reduce conducted emissions to source. Additionally, a spread spectrum function and/or fixed PWM mode can be activated through a jumper. Lastly, the switching frequency can be synchronized by base station oven oscillator (30.72 MHz/128 = 240 kHz) to improve radio frequency performance.

  • The highest efficiency of up to 98.7% due to synchronous rectification in both operating modes
  • A 4-switch buck boost topology supports step up and step down with a single inductor
  • A transient response of greater than 2% for 50% load change

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(Output Voltage 1)
Vin (Min) (V)17
Vin (Max) (V)52
Vout (Nom) (V)32
Iout (Max) (A)3
Output Power (W)96
Input TypeDC
TopologyBuck Boost- 4 Switch

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5176  55V wide VIN synchronous 4-switch buck-boost controller  Buck-boost & inverting regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM5176 Download Download

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Technical documentation

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User guide (2)
Title Type Size (KB) Date
PDF 1758 19 Dec 2018
PDF 1093 02 May 2017
Design files (6)
Title Type Size (KB) Date
ZIP 159 19 Dec 2018
ZIP 212 19 Dec 2018
PDF 1386 19 Dec 2018
PDF 207 19 Dec 2018
PDF 99 19 Dec 2018
PDF 198 19 Dec 2018

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