12-V / 100-A negative-to-positive synchronous buck-boost reference design for power amplifiers
PMP21867
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Key Document

Description

This reference design is a negative-to-positive synchronous buck-boost converter for power amplifier applications. The circuit is powered from the nominal -48-V system source to provide an output voltage of +12 V at 100 A. The design uses two dual synchronous boost controllers for 4-phase operation at a switching frequency of 100 kHz. Output voltage adjustment to +14.5 V is jumper selectable. 1- through 4-phase operation is also jumper selectable.

Features
  • Non-isolated inverting solution for higher power
  • Excellent phase current sharing for balanced thermal performance
  • Jumper selectable phase control
  • Mounting option for bottom-side heat sink
  • Jumper selectable output voltage control

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Design Guide

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Design Files

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Parametrics
 PMP21867.1
(Output Voltage 1)
Vin (Min) (V)-36
Vin (Max) (V)-60
Vout (Nom) (V)12
Iout (Max) (A)100
Output Power (W)1200
Isolated/Non-IsolatedNon-Isolated
Input TypeDC
TopologyBuck Boost- Synchronous

TI Devices (6)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM26LV  1.6V-Capable Temperature Sensor Switch with Factory Programmed Trip Points  Temperature sensors  Sample & Buy View Design Kits & Evaluation Modules
LM4040-N  100-ppm/°C precision micropower shunt voltage reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
LM5018  7.5-100V Wide Vin, 300mA Constant On-Time Synchronous Buck Regulator  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules
LM5170-Q1  Multiphase Bidirectional Current Controller  Buck-boost & inverting  Sample & Buy View Design Kits & Evaluation Modules
LM8261  RRIO, High Output Current & Unlimited Cap Load Op Amp in SOT23-5  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS709  150-mA 30-V ultra-low-IQ wide-input low-dropout (LDO) regulator with reverse current protection  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM26LV Download Download
LM4040-N Download Download
Download Download
Download Download
LM5018 Download Download
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LM5170-Q1 Download -
LM8261 Download Download
TPS709 Download
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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 2875 10 Sep 2019
Design files (6)
Title Type Size (KB) Date
ZIP 897 10 Sep 2019
ZIP 2513 10 Sep 2019
PDF 3459 10 Sep 2019
PDF 312 10 Sep 2019
PDF 107 10 Sep 2019
PDF 690 10 Sep 2019

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