480-W, 97% η efficiency, Ultra-Compact (480W/in3), Bi-Directional DC-DC Reference Design
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Key Document


The TIDA-00705 is an ultra-compact (1”x1”x1”) high efficiency bi-directional DC-DC power converter capable of delivering 480W for use in Local Energy Storage (LES) and Battery Back-up power applications, specifically designed for server PSUs embedded with battery backup units (BBU). The reference design is based on a 2 phase interleaved half-bridge power stage controlled using the UCD3138 digital power controller.The design has built-in Protection for DC-bus Over-current, Over-voltage & Battery Over Current, Overvoltage and has phase current balancing to distribute the heat.

  • High efficiency of 97% as backup power supply, optimizes thermal management and extends battery backup time
  • Ultra-compact unit with heatsink built-in (1”x1”x1”) and effective thermal management makes it a retrofit into existing server PSUs 
  • Delivers high power output 40A/12V as back-up supply and charges battery at 6A during normal operation
  • Built-in battery charging CC-CV algorithm compatible for Li-ion and Li-Poly batteries
  • Delivers continuous power output of >300W at minimal airflow of 200LFM and 190W without any airflow
  • UCD3138A digital power supply controller solution enables programmability and configurability for different voltages and currents

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Schematic/Block Diagram

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Design Guide

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Design Files

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TIDA-00705-FW :
TIDA-00705 Firmware for UCD3138A



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
ISO7321C  Low-power, dual-channel, 1/1, 25-Mbps digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
LM4041A12  1.2-V precision micropower shunt voltage reference with 0.1% accuracy  Voltage references  Sample & Buy Not Available
OPA2192  36-V, Precision, RRIO, Low Offset Voltage, Low Input Bias Current Op Amp With e-trim  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS62125  3V-17V, 300mA Buck Converter With Adjustable Enable Threshold And Hysteresis  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
UCC27211A  4-A, 120-V half bridge gate driver with 8-V UVLO and negative voltage handling  Gate drivers  Sample & Buy Not Available
UCD3138A  UCD3138A Highly Integrated Digital Controller for Isolated Power  Digital power ICs  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ISO7321C Download Download
LM4041A12 Download Download
Download -
Download Download
OPA2192 Download
TPS62125 Download Download
UCC27211A Download
UCD3138A Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 4911 02 Mar 2017
Design files (6)
Title Type Size (KB) Date
PDF 195 30 Mar 2017
ZIP 1106 11 Oct 2016
ZIP 7080 11 Oct 2016
ZIP 302 11 Oct 2016
ZIP 94 11 Oct 2016
PDF 331 11 Oct 2016

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