Automotive Range SEPIC Converter Delivers 4.5V@5.5A Reference Design

(ACTIVE) PMP8903

Description & Features

Technical Documents

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Description

In today’s start-stop systems, it is common for battery voltages to dip well below the nominal 12V rating. PMP8903 represents a very common start-stop application where that battery voltage can drop as low as 5V, and a 5V output is still needed for CAN and also as an intermediate bus. This design also features two tiny synchronous low-voltage buck regulators generating 3.3V and 1.1V from the 5V intermediate rail, contributing to an overall solution size that is very compact for space-constrained automotive environments. For an additional output voltage version of the design, see PMP8903.2

Features
  • 100% duty cycle capability
  • 5V to 42V Input
  • 5V output at 3.25A (LM3481 output)
  • 1.1V output at 2A (TLV62065)
  • 3.3V output at 1A (TLV62065)
  • This example design is supported with design and test files


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Schematic/Block Diagram

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Test Data

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Design Files

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Bill of Materials (BOM)

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Parametrics
 PMP8903.1
(Output Voltage 1)
PMP8903.2
(Output Voltage 2)
PMP8903.3
(Output Voltage 3)
Vin (Min) (V)54.54.5
Vin (Max) (V)425.55.5
Vout (Nom) (V)53.31.1
Iout (Max) (A)3.2512
Output Power (W)16.253.32.2
Isolated/Non-IsolatedNon-IsolatedNon-IsolatedNon-Isolated
Input TypeDCDCDC
TopologySepic- CCMBuck- SynchronousBuck- Synchronous

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM3481  2.97V to 48V High-Efficiency Controller for Boost, SEPIC and Flyback  Step-up (boost)  Sample & Buy View Design Kits & Evaluation Modules
TLV62065  3MHz 2A Step Down Converter in 2x2 SON Package  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM3481 Download Download
TLV62065 Download Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views
PDF 1588 22 May 2013 6
Design files (4)
Title Abstract Type Size (KB) Date Views
ZIP 315 12 Jul 2013 7
PDF 316 22 May 2013 8
PDF 191 22 May 2013 4
PDF 32 22 May 2013 11

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