PMP4494

5V to 3.3V 1.2A DC-DC Converter with 200mS Vout Hold-up Time Circuit Reference Design

PMP4494

Design files

Overview

The PMP4494 is a 5V to 3.3V 1.2A DC-DC converter with a Vout hold-up circuit. The synchronous buck converter LM20242 is used in the design to provide high efficiency for the system voltage. A boost converter TPS61170 boosts an auxiliary rail from 10V up to 20V to provide the backup voltage. A supply voltage supervisor TLV809 monitors the system voltage and switches the supply to the backup voltage once the system voltage falls below the threshold voltage. Along with the boost circuit, the hold-up capacitance is significantly reduced while still meeting the 200mS hold-up time specification.

Features
  • Main power supply 5V to 3.3V 1.2A output synchronous buck
  • Back-up power supply  boost up from 10Vin to 20V hold-up voltage
  • Minimum 200ms hold-up time for 3.3V
  • Bus voltage monitor and switch
  • Size: 73.5mm x 50mm x 10mm
Output voltage options PMP4494.1 PMP4494.2
Vin (Min) (V) 5 10
Vin (Max) (V) 20 10
Vout (Nom) (V) 3.3 20
Iout (Max) (A) 1.2 .1
Output Power (W) 3.96 2
Isolated/Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC
Topology Buck- Synchronous Boost- Integrated Switch
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUCD6.PDF (401 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDRNO9.PDF (143 K)

Detailed schematic diagram for design layout and components

TIDRNP0.PDF (190 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRNP1.PDF (66 K)

Detailed overview of design layout for component placement

TIDRNP3.ZIP (26 K)

Files used for 3D models or 2D drawings of IC components

TIDCCO0.ZIP (185 K)

Design file that contains information on physical board layer of design PCB

TIDRNP2.PDF (255 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

LM202424.5-36V, 2A Current Mode Synchronous Buck Regulator with Adjustable Frequency

Data sheet: PDF
Boost converters (integrated switch)

TPS611701.2A Switch, 38V High Voltage Boost Converter in 2x2mm QFN Package

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP4494 Test Results Sep. 29, 2016

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