20W SEPIC Low-Cost Lead Acid Battery Charger Reference Design


Design files


The PMP10081 reference design shows a simple and low-cost solution of a lead acid battery charger. The input voltage range is from 9V to 36V and the maximum output voltage is 13.8V, which is sufficient for a six-cell lead acid battery with a charge current up to 1.5A.

  • Built and tested
  • Small part count
  • Low-cost
  • Simple solution
Output voltage options PMP10081.1
Vin (Min) (V) 9
Vin (Max) (V) 36
Vout (Nom) (V) 13.8
Iout (Max) (A) 1.5
Output Power (W) 20.7
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Sepic- CCM
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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.

TIDUAO5.PDF (1389 K)

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

TIDRH53.PDF (144 K)

Detailed schematic diagram for design layout and components

TIDRH54.PDF (82 K)

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


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


Includes TI products in the design and potential alternatives.

Boost controllers (external switch)

TPS402104.5~52V Wide Input Range Boost/SEPIC/Flyback DC-DC Controller

Data sheet: PDF | HTML
General-purpose op amps

TLC272Dual, 16-V, 2-MHz, In to V- operational amplifier

Data sheet: PDF
N-channel MOSFETs

CSD18563Q5A60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 6.8 mOhm

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP10081 Test Results Sep. 22, 2015

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