Battery back-up switch, charger and monitor reference design


Design files


A complete battery back-up, charger and monitoring is implemented with this reference design.  It includes switching between a 12/24-Vdc source and 12/24-V lead acid battery, constant current battery charging at 1A typical, battery maintenance float charge and monitoring circuits for the battery and input source.

  • Switches with reverse current protection
  • 16-A continuous current from DC source or battery
  • Constant current battery charging at 1 A
  • Battery maintenance float charging
  • Input LED and output LED status signals
Output voltage options PMP22125.1 PMP22125.2
Vin (Min) (V) 8.5 18.5
Vin (Max) (V) 17.5 36.5
Vout (Nom) (V) 12 24
Iout (Max) (A) 1 1
Output Power (W) 12 24
Isolated/Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC
Topology Buck Boost- 4 Switch^Hot Swap Buck Boost- 4 Switch^Hot Swap
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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.

TIDT181.PDF (2263 K)

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

TIDM595.PDF (464 K)

Detailed schematic diagram for design layout and components

TIDM596.PDF (334 K)

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

TIDM597.PDF (415 K)

Detailed overview of design layout for component placement

TIDM599.ZIP (1662 K)

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

TIDCFU9.ZIP (1640 K)

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

TIDM598.PDF (2025 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC controllers (external FET)

LM517655V wide VIN synchronous 4-switch buck-boost controller

Data sheet: PDF | HTML
AND gates

SN74LVC2G082-ch, 2-input 1.65-V to 5.5-V 32 mA drive strength AND gate

Data sheet: PDF | HTML
Analog current-sense amplifiers

INA30136V, 550kHz, 4V/µs, high-precision current sense amplifier w/ comparator

Data sheet: PDF | HTML

TLV6710Low power, high voltage window comparator with integrated reference

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS7A16100-mA, 60-V, ultra-low-IQ, low-dropout (LDO) voltage regulator with power good and enable

Data sheet: PDF | HTML
Load switches

TPS22929D5.5-V, 1.8-A, 115-mΩ load switch with output discharge

Data sheet: PDF | HTML

CSD17313Q230-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 32 mOhm

Data sheet: PDF | HTML

CSD18531Q5A60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 4.6 mOhm

Data sheet: PDF | HTML

CSD18543Q3A60-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 9.9 mOhm

Data sheet: PDF | HTML
Noninverting buffers & drivers

SN74LVC1G07Single 1.65-V to 5.5-V buffer with open-drain outputs

Data sheet: PDF | HTML
Supervisor & reset ICs

TPS3803Low-power voltage detector

Data sheet: PDF
Voltage translating gates

SN74LV1T32Single Power Supply 2-INPUT POSITIVE OR GATE with Logic Level Shifter

Data sheet: PDF | HTML
eFuses & hot swap controllers

LM50605.5-V to 65-V high side protection controller

Data sheet: PDF | HTML

Technical documentation

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* Test report Battery Back-up Switch, Charger and Monitor Reference Design May 13, 2020

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