97% efficiency, 125W, Wide input Synchronous 4-Switch Buck-Boost Battery Charger Reference Design


Design files


PMP10594 is a synchronous 4-switch buck-boost converter reference design which utilizes the LM5175 controller for battery charger applications. The output voltage set point can be adjusted by a PWM signal over the range of 7.1V to 9.2V. I2C programming allows independent control of the average input current and charge current. Full scale input current limiting is 6A, while charge current is programmable to 12.5A. The LM5175 average current loop sets a maximum output current of 20A, which should never engage under normal circumstances. Additional pulse-by-pulse current limiting is inherent in the current-mode controller, making this a very robust design. A battery disconnect switch is used to provide trickle charging if the battery voltage is less than 6V.

  • 115W maximum output power
  • 97% peak efficiency
  • PWM adjustable output voltage
  • 12C programmable iniput and charge currents
  • Synchronizable to external clock
Output voltage options PMP10594.1
Vin (Min) (V) 4.5
Vin (Max) (V) 22.5
Vout (Nom) (V) 9.2
Iout (Max) (A) 12.5
Output Power (W) 115
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck Boost- 4 Switch
Personal electronics
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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.

TIDUDY4.PDF (2651 K)

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

TIDRU46.PDF (243 K)

Detailed schematic diagram for design layout and components

TIDRU47.PDF (104 K)

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

TIDRU48.PDF (151 K)

Detailed overview of design layout for component placement

TIDRU50.ZIP (963 K)

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

TIDCE57.ZIP (306 K)

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

TIDRU49.PDF (1098 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Analog current-sense amplifiers

INA19926V, bi-directional current sense amplifier

Data sheet: PDF | HTML
Buck-boost & inverting controllers (external switch)

LM517542V Wide Vin 4-Switch Synchronous Buck-Boost Controller

Data sheet: PDF | HTML
Digital potentiometers (digipots)

TPL0102-100256-tap dual-channel digital potentiometer with I2C interface and nonvolatile memory

Data sheet: PDF | HTML
General-purpose op amps

TLV272Dual, 16-V, 3-MHz operational amplifier

Data sheet: PDF | HTML
Noninverting buffers & drivers

SN74LVC1G34Single 1.65-V to 5.5-V buffer

Data sheet: PDF | HTML
P-channel MOSFETs

CSD25402Q3A-20-V, P channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 8.9 mOhm

Data sheet: PDF | HTML
Power blocks

CSD87330Q3D30-V, N channel synchronous buck NexFET™ power MOSFET, SON 3 mm x 3 mm power block, 20 A

Data sheet: PDF | HTML
Power blocks

CSD87353Q5D30-V, N channel synchronous buck NexFET™ power MOSFET, SON 5 mm x 6 mm power block, 40 A

Data sheet: PDF | HTML
Shunt voltage references

LM4312%, 1%, or 0.5% accuracy, adjustable precision Zener shunt regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP10594 Test Results Dec. 06, 2017

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