Bi-directional Battery Power System +USB A 5V2A Output Reference Design


Design files


The PMP40294 reference design is designed for a high capacity battery packs which requires more and more charging and discharging power. It can support a wide input voltgae (5~20V) from any adaptor and deliver the maximal charging current up to 3A to a 3S battery pack. By adopting the bi-directional buck-boost controller BQ25703A, the power stream can be flowed bidirectionally in the same power stage. In reverse mode, it can deliver 5/9/12/14.5/15/16/19/20V 3A from batteries to the port. The digital progemmability provides further extended functions as well.  

  • Bi-directional power flow
  • Wide input voltage range from 5V to 20V
  • Eight output voltage options
  • Digital programmability
  • Small size with low component count
Output voltage options PMP40294.1 PMP40294.2 PMP40294.3 PMP40294.4 PMP40294.5
Vin (Min) (V) 5 5 5 5 5
Vin (Max) (V) 20 20 20 20 20
Vout (Nom) (V) 5 9 12 15 20
Iout (Max) (A) 3 3 3 3 2.25
Output Power (W) 15 27 36 45 45
Isolated/Non-Isolated Non-Isolated Non-Isolated Non-Isolated Non-Isolated Non-Isolated
Input Type DC DC DC DC DC
Topology Buck Boost- 4 Switch Buck Boost- 4 Switch Buck Boost- 4 Switch Buck Boost- 4 Switch Buck Boost- 4 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.

TIDUDS6.PDF (2871 K)

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


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRTB9.ZIP (1802 K)

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


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

TIDRTB8.PDF (1625 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Battery charger ICs

BQ25703AI2C 1-4 cell NVDC Buck-Boost battery charge controller with system power monitor & processor

Data sheet: PDF | HTML
Buck converters (integrated switch)

TLV621303-17V 3A Step-Down Converter in 3x3 QFN Package

Data sheet: PDF | HTML
ESD & surge protection ICs

TPD2E1B06Dual 1-pF, ±5.5-V, ±10-kV ESD protection diode with ESD rating for USB 2.0

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

TPS709150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection and enable

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430G295516 MHz MCU with 56KB Flash, 2KB SRAM, 10-bit ADC, comparator, UART/SPI/I2C, timer

Data sheet: PDF
N-channel MOSFETs

CSD17308Q330-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 11.8 mOhm

Data sheet: PDF | HTML
N-channel MOSFETs

CSD17571Q230-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 29 mOhm

Data sheet: PDF | HTML
P-channel MOSFETs

CSD25404Q3-20-V, P channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 6.5 mOhm

Data sheet: PDF | HTML
P-channel MOSFETs

CSD25483F4-20-V, P channel NexFET™ power MOSFET, single LGA 0.6 mm x 1 mm, 245 mOhm, gate ESD protection

Data sheet: PDF | HTML
USB power switches & charging port controllers

TPS2514AUSB dedicated charging port controller - Gen 2

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP40294 Test Results Nov. 03, 2017

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