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4 A switching mode battery charger with power path
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The PM2131 is a fully integrated 4 A switching mode battery charger built upon a dual 2.0 A DC-DC down converter with integrated FET. This dual converter structure allows high efficiency at high current with small size external components. The two paths can remain separated when needed.

The battery CCCV charging mode is either fully autonomous when operating in standalone or software controlled by the host. Multiple charging parameters can be modified or monitored by I²C and through interrupt pin with several default settings. Also, the PM2131 permanently monitors several key parameters for charging algorithm and safety. The PM2131 features the power-path mode which allows the system to run in empty battery conditions and battery aging to be improved when the wall outlet adapter is plugged.

The PM2131 is ideal for tablets and smartphones. It fits perfectly portable/mobile devices and large battery capacity applications with parallel single cell Li-ion battery pack requiring fast charging.

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Key Features

  • 4 A DC/DC step-down battery charger
  • High efficiency up to 92%
  • Operation at 1.6 MHz with a 1 μH coil
  • Dual paths with 2.0 A integrated power field-effect transistor (FET)
  • Constant current constant voltage (CCCV) mode
  • Flexible charge parameter programming with predefined configurations
  • Compliant with multiple battery chemistry (LiCO2, LiFePO4, Ni-rich)
  • Output current regulation
  • High accuracy voltage regulation: <1%
  • Compliant with USB battery charging specification 1.2 and USB standard 2.0
  • External power source detections and charger priority control
  • Battery charger safety and protection
  • 20 V absolute maximum input voltage ratings
  • Up to 16 V operating voltage
  • Input overvoltage and overcurrent protection
  • Safety timer with reset control
  • Reverse polarity and leakage protection
  • Down -2 V input voltage protection
  • Battery and die thermal protections
  • Current sensing and built-in current limiting
  • Battery overvoltage protection and anti-overshoot algorithm
  • Compliant with IEEE 1725-2006, JISC8714 (Japan), CTTL YDT1591 (China) standards
  • Boost mode
  • For USB On-The-Go supply to provide 5 V and 1 A on VBUS when A device
  • Programmable boost voltage: 4.5 V, 5.0 V, 7.0 V and 11.0 V with 5 W max.
  • No external component needed
  • Miscellaneous
  • Power-path mode with external FET and internal current source for empty battery case
  • I²C™ control
  • LED driver for charging indicator
  • Interrupt and wakeup signal
  • Autonomous charging algorithm or software control by system
  • External power source optimization loop

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS9646: 4 A switching mode battery charger with power path
5.0 1,873 KB

User Manual

Description Version Size
UM1768: The PM2131 evaluation board
1.0 2,349 KB

Presentations & Training Material


Description Version Size
Power management for handheld and portable applications
734 KB

Publications and Collaterals

Selection Guides

Description Version Size
Linear and Switching Voltage Regulators Selection Guide
384 KB

Sample & Buy

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