AXP209 is designed to be a highly-integrated power system management IC that is optimized for
applications requiring single-cell Li-battery (Li-Ion/Polymer) and multiple output DC-DC converters. It is
offering an easy-to-use and flexible complete solution which can fully meet the increasingly complexity
of accurate power control required by modern application processor system.
AXP209 Incorporates an adaptive USB-Compatible PWM Charger, 2 Buck DC-DC converters,5 Linear
regulators (LDOs), Voltage/Current/Temperature and other multi-channel 12-Bit ADC, as well as 4
Configurable GPIOs. To ensure power system safety and stability, the AXP209 also integrates over/under
(OVP / UVP), Over temperature(OTP), and Overcurrent (OCP) Protection circuits.
With Intelligent Power Select, IPS™ circuits, the AXP209 can distribute power safely and transparently
among external AC-adapter, Li-battery and application system load. It can still work normally when
there is no battery (e.g. deeply discharged/defective battery) but only external input power source.
The AXP209 provides a small, simple solution for obtaining power from three different power sources;
single-cell Li-Ion battery, USB port, and AC-adapter. It can also support a rechargeable backup battery
too.
To ensure compatibility with a wide range of system processors, AXP209 uses a Two Wire Serial
Interface (TWSI), through which application processor is capable of enabling/disabling power rails,
programming voltages, accessing internal registers, as well as measurement data (including Fuel
Gauge). With the power monitoring results of high precision (1%, determined by the 1% BIAS
resistance), end users will always know the real-time power consumption, which can bring them an
unprecedented experience of power management.
