AXP152

The AXP152 is the PMIC (Power Management IC) developed by X-Powers, a sister company of Allwinner.

Overview
AXP152 is a highly integrated power management IC that provides easy and flexible power solution for applications that require multi-rail outputs. It has fully met the increasingly complex needs of application processors on accurate power control.

AXP152 integrates an adaptive and USB-compatible PWM charger, four step-down converters (Buck DC-DC converter), seven low dropout regulators. It also Featuress protection circuitry such as over/under-voltage protection (OVP/UVP), over-temperature protection, and over-current protection (OCP) to guarantee the power system security and stability.

In addition, AXP152 includes a Two Wire Serial Interface (TWSI), through which the application processor is capable of enabling/disabling some power outputs, programming the voltage to decrease the power consumption, and provides customers with unprecedented experience of power management.

AXP152 is available in an 5mm x 5mm 40-pin QFN package.

Features

 * 4*Buck DC-DC Converters
 * DC-DC1：PFM/PWM mode,scaling in 1.7-3.5V,50mV/step，Output current 1A
 * DC-DC2：PFM/PWM mode,scaling in 0.7-2.275V,25mV/step,Output current 2A, DVM
 * DC-DC3：PFM/PWM mode,scaling in 1.7-3.5V,50mV/step,Output current 1.2A
 * DC-DC4：PFM/PWM mode,scaling in 1.7-3.5V,25mV/step,Output current 1.2A


 * System Management
 * Support software shutdown or hardware power off
 * External wakeup source
 * Output monitor
 * PWROK signal for reset or power off
 * OVP/UVP
 * Programable power on voltage or sequence


 * 7 LDOs
 * LDO0：Output current 1.5A,Internal 500/900/1500mA current limited option
 * RTCLDO：On for RTC31,Output 3.1V, One for RTC13,Output 1.3/1.8V
 * ALDO1：Analog LDO,scaling in 1.2-3.3V, 300mA
 * ALDO2：Analog LDO,scaling in 1.2-3.3V, 300mA
 * DLDO1：Digtal LDO or Switch,scaling in 0.7-3.5V,100mV/step,300mA
 * DLDO2：Digtal LDO or Switch,scaling in 0.7-3.5V,100mV/step,300mA
 * GPIOLDO：Low noise LDO, scaling in 0.7-3.5V,100mV/step,30mA


 * Host Interface
 * Programable Interrupt and wakeup management
 * Multi-function Pins
 * Internal Timer

Regulators
This section corresponds to section 9.2 in the datasheet.

The AXP152 features 4 DC-DC step-down (buck) converters, and 7 linear regulators. The DC-DC converters operate in automatic (PFM + PWM) or PWM mode, controllable via reg 80h, at a default frequency of 2.25 MHz. The frequency is controlled via reg 37h. It also supports spread spectrum.

Interrupts
This section corresponds to section 9.6 in the datasheet.

The AXP221 pulls the IRQ pin low to signal an interrupt to the host, and stores the interrupt status in the interrupt status registers (48h ~ 4Ch). Writing 1 to the corresponding bit clears the interrupt. When there are no interrupts, the IRQ pin is pulled up (by an external 51KΩ resistor). Each interrupt can be masked via the interrupt control registers (40h ~ 44h).

Spec Sheets
AXP152 Datasheet v1.0 (PDF, 34 pages, 2012-04-01)