AXP202 datasheet(23/48 Pages) ETC2

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Single Cell Li-Battery PWM Charger and Power System Management IC

AXP202

AXP202 will automatically detect the battery presence, record the result in registers (refer to REG01H)

and release IRQ13, IRQ14.

The battery detection can be enabled and disabled by Host. (Refer to register REG32H.)

9.4 Backup Batttery

AXP202 supports backup battery charge and discharge. When no main power (BAT/ACIN/VBUS) is

available, LDO1 will choose the backup battery to support the operation of some circuits, such as the

system real-time clock, etc.

When there is a main power, REG35H[7] can be set to charge the backup battery, whose target voltage

is 3.0V by default (adjustable via REG35H[6:5]) and charge current is 200uA by default ( adjustable via

REG35H[1:0]).

9.5 Multi-Power Outputs

The following table has listed the multi-power outputs and their functions of AXP202.

Output Path

Type

Default

Voltage

Application

Examples

Drive Ability

DCDC2

BUCK

Configurable

1.25Vcore

1800 mA

DCDC3

BUCK

Configurable

2.5Vddr

1000 mA

LDO1

LDO

Configurable

RTC

30 mA

LDO2

LDO

Configurable

Analog/FM

200 mA

LDO3

LDO

Configurable

1.3V PLL

200 mA

LDO4

LDO

Configurable

1.8V HDMI

200 mA

LDO5

LDO

Configurable

Vmic

50 mA

AXP202 comes with two synchronous step-down DC-DCs, five LDOs, as well as multiple timing and

controlling methods. The work frequency of DC-DC is 1.5MHz by default, which is adjustable via

registers. External small inductors and capacitors can be connected as well. In addition, both DC-DCs

can be set in PWM mode or auto mode (automatically switchable according to the AXP202 load). See

DC-DC2/3

DCDC3 output voltage ranges from 0.7 V to 3.5V，and output voltage of DCDC2 is ranged from

0.7-2.275V，which can be programmed via registers.(refer to “ register REG23H 27H”).

DCDC2/3 output capacitor is recommended to use small ESR ceramic capacitors above 10uF X7R；

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