AXP209 datasheet(24/45 Pages) ETC2

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AXP209

Enhanced single Cell Li-Battery and Power System Management IC

LDO1

LDO1 is always on and can be used to supply continuous power for application RTC with 30mA drive

ability of 30mA.

LDO2/3/4

LDO2/4 output noise is as low as 18uVrms，and can be used to supply power for analog circuits of

application system. LDO3 can supply power for systems like SRAM or PLL with 200mA drive ability.

LDO5

LDO5 also features the low noise design, and its drive ability is 50mA.

Soft Start

All DC-DCs and LDOs support soft start which can avoid the impact of dramatic current change on the

input path in system boot stage.

Self-diagnosis: Load monitoring and current limiting

All DC-DCs and LDOs support load monitoring and current-limit functions. When the load current

exceeds its drive ability, all output voltages will decrease to protect the internal circuits. When the two

DC-DCs output voltage is lower than 85% of the set voltage, AXP209 will automatically shutdown. At

the same time, the system will record the detailed output voltage that has lead to automatic shutdown

(refer to register REG46H[5:2]) and issue a corresponding IRQ.

All DC-DCs do not require external Schottky diodes and resister divider feedback circuits. If a certain

DC-DC is unnecessary in the application, just float the corresponding LX pins.

9.6 The default voltage/Start timing settings(Default Voltage / Timing Setting)

The AXP209 provides customizable default voltage settings of each power supply and start up timing.

Boot Timing: includes 8 levels, and the interval between each level can be set, from 1, 4, 16, 32 ms.

Default voltage setting: Each DC-DC / LDO can be set from the lowest to the highest voltage of the

range.

LDO1SET PIN For setting LDO1 initial voltage:

LDO1SET

LDO1SET = GND

LDO1SET = VINT

LDO1 Voltage

1.3V

3.3V

DC3SET PIN For setting DC-DC3 initial voltage:

DC3SET

DC3SET = GND

DC3SET = APS

DC3SET = floating

DC-DC3 Voltage

1.8V

3.3V / 2.5V

1.2V / 1.5V

For more information, see “The default configuration instructions” section.

Confidential

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