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AXP209 Datasheet(PDF) 24 Page - List of Unclassifed Manufacturers

Part No. AXP209
Description  Enhanced single Cell Li-Battery and Power System Management IC
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Maker  ETC2 [List of Unclassifed Manufacturers]
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AXP209 Datasheet(HTML) 24 Page - List of Unclassifed Manufacturers

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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
Page 24/45


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