AXP209 datasheet(23/45 Pages) ETC2

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AXP209

Enhanced single Cell Li-Battery and Power System Management IC

9.5 Multi-channel power output

AXP209 provides multiple Output voltages as follows:

Output

path

Type

Default voltage

Application

examples

Drive capability

DCDC2

BUCK

Configurable

1.25Vcore

1600 mA

DCDC3

BUCK

Configurable

2.5Vddr

700 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

AXP209 comes with two synchronous step-down DC-DCs, five LDOs, as well as multiple timing and

controlling methods. The operating frequency of DC-DC converters 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

AXP209 load). See register REG80H.

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;

when the output voltage is set above 2.5V，2.2uH inductors is recommended; when the output

voltage is set under 2.5V, 4.7uH inductors is recommended. Besides, the inductor saturation current

should be more than 50% of the largest demanded current.

The following is a list of recommended inductor-capacitor:

Inductor

Model

Current specifications

DC resistance

Murata LQH55PN2R2NR0

2100mA@2.2uH

30mOhm

Murata LQH55PN4R7NR0

1400mA@4.7uH

60mOhm

Murata LQH44PN2R2MP0

2000mA@2.2uH

49mOhm

Murata LQH44PN4R7MP0

1700mA@2.2uH

80mOhm

TDK VLF5010ST-2R2M2R3

2700mA@2.2uH

41mOhm

TDK VLF5014ST-4R7M1R7

1700mA@4.7uH

98mOhm

TDK SLF6045T-4R7N2R4-3PF

2400mA@4.7uH

27mOhm

Capacitor

Model

Temperature characteristics

Tolerance

TDK C2012X5R0J475K

X5R / X7R

10%@4.7uF

TDK C2012X5R0J106K

X5R / X7R

10% @ 10uF

Murata GRM31E71A475K

X7R

10%@4.7uF

Murata GRM21E71A106K

X7R

10% @ 10uF

Murata GRM31E71A106K

X7R

10% @ 10uF

Confidential

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