LP3913 datasheet(62/70 Pages) TI1

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LP3913

SNVS489I – NOVEMBER 2006 – REVISED SEPTEMBER 2013

www.ti.com

Factory Programmable Options

The following options are programmed for the LP3913. The system designer that needs specific options is

advised to contact the local TI sales office.

Factory programmable options

Default Value

LDO1 output voltage after power up

2.0V

LDO2 output voltage after power up

3.3V

BUCK1 output voltage after power up

1.2V

BUCK2 output voltage after power up

3.3V

BUCK3 power voltage after power up

3.3V

Battery low threshold

2.90V

Delay for LDO1 and LDO2

5 ms

Delay for Buck1

15 ms

Delay for Buck2

20 ms

Delay for BucK3

25 ms

Delay for NRST

60 ms

Default Full Rate Charge Current

100 mA

EOC Default

0.1C

VTERM Default

4.2V

ONOFF Edge/Level

Level

ONOFF Polarity

Positive

Buck1 Enable Polarity

Positive

LDO2 Enable Polarity

Positive

Ignore Ten Hour Timer

LED default current

10 mA

Buck3 500 mA output current

Yes

Thermistor 10k/100k

100k

The I2C Chip ID address is offered as a metal mask option. The current value equals 60 hex.

PCB Layout Considerations

For good performance of the circuit, it is essential to place the input and output capacitors very close to the

circuit and use wide routing for the traces allowing high currents.

Sensitive components should be placed far from those components with high pulsating current.

Decoupling capacitors should be close to circuit’s VIN pins. Digital and analog ground should be routed

separately and connected together in a star connection.

It’s good practice to minimize high current and switching current paths.

LDO Regulators

Place the filter capacitors very close to the input and output pins. Use large trace width for high current carrying

traces and the returns to ground.

BUCK Regulators

Place the supply bypass, filter capacitor and inductor close together and keep the traces short. The traces

between these components carry relatively high switching current and act as antennas. Following these rules

reduces radiated noise.

Arrange the components so that the switching current loops curl in the same direction.

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