LP3913 Datasheet, PDF (62/70 Pages) Texas Instruments – Power Management IC for Flash Memory-Based Portable Media Players

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
LDO1 output voltage after power up
LDO2 output voltage after power up
BUCK1 output voltage after power up
BUCK2 output voltage after power up
BUCK3 power voltage after power up
Battery low threshold
Delay for LDO1 and LDO2
Delay for Buck1
Delay for Buck2
Delay for BucK3
Delay for NRST
Default Full Rate Charge Current
EOC Default
V_TERM Default
ONOFF Edge/Level
ONOFF Polarity
Buck1 Enable Polarity
LDO2 Enable Polarity
Ignore Ten Hour Timer
LED default current
Buck3 500 mA output current
Thermistor 10k/100k
Default Value
2.0V
3.3V
1.2V
3.3V
3.3V
2.90V
5 ms
15 ms
20 ms
25 ms
60 ms
100 mA
0.1C
4.2V
Level
Positive
Positive
Positive
No
10 mA
Yes
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 V_IN 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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