LP3921 Datasheet, PDF (14/41 Pages) National Semiconductor (TI) – Battery Charger Management and Regulator Unit with Integrated Boomer® Audio Amplifier

LP3921
SNVS580A – AUGUST 2008 – REVISED MAY 2013
TECHNICAL DESCRIPTION
DEVICE POWER UP AND SHUTDOWN TIMING
PWR_ON
30 ms Debounce time
PS_HOLD needs to be asserted while
PWR_ON is high.
PS_HOLD
LDO1
LDO2
RESET
LDO3
LDO7
RX_EN, TX_EN,
TCXO_EN
LDO4,5,6
87% Reg
< 200 Ps
87% Reg
60 ms
I²C Control
Note: Serial I/F commands only take place
after PS_HOLD is asserted.
Figure 2. Device Power Up Logic Timing: PWR_ON
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