LP3921 Datasheet, PDF (3/41 Pages) National Semiconductor (TI) – Battery Charger Management and Regulator Unit with Integrated Boomer® Audio Amplifier

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Functional Block Diagram
AC Adapter or
VBUS supply
4.5V to 6V
10 PF
LP3921
SNVS580A – AUGUST 2008 – REVISED MAY 2013
V_BATT
+
10 PF
Battery
10 PF
IMON
ACOK_N
LDO2
Linear Charger
LDO2
1.5k
1.5k
320 ms
debounce
SDA
SCL
PON_N
PS_HOLD
RESET_N
HF_PWR
PWR_ON
V_BATT
O/D output
LDO2
320 ms
debounce
30 ms
debounce
Serial
Interface
and Control
LP3921
VDD
1.0 PF
Thermal
Shutdown
UVLO
Voltage
Reference
- Differential Input
+ Differential Input
V_O+
20k
20k
-IN
20k
+IN
20k
V_O-
Shut Down
BOOMER AUDIO
LDO1
LDO2
LDO3
LDO4
LDO5
LDO6
LDO7
LDO1
1 PF
CORE
1.8V
@300 mA
LDO2
1 PF
DIGI
3.0V
@300 mA
LDO3 ANA
3.0V
1 PF ^{@80 mA}
TCXO_EN
LDO4
1 PF
TCXO
3.0V
@80 mA
RX_EN
LDO5 _RX
3.0V
1 PF
@150 mA
TX_EN
LDO6 _TX
3.0V
1 PF @150 mA
LDO7 _GP
3.0V
1 PF @150 mA
V_O+
V_O-
R_L 8:
1.0 PF
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