LP3918 Datasheet, PDF (3/30 Pages) National Semiconductor (TI) – Battery Charge Management and Regulator Unit

LP3918 Pin Descriptions
Pin #
Name
A1 IMON
A2 PS_HOLD
A3 VSS
A4 RESET_N
A5 ACOK_N
B1 CHG_IN
B2 PWR_ON
B3 SCL
B4 PON_N
B5 LDO7
C1 BATT
C2 HF_PWR
C3 SDA
C4 TX_EN
C5 LDO6
D1 VIN1
D2 TCXO_EN
D3 GNDA
D4 RX_EN
D5 LDO5
E1 LDO1
E2 LDO2
E3 LDO3
E4 LDO4
E5 VIN2
Type
Description
A Charge current monitor output. This pin presents an analog voltage representation of the
input charging current. VIMON(mV) = (2.47 x ICHG)(mA).
DI Input for power control from external processor/controller.
G Digital Ground pin
DO Reset Output. Pin stays LOW during power up sequence. 60ms after LDO1 (CORE) is
stable this pin is asserted HIGH.
DO AC Adapter indicator, LOW when 4.5V – 6.0V present at CHG_IN.
P DC power input to charger block from wall or car power adapters.
DI Power up sequence starts when this pin is set HIGH. Internal 500kΩ pull-down resistor.
DI Serial Interface Clock input. External pull up resistor is needed, typ 1.5kΩ
DO Active low signal is PWR_ON inverted
A LDO7 Output (GP)
P Main battery connection. Used as a power connection for current delivery to the battery.
DI Power up sequence starts when this pin is set HIGH. Internal 500kΩ pull-down resistor.
DI/O Serial Interface, Data Input/Output Open Drain output, external pull up resistor is needed,
typ 1.5kΩ.
DI Enable control for LDO6 (TX). HIGH = Enable, LOW = Disable.
A LDO6 Output (TX)
P Battery Input for LDO1 - 2
DI Enable control for LDO4 (TCXO). HIGH = Enable, LOW = Disable.
G Analog Ground pin
DI Enable control for LDO5 (RX). HIGH = Enable, LOW = Disable.
A LDO5 Output (RX)
A LDO1 Output (CORE)
A LDO2 Output (DIGI)
A LDO3 Output (ANA)
A LDO4 Output (TCXO)
P Battery Input for LDO3 - 7
A: Analog. D: Digital. I: Input. DI/O: Digital Input/Output.
G: Ground. O: Output.
P: Power.
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