LP3918 Datasheet, PDF (3/39 Pages) National Semiconductor (TI) – Battery Charge Management and Regulator Unit

LP3918
www.ti.com
Pin #
E1
E2
E3
E4
E5
Name
LDO1
LDO2
LDO3
LDO4
VIN2
SNVS476D – AUGUST 2007 – REVISED MAY 2013
PIN DESCRIPTION (continued)
Type ⁽¹⁾
Description
A
LDO1 Output (CORE)
A
LDO2 Output (DIGI)
A
LDO3 Output (ANA)
A
LDO4 Output (TCXO)
P
Battery Input for LDO3 - 7
Applications Schematic Diagram
LDO2
ACOK_N PON_N LDO7 TX_EN LDO6 LDO5 VIN2 ^VBATT
1.5 k: 1.5 k:
1 PF
1 PF 1 PF
10 PF
A5
B4
B5
C4
C5
D5
E5
RESET_N
A4
D4
SDA
C3
V_BATT
B2
PWR_ON
SCL
B3
LP3918
E4
1 PF
D3
1 PF
E3
VSS
PS_HOLD
A3
A2
A1
B1
10 PF
C1
C2
V_BATT
E2
1 PF
E1
D1
D2
1 PF
10 PF
RX_EN
LDO4
GNDA
LDO3
LDO2
LDO1
IMON CHGIN BATT HF_PWR VIN1 TCXO_EN
Figure 3. Applications Schematic
Device Description
The LP3918 Charge Management and Regulator Unit is designed to supply charger and voltage output
capabilities for mobile systems, e.g. CDMA handsets. The device provides a Li-Ion charging function and 7
regulated outputs. Communication with the device is via an I2C compatible serial interface that allows function
control and status read-back.
The battery charge management section provides a programmable CC/CV linear charge capability. Following a
normal charge cycle a maintenance mode keeps battery voltage between programmable levels. Power levels are
thermally regulated to obtain optimum charge levels over the ambient temperature range.
Charger Features
• Pre-charge, CC, CV and Maintenance modes
• USB Charge 100mA/450mA
• Integrated FET
• Integrated Reverse Current Blocking Diode
• Integrated Sense Resistor
Copyright © 2007–2013, Texas Instruments Incorporated
Product Folder Links: LP3918
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