LP3918

1 PF

1 PF

1 PF

10 PF

1 PF

1 PF

1 PF

1 PF

10 PF

10 PF

1.5 k:

1.5 k:

VSS

SDA

PS_HOLD

PWR_ON

RESET_N

SCL

LDO2

LDO4

RX_EN

GNDA

LDO3

LDO2

LDO1

ACOK_N PON_N

LDO7

LDO6

VIN2

TX_EN

LDO5

IMON

CHGIN

BATT

VIN1

HF_PWR

TCXO_EN

A5

B4

C4

B5

C5

D5

E5

A4

B2

C3

A3

B3

A1

A2

B1

C1

C2

D1

D2

E1

E2

D3

E3

E4

D4

LP3918

www.ti.com

SNVS476D – AUGUST 2007 – REVISED MAY 2013

PIN DESCRIPTION (continued)

Pin #

Name

Description

E1

LDO1

A

LDO1 Output (CORE)

E2

LDO2

A

LDO2 Output (DIGI)

E3

LDO3

A

LDO3 Output (ANA)

E4

LDO4

A

LDO4 Output (TCXO)

E5

VIN2

P

Battery Input for LDO3 - 7

Applications Schematic Diagram

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

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