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10

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1

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4

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LP3947

SNVS298B – NOVEMBER 2004 – REVISED APRIL 2013

www.ti.com

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

CONNECTION DIAGRAMS AND PACKAGE MARK INFORMATION

Figure 1. Package Number NHL0014B (Top View)

PIN DESCRIPTIONS

Pin #

Name

Description

1

EN

Charger Enable Input. Internally pulled high to CHG-IN pin. A HIGH enables the charger and a LOW disables the

charger.

2

SCL

I2C serial Interface Clock input.

3

SDA

I2C serial Interface Data input/out.

4

BATT

Battery supply input terminal. Must have 10 µF ceramic capacitor to GND

5

VT

Regulated 2.78V output used for biasing the battery temperature monitoring thermistor.

6

VBSENSE

Battery Voltage Sense connected to the positive terminal of the battery.

7

MODE

Select pin between AC adaptor and USB port. A LOW sets the LP3947 in USB port and a HIGH sets it in the AC

adaptor.

8

Diff-Amp

Charge current monitoring differential amplifier output. Voltage output representation of the charge current.

9

Ts

Multi function pin. Battery temperature monitoring input and LDO/Charger mode.

Pulling this pin to VT, or removing the thermistor by physically disconnecting the battery, sets the device in LDO

mode.

10

EOC

Active Low Open Drain Output. Active when USB port or AC adaptor is connected and battery is fully charged. For

more information, refer to “LED Charge Status Indicators” section.

11

GND

Ground

12

CHG

Active Low Open Drain Output. Active when USB port or AC adaptor is connected and battery is being charged.

For more information, refer to “LED Charge Status Indicators” section.

13

ISEL

Control pin to switch between low power (100 mA) mode and high power (500 mA) mode in USB mode. This pin

is pulled high internally as default to set the USB in 100 mA mode. This pin has to be externally pulled low to go

into 500 mA mode.

14

CHG-IN

Charger input from a regulated, current limited power source. Must have a 1 µF ceramic capacitor to GND

Table 1. ORDERING INFORMATION

Part Number

Default Options

Top-Side Markings

LP3947ISD-09

ICHG = 500 mA

L00061B

VBATT = 4.1V

EOC = 0.1C

LP3947ISD-51

ICHG = 500 mA

L00062B

VBATT = 4.2V

EOC = 0.1C

2

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