Charger

control

TS

CHG-IN

EN

SCL

SDA

Mode

+

-

RSENSE

Vref

+

-

-

+

+

-

ISEL

CHG

BATT

Diff Amp

VT

EOC

I

2

C and Digital

ON/OFF

Control

LED

Driver

Power

FET

Control

LDO

Mode

UTLO

OTLO

LDO

Error

Amp

LP3947

www.ti.com

SNVS298B – NOVEMBER 2004 – REVISED APRIL 2013

LP3947 FUNCTIONAL BLOCK DIAGRAM

ABSOLUTE MAXIMUM RATINGS

(1) (2)

If Military/Aerospace specified devices are required, contact the Texas Instruments Semiconductor Sales Office/

Distributors for availability and specifications.

CHG-IN

−0.3V to +6.5V

All pins except GND and CHG-IN (3)

−0.3V to +6V

Junction Temperature

150°C

Storage Temperature

−40°C to +150°C

Power Dissipation (4)

1.89W

ESD (5)

Human Body Model

2 kV

Machine Model

200V

(1)

All voltages are with respect to the potential at the GND pin.

(2)

Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which

operation of the device is ensured. Operating Ratings do not imply verified performance limits. For specified performance limits and

associated test conditions, see the Electrical Characteristics tables.

(3)

Caution must be taken to avoid raising pins EN and VT 0.3V higher than VCHG-IN and raising pins ISEL, MODE, SCL and SDA 0.3V

higher than VBATT.

(4)

The Absolute Maximum power dissipation depends on the ambient temperature and can be calculated using the formula

MM P = (TJ – TA)θJA,

where TJ is the junction temperature, TA is the ambient temperature, and θJA is the junction-to-ambient thermal resistance. The 1.89W

rating appearing under Absolute Maximum Ratings results from substituting the Absolute Maximum junction temperature, 150°C, for TJ,

80°C for TA, and 37°C/W for θJA. More power can be dissipated safely at ambient temperatures below 80°C. Less power can be

dissipated safely at ambient temperatures above 80°C. The Absolute Maximum power dissipation can be increased by 27 mW for each

degree below 80°C, and it must be de-rated by 27 mW for each degree above 80°C.

(5)

The human-body model is used. The human-body model is 100 pF discharged through 1.5 k

Ω.

Copyright © 2004–2013, Texas Instruments Incorporated

Submit Documentation Feedback

3

Product Folder Links: LP3947