LP3921

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SNVS580A – AUGUST 2008 – REVISED MAY 2013

LP3921 Battery Charger Management and Regulator Unit with Integrated Boomer™ Audio

Amplifier

Check for Samples: LP3921

1

FEATURES

DESCRIPTION

The LP3921 is a fully integrated charger and multi-

23

•

Charger

regulator unit with a fully differential Boomer audio

–

DC Adapter or USB Input

power amplifier designed for CDMA cellular phones.

–

Thermally Regulated Charge Current

The LP3921 has a high-speed serial interface which

allows for the integration and control of a Li-Ion

–

Under Voltage Lockout

battery charger, 7 low-noise low-dropout (LDO)

–

50 to 950 mA Programmable Charge

voltage regulators and a Boomer audio amplifier.

Current

The Li-Ion charger integrates a power FET, reverse

•

3.0V to 5.5V Input Voltage Range

current blocking diode, sense resistor with current

•

Thermal Shutdown

monitor output, and requires only a few external

•

components. Charging is thermally regulated to

obtain the most efficient charging rate for a given

Charger, LDO Outputs and Enabling Audio

ambient temperature.

Output

•

LDO's 7 Low-Noise LDO’s

LDO regulators provide high PSRR and low noise

ideally suited for supplying power to both analog and

–

2 x 300 mA

digital loads.

–

3 x 150 mA

The Boomer Audio Amplifier is capable of delivering

–

2 x 80 mA

1.1 watts of continuous average power to an 8

Ω BTL

2% (typ.) Output Voltage Accuracy on LDO's

load with less than 1% distortion (THD+N). Boomer

•

Audio

Audio Power Amplifiers were designed specifically to

–

Fully Differential Amplification

provide high quality output power with a minimal

amount of external components. The Boomer Audio

–

Ability to Drive Capacitive Loads up to 100

Amplifier does not require output coupling capacitors

pF

or bootstrap capacitors, and therefore is ideally suited

–

No Output Coupling Capacitors, Snubber

for mobile phone and other low voltage applications

Networks or Bootstrap Capacitors Required

where minimal power consumption and part count is

the primary requirement. The Boomer Audio Amplifier

•

Space-Efficient 32-pin 5 x 5 mm WQFN

contains

advanced

pop

&

click

circuitry

which

Package

eliminates

noises

during

turn-on

and

turn-off

transitions.

APPLICATIONS

•

CDMA Phone Handsets

•

Low Power Wireless Handsets

•

Handheld Information Appliances

•

Personal Media Players

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

Boomer is a trademark of Texas Instruments.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.