LP3921

更新时间： 2024-11-15 05:42:31

品牌	Logo	应用领域
美国国家半导体 - NSC		电池音频放大器
页数	文件大小	规格书
34页	1306K
描述
Battery Charger Management and Regulator Unit with Integrated Boomer® Audio Amplifier

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LP3921 数据手册

August 26, 2008

LP3921

Battery Charger Management and Regulator Unit with

Integrated Boomer^®Audio Amplifier

General Description

Features

The LP3921 is a fully integrated charger and multi-regulator

unit with a fully differential Boomer audio power amplifier de-

signed for CDMA cellular phones. The LP3921 has a high-

speed serial interface which allows for the integration and

control of a Li-Ion battery charger, 7 low-noise low-dropout

(LDO) voltage regulators and a Boomer audio amplifier.

Charger

■

DC adapter or USB input

—

Thermally regulated Charge Current

Under Voltage Lockout

50 to 950 mA Programmable Charge Current

3.0V to 5.5V Input Voltage Range

■

The Li-Ion charger integrates a power FET, reverse current

blocking diode, sense resistor with current monitor output,

and requires only a few external components. Charging is

thermally regulated to obtain the most efficient charging rate

for a given ambient temperature.

Thermal shutdown

I²C-compatible Interface for controlling Charger, LDO

outputs and enabling Audio output

LDO's

7 Low-Noise LDO’s

■

LDO regulators provide high PSRR and low noise ideally suit-

ed for supplying power to both analog and digital loads.

2 x 300 mA

3 x 150 mA

2 x 80 mA

—

The Boomer Audio Amplifier is capable of delivering 1.1 watts

of continuous average power to an 8Ω BTL load with less than

1% distortion (THD+N). Boomer Audio Power Amplifiers were

designed specifically to provide high quality output power with

a minimal amount of external components. The Boomer Au-

dio Amplifier does not require output coupling capacitors or

bootstrap capacitors, and therefore is ideally suited for mobile

phone and other low voltage applications where minimal pow-

er consumption and part count is the primary requirement.

The Boomer Audio Amplifier contains advanced pop & click

circuitry which eliminates noises during turn-on and turn-off

transitions.

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

Audio

■

Fully Differential Amplification

—

Ability to drive capacitive loads up to 100 pF

No output coupling capacitors, snubber networks or

bootstrap capacitors required

Space- Efficient 32-pin 5 x 5 mm LLP package

Applications

CDMA Phone Handsets

■

Low Power Wireless Handsets

Handheld Information Appliances

Personal Media Players

Boomer^®is a registered trademark of National Semiconductor Corporation.

300698

www.national.com

12 3 4 5 6 7...34

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与LP3921相关器件

型号	品牌	获取价格	描述	数据表
LP3921SQ	NSC	获取价格	Battery Charger Management and Regulator Unit
LP3921SQ/NOPB	TI	获取价格	具有集成 Boomer 音频放大器的电池充电器管理和稳压器单元 \| RTV \| 32 \|
LP3921SQE	NSC	获取价格	Battery Charger Management and Regulator Unit
LP3921SQE/NOPB	TI	获取价格	具有集成 Boomer 音频放大器的电池充电器管理和稳压器单元 \| RTV \| 32 \|
LP3921SQX	NSC	获取价格	Battery Charger Management and Regulator Unit
LP3921SQX/NOPB	TI	获取价格	具有集成 Boomer 音频放大器的电池充电器管理和稳压器单元 \| RTV \| 32 \|
LP3923	TI	获取价格	Cellular Phone Power Management Unit
LP3923TL	TI	获取价格	Cellular Phone Power Management Unit
LP3923TL	NSC	获取价格	IC 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA30, 3 X 2.50 MM, MICRO SMD-30, Power Management
LP3923TL-VB	TI	获取价格	Cellular Phone Power Management Unit

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