LM4991

更新时间： 2024-09-20 23:16:47

品牌	Logo	应用领域
美国国家半导体 - NSC		放大器功率放大器
页数	文件大小	规格书
15页	540K
描述
3W Audio Power Amplifier with Shutdown Mode

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LM4991 数据手册

May 2003

LM4991

3W Audio Power Amplifier with Shutdown Mode

General Description

Key Specifications

n Improved PSRR at 217kHz and 1kHz

n P_Oat V_DD= 5.0V, 10% THD, 1kHz

64dB (typ)

The LM4991 is a mono bridged audio power amplifier ca-

pable of delivering 3W of continuous average power into a

3Ω load with less than 10% THD when powered by a 5V

power supply (Note 1). To conserve power in portable appli-

LM4991LD (only), 3Ω, 4Ω

All packages, 8Ω load

3W (typ), 2.5W (typ)

1.5W (typ)

cations, the LM4991’s micropower shutdown mode (I_SD

0.1µA, typ) is activated when V_DDis applied to the SHUT-

DOWN pin.

n Shutdown current

0.1µA (typ)

Features

Boomer audio power amplifiers are designed specifically to

provide high power, high fidelity audio output. They require

few external components and operate on low supply volt-

ages from 2.2V to 5.5V. Since the LM4991 does not require

output coupling capacitors, bootstrap capacitors, or snubber

networks, it is ideally suited for low-power portable systems

that require minimum volume and weight.

n Available in space-saving LLP and MA packages

n Ultra low current shutdown mode

n Can drive capacitive loads up to 500pF

n Improved pop & click circuitry reduces noises during

turn-on and turn-off transitions

n 2.2 - 5.5V operation

Additional LM4991 features include thermal shutdown pro-

tection, unity-gain stability, and external gain set.

Note 1: An LM4991LD that has been properly mounted to a circuit board will

deliver 3W into 3Ω (at 10% THD). The other package options for the LM4991

will deliver 1.5W into 8Ω (at 10% THD). See the Application Information

sections for further information concerning the LM4991LD and LM4991M.

n No output coupling capacitors, snubber networks,

bootstrap capacitors or gain-setting resistors required

n Unity-gain stable

Applications

n Wireless and cellular handsets

n PDA’s

n Portable computers

n Desktop computers

Connection Diagrams

Small Outline Package

LLP Package

20074002

Top View

Order Number LM4991MA

See NS Package Number M08A

20074039

Top View

Order Number LM4991LD

See NS Package Number LDC08A

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

DS200740

www.national.com

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与LM4991相关器件

型号	品牌	获取价格	描述	数据表
LM4991_15	TI	获取价格	3W Audio Power Amplifier with Shutdown Mode
LM4991LD	NSC	获取价格	3W Audio Power Amplifier with Shutdown Mode
LM4991LD/NOPB	TI	获取价格	3W Audio Power Amplifier with Shutdown Mode
LM4991LDX	NSC	获取价格	IC 3 W, 1 CHANNEL, AUDIO AMPLIFIER, DSO8, LLP-8, Audio/Video Amplifier
LM4991LDX/NOPB	TI	获取价格	3W Audio Power Amplifier with Shutdown Mode
LM4991MA	NSC	获取价格	3W Audio Power Amplifier with Shutdown Mode
LM4991MA/NOPB	NSC	获取价格	IC 1.5 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8, SO-8, Audio/Video Amplifier
LM4991MA/NOPB	TI	获取价格	3W Audio Power Amplifier with Shutdown Mode
LM4991MAX	NSC	获取价格	暂无描述
LM4991MAX/NOPB	TI	获取价格	3W Audio Power Amplifier with Shutdown Mode