LM48823

更新时间： 2024-11-21 05:42:23

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器
页数	文件大小	规格书
20页	494K
描述
Mono, Bridge-Tied Load, Ceramic Speaker Driver with I2C Volume Control and Reset

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LM48823 数据手册

October 8, 2010

LM48823

Mono, Bridge-Tied Load, Ceramic Speaker Driver with I²C

Volume Control and Reset

General Description

Key Specifications

The LM48823 is a single supply, mono, ceramic speaker driv-

er with an integrated charge-pump, designed for portable

devices, such as cell phones, where board space is at a pre-

mium. The LM48823 charge pump allows the device to deliver

5.4V_RMSfrom a single 4.2V supply.

■ꢀOutput Voltage at V_DD= 4.2V,

R_L= 2.2µF + 15Ω THD+N ≤ 1%

5.4V_RMS(typ)

■ꢀQuiescent Power Supply Current

at 4.2V

3.3mA (typ)

93dB (typ)

The LM48823 features high power supply rejection ratio

(PSRR), 93dB at 217Hz, allowing the device to operate in

noisy environments without additional power supply condi-

tioning. Flexible power supply requirements allow operation

from 2.0V to 4.5V. The LM48823 features an active low reset

input that reverts the device to its default state. Additionally,

the LM48823 features a 32-step I²C volume control. The low

power Shutdown mode reduces supply current consumption

to 0.01µA.

■ꢀPSRR at 217Hz

■ꢀShutdown current

0.01μA (typ)

Features

Integrated Charge Pump

■

Bridge-tied Load Output

High PSRR

I²C Volume and Mode Control

The LM48823’s superior click and pop suppression elimi-

nates audible transients on power-up/down and during shut-

down. The LM48823 is available in an ultra-small 16-bump

micro SMD package (2mmx2mm).

Reset Input

Advanced Click-and-Pop Suppression

Low Supply Current

Minimum external components

Micro-power shutdown

■

Available in space-saving 16-bump µSMD package

Applications

Cell phones

■

Smart phones

Portable media devices

Notebook PCs

Boomer® is a registered trademark of National Semiconductor Corporation.

Tru-GND is a trademark of National Semiconductor Corporation.

300684

www.national.com

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