LM48556TLX datasheet(1/20 Pages) NSC

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December 10, 2008

LM48556

Fully Differential, Mono, Ceramic Speaker Driver

General Description

The LM48556 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 LM48556 charge pump allows the device to deliver

17.5V

PP (typ) from a single 4.5V supply. Additionally, the

charge pump features a soft start function that minimizes

transient current during power-up.

The LM48556 features high power supply rejection ratio

(PSRR) of 80dB at 217Hz, allowing the device to operate in

noisy environments without additional power supply condi-

tioning. Flexible power supply requirements allow operation

from 2.7V to 5.0V. Additionally, the LM48556 features a dif-

ferential input function and an externally configurable gain. A

low power shutdown mode reduces supply current consump-

tion to 0.1

μA.

Superior click and pop suppression eliminates audible tran-

sients on power-up/down and during shutdown. The

LM48556 is available in an ultra-small 12-bump micro SMD

package (2mm x 1.5mm).

Key Specifications

■ Output Voltage Swing

V

DD = 3.6V, 1kHz

14.2V

PP (typ)

V

DD = 4.5V, 1kHz

17.5V

PP (typ)

■ Power Supply Rejection Ratio

f = 217Hz, V

DD = 3.6V

80dB (typ)

■ I

DD at VDD = 3.6V

4.8mA (typ)

■ Wake-Up Time

0.5ms (typ)

Features

■ Fully differential amplifier

■ Externally configurable gain

■ Integrated charge pump

■ Low power shutdown mode

■ Soft start function

Applications

■ Mobile phones

■ PDA's

■ Digital cameras

Boomer® is a registered trademark of National Semiconductor Corporation.

300572

www.national.com

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Texas Instruments	LM48556TLX/NOPB	1Mb / 22P	[Old version datasheet] Fully Differential, Mono, Ceramic Speaker Driver

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