1FEATURES

23• Integrated Charge Pump

• Bridge-Tied Load Output

• Differential Input

• High PSRR

• I2C Volume and Mode Control

• Reset Input

• Advanced Click-and-Pop Suppression

• Low Supply Current

• Minimum External Components

• Micro-Power Shutdown

• Available in Space-Saving 16-Bump DSBGA

Package

APPLICATIONS

• Mobile Phones

• PDAs

• Notebook Electronic Devices

• MP3 Players

KEY APPLICATIONS

• Output Voltage at VDD = 4.2V

– RL = 1μF +22Ω, THD+N ≤ 1%: 5.8 VRMS (Typ)

DESCRIPTION

The LM48557 is a single supply, mono, ceramic

speaker driver with an integrated charge-pump,

designed for portable devices, such as cell phones

and portable media players, where board space is at

a premium. The LM48557 charge pump allows the

device to deliver 5.8VRMS from a single 4.2V supply.

The LM48557 features high power supply rejection

ratio (PSRR), 80dB at 217Hz, allowing the device to

operate in noisy environments without additional

power supply conditioning. Flexible power supply

requirements allow operation from 2.7V to 4.5V. The

LM48557 features an active low reset input that reverts the device to its default state. Additionally, the

LM48557 features a 36-step I2C volume control and

mute function. The low power Shutdown mode

reduces supply current consumption to 0.01μA.

The LM48557’s superior click and pop suppression

eliminates audible transients on power-up/down and

during shutdown. The LM48557 is available in an

ultra-small 16-bump DSBGA package (1.965mm x

1.965mm).