SNAS486D – JULY 2009 – REVISED MAY 2013
LM48557 Boomer™ Mono, Bridge-Tied Load, Ceramic Speaker Driver with I2C Volume
Control and Reset
Check for Samples: LM48557
•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
• Mobile Phones
• Notebook Electronic Devices
• MP3 Players
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
• Output Voltage at VDD = 4.2V
– RL = 1µF +22Ω, THD+N ≤ 1%: 5.8 VRMS (Typ)
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Boomer is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009–2013, Texas Instruments Incorporated