LM48823 Datasheet, PDF (1/20 Pages) National Semiconductor (TI) – Mono, Bridge-Tied Load, Ceramic Speaker Driver with I2C Volume Control and Reset

LM48823
October 8, 2010
Mono, Bridge-Tied Load, Ceramic Speaker Driver with I²C
Volume Control and Reset
General Description
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_RMS from a single 4.2V supply.
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.
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).
Key Specifications
■ Output Voltage at V_DD = 4.2V,
R_L = 2.2µF + 15Ω THD+N ≤ 1%
■ Quiescent Power Supply Current
at 4.2V
■ PSRR at 217Hz
■ Shutdown current
5.4V_RMS (typ)
3.3mA (typ)
93dB (typ)
0.01μA (typ)
Features
■ ^{Integrated Charge Pump}
■ ^{Bridge-tied Load Output}
■ ^{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 µSMD package}
Applications
■ ^{Cell phones}
■ ^{Smart phones}
■ ^{Portable media devices}
■ ^{Notebook PCs}
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