LM48556 Datasheet, PDF (1/20 Pages) National Semiconductor (TI) – Fully Differential, Mono, Ceramic Speaker Driver

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 0.1μA.
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
V_DD = 4.5V, 1kHz
■ Power Supply Rejection Ratio
f = 217Hz, V_DD = 3.6V
■ I_DD at V_DD = 3.6V
■ Wake-Up Time
Features
■ ^{Fully differential amplifier}
■ ^{Externally configurable gain}
■ ^{Integrated charge pump}
■ ^{Low power shutdown mode}
■ ^{Soft start function}
Applications
■ ^{Mobile phones}
■ ^PDA's
■ ^{Digital cameras}
14.2V_PP (typ)
17.5V_PP (typ)
80dB (typ)
4.8mA (typ)
0.5ms (typ)
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