LM4962 Datasheet, PDF (1/22 Pages) National Semiconductor (TI) – Ceramic Speaker Driver

January 2006
LM4962
Ceramic Speaker Driver
General Description
The LM4962 is an audio power amplifier primarily designed
for driving Ceramic Speaker for applications in Cell Phones,
Smart Phones, PDA’s and other portable applications. It is
capable of driving 15Vpp (typ) BTL with less than 1%
THD+N from a 3.2V_DC power supply. The LM4962 features
and low power consumption shutdown mode, an internal
thermal shutdown protection mechanism, along with over
current protection (OCP) and over voltage protection (OVP).
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal number of
external components. The LM4962 does not require boot-
strap capacitors, or snubber circuits.
The LM4962 also features a Band-Switch function which
allows the user to use one amplifier device for both receiver
(earpiece) mode and ringer/loudspeaker mode.
The LM4962 contains advanced pop & click circuitry that
eliminates noises which would otherwise occur during
turn-on and turn-off transitions. Additionally, the internal
boost converter features a soft-start function.
The LM4962 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
n Quiescent Power Supply Current (Boost Converter +
Amplifier)
9mA (typ)
n Voltage Swing in BTL at 1% THD, f=1KHz 15Vp-p (typ)
n Shutdown current
n OVP
0.1µA (typ)
8.5V < V_AMP < 9.5V
Features
n Pop & click circuitry eliminates noise during turn-on and
turn-off transitions
n Low current shutdown mode
n Low quiescent current
n Mono 15Vp-p BTL output, R_L = 2µF+9.4Ω, f = 1kHz, 1%
THD+N
n Over-current protection
n Over-Voltage Protection
n Unity-gain stable
n External gain configuration capability
n Including Band switch function
n Leakage cut switch (SW-LEAK)
n Soft-Start function
n Space-saving micro SMD package (2mm x 2.5mm)
Applications
n Smart phones
n Mobile Phones and Multimedia Terminals
n PDA’s, Internet Appliances, and Portable Gaming
n Portable DVD
n Digital still cameras/camcorders
Boomer^® is a registered trademark of National Semiconductor Corporation.
© 2006 National Semiconductor Corporation DS201422
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