LM4960 Datasheet, PDF (1/12 Pages) National Semiconductor (TI) – Piezoelectric Speaker Driver

October 2004
LM4960
Piezoelectric Speaker Driver
General Description
The LM4960 utilizes a switching regulator to drive a dual
audio power amplifier. It delivers 24V_P-P mono-BTL to a
ceramic speaker with less than 1.0% THD+N while operating
on a 3.0V power supply.
The LM4960’s switching regulator is a current-mode boost
converter operating at a fixed frequency of 1.6MHz.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4960 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
The LM4960 features a low-power consumption externally
controlled micropower shutdown mode. Additionally, the
LM4960 features and internal thermal shutdown protection
mechanism along with a short circuit protection.
The LM4960 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
n V_OUT @ V_DD = 3.0 THD+N ≤ 1%
n Power supply range
n Switching Frequency
Features
n Stereo BTL amplifier
n Low current shutdown mode
n "Click and pop" suppression circuitry
n Low Quiescent current
n Unity-gain stable audio amplifiers
n External gain configuration capability
n Thermal shutdown protection circuitry
n Wide input voltage range (3.0V - 7V)
n 1.6MHz switching frequency
Applications
n Mobile phone
n PDA’s
Connection Diagram
LM4960SQ
24V_P-P (typ)
3.0 to 7V
1.6MHz (typ)
Top View
Order Number LM4960SQ
See NS Package Number
20076582
Boomer^® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS200765
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