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9 10 11 12 13 14

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SW-OUT

Bypass

Shutdown 2

NC

Shutdown 1

GND

BW2

BW1

Band-SW

CCHG

NC

NC

LM4961, LM4961LQBD

www.ti.com

SNAS242K – AUGUST 2004 – REVISED MAY 2013

LM4961

Ceramic Speaker Driver

Check for Samples: LM4961, LM4961LQBD

1

FEATURES

DESCRIPTION

The LM4961 is an audio power amplifier primarily

2

•

Click and Pop Circuitry Eliminates Noise

designed for driving Ceramic Speaker for applications

During Turn-On and Turn-Off Transitions

in Cell Phone and PDAs. It integrates a boost

•

Low Current Shutdown Mode

converter, with variable output voltage, with an audio

•

Low Quiescent Current

mode to 2uF+ 30 ohms load, continuous average

•

power, with less than 1% distortion (THD+N) from a

1kHz

•

Thermal Shutdown Protection

Boomer

audio

power

amplifiers

were

designed

•

Unity-Gain Stable

specifically to provide high quality output power with a

•

External Gain Configuration Capability

minimal

number

of

external

components.

The

LM4961 does not require bootstrap capacitors, or

•

Including Band Exchange SW

snubber circuits therefore it is ideally suited for

•

Including Leakage Cut SW

portable applications requiring high voltage output to

drive capacitive loads like Ceramic Speakers. The

APPLICATIONS

LM4961 features a low-power consumption shutdown

mode. Additionally, the LM4961 features an internal

•

Cellphone

thermal shutdown protection mechanism.

•

PDA

The LM4961 contains advanced pop & click circuitry

KEY SPECIFICATIONS

that eliminates noises which would otherwise occur

during turn-on and turn-off transitions.

•

Quiescent Power Supply Current: 7mA (typ)

The

LM4961

is

unity-gain

stable

and

can

be

•

Voltage Swing in BTL at 1% THD: 15Vp-p (typ)

configured by external gain-setting resistors.

•

Shutdown current: 0.1

μA (typ)

Connection Diagram

Figure 1. LM4961LQ (5x5) (Top View)

See Package Number NJB0028A

1

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.