LM4961_14 Datasheet, PDF (1/23 Pages) Texas Instruments – Ceramic Speaker Driver

LM4961, LM4961LQBD
www.ti.com
SNAS242J – AUGUST 2004 – REVISED MARCH 2007
LM4961
Ceramic Speaker Driver
Check for Samples: LM4961, LM4961LQBD
FEATURES
1
•2 Click and Pop Circuitry Eliminates Noise
During Turn-On and Turn-Off Transitions
• Low Current Shutdown Mode
• Low Quiescent Current
• Mono 15Vp-p BTL Output, R_L = 2μF+30Ω, f =
1kHz
• Thermal Shutdown Protection
• Unity-Gain Stable
• External Gain Configuration Capability
• Including Band Exchange SW
• Including Leakage Cut SW
APPLICATIONS
• Cellphone
• PDA
KEY SPECIFICATIONS
• Quiescent Power Supply Current: 7mA (typ)
• Voltage Swing in BTL at 1% THD: 15Vp-p (typ)
• Shutdown current: 0.1μA (typ)
DESCRIPTION
The LM4961 is an audio power amplifier primarily
designed for driving Ceramic Speaker for applications
in Cell Phone and PDAs. It integrates a boost
converter, with variable output voltage, with an audio
power amplifier. It is capable of driving 15V_p-p in BTL
mode to 2uF+ 30 ohms load, continuous average
power, with less than 1% distortion (THD+N) from a
3.2V_DC power supply.
Boomer audio power amplifiers were designed
specifically to provide high quality output power with a
minimal number of external components. The
LM4961 does not require bootstrap capacitors, or
snubber circuits therefore it is ideally suited for
portable applications requiring high voltage output to
drive capacitive loads like Ceramic Speakers. The
LM4961 features a low-power consumption shutdown
mode. Additionally, the LM4961 features an internal
thermal shutdown protection mechanism.
The LM4961 contains advanced pop & click circuitry
that eliminates noises which would otherwise occur
during turn-on and turn-off transitions.
The LM4961 is unity-gain stable and can be
configured by external gain-setting resistors.
Connection Diagram
SW-OUT
Bypass
Shutdown 2
V_DD
NC
Shutdown 1
GND
28 27 26 25 24 23 22
1
21
2
20
3
19
4
18
5
17
6
16
7
15
8 9 10 11 12 13 14
BW2
BW1
Band-SW
V_IN
CCHG
NC
NC
Figure 1. LM4961LQ (5x5) (Top View)
See Package Number NJB0028A
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004–2007, Texas Instruments Incorporated