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LM4919MMXNSN/a4902avai1.5V, Mono 85mW BTL Output, 14mW Stereo Headphone Audio Amplifier


LM4919MMX ,1.5V, Mono 85mW BTL Output, 14mW Stereo Headphone Audio AmplifierGeneral Description Key Specificationsn Mono-BTL output powerThe unity gain stable LM4919 is both a ..
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LM4919MMX
1.5V, Mono 85mW BTL Output, 14mW Stereo Headphone Audio Amplifier
LM4919
1.5V, Mono 85mW BTL Output, 14mW Stereo Headphone
Audio Amplifier
General Description

The unity gain stable LM4919is botha mono-BTL audio
power amplifier anda Single Ended (SE) stereo headphone
amplifier. Operatingona single 1.5V supply, the mono BTL
mode delivers 85mW intoan 8Ω loadat 1% THD+N.In
Single Ended stereo headphone mode,the amplifier delivers
14mW per channel intoa 16Ω loadat 1% THD+N.
With the LM4919 packagedin the MM package, the cus-
tomer benefits include low profile and small size. This pack-
age minimizes PCB area and maximizes output power.
The LM4919 features circuitry that reduces output transients
("clicks" and "pops") during device turn-on and turn-off,an
externally controlled, low-power consumption, active-low
shutdown mode, and thermal shutdown. Boomer audio
power amplifiers are designed specificallyto use few exter-
nal components and provide high quality output powerina
surface mount package.
Key Specifications
Mono-BTL output power (RL =8Ω,VDD= 1.5V, THD+N= 1%) 85mW (typ) Stereo Headphone output power (RL =16Ω,VDD= 1.5V, THD+N= 1%) 14mW (typ) Micropower shutdown current 0.02µA (typ) Supply voltage operating range 0.9V< VDD< 2.5V PSRR 1kHz, VDD= 1.5V,RL =16Ω 72dB (typ)
Features
Single-cell 0.9Vto 2.5V battery operation BTL modefor mono speaker Single ended headphone operation with coupling
capacitors Unity-gain stable "Click and pop" suppression circuitry Active low micropower shutdown Low current, active-low mute mode Thermal shutdown protection circuitry
Applications
Portable one-cell audio products Portable one-cell electronic devices
Typical Application

FIGURE1. Block Diagram
May 2004
LM4919
1.5V
Mono
85mW
BTL
Output,
14mW
Stereo
Headphone
Audio
Amplifier
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