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LM4925SD
2 Cell, Single Ended Output, 40mW Stereo Headphone Audio Amplifier
LM4925 Cell, Single Ended Output, 40mW Stereo Headphone
Audio Amplifier
General DescriptionThe unity gain stable LM4925is botha mono differential
output (for BTL operation) audio amplifier anda Single
Ended (SE) stereo headphone amplifier. Operatingona
single3V supply, the mono-BTL mode delivers 410mW into 8Ω loadat 1% THD+N.In Single Ended stereo head-
phone mode,the amplifier delivers 40mWper channel intoa
16Ω loadat 1% THD+N.
Withthe LM4925 packagedin the MM and LLP packages,
the customer benefits include low profile and small size. This
package minimizes PCB area and maximizes output power.
The LM4925 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= 3.0V, THD+N= 1%) 410mW (typ) Single Ended Output Power Per Channel (RL =16Ω,VDD= 3.0V, THD+N= 1%) 40mW (typ) Micropower shutdown current 0.1µA (typ) Supply voltage operating range 1.5V< VDD< 3.6V PSRR 100Hz, VDD= 3V, BTL 70dB (typ)
Features BTL modefor mono speaker 2-cell 1.5Vto 3.6V battery operation Single ended headphone operation with output coupling
capacitors Unity-gain stable “Click and pop” suppression circuitryfor both Shutdown
and Mute Active low micro-power shutdown Active-low mute mode Thermal shutdown protection circuitry
Applications Portable two-cell audio products Portable two-cell electronic devices
Typical ApplicationFIGURE1. Block Diagram
February 2005
LM4925
Cell,
Single
Ended
Output,
40mW
Stereo
Headphone
Audio
Amplifier
