LM4915LQXSLASHNOPB中文资料德州仪器数据手册PDF规格书

FEATURES

• Pseudo-Differential Amplification

• Internal Gain-Setting Resistors

• Available in Space-Saving WQFN Package

• Ultra Low Current Shutdown Mode

• Can Drive Capacitive Loads up to 500pF

• Improved Pop & Click Circuitry Virtually

Eliminates Noises During Turn-On and Turn-

Off Transitions

• 2.2 - 5.5V Operation

• No Output Coupling Capacitors, Snubber

Networks, Bootstrap Capacitors or Gain-

Setting Resistors Required

• Ultra Low Noise

KEY SPECIFICATIONS

• Improved PSRR at 217Hz and 1kHz: 75dB (Typ)

• Power Output at 5.0V & 1% THD into 32Ω:

280mW (Typ)

• Power Output at 3.0V & 1% THD into 32Ω:

90mW (Typ)

• Output Noise, A-weighted: 20μV (Typ)

APPLICATIONS

• Mobile Phones

• PDAs

• Portable Electronics Devices

DESCRIPTION

The LM4915 is a pseudo-differential audio power

amplifier primarily designed for demanding

applications in mobile phones and other portable

audio device applications with mono headphones. It

is capable of delivering 90 miliwatts of continuous

average power to a 32Ω BTL load with less than 1% distortion (THD+N) from a 3VDC power supply.

Boomer audio power amplifiers were designed

specifically to provide high quality output power with a

minimal amount of external components. The

LM4915 does not require output coupling capacitors

or bootstrap capacitors, and therefore is ideally suited

for mobile phone and other low voltage applications

where minimal power consumption is a primary

requirement.

The LM4915 features a low-power consumption

shutdown mode. To facilitate this, Shutdown may be

enabled by driving the shutdown pin low. Additionally,

the LM4915 features an internal thermal shutdown

protection mechanism.

The LM4915 contains advanced pop & click circuitry

which virtually eliminates noises which would

otherwise occur during turn-on and turn-off

transitions.

The LM4915 has an internally fixed gain of 6dB.