LM4954TLSLASHNOPB中文资料德州仪器数据手册PDF规格书

1FEATURES

23• No Output Coupling Capacitors, Snubber

Networks or Bootstrap Capacitors Required

• Unity Gain Stable

• Externally Configurable Gain

• Ultra Low Current Active Low Shutdown Mode

• BTL Output can Drive Capacitive Loads Up to

100pF

• “Click and Pop” Suppression Circuitry

• 2.7V - 9.0V Operation

• Available in Space-Saving DSBGA Package

APPLICATIONS

• Mobile Phones

• PDAs

KEY SPECIFICATIONS

• Wide Power Supply Voltage Range, 2.7 ≤ VDD ≤

9V

• Output Power: VDD = 7V, 1% THD+N, 2.4W

(Typ)

• Quiescent Power Supply Current, 3mA (Typ)

• PSRR: VDD = 5V and 3V at 217Hz, 80dB (Typ)

• Shutdown Power Supply Current, 0.01μA (Typ)

DESCRIPTION

The LM4954 is an audio power amplifier primarily

designed for demanding applications in mobile

phones and other portable communication device

applications. It is capable of delivering 2.4 Watts of

continuous average power to an 8Ω BTL load with

less than 1% THD+N from a 7VDC power supply.

Boomer audio power amplifiers are designed

specifically to provide high quality output power with a

minimal number of external components. The

LM4954 does not require output coupling capacitors

or bootstrap capacitors, and therefore is ideally suited

for lower-power portable applications where minimal

space and power consumption are primary

requirements.

The LM4954 features a low-power consumption

global shutdown mode which is achieved by driving the shutdown pin with logic low. Additionally, the

LM4954 features an internal thermal shutdown

protection mechanism.

The LM4954 contains advanced pop & click circuitry

which eliminates noises that would otherwise occur

during turn-on and turn-off transitions.

The LM4954 is unity-gain stable and can be

configured by external gain-setting resistors.