1FEATURES

2• Fixed Logic Levels with Supply Voltage

• Ground Referenced Outputs

• High PSRR

• Available in Space-Saving DSBGA Package

• Ultra Low Current Shutdown Mode

• Improved Pop & Click Circuitry Eliminates

Noises During Turn-On and Turn-Off

Transitions

• No Output Coupling Capacitors, Snubber

Networks, Bootstrap Capacitors, or Gain-

Setting Resistors Required

• Shutdown Either Channel Independently

APPLICATIONS

• Mobile Phones

• MP3 Players

• PDAs

• Portable Electronic Devices

• Notebook PCs

KEY SPECIFICATIONS

• PSRR at 217Hz (VDD = 3.0V): 80dB (typ)

• Stereo Power Output at VDD = 3V, RL = 16Ω,

THD+N = 1%: 40mW (typ)

• Shutdown Current 0.1μA (typ)

• Internal Fixed Gain: 1.5V/V (typ)

• Operating Voltage: 2.0V to 5.5V

DESCRIPTION

The LM48860 is a ground referenced, fixed-gain

audio power amplifier capable of delivering 40mW per

channel of continuous average power into a 16Ω

single-ended load with less than 1% THD+N from a

3V power supply.

The LM48860 features a new circuit technology that

utilizes a charge pump to generate a negative

reference voltage. This allows the outputs to be

biased about ground, thereby eliminating outputcoupling

capacitors typically used with normal single-

ended loads.

Boomer audio power amplifiers were designed

specifically to provide high quality output power with a

minimal amount of external components. The

LM48860 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 LM48860 features a low-power consumption

shutdown mode selectable for either channel

separately. This is accomplished by driving either the

SD_RC (Shutdown Right Channel) or SD_LC

(Shutdown Left Channel) (or both) pins with logic low,

depending on which channel is desired shutdown.

Additionally, the LM48860 features an internal

thermal shutdown protection mechanism.

The LM48860 contains advanced pop & click circuitry

that eliminates noises which would otherwise occur

during turn-on and turn-off transitions.

The LM48860 has an internal fixed gain of 1.5V/V.