1FEATURES

2• Available in Space Saving 0.4mm Pitch

DSBGA Package

• Fixed Logic Levels

• Ground Referenced Outputs

• High PSRR

• Ultra Low Current Shutdown Mode

• Improved Pop and Click Circuitry Eliminates

Noises During Turn-On and Turn-Off outputTransitions

• No Output Coupling Capacitors, Snubber

Networks, Bootstrap Capacitors, or Gain-

Setting Resistors Required

• Shutdown Either Channel Independently

• Soft Start Feature Reduces Start up Transient

Current

APPLICATIONS

• Mobile Phones

• MP3 Players

• PDAs

• Portable electronic devices

• Notebook PCs

KEY SPECIFICATIONS

• Improved PSRR at 217Hz: 80dB (typ)

• Power Output at VDD = 3V, RL = 16Ω, THD+N =

1%: 95mW (typ)

• Shutdown Current: 0.05μA (typ)

• Internal Fixed Gain: 1.5V/V (typ)

• Wide Operating Voltage Range: 1.6V to 4.5V

DESCRIPTION

The LM48820 is a ground referenced, fixed-gain

audio power amplifier capable of delivering 95mW of

continuous average power into a 16Ω single-ended

load, with less than 1% THD+N from a 3V power

supply.

The LM48820 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 outputTransitions

coupling capacitors typically used with normal single- ended loads.

Boomer audio power amplifiers were designed

specifically to provide high quality output power with a minimal number of external components. The

LM48820 does not require output coupling capacitors

or bootstrap capacitors, and therefore is ideally suited

for mobile phone and other portable applications.

The LM48820 features a low-power consumption

shutdown mode selectable for each channel and a

soft start function that reduces start-up current

transients. Additionally, the LM48820 features an

internal thermal shutdown protection mechanism.

The LM48820 contains advanced pop and click

circuitry that eliminates noises which would otherwise

occur during turn-on and turn-off transitions.

The LM48820 has an internal fixed gain of 1.5V/V.