LM48860

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SNAS398D – JANUARY 2008 – REVISED MAY 2013

LM48860

Ground-Referenced, Ultra Low Noise, Fixed Gain

Stereo Headphone Amplifier

Check for Samples: LM48860

1

FEATURES

DESCRIPTION

The LM48860 is a ground referenced, fixed-gain

2

•

Fixed Logic Levels with Supply Voltage

audio power amplifier capable of delivering 40mW per

•

Ground Referenced Outputs

channel of continuous average power into a 16

Ω

•

High PSRR

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

3V power supply.

•

Available in Space-Saving DSBGA Package

•

Ultra Low Current Shutdown Mode

The LM48860 features a new circuit technology that

utilizes a charge pump to generate a negative

•

Improved Pop & Click Circuitry Eliminates

reference voltage. This allows the outputs to be

Noises During Turn-On and Turn-Off

biased about ground, thereby eliminating output-

Transitions

coupling capacitors typically used with normal single-

•

No Output Coupling Capacitors, Snubber

ended loads.

Networks, Bootstrap Capacitors, or Gain-

Boomer

audio

power

amplifiers

were

designed

Setting Resistors Required

specifically to provide high quality output power with a

•

Shutdown Either Channel Independently

minimal

amount

of

external

components.

The

LM48860 does not require output coupling capacitors

APPLICATIONS

or bootstrap capacitors, and therefore is ideally suited

for mobile phone and other low voltage applications

•

Mobile Phones

where minimal power consumption is a primary

•

MP3 Players

requirement.

•

PDAs

The LM48860 features a low-power consumption

•

Portable Electronic Devices

shutdown

mode

selectable

for

either

channel

separately. This is accomplished by driving either the

•

Notebook PCs

SD_RC

(Shutdown

Right

Channel)

or

SD_LC

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

KEY SPECIFICATIONS

depending on which channel is desired shutdown.

•

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

Additionally,

the

LM48860

features

an

internal

•

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

thermal shutdown protection mechanism.

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

The LM48860 contains advanced pop & click circuitry

•

Shutdown Current 0.1

μA (typ)

that eliminates noises which would otherwise occur

during turn-on and turn-off transitions.

•

Internal Fixed Gain: 1.5V/V (typ)

•

Operating Voltage: 2.0V to 5.5V

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

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.