LM4870 판매점 - 1.1W Audio Power Amplifier with Shutdown Mode

LM4870 반도체 회로 부품 판매점

1.1W Audio Power Amplifier with Shutdown Mode

National Semiconductor

October 1997

LM4870

1.1W Audio Power Amplifier with Shutdown Mode

General Description

The LM4870 is a bridge-connected audio power amplifier ca-

pable of delivering 1.1W of continuous average power to an

8Ω load with less than 0.5% THD+N over the audio spectrum

from a 5V power supply.

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal number of

external components. Since the LM4870 does not require

output coupling capacitors, bootstrap capacitors or snubber

networks, it is optimally suited for low-power portable sys-

tems.

The LM4870 features an externally controlled, low-power

consumption shutdown mode, as well as an internal thermal

shutdown protection mechanism. It also includes two head-

phone control inputs and a headphone sense output for ex-

ternal monitoring. The LM4870 is unity-gain stable and the

gain is set using external resistors.

Key Specifications

n THD+N at 1W into 8Ω

n Output power into 8Ω at 1kHz

at 10%THD+N

n Shutdown Current

0.5% (max)

1.5W (typ)

0.6µA (typ)

Features

n No output coupling capacitors, bootstrap capacitors, or

snubber circuits are necessary

n Small Outline (SOIC) power packaging

n Unity-gain stable

n External gain configuration capability

Applications

n Personal computers

n Desktop computers

n Low voltage audio system

Typical Application

Connection Diagram

Small Outline Package

DS100094-2

Top View

Order Number LM4870M

See NS Package Number M16A

DS100094-1

FIGURE 1. Typical Audio Amplifier Application Circuit

Boomer® is a registered trademark of National Semiconductor Corporation.

www.national.com

Absolute Maximum Ratings (Note 2)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Supply Voltage

Storage Temperature

Input Voltage

Power Dissipation

ESD Susceptibility (Note 4)

ESD Susceptibility (Note 5)

Junction Temperature

Soldering Information

Small Outline Package

Vapor Phase (60 sec.)

6.0V

−65˚C to +150˚C

−0.3V to VDD + 0.3V

Internally limited

3000V

250V

150˚C

215˚C

Infrared (15 sec.)

220˚C

Thermal Resistance

φJC(typ)

35˚C/W

φJA(typ)

100˚C/W

See AN-450 “Surface Mounting and their Effects on Product

Reliability” for other methods of soldering surface mount de-

vices.

Operating Ratings

Temperature Range

TMIN ≤ TA ≤ TMAX

Supply Voltage

−20˚C ≤ TA ≤ +85˚C

2.0V ≤ VDD ≤ 5.5V

Electrical Characteristics

(Notes 1, 2) The following specifications apply for VDD = 5V, RL = 8Ω unless otherwise specified. Limits apply for TA = 25˚C.

Symbol

Parameter

Conditions

LM4870

Typical

Limit

Units

(Limits)

(Note 6) (Note 7)

VDD Supply Voltage

2.0 V (min)

5.5 V (max)

IDD

ISD

VOS

THD+N

PSRR

Vod

VIH

VIL

VOH

VOL

Quiescent Power Supply Current

Shutdown Current

Output Offset Voltage

Output Power

Total Harmonic Distortion + Noise

Power Supply Rejection Ratio

Output Dropout Voltage

HP-IN High Input Voltage

HP-IN Low Input Voltage

HP-SENSE High Output Voltage

HP-SENSE Low Output Voltage

VO = 0V, IO = 0A

Vpin2 = VDD

VIN = 0V

THD+N = 0.5% (max); f = 1 kHz

PO = 1 Wrms; 20 Hz ≤ f ≤ 20 kHz

VDD = 4.9V to 5.1V

VIN = 0V to 5V

HP-SENSE = 0V to 4V

HP-SENSE = 4V to 0V

IO = 500 µA

IO = −500 µA

7.0

0.4

1.1

0.25

0.6

2.5

2.8

0.2

15.0

mA (max)

µA

50.0

mV (max)

1.0 W (min)

1.0 V (max)

2.5 V (min)

0.8 V (max)

Note 1: All voltages are measured with respect to the ground pins, unless otherwise specified.

Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is func-

tional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which guar-

antee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit is

given, however, the typical value is a good indication of device performance.

Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA , and the ambient temperature TA. The maximum

allowable power dissipation is PDMAX = (TJMAX − T A)/θJA or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM4870, TJMAX =

+150˚C, and the typical junction-to-ambient thermal resistance, when board mounted, is 100˚C/W.

Note 4: Human body model, 100 pF discharged through a 1.5 kΩ resistor.

Note 5: Machine Model, 200 pF–240 pF discharged through all pins.

Note 6: Typicals are measured at 25˚C and represent the parametric norm.

Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

www.national.com

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LM4870 amplifier

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LM4870 반도체 회로 부품 판매점

1.1W Audio Power Amplifier with Shutdown Mode

국내 전력반도체 판매점

일반적인 전자부품 판매점

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