SM6802A

NIPPON PRECISION CIRCUITS INC.—1

Class-D Stereo Amplifier for Portable Device

OVERVIEW

The SM6802A is an analog-input, class-D stereo amplifier. Class-D operation provides high efficiency and low

power consumption. The device also incorporates an original real-time operation dynamic range compression

function that effectively suppresses the distortion in the saturation level region output by soft-clipping, boost-

ing the average sound pressure from the speaker during playback. It also incorporates an input equalizer pin for

output speaker frequency characteristics adjustment. These features make the device ideal for use in mobile

telephones and speaker applications requiring miniaturization and high-efficiency. The output stage has a BTL

output configuration where the output waveform inverts only the modulation components, enabling direct drive

connection, without using an LC filter, to a dynamic speaker. The device is available in miniature 20-pin QFN

packages, and requires only a peripheral chip capacitor to form a miniature amplifier circuit.

FEATURES

I

Operating supply voltage: 2.7 to 5.5V

I

Low current consumption: 6mA

(VDD1 = VDD2 = VDD3 = 3.6V)

I

Output power: 0.7W + 0.7W

(VDD1 = VDD2 = VDD3 = 3.6V, 8

Ω load)

I

Output fundamental frequency: 125kHz

I

Gain

• 6dB (Normal)

• 15dB to 6dB automatic adjustment in response

to the input level

(Dynamic range compression mode)

I

Silicon-gate CMOS process

I

Package: 20-pin QFN

APPLICATIONS

I

Cellular phone

I

PDA

I

Digital still camera

ORDERING INFORMATION

PINOUT

(Top view)

PACKAGE DIMENSIONS

(Unit: mm)

Device

Package

SM6802AB

20-pin QFN

67 89 10

20 19 18 17 16

15

14

13

12

11

1

2

3

4

5

VDD3

LOUTP

VSS2

ROUTP

VDD2

LEQP

LIN

VDD1

RIN

REQP

4.20 ± 0.20

4.00 ± 0.10

1

0.50

0.60 ± 0.10

0.22 ± 0.05

0.05

0.05 M