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NJU8753

PRELIMINARY

Analog Signal Input Class D Amplifier

with DC-DC Converter for Piezo Speaker

GENERAL DESCRIPTION

The

NJU8753

is an analog signal input class D power

amplifier with DC-DC converter for Piezo speaker. Input

part operates on 2.85V(typ) and a built-in DC-DC

converter generates variable output voltage(up to 12V)

with input voltage(2.6 to 4.2V). Therefore, it drives

Piezo speaker with louder sound and high efficiency.

The

NJU8753

incorporates BTL amplifier, which

eliminate AC coupling capacitors, capable of driving

monaural Piezo speaker with simple external LC

low-pass filters.

Class D operation achieves lower power operation for

Piezo speaker, thus the NJU8753 is suited for battery-

powered applications.

PACKAGE OUTLINE

NJU8753KN1

FEATURES

Piezo Speaker Driving

Output voltage: 8Vrms(Typ.) @V

DDO

=10.0V

1-channel Analog Signal Input, 1-channel BTL output

Standby(Hi-Z),

Built-in DC-DC Converter

Built-in Low Voltage Detector

Built-in Short Protector

Operating Voltage

:2.6~3.6V(V

DD

, V

REG

)

:2.6~4.2V(V

BAT

)

CMOS Technology

Package Outline

:QFN28

PIN CONFIGURATION

28

1

TEST1

TEST3

V

REG

FB

V

SS

V

SS1

V

SS1

V

DD

V

SS

IIN

COM

EN1

TEST2

V

DDO

V

DDO

OUT

P

V

SS

NC

V

SS

OUT

N

V

DDO

QFN28

Ver.2003-09-26

V

OUT

VR

EN2

NC

V

DDO

L

X

L

X

-1-

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