NJU8753

NJU8753 www.DataSheet4U.com 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 batterypowered applications. PACKAGE OUTLINE NJU8753KN1 FEATURES Piezo Speaker Driving Output voltage: 8Vrms(Typ.) @VDDO=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(VDD, VREG) :2.6~4.2V(VBAT) CMOS Technology Package Outline :QFN28 PIN CONFIGURATION 28 1 TEST1 TEST3 VREG FB VSS VSS1 VSS1 VDD VSS IIN COM EN1 TEST2 VDDO VDDO OUTP VSS NC VSS OUTN VDDO QFN28 Ver.2003-09-26 VOUT VR EN2 NC VDDO LX LX -1- NJU8753 www.DataSheet4U.com BLOCK DIAGRAM VDD VSS VREG VOUT LX VR FB EN2 TEST1 TEST2 TEST3 Switching Regulator VSS1 VDDO IN + COM + Pulse Width Modulator OUTP VSS VDDO OUTN VSS Short Protector Soft Start Control Logic ...