NJU72501 Piezo-sounder Driver with Multi-mode charge pump GENERAL DESCRIPTION PACKAGE OUTLINE The NJU72501 is a switching driver with multi mode charge pump for piezo-sounder. It can drive outputs up to 18Vpp from 3V supply. For adjusting the piezoelectric sounder sound volume, the charge pump can operate in either of a 1x, 2x or 3x mode. NJU72501MJE NJU72501MG2 Because NJU72501 has the shutdown function, it is suitable for the battery application. APPLICATION NJU72501V Healthcare, Wrist Watches, Alarm Clocks, Handheld GPS devices, PDAs FEATURES Operating Voltage : 2.3 to 5.0V(1x/ 2x Mode), 2.3 to 3.4V(3x Mode) Consumption current (Active) : I =0.3mA typ. (VIN=3V, DIN=4kHz, C =15nF, 1x Mode) DS PIEZO (Shutdown): I =1uA max. (VIN=3V , DIN=0V) DS Multi-Mode Charge Pump (1x/2x/3x) Input Signal Detector & Shutdown Control Output Short-circuit Protection Circuit C-MOS Technology Package Outline : EQFN12-JE, EQFN16-G2, SSOP14 Direct replacement to MAS6240 BLOCK DIAGRAM C =0.1uF C =0.1uF 1 2 CP1 CN1 CP2 CN2 VIN C =0.1uF IN Oscillator Charge Pump VOUT (1MHz) (1x / 2x / 3x) C =0.1uF OUT EN1 Control Logic EN2 1.7M Short Circuit DET Protection DIN VO1 piezo sounder Level Shift 1.7M GND VO2 Ver. 7.1 - 1 - NJU72501 TERMINAL CONFIGURATION (EQFN12-JE) 7pin 10pin Exposed Pad (Back Side) 4pin Top view 1pin PIN DESCRIPTION Pin No. SYMBOL FUNCTION 1 EN1 Step-up Mode Switch Terminal 1 2 EN2 Step-up Mode Switch Terminal 2 3 DIN Input Terminal 4 CN1 Capacitor Connection Terminal 5 GND GND Terminal 6 VO2 Output Terminal 2 7 VO1 Output Terminal 1 8 CN2 Capacitor Connection Terminal 9 CP1 Capacitor Connection Terminal 10 VOUT Charge Pump Output Terminal 11 CP2 Capacitor Connection Terminal 12 VIN Power Supply Terminal Exp Pad Exposed Pad Exposed Pad connected to GND or left floating Ver.7.1 - 2 -