NJU7670V-TE1

NJU7670 VOLTAGE TRIPLER GENERAL DESCRIPTION PACKAGE OUTLINE The NJU7670 is a voltage tripler incorporated CR oscillator, voltage converter, reference voltage circuit and voltage regulator. It can generates triple or double negative voltage of an operating voltage ranging from -2.6V to -6V. The application circuit of tripler requires three capacitors, and doubler requires only two capacitors. Furthermore, any kind of output voltage is available by the internal voltage regulator. FEATURES Triple / Double Voltage Output Operating Voltage --- -2.6V to -6.0V High-efficiency Voltage Conversion Rate --- 95% (IOUT = 5mA) High Output Current --- MAX 20mA (VIN = -5V) CR Oscillator ON-Chip Output - OFF Function By External Signal --- ON / OFF of Vreg C-MOS Technology Package Outline DIP/DMP/SSOP 14 BLOCK DIAGRAM V DD V RV Internal CR RV Osscilator Block V IN Poff C1+ Capacitor Volatage V reg C1- Converter Block C2- fsw=2.5KHz TYP V OUT C2+ Ver.2011-02-03 - 1 - NJU7670 TERMINAL DESCRIPTION No. SYMBOL FUNCTION 1 C1+ Charge Pump Capacitor 1(+) Connecting Terminal 2 C1- Charge Pump Capacitor 1(-) Connecting Terminal 3 C2+ Charge Pump Capacitor 2(+) Connecting Terminal 4 C2- Charge Pump Capacitor 2(-) Connecting Terminal 5 NC Non Connection 6 NC Non Connection 7 V Power Supply Terminal (-) IN 8 V Voltage Output Terminal OUT 9 V Voltage Regulator Output Terminal reg 10 RV Voltage Regulator Adjustment Terminal 11 Poff V Output ON/OFF Control Terminal reg 12 NC Non Connection 13 NC Non Connection 14 V Power Supply Terminal (+) DD FUNCTIONAL DESCRIPTION (1) Voltage Converter The voltage converter generates double or triple voltage against VIN. V = 0V DD =-5V V IN V =3V =-15V OUT IN (2) Voltage Reference Circuit The voltage reference circuit is generating the reference voltage for a voltage regulator. (3) Voltage Regulator The voltage regurator output stabilized voltage which regulated by using the external resistor against double or triple voltage of the input voltage. (3-1) Output-OFF Function As this circuit incorporated output-off function, the voltage regulator output (ON/OFF) is performed by the signal come from system. ON/OFF Control for Vreg Terminal V DD Poff Level Vreg Output Control signal Poff Voltage (Connect to VDD) ON Regulator RV R =100k 1M RV (Connect to VIN) OFF V reg Ver.2011-02-03 - 2 -