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| NJU7670 VOLTAGE TRIPLER GENERAL DESCRIPTION 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. PACKAGE OUTLINE PRELIMINARY NJU7670D NJU7670M NJU7670V PIN CONFIGURATION 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 Ver.2003-07-18 -1- NJU7670 TERMINAL DESCRIPTION No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 SYMBOL C1+ C1C2+ C2NC NC VIN VOUT Vreg RV Poff NC NC VDD FUNCTION Charge Pump Capacitor 1(+) Connecting Terminal Charge Pump Capacitor 1(-) Connecting Terminal Charge Pump Capacitor 2(+) Connecting Terminal Charge Pump Capacitor 2(-) Connecting Terminal Non Connection Non Connection Power Supply Terminal (-) Voltage Output Terminal Voltage Regulator Output Terminal Voltage Regulator Adjustment Terminal Vreg Output ON/OFF Control Terminal Non Connection Non Connection Power Supply Terminal (+) FUNCTIONAL DESCRIPTION (1) Voltage Converter The voltage converter generates double or triple voltage against VIN. (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 Poff Level Vreg Output ON OFF "H" (Connect to VDD) "L" (Connect to VIN) -2- Ver.2003-07-18 NJU7670 (3-2) Example of the Voltage Regulation The voltage regulator has a output terminal which can be adjusted the output voltage to any kind of voltage by resistance RRV. As the RV terminal input impedance is high. Therefore special care against noise is required. (Use a sealed line or others noise-proof method) Tripler Operation + Voltage Regulator Operation Ver.2003-07-18 -3- NJU7670 ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Input Voltage Output Voltage Power Dissipation Operating Temperature Range Storage Temperature Range SYMBOL VIN VI1 VI2 VOUT PD Topr Tstg RATINGS (Ta = 25C) UNIT V Note 2) V V mW C C VDD - VOUT 20 VIN -0.5 to + 0.5 VOUT -0.5 to + 0.5 -20.0 700 (DIP) 300 (DMP) 250 (SSOP) -20 to +75 -40 to +125 Note 1) Note1) Apply to POFF terminal Note2) Apply to RV terminal ELECTRICAL CHARACTERISTIC (VDD = 0V, VIN = -5V, Ta = 25C) PARAMETER Supply Voltage Output Voltage Regulator Operating Voltage Current Consumption 1 Current Consumption 2 Output Impedance Power Conversion Rate Line Regulation Load Conversion Output Saturation Resistance Reference Voltage Input Current 1 Input Current 2 Switching Frequency SYMBOL VIN VOUT Vreg VOUT IDD1 IDD2 ROUT Peff RL = , RRV = 1M, VOUT = -18V CONDITIONS MIN. -6.0 -18.0 -18.0 -18.0 TYP. 75 60 150 95 0.2 5.0 8.0 -1.5 2.5 MAX. -2.6 -2.6 -8.0 120 100 200 -1.0 1.0 2.0 UNIT V V V V A A % %/v V A A kHz Poff = "H" Note 3) RL = , RRV = 1M, Vreg = -2.6V Poff = "L" RL = , RRV = 1M Note 3) 90 -2.3 - IOUT = 20mA, C1 = C2 = C3 = 10F IOUT = 5mA, C1 = C2 = C3 = 10F Vreg -18V < VOUT < -8V VOUT Vreg Verg =-8V, RL = Vreg Ireg RSAT VRV IIN1 IIN2 fSW RV Terminal VOUT = -15V, Vreg = -8V 0 < Ireg < 20mA RSAT = (Vreg -VOUT) / Ireg 0 < Ireg < 20mA, RV = VDD Poff Terminal Note 3) Excluding input current on RRV. -4- Ver.2003-07-18 NJU7670 APPLICATION CIRCUITS (1) (1-1) Tripler Operation (1-2) Doubler Operation Ver.2003-07-18 -5- NJU7670 APPLICATION CIRCUIT (2) Parallel Connection (2) * The output impedance ROUT can be reduced by parallel connection. * C3 is a stabilizing capacitor output for stabilized voltage. * In the parallel connection, one stabilizing capacitor using is better way. [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. -6- Ver.2003-07-18 |
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