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 • • 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 --- -2.6V to -6.0V DIP/DMP/SSOP 14 ■ BLOCK DIAGRAM VDD Internal CR Osscilator Block VRV RV VIN Poff C1+ C1C2C2+ Ver.2011-02-03 Capacitor Volatage Converter Block fsw=2.5KHz TYP Vreg VOUT -1- NJU7670 ■ TERMINAL DESCRIPTION No. SYMBOL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 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. VDD= 0V VIN=-5V VOUT=3･VIN=-15V (2) (3) Voltage Reference Circuit The voltage reference circuit is generating the reference voltage for a voltage regulator. 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 VDD Poff Voltage Regulator RV Vreg -2- Poff Level Vreg Output "H" (Connect to VDD) ON "L" (Connect to VIN) OFF Control signal RRV=100kΩ～1MΩ Ver.2011-02-03 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 10μF + C1 5V 0.1μF CIN 10μF + C2 1 C1+ VDD 14 2 C1- NC 13 3 C2+ NC 12 4 C2- NJU7670 Poff 11 Sealed Line 5 NC RV 10 6 NC Vreg 9 7 VIN VOUT 8 R1 RRV 100k～1MΩ 10μF C4 R2 VOUT=-15V VIN=-5V + RRV Vreg=-8V= V R1 RV + 10μF C3 The IC may have a possibility not to operate properly with unstable supply voltage due to large transient current when the capacitor is charged or discharged. The decoupling capacitor (CIN) connect as close as possible to the IC. Ver.2011-02-03 -3- NJU7670 ■ ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL Supply Voltage Input Voltage Output Voltage VIN VI1 VI2 VOUT Power Dissipation Operating Temperature Range Storage Temperature PD Topr Tstg (Ta=25°C) UNIT RATINGS |VDD －VDD| ≤ 20 VIN -0.5 to +0.5 Note1) VOUT -0.5 to +0.5 Note2) -20.0 700 DIP 300 DMP 250 SSOP -20 to +75 -40 to +125 V V V mW °C °C Note1): Apply to Poff terminal Note2): Apply to RV terminal ■ ELECTRICAL CHARACTERISTICS (VDD=0V, VIN=－5V, CIN=0.1µF, Ta=25°C) Note3) PARAMETER Supply Voltage Output Voltage Regulator Operating Voltage SYMBOL VIN VOUT Vreg V(OUT Current Consumption 1 IDD1 Current Consumption 2 IDD2 Output Impedance Power Conversion Rate ROUT Peff Line Regulation Load Regulation Output Saturation Resistance Δ Vreg Δ VOUT・Vreg Δ Vreg Δ Ireg RSAT TEST CONDITION MIN. -6.0 -18.0 -18.0 -18.0 TYP. − − − − MAX. -2.6 − -2.6 -8.0 UNIT V − 75 120 µA − 60 100 µA − 90 150 95 200 − Ω % − 0.2 − %/V VOUT = -15V, Vreg = -8V 0 < Ireg < 20mA − 5.0 − Ω RＳＡＴ = Δ (Vreg - VOUT) /Δ Ireg 0 < Ireg < 20mA, RV = VDD − 8.0 − Ω RL = ∞, RRV = 1MΩ, VOUT = -18V Poff=”H” note4) RL = ∞, RRV = 1MΩ, Vreg = -2.6V Poff=”L” note4) RL = ∞, RRV = 1MΩ IOUT = 20mA,C1 = C2 = C3 = 10µA IOUT = 5mA,C1 = C2 = C3 = 10µA -18V < VOUT < -8V Vreg = -8V, RL = ∞ -1.5 −2.3 − − − − 2.5 − Note3): To achieve the best operation, select the input capacitor (CIN) with enough margin according supply voltage. Note4): Excluding input current on RRV Reference Voltage Input Current 1 Input Current 2 Switching Frequency -4- VRV IIN1 IIN2 fsw RV Terminal Poff Terminal V V -1.0 V 1.0 µA 2.0 µA kHz − to the stability of Ver.2011-02-03 NJU7670 ■ APPLICATION CIRCUITS (1) (1-1) Tripler Operation 10μF + C1 5V 0.1μF CIN 10μF + C2 1 C1+ VDD 14 2 C1- NC 13 3 C2+ NC 12 4 C2- 5 NC RV 10 6 NC Vreg 9 7 VIN VOUT 8 NJU7670 Poff 11 VOUT=-15V VIN=-5V + 10μF C3 The IC may have a possibility not to operate properly with unstable supply voltage due to large transient current when the capacitor is charged or discharged. The decoupling capacitor (CIN) connect as close as possible to the IC. (1-2) Doubler Operation 5V 0.1μF CIN 10μF + C2 1 C1+ VDD 14 2 C1- NC 13 3 C2+ NC 12 4 C2- 5 NC RV 10 6 NC Vreg 9 7 VIN VOUT 8 NJU7670 Poff 11 VOUT=-10V VIN=-5V + 10μF C3 The IC may have a possibility not to operate properly with unstable supply voltage due to large transient current when the capacitor is charged or discharged. The decoupling capacitor (CIN) connect as close as possible to the IC. Ver.2011-02-03 -5- NJU7670 ■ APPLICATION CIRCUITS (2) (2) Parallel Connection 10μF + C1 5V 0.1μF CIN 10μF + C2 1 C1+ VDD 14 2 C1- NC 13 C2+ NC 12 3 NJU7670 Poff 11 10μF + C1 0.1μF CIN 10μF + C2 1 C1+ VDD 14 2 C1- NC 13 3 C2+ NC 12 4 C2- NJU7670 Poff 11 Sealed Line R1 RRV + 10μF C4 R2 4 C2- 5 NC RV 10 5 NC RV 10 6 NC Vreg 9 6 NC Vreg 9 7 VIN VOUT 8 7 VIN VOUT 8 VOUT=-10V VOUT=-15V VIN=-5V +10μF C3 * 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. * The IC may have a possibility not to operate properly with unstable supply voltage due to large transient current when the capacitor is charged or discharged. The decoupling capacitor (CIN) connect as close as possible to the IC. Ver.2011-02-03 -6- NJU7670 ■ TYPICAL CHARACTERISTICS (CIRCUITS CONDITION : Tripler Operation + Voltage Regulator Operation) NJU7670 Regulator Output Voltage vs.Input Voltage NJU7670 Output Voltage vs.Input Voltage -20 -18 -18 Regulator Output Voltage : Vreg (V) -20 Output Voltage : Vo (V) -16 -14 -12 -10 -8 -6 @:Ta=25°C -4 -16 -14 -12 -10 -8 -6 @:Ta=25°C -4 -2 -2 0 0 0 -2 -4 -6 Supply Voltage : V IN (V) 0 -8 -20 -18 -18 -16 -16 Output Voltage : Vo (V) Output Voltage : Vo (V) -20 -14 -12 -10 -8 -6 @:Ta=25°C V IN=-5V -2 -4 -6 Supply Voltage : V IN (V) -8 NJU7670 Output Voltage vs.Regulator Output Current NJU7670 Output Voltage vs.Regulator Output Current -4 -2 -14 -12 -10 -8 -6 @:Ta=25°C V IN=-5V -4 -2 0 0 0 5 10 15 Regulator Output Current : Ireg (m A) 20 0 5 10 15 Regulator Output Current : Ireg (m A) 20 NJU7670 Charge Pum p Capacitor Frequency vs.Input Voltage Charge Pump Capacitor Frequency : f(kHz) 3.0 2.5 2.0 1.5 [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. 1.0 @:Ta=25°C 0.5 0.0 0 Ver.2011-02-03 -1 -2 -3 -4 Supply Voltage : V IN(V) -5 -6 -7-