NJU7670
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1
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Ver.2011-02-03
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
Poff
RV
Internal
CR
Osscilator
Block
Capacitor
Volatage
Converter
Block
fsw=2.5KHz
TYP
C1+
C1-
C2-
C2+
VDD
VOUT
Vreg
VIN
VRV
NJU7670
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■ 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 VIN Power Supply Terminal (-)
8 VOUT Voltage Output Terminal
9 Vreg Voltage Regulator Output Terminal
10 RV Voltage Regulator Adjustment Terminal
11 Poff Vreg Output ON/OFF Control Terminal
12 NC Non Connection
13 NC Non Connection
14 VDD 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
"H" (Connect to VDD) ON
"L" (Connect to VIN) OFF
VDD= 0V
VIN=-5V
VOUT=3･VIN=-15V
Voltage
Regulator
VDD
Poff
RV
Vreg
RRV=100kΩ～1M
Ω
Control signal
NJU7670
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Ver.2011-02-03
(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
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.
+
++
+
10μF
C1
10μF
C2
0.1μF
CIN
5V
VIN=-5V
10μF
C3
Sealed Line
R1
R2
10μF
C4
VOUT=-15V
Vreg=-8V= VRV
RRV
R1
RRV
100k～1MΩ
1
2
3
4
5
6
14
13
12
11
10
9
87
NJU7670
VDD
NC
Poff
NC
RV
Vreg
VOUT
VIN
NC
NC
C2-
C2+
C1-
C1+
NJU7670
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■ ABSOLUTE MAXIMUM RATINGS (Ta=25°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 SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Supply Voltage VIN -6.0
− -2.6 V
VOUT -18.0 − −
Output Voltage Vreg RL = ∞, RRV = 1MΩ, VOUT = -18V -18.0 − -2.6 V
Regulator Operating Voltage V(OUT -18.0 − -8.0 V
Current Consumption 1 IDD1 Poff=”H” note4)
RL = ∞, RRV = 1MΩ, Vreg = -2.6V − 75 120 µA
Current Consumption 2 IDD2 Poff=”L” note4)
RL = ∞, RRV = 1MΩ − 60 100 µA
Output Impedance ROUT IOUT = 20mA,C1 = C2 = C3 = 10µA − 150 200 Ω
Power Conversion Rate Peff IOUT = 5mA,C1 = C2 = C3 = 10µA90 95 − %
Line Regulation
ΔVreg
ΔVOUT・Vreg
-18V < VOUT < -8V
Vreg = -8V, RL = ∞ − 0.2 − %/V
Load Regulation
ΔVreg
ΔIreg
VOUT = -15V, Vreg = -8V
0 < Ireg < 20mA − 5.0 − Ω
Output Saturation Resistance RSAT RＳＡＴ = Δ(Vreg - VOUT) /ΔIreg
0 < Ireg < 20mA, RV = VDD − 8.0 − Ω
Reference Voltage VRV −2.3 -1.5 -1.0 V
Input Current 1 IIN1 RV Terminal − − 1.0 µA
Input Current 2 IIN2 Poff Terminal − − 2.0 µA
Switching Frequency fsw − 2.5 − kHz
Note3): To achieve the best operation, select the input capacitor (CIN) with enough margin according to the stability of
supply voltage.
Note4): Excluding input current on RRV
PARAMETER SYMBOL RATINGS UNIT
Supply Voltage VIN |VDD －VDD| ≤20 V
VI1 V
IN -0.5 to +0.5 Note1)
Input Voltage VI2 V
OUT -0.5 to +0.5 Note2) V
Output Voltage VOUT -20.0 V
700 DIP
300 DMP
Power Dissipation PD
250 SSOP
mW
Operating Temperature Range Topr -20 to +75 °C
Storage Temperature Tstg -40 to +125 °C
NJU7670
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Ver.2011-02-03
■ APPLICATION CIRCUITS (1)
(1-1) Tripler Operation
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
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.
+
+
+
10μF
C1
10μF
C2
0.1μF
CIN
5V
VIN=-5V
10μF
C3
VOUT=-15V
1
2
3
4
5
6
14
13
12
11
10
9
87
NJU7670
VDD
NC
Poff
NC
RV
Vreg
VOUT
VIN
NC
NC
C2-
C2+
C1-
C1+
+
+
10μF
C2
0.1μF
CIN
5V
VIN=-5V
10μF
C3
VOUT=-10V
1
2
3
4
5
6
14
13
12
11
10
9
87
NJU7670
VDD
NC
Poff
NC
RV
Vreg
VOUT
VIN
NC
NC
C2-
C2+
C1-
C1+
NJU7670
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Ver.2011-02-03
■APPLICATION CIRCUITS (2)
(2) Parallel Connection
* 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.
+
+
10μF
C1
10μF
C2
0.1μF
CIN
5V
VIN=-5V
1
2
3
4
5
6
14
13
12
11
10
9
87
NJU7670
VDD
NC
Poff
NC
RV
Vreg
VOUT
VIN
NC
NC
C2-
C2+
C1-
C1+ ++
+
10μF
C1
10μF
C2
0.1μF
CIN
10μF
C3
Sealed Line
R1
R2
10μF
C4
VOUT=-15V
RRV
1
2
3
4
5
6
14
13
12
11
10
9
87
NJU7670
VDD
NC
Poff
NC
RV
Vreg
VOUT
VIN
NC
NC
C2-
C2+
C1-
C1+
+
VOUT=-10V
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Ver.2011-02-03
■TYPICAL CHARACTERISTICS (CIRCUITS CONDITION : Tripler Operation + Voltage Regulator Operation)
NJU7670
Output Voltage vs.Regulator Output Current
-20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
0 5 10 15 20
Regulator Output Current : Ireg (mA)
Output Voltage : Vo (V)
@:Ta=25°C
VIN=-5V
NJU7670
Output Voltage vs.Regulator Output Current
-20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
0 5 10 15 20
Regulator Output Current : Ireg (mA)
Output Voltage : Vo (V)
@:Ta=25°C
VIN=-5V
NJU7670
Charge Pump Capacitor Frequency vs.Input Voltage
0.0
0.5
1.0
1.5
2.0
2.5
3.0
-6-5-4-3-2-10
Supply Voltage : VIN(V)
Charge Pump Capacitor Frequency :
f(kHz)
@:Ta=25°C
NJU7670
Output Voltage vs.Input Voltage
-20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
-8-6-4-20
Supply Voltage : VIN (V)
Output Voltage : Vo (V)
@:Ta=25°C
NJU7670
Regulator Output Voltage vs.Input Voltage
-20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
-8-6-4-20
Supply Voltage : VIN (V)
Regulator Output Voltage : Vreg (V)
@:Ta=25°C
[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.
