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.
■
FEATURES
•
•
•
•
•
•
•
•
Triple / Double Voltage Output
Operating Voltage
--- -2.6V to -6.0V
High-efficiency Voltage Conversion Rate
--- 95% (I
OUT
= 5mA)
High Output Current
--- MAX 20mA (V
IN
= -5V)
CR Oscillator ON-Chip
Output - OFF Function By External Signal
--- ON / OFF of V
reg
C-MOS Technology
Package Outline
DIP/DMP/SSOP 14
■
PACKAGE OUTLINE
■
BLOCK DIAGRAM
V
DD
Internal
CR
Osscilator
Block
V
IN
V
RV
RV
Poff
C1+
C1-
C2-
C2+
Capacitor
Volatage
Converter
Block
fsw=2.5KHz
TYP
V
reg
V
OUT
Ver.2011-02-03
-1-
NJU7670
■
TERMINAL DESCRIPTION
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SYMBOL
C1+
C1-
C2+
C2-
NC
NC
V
IN
V
OUT
V
reg
RV
Poff
NC
NC
V
DD
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
V
reg
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 V
IN
.
V
DD
= 0V
V
IN
=-5V
V
OUT
=3½V
IN
=-15V
(2)
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
V
DD
Poff
Voltage
Regulator
RV
V
reg
(3)
Poff Level
Vreg Output
ON
OFF
Control signal
R
RV
=100kΩ½1MΩ
"H" (Connect to V
DD
)
"L" (Connect to V
IN
)
-2-
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 R
RV
.
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
1
2
3
4
5
6
7
C1+
C1-
C2+
C2-
NC
NC
V
IN
+
V
DD
NC
NC
14
13
R1
R2
R
RV
100k½1MΩ
+
10μF
C4
5V
0.1μF
C
IN
10μF
+
C2
12
NJU7670
Poff
11
Sealed Line
RV
V
reg
V
OUT
10
9
8
V
IN
=-5V
10μF
C3
V
OUT
=-15V
R
RV
V
reg
=-8V= V
RV
R1
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 (C
IN
) 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
Power Dissipation
Operating Temperature
Range
Storage Temperature
Note1): Apply to
Poff
terminal
Note2): Apply to RV terminal
■
ELECTRICAL CHARACTERISTICS
(V
DD
=0V, V
IN
=－5V, C
IN
=0.1µF, Ta=25°C) Note3)
PARAMETER
Supply Voltage
Output Voltage
Regulator Operating Voltage
Current Consumption 1
Current Consumption 2
Output Impedance
Power Conversion Rate
Line Regulation
Load Regulation
Output Saturation Resistance
Reference Voltage
Input Current 1
Input Current 2
Switching Frequency
SYMBOL
V
IN
V
OUT
V
reg
V
(OUT
I
DD1
I
DD2
R
OUT
P
eff
Δ
V
reg
Δ
V
OUT
・V
reg
Δ
V
reg
Δ
I
reg
RATINGS
|V
DD
－V
DD
|
≤
20
V
IN
-0.5 to +0.5
Note1)
V
OUT
-0.5 to +0.5 Note2)
-20.0
700
DIP
300
250
DMP
SSOP
-20 to +75
-40 to +125
(Ta=25°C)
UNIT
V
V
V
mW
°C
°C
V
IN
V
I1
V
I2
V
OUT
P
D
Topr
Tstg
TEST CONDITION
RL =
∞,
R
RV
= 1MΩ, V
OUT
= -18V
MIN.
-6.0
-18.0
-18.0
-18.0
−
−
−
90
−
−
−
TYP.
−
−
−
−
75
60
150
95
0.2
5.0
8.0
MAX.
-2.6
−
-2.6
-8.0
120
100
200
−
−
−
−
UNIT
V
V
V
µA
µA
Ω
%
%/V
Ω
Ω
Poff=”H”
note4)
RL =
∞,
R
RV
= 1MΩ, V
reg
= -2.6V
Poff=”L”
note4)
RL =
∞,
R
RV
= 1MΩ
I
OUT
= 20mA,C1 = C2 = C3 = 10µA
I
OUT
= 5mA,C1 = C2 = C3 = 10µA
-18V < V
OUT
< -8V
V
reg
= -8V, RL =
∞
V
OUT
= -15V, V
reg
= -8V
0 < I
reg
< 20mA
R
ＳＡＴ
=
Δ
(V
reg
- V
OUT
) /Δ I
reg
0 < I
reg
< 20mA, RV = V
DD
R
SAT
V
RV
I
IN1
I
IN2
f
sw
-1.5
−2.3
RV Terminal
−
−
Poff Terminal
−
−
2.5
−
Note3): To achieve the best operation, select the input capacitor (C
IN
) with enough margin according
supply voltage.
Note4): Excluding input current on R
RV
-1.0
V
1.0
µA
2.0
µA
kHz
−
to the stability of
-4-
Ver.2011-02-03
NJU7670
■
APPLICATION CIRCUITS (1)
(1-1)
Tripler Operation
10μF
+
C1
1
2
3
4
5
6
7
C1+
C1-
C2+
C2-
NC
NC
V
IN
+
V
DD
NC
NC
14
13
12
5V
0.1μF
C
IN
10μF
+
C2
NJU7670
Poff
11
RV
V
reg
V
OUT
10
9
8
V
IN
=-5V
10μF
C3
V
OUT
=-15V
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 (C
IN
) connect as close as possible to the IC.
(1-2)
Doubler Operation
1
2
3
4
5
6
7
C1+
C1-
C2+
C2-
NC
NC
V
IN
+
V
DD
NC
NC
14
13
12
5V
0.1μF
C
IN
10μF
+
C2
NJU7670
Poff
11
RV
V
reg
V
OUT
10
9
8
V
IN
=-5V
10μF
C3
V
OUT
=-10V
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 (C
IN
) connect as close as possible to the IC.
Ver.2011-02-03
-5-
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