T
V
DD
V
IN
CAP1
CAP2
CAP1+
CAP2+
OSC1
OSC2
CR
Oscillator
Voltage
Converter
(I)
Voltage
Converter
(II)
Reference Voltage
Generator
Voltage Regulator
Temperature Gradient
Select Circuit
TC1
TC2
P
off
V
reg
V
out
RV
Booster
Regurator
DC-DC Converter
PF110-10
q
95% Typical Power Efficiency
q
Doubled or Tripled Output Voltage
q
Internal Voltage Regulator
SCI7661C
OA
/M
OA
s
DESCRIPTION
The SCI7661C
OA
/M
OA
CMOS DC-DC Converter features high operational performance with low power dissipation.
It consists of two major parts: the booster circuitry and the regulator circuitry. The booster generates a doubled
output voltage
(2.4 to 12V) or tripled output voltage
(3.6 to 18V) from the input
(1.2 to 6V). The regulator is
capable of setting the output to any desired voltage. The regulated voltage can be given one of the three threshold
temperature gradients.
s
FEATURES
q
High performance with low power dissipation
q
Simple conversion of V
IN
(5V) to |V
IN
| (+5V),
2 |V
IN
| (+10V), 2V
IN
(10V) or 3V
IN
(15V)
q
On-chip output voltage regulator
q
Power conversion efficiencyTyp. 95%
q
Temperature gradient for LCD power supply 0.1% /
C, 0.4%/
C or 0.6%/
C
q
Power off by external signals Stationary current at power off Max. 2
A
q
Cascade connectiontwo device connected:
V
IN
=5V, V
OUT
=20V
q
On-chip C'R oscillator
q
Package .................................... SCI7661C
0A
: DIP-14pin
(plastic)
SCI7661M
0A
: SOP5-14pin
(plastic)
SCI7661M
AA
: SSOP2-16pin
(plastic)
s
BLOCK DIAGRAM
Low Voltage
Operation
Products
2
SCI7661C
OA
/M
OA
s
PIN CONFIGURATION
s
PIN DESCRIPTION
s
ELECTRICAL CHARACTERISTICS
s
ABSOLUTE MAXIMUM RATINGS
CAP1+
CAP2+
CAP1-
CAP2-
TC1
TC2
V
IN
1
3
2
4
5
6
7
V
DD
P
off
V
reg
V
out
OSC1
OSC2
RV
14
11
9
8
13
12
10
The same pin configuration in
DIP and SOP
CAP1+, CAP1-
CAP2+, CAP2-
TC1, TC2
V
IN
V
OUT
Vreg
R
V
P
off
OSC2, OSC1
V
DD
1, 2
3, 4
5, 6
7
8
9
10
11
12, 13
14
Pin name
No.
Function
Terminal for connection of capacitor for doubler
Terminal for connection of capacitor for tripler
Temperature gradient selection terminal
Power supply terminal(negative, system supply
GND)
Output terminal at tripling
Regulated voltage output terminal
Regulated voltage control terminal
Vreg output ON/OFF control terminal
Oscillation resistor connection terminal
Power supply terminal(positive system supply
VCC)
Characteristic
Symbol
Condition
Min.
Typ.
Max.
Unit
(V
DD
= 0V, V
IN
=-5V, Ta=-30 to 85
C)
V
reg
V
OUT
V
reg
R
L
=
, R
RV
=1M
,
V
O
=-18V
R
L
=
, R
OSC
=1M
R
L
=
, R
RV
=1M
V
OUT
=-15V
-18V<V
OUT
<-8V,
V
reg
=-8V, R
L
=
, Ta=25
C
TC2=TC1=V
OUT
, R
L
=
R
OSC
=1M
I
OUT
=10mA
V
I
V
O
-6.0
-18.0
-1.2
V
V
V
OUT
Iopr
1
-18.0
60
50
20
150
-3.2
100
V
A
-18
Vreg
-2.6
V
Iopr
2
12.0
A
I
OUT
=5mA
95
Peff
%
0.2
%/V
I
Q
f
osc
R
OUT
16
90
2.0
24
200
A
kHz
Input supply voltage
Output voltage
Regulator operating voltage
Booster current consumption
Regulator current
consumption
Booster power conversion
efficiency
Regulated output voltage
fluctuation
Stationary current
Oscillation frequency
Output impedance
V
I
Input terminal voltage
OSC1, P
off
TC1, TC2, RV
Plastic package
Rating
Symbol
Remark
V
V
Unit
0.5
0.5
Max.
V
IN
-0.5
V
OUT
-0.5
V
O
P
d
T
opr
T
stg
T
sol
Output voltage
Allowable loss
Operating temperature
Storage temperature
Soldering temperature and time
V
mW
C
C
-
300
85
150
-20.0
-30
-55
V
I
Input supply voltage
V
0.5
-20/N
Min.
(V
DD
=0V)
260
C, 10s(at lead)
N
=
2 : Doubler
N
=
3 : Tripler
Note: When this IC is soldered in the solder-reflow process, be sure to maintain the reflow furnace at the curve shown in "Fig.
1-5 Reflow Furnace Temperature Curve" of this DATA BOOK. And this IC can not be exposed to high temperature of
the solder dipping.
3
SCI7661C
OA
/M
OA
s
RECOMMENDED OPERATING CONDITIONS
(V
IN=
-
1.2V ~
-
2.2V)
=C
1
=10
F
C
2
=10
F
+
-
+
+ -
-
1
2
3
4
5
6
7
14
13
12
11
10
9
8
R
OSC
=
1M
R
L
C
L
C
3
=22
F
D
1
(
V
F
(
I
F
=1mA
))
0.6v
5
4
3
2
1
0
0
1.5 2
3
4 5 6
V
STA2
V
STA1
V
IN
(
V)
Triple
Double
R
L
Min.
(
k
)
Characteristic
Symbol
Condition
Min.
Typ.
Max.
Unit
V
reg
I
OUT
| V
reg
(50
C) | - | V
reg
(0
C) |
50
C-0
C
CT =
1
| V
reg
(25
C) |
100
V
OUT
=-15V, V
reg
=-8V,
Ta=25
C
0<I
OUT
<10mA, TC1=V
DD
TC2=V
OUT
R
SAT
=D(Vreg--V
OUT
)/DI
OUT
0<I
OUT
<10mA, RV=V
DD
,
Ta=25
C
TC2=V
OUT
, TC1=V
DD
, Ta=25
C
TC2=TC1=V
OUT
, Ta=25
C
P
off
, TC1, TC2, OSC1, RV pins
5
5
R
SAT
V
V
V
-1.5
-1.3
-0.9
-1.0
-1.1
-0.8
-2.3
-1.7
-1.1
V
RV0
V
RV1
V
RV2
%/
C
%/
C
%/
C
-0.1
-0.4
-0.6
-0.06
-0.3
-0.5
-0.25
-0.5
-0.7
CT
0
CT
4
CT
2
A
2.0
I
L
Regulated output load
fluctuation
Regulated output saturation
resistance
Reference voltage
Temperature Gradient
Input leakage current
TC2=V
DD
, TC1=V
OUT
, Ta=25
C
Condition
Symbol
Remark
Unit
Max.
Min.
(Ta=-30 to 85
C)
R
OSC
=1M
, C
3
10
F*
1
C
L
/C
3
1/20, Ta=-20 to 85
C
R
OSC
=1M
R
OSC
=1M
V
V
V
mA
kHz
-2.2
2000
-1.2
20
30
-1.2
R
L
Min.*
2
10
V
STA2
V
STA1
V
STP
R
L
I
OUT
f
OSC
Booster start voltage
Booster stop voltage
Output load resistance
Output load current
Oscillation frequency
F
3.3
C
1
, C
2
, C
3
k
680
R
OSC
Capasitor for booster
Extarnal resistance for
oscillation
1000
k
100
R
RV
Regulated output adjustable
resistance
*1: Recommended circuity in low voltage operation is
shown below.
*2: R
L
Min. depends on input voltage as shown below.
4
SCI7661C
OA
/M
OA
s
PERFORMANCE CURVES
f
OSC
(kHz)
I
opr1
(
A)
f
OSC
(kHz)
P
eff
(%)
P
eff
(%)
V
reg
(V)
I
IN
(mA)
I
IN
(mA)
P
eff
(%)
P
eff
(%)
V
OUT
(V)
R
OUT
(
)
R
OSC
(
)
I
OUT
(mA)
I
OUT
(mA)
I
OUT
(mA)
f
OSC
(Hz)
I
OUT
(mA)
V
IN
(V)
1000
V
OUT
(V)
0
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
40
36
32
28
24
20
16
12
8
4
0
-5
0
400
300
200
100
0
0
1
2
3
4
5
6
7
-1
-2
-3
-4
-5
-6
-10
-15
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
100
10
1
20
30
10K
30
0
0
0
10
0
10
3
10
4
10
5
10
6
f
OSC
(Hz)
I
OUT
(A)
10
3
10
-4
10
-3
10
-2
10
-1
I
OUT
(A)
10
-4
10
-3
10
-2
10
-1
10
4
10
5
10
6
1
3
5
7
9
2
4
6
8
10
20
30
40
50
0
1
2
3
4
5
6
7
8
9
10
10
20
30
40
50
50
100
150
0
1
2
3
4
5
6
7
100K
680K1M
10M
V
IN
=-5V
V
IN
=-5V
V
IN
=-5V
V
IN
=-3V
V
IN
=-3V
V
IN
=-1.5V
V
IN
=-1.5V
V
IN
(V)
150
100
50
Ta=25
C
Ta=25
C
V
IN
=-5.0V
Ta=25
C
V
IN
=-2.0V
Ta=25
C
V
OUT
=-15V
Ta=25
C
V
OUT
=-6V
Ta=25
C
V
IN
=-5V
Ta=25
C
Ta=25
C
f
OSC
=40kHz
f
OSC
=20kHz
f
OSC
=10kHz
Ta(
C)
Fig.1 Oscillation Frequency(f
OSC
)vs.
External-Resistance(R
OSC
)
Fig.4 Output Voltage(V
OUT
)vs.
Output Current(I
OUT
)
Fig.7 Power Conversion Efficiency
(P
eff
)/Input Current(I
IN
)vs.
Output Current(I
OUT
)
Fig.10 Power Conversion Efficiency(P
eff
)
vs.Oscillation Frequency(f
OSC
)
Fig.11 Output Voltage(V
reg
)vs. Output
Current(I
OUT
)
Fig.12 Output Voltage(V
reg
)vs. Output
Current(I
OUT
)
Fig.8 Power Conversion Efficiency
(P
eff
)/Input Current(I
IN
)vs.
Output Current(I
OUT
)
Fig.9 Power Conversion Efficiency
(P
eff
)vs. Oscillation Frequency
(f
OSC
)
Fig.5 Output Voltage(V
OUT
)vs.
Output Current(I
OUT
)
Fig.6 Output Inpedance(R
OUT
)vs.
Input Voltage(V
IN
)
Fig.2 Oscillation Frequency(f
OSC
)vs.
Temperature(Ta)
Fig.3 Input Voltage(V
IN
)vs. Booster
Current Consumption(I
opr1
)
Double
Double
P
eff
Double P
eff
Double I
IN
Double I
IN
Double
Double
Triple
Triple P
eff
Triple P
eff
Triple
Triple
Triple
I
IN
Triple I
IN
V
IN
=-5.0V
V
IN
=-1.5V
I
OUT
=10mA
I
OUT
=4mA
I
OUT
=20mA
I
OUT
=30mA
I
OUT
=
5mA
I
OUT
=
2mA
I
OUT
=
0.5mA
I
OUT
=
1mA
I
OUT
=
2mA
-8.000
-7.950
-7.900
-7.850
V
reg
(V)
-3.000
-2.950
-2.900
-2.850
5
SCI7661C
OA
/M
OA
s
CIRCUIT DESCRIPTION
q
C-R Oscillator
The SCI7661C/M contains a C-R oscillator for internal
oscillation. It consists of an external resistor R
OSC
connected between the OSC1 pin and OSC2 pin.
q
Voltage Converters
The voltage converters double^triple the input supply voltage (V
IN
) using clocks generated by the C-R oscillator
q
Reference Voltage Generator and Voltage Regulator
The reference voltage generator produces reference
voltage needed for operation of regulator circuit. The
voltage regulator is used to regulate a boosted output
voltage and its circuit contains a power-off function which
uses signals from the system for on-off control of the
V
reg
output.
q
Temperature Gradient Selector Circut
The SCI7661C/M provides the V
reg
output with a temperature gradient suitable for LCD driving.
0.30
0.25
50
0
-50
0.20
0.15
0.10
0.05
0.00
V
OUT
=
-5V
V
OUT
=
-10V
C
T:
-0.1%/
C
C
T:
-0.4%/
C
C
T:
-0.6%/
C
V
OUT
=
-15V
I
OUT
(mA)
Ta(
C)
V
reg
(Ta) | - | V
reg
(25
C) |
0
-50
0
50
100
5
10
15
20
V
reg
-V
OUT
(V)
100(%)
| V
reg
(25
C) |
Fig:13 Regulated Output Saturation
Resistance(R
SAT
)V
reg
--V
OUT
--I
OUT
Fig:14 Output Voltage(v
reg
)vs.
Temperature(Ta)
Osc1
Osc2
Osc1
Osc2
R
OSC
C-R Oscillation
External Clock Operation
Open
External Clock
V
CC
V
DD
=0V
V
DD
=0V
V
IN
=-5V
V
IN
=-5V
CAP2=2V
IN
=-10V
V
OUT
=3V
IN
=-15V
(+5V)
(-5V)
GND
Typical Doubled Voltage Relations
Typical Tripled Voltage Relations
V
DD
P
off
V
reg
RV
Voltage Regulator
Control signal
R
RV
= 100k
to 1M
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