Datasheet SCI7661C0A, SCI7661M0A, SCI7661MAA Datasheet (Epson)

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

● 95% Typical Power Efficiency

● Doubled or Tripled Output Voltage

● Internal Voltage Regulator

SCI7661C

OA

/M

OA

■ DESCRIPTION

The SCI7661COA/

MOACMOS 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.

■ FEATURES

● High performance with low power dissipation

● Simple conversion of V

IN

(–5V) to |VIN| (+5V),

2 |VIN| (+10V), 2V

IN

(–10V) or 3V

IN

(–15V)

● On-chip output voltage regulator

● Power conversion efficiency–Typ. 95%

● Temperature gradient for LCD power supply – 0.1% / °C, 0.4%/°C or 0.6%/ °C

● Power off by external signals – Stationary current at power off – Max. 2 µA

● Cascade connection–two device connected:

VIN=–5V, V

OUT

=–20V

● On-chip C'–R oscillator

● Package .................................... SCI7661C0A: DIP-14pin (plastic)

SCI7661M0A: SOP5-14pin (plastic)
SCI7661MAA: SSOP2-16pin (plastic)

■ BLOCK DIAGRAM

Low Voltage

Operation

Products

2

SCI7661C

OA

/M

OA

■ PIN CONFIGURATION ■ PIN DESCRIPTION

■ ELECTRICAL CHARACTERISTICS

■ ABSOLUTE MAXIMUM RATINGS

CAP1+

CAP2+

CAP1-

CAP2­TC1

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+, CAP1­CAP2+, CAP2­TC1, 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 ConditionMin. Typ. Max. Unit

(VDD = 0V, VIN=-5V, Ta=-30 to 85°C)

∆V

reg

∆V

OUT•Vreg

RL=∞, RRV=1MΩ,
V

O

=-18V

R

L

=∞, R

OSC

=1MΩ

R

L

=∞, RRV=1MΩ

V

OUT

=-15V

-18V<V

OUT

<-8V,

V

reg

=-8V, RL=∞, Ta=25°C

TC2=TC1=V

OUT

, RL=∞

R

OSC

=1MΩ

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

µA

-18Vreg -2.6 V

Iopr

2

12.0 µA

I

OUT

=5mA95Peff %

0.2 %/V

I

Q

f

osc

R

OUT

16

90

2.0
24

200

µA

kHz

Ω

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 V0.5-20/N

Min.

(VDD=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

■ RECOMMENDED OPERATING CONDITIONS

(V

IN

=

-

1.2V ~ -2.2V)

=C1=10µF

C

2

=10µF

+

­+

+-

-

1
2

3
4
5
6

7

14
13

12
11
10

9
8

R

OSC

=

1MΩ

R

L

C

L

C

3

=22µ

F

D

1

(

V

F

(

IF=

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

Ω

)

Characteristic Symbol ConditionMin. 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=VDD,

Ta=25°C
TC2=V

OUT

, TC1=VDD, Ta=25°C

TC2=TC1=V

OUT

, Ta=25∞C

P

off

, TC1, TC2, OSC1, RV pins

Ω5

Ω5R

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

µA2.0I

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 RemarkUnitMax.Min.

(Ta=-30 to 85°C)

R

OSC

=1MΩ, C

3

≥

10µF*

1

CL/C

3

≤

1/20, Ta=-20 to 85°C

R

OSC

=1MΩ

R

OSC

=1MΩ

V

V

V

Ω

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

µF

3.3

C

1

, C2, C

3

kΩ680R

OSC

Capasitor for booster

Extarnal resistance for
oscillation

1000 kΩ100R

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

■ PERFORMANCE CURVES

f

OSC

(kHz)

I

opr1

(µA)

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

(Ω)

R

OSC

(Ω)

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

01234567

-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

010

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

13579246810

20 30 40 50

012345678910

10 20 30 40 50

50 100 150 0 1 2 3 4 5 6 7

100K 680K1M 10M

V

IN

=-5V

VIN=-5V

VIN=-5V

VIN=-3V

V

IN

=-3V

VIN=-1.5V

V

IN

=-1.5V

V

IN

(V)

150

100

50

Ta=25°C

Ta=25°C

VIN=-5.0V

Ta=25°C

VIN=-2.0V

Ta=25°C

V

OUT

=-15V

Ta=25°C

V

OUT

=-6V

Ta=25°C

VIN=-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(IIN)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(IIN)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(VIN)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

VIN=-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

■ CIRCUIT DESCRIPTION

● 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.

● Voltage Converters
The voltage converters doubleÅ^triple the input supply voltage (VIN) using clocks generated by the C-R oscillator

●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.

● 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

5101520

V

reg

-V

OUT

(V)

×

100(%)

| V

reg

(25°C) |

Fig:13 Regulated Output Saturation
Resistance(R

SAT)Vreg—VOUT

—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

VDD=0V

V

DD

=0V

V

IN

=-5V

V

IN

=-5V

CAP2=2V

IN

=-10V

V

OUT

=3VIN=-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

= 100kΩ to 1MΩ

6

SCI7661C

OA

/M

OA

5V

V

IN

=-5V V

OUT

=-15V

C

1

C

2

C

3

10µF

10µF

10µF

1
2
3

4
5
6
7

14
13
12

11
10

9
8

R

OSC

1MΩ

Voltage Tripler

+

+

−

+

−

–

5V

V

IN

=-5V

V

OUT

=-15V

V

reg

=-8V=

C

1

C

4

R

RV

R

1

R

RV

C

2

C

3

10µF

10µF

10µF

10µF

1
2
3
4
5

6
7

14
13
12

11
10

9
8

R

OSC

Tripler+Regulator

(-0.4%/°C selected as temperature gradient)

+

+

−
+

−

−

1MΩ

100kΩ
~1MΩ

Shield wire

R

1

R

2

V

RV

+

−

10µF

10µF

+

5V

V

IN

=-5V

V'

OUT

=-20V

V

OUT

=-10V

V'

reg

=-15V

V'

DD

=VIN=-15V

1
2
3
4
5

6
7

14
13
12

11
10

9
8

1
2
3
4
5

6
7

14
13
12

11
10

9
8

1MΩ

100kΩ

−

10µF

+

−

10µF

+

−

=VIN'

+−

10µF

+−

~

1MΩ

10µF

+

−

Serial Connection

● Temperature Gradient Assignment

1(VDD)

1
1
1
0(V

IN

)
0
0
0

P

off

L(V

OUT

)
L
H(V

DD

)
H
L
L
H
H

TC2

-0.4%/°C

-0.1%/°C

-0.6%/°C

-0.6%/°C

-

-

-

-

Temp. Gradient

ON
ON
ON
ON
OFF(Hi-Z)
OFF(Hi-Z)
OFF(Hi-Z)
OFF(Hi-Z)

V

reg

Output

ON
ON
ON
OFF
OFF
OFF
OFF
ON

CR oscillation

Cascade connection

Without regulation

Remarks

L(V

OUT

)

H(V

DD

)
L
H
L
H
L
H

TC1

Parallel Connection

5V

V

IN

=-5V

V

OUT

=-15V

V

reg

=-10V

C

4

10µF

C

3

10µF

1
2
3
4
5

6
7

14
13
12

11
10

9
8

1
2
3
4
5

6
7

14
13
12

11
10

9
8

R

OSC

C

1

C

2

10µF

10µF

+

−

+

−

+

−

C

1

C

2

10µF

10

µ

F

+

−

+

−

+

−

1MΩ

R

OSC

1MΩ

100kΩ
~1MΩ

R

RV

■ BASIC EXTERNAL CONNECTION

● Voltage Doubler and Tripler

A doubled voltage can be obtained at V

OUT

(CAP2-)
by disconnecting capacitor C2 from the tripler
configuration and shorting CAP2-- (pin4) and V

OUT

(pin 8).

● Voltage Tripler+Regulator
V

reg

output is given a temperature gradient, after

boosted output V

OUT

regulated. In this connection,

both V

OUT

and V

reg

can be taken out at the same

time.

● Parallel Connection

Parallel connection of n circuits can reduce R

OUT

to about

1/n, that output impedance R

OUT

can be reduced by
connecting serial configuraiton. A single smoothing
capacitor C3 can be used commonly for all parallely
connected circuit.
In parallely connection, a regulated output can be
obtained by applying the regulation circuit to only one of
the n parallely connected circuit.

● Cascade Connection

Cascade connection of SCI7661C/M (by connecting VIN and V

OUT

of one stage to VDD and VIN respectively of
the next stage) further increase the output voltage. Note, however, that the serial connection increases the
output impedance.

NOTE: The potential at Low level is different between the P

off

pin and the TC1/TC2 pin.

7

SCI7661C

OA

/M

OA

5V

V

IN

=

-5V

V

DD

=0V

V

OUT

=8.2V

C

1

10µF

C

2

10µF

C

3

10µF

1
2

3
4
5
6

7

14
13

12

11

10

9
8

R

OSC

+−

+−

+−

D

1

D

2

D

3

1MΩ

Positive Voltage Conversion D1, D2, D3,: Shottky
diodes with small V

F

are recommended.

5V

V

IN

=

-5V

V

OUT2

=

8.2V

V

DD

=0V

V

OUT1

=-15V

V

OUT1

=-10V

V

OUT2

=13.2V

V

DD

=5V

V

DD

=0V

10µF

10µF

10µF

10µF

1
2
3
4
5
6
7

14
13
12
11
10

9
8

++−

−

++−

+−

10µF

+−

−

1MΩ

Negative Voltage Convertion +Positive Voltage Conversion

1
2
3
4
5

6
7

14
13
12
11
10

9
8

10µF

+

−

R

1

R

RV

R

P

R

T

V

reg

V

DD

Example of Change of Temperature Gradient

Plastic DIP-14pin

Unit: mm

(inch)

14 8

17

19.7

max

(

0.775

max

)

19

±0.1

(

0.748

±0.003

)

6.3

±0.1

(

0.248

±0.003

)

1.5

(

0.059

)

0.46

±0.1

(

0.018

)

+0.004
–0.003

2.54

(

0.1

)

0°

15°

7.62

(

0.3

)

0.25

(

0.01

)

+0.001
–0

+0.03
–0.01

0.8

±0.1

(

0.031

)

+0.004

–0.003

3

min

(

0.119

min

)

4.4

±0.1

(

0.173

)

+0.004

–0.003

■ PACKAGE DIMENSIONS

● Positive Voltage Conversion

The input voltage can be doubled or tripled toward the positive
side. (In the doubler configuration, capacitor C2 and diode D

3

are disconnected and the diode D3 shorted at the both ends.)
In this case, however, the output voltage decrease by VF (forward
voltage)
For example VDD=0V, VIN=–5V and VF=0.6V, then V

OUT

=10V–

3×0.6V=8.2 V (if doubled, 5V–2×0.6V=3.8V)

● Negative Voltage Conversion + Positive
Voltage Conversion

This circuit produces outputs of –15V and +8.2V from
the –5V input. Note that this configuration causes
higher output impedance than in a single function
(negative or positive voltage converter).

● Changing the Temperature Gradient through Use of External
Temperature Sensor (Thermistor)

The SCI7661C/M has a temperature gradient selector circuit in its
regulator. It selects any one of the three gradients: –0.1% / °C, –0.4% /
°C and –0.6% / °C. It is necessary that the temperature gradient can be
changed to any other value by connecting a thermistor in series to the
output voltage control resistor RRV.

8

SCI7661C

OA

/M

OA

Plastic SOP5-14pin

Unit: mm

(inch)

814

71

INDEX

1.27

±0.1

(

0.05

±0.003

)

10.2

±0.2

(

0.402

)

5.5

±0.2

(

0.217

)

+0.007

–0.008

0.4

±0.1

(

0.016

)

+0.003
–0.004

2.2

max

(

0.086

max

)

0.15

±0.1

(

0.006

)

+0.003
–0.004

0.4

(

0.016

)

+0.007
–0.008

8

±0.3

(

0.315

±0.011

)

2.3

(

0.09

)

1.25

(

0.049

)

10.5

max

(

0.413

max

)

0.1

±0.08

(

0.004

±0.003

)

9

SCI7661C

OA

/M

OA

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Phone: [phone] Fax: [phone]

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