EPSON SCI7660

PF1097-01
SCI7660C
SCI7660C
0B/M/M
0B
0B
0B
DC-DC Converter
age
oltn
V
de io
Wiperat cts
O odu
Pr
● 95% Typical Power Efficiency
● Doubled or Output Voltage
● Voltage Conversion (Positive ⇔ Negative)
■ DESCRIPTION
The SCI7660C0B/M0B CMOS DC-DC Converter features high operational performance with low power dissipation. The booster generates a doubled output voltage from the input.
It is possible to drive the LSI that need another power supply than main power supply. (LCD drivers•Analog LSI
etc.) Its very low power requirement makes it ideal to supply handy equipments with power.
■ FEATURES
■ BLOCK DIAGRAM
● High performance with low power dissipation
● Simple conversion of VDD(-5V) to +VI(+5V), -2VI(-10V)
● Output current .......................... 30mA Max. (VDD = -5V)
● Power conversion efficiency .... 95% Typ.
CAP1+
VDD
OSC1
OSC2
● Cascade connection
CAP1–
(two device connected VDD = -5V, VO = -15V)
● Low power ................................ Ideal for dry cell battery
CR Oscillator
Voltage Converter
V1
V0
● On-chip CR oscillator
● Package ................................... DIP-8pin (plastic)
SOP4-8pin (plastic)
■ VOLTAGE RELATIONS
VCC ................. VDD=0V
(+5V)
1st side
GND ................. V1=–5V
2nd side
(–5V) ................. V0=2V1=–10V
■ PIN CONFIGURATION
■ PIN DESCRIPTION
Pin Name Pin No.
Function
NC
1
8
V1
OSC1
3
OSC2
2
7
V0
OSC2
2
OSC1
3
6
CAP1–
VDD
4
VDD
4
5
CAP1+
CAP1+
5
Terminal for connection of capacitor for booster (positive)
CAP1–
6
Terminal for connection of capacitor for booster (negative)
VO
7
Output terminal at doubling
VI
8
Power supply terminal (negative, system supply GND)
Oscillation resister connection terminal
Power supply terminal (positive, system supply VCC)
1
SCI7660C0B/M0B
■ ABSOLUTE MAXIMAM RATINGS
Rating
Input voltage
Output voltage
Power dissipation
Operating temperature
Storage temperature
Soldering temperature and time
(Ta = 25°C)
Symbol
VI
VO
PD
Topr
Tstg
Tsol
Value
-10.0 to 0.5
Min. -20.0
300 (DIP-8pin) / 150 (SOP4-8pin)
-40 to 85
-65 to 150
260°C, 10s (at lead)
Unit
V
V
mW
°C
°C
–
Note: When this IC is soldered in the solder-reflow process, be sure to maintain the reflow furnace at the curve shown in “Fig.
3-5 Temperature Profile for Standard SMD Package (QFP, SOP, PLCC and etc.) of this DATA BOOK. And this IC can
not be exposed to high temperature of the solder dipping.
■ ELECTRICAL CHARACTERISTICS
Characteristic
Input voltage
Output voltage
Booster current consumption
Stationary current
Output impedamce
Booster power conversion efficiency
Input leakage current
Oscillation frequency
Symbol
VI
VO
Iopr
IQ
RO
Peff
ILI
fOSC
(VI = -5V, Ta = -40 to 85°C)
Condition
RL = ∞, ROSC = 1MΩ, VI = -5V
RL = ∞, VI = -8V
IO = 10mA, VI = -5V
IO = 5mA, VI = -5V
OSC1 terminal, VI = -8V
ROSC = 1MΩ, VI = -5V
Min.
-8.0
-16.0
–
–
–
90
–
16
Typ.
–
–
20
–
75
95
–
20
■ RECOMMENDED OPERATING CONDITIONS
Condition
Booster start voltage
Symbol
VSTA1
VSTA2
Booster stop voltage
VSTP
Output load resistance
RL
Output current
IO
Oscillation frequency
fOSC
External resistance for oscillation
ROSC
Capacitor for booster
C1,C2,C3
Remark
ROSC = 1MΩ, CL/C2 ≤ 1/20*1
C2 ≥ 10µF Ta = -20 to 85°C
ROSC = 1MΩ
ROSC = 1MΩ
2
Unit
V
V
µA
µA
Ω
%
µA
kHz
(Ta = -40 to 85°C)
Min.
Typ.
Max.
Unit
–
–
-1.5
V
–
-1.5
RL Min.*2
–
10
680
3.3
–
–
–
–
–
–
–
-2.2
–
–
30
30
2000
–
V
V
Ω
mA
kHz
kΩ
µF
Notes: *1: Recommended circuity in low voltage operation is shown below.
*2: RL Min. depends on input voltage as shown below.
Max.
-1.5
–
30
2.0
100
–
2.0
24
SCI7660C0B/M0B
Recommended circuit in low voltage operation
*D1
1MΩ
1
8
2
7
3
6
4
5
+
RL
CL
–
C2=22µF
–
+
C1=10µF
*D1(VF(IF=1mA)≤0.6V)
■ CIRCUIT DESCRIPTION
● C-R Oscillator
OSC1
The SCI7660C0B/M0B contains a C-R oscillator for
OSC1
External Clock
Rosc
internal oscillation. It consists of an external resistor
ROSC connected between the OSC1 pin and OSC2 pin.
● Voltage Converters
OSC2
OSC2
C-R Oscillation
Open
External Clock Operation
The voltage converters double the input supply voltage (VI) using clocks generated by the C-R oscillator.
A doubled voltage can be obtained with a booster capacitor between CAP+ and CAP–, and with a external
smoothing capacitor between VI and VO.
10µF
5V
1
8
2
7
VCC
(+5V)
VDD=0V
3
6
GND
V1= – 5V
4
5
(–5V)
V0=2V1= – 10V
C2
1MΩ
V1= – 5V
C1
10µF
V0 = – 10V
(2V1)
Typical doubled voltage relations
3
SCI7660C0B/M0B
■ BASIC EXTERNAL CONNECTION
● Parallel Connection (Output impedance can be reduced by parallel connections.)
10µF
5V
8
1
1MΩ
VI= – 5V
+
C2
2
7
3
6
–
+
C1
5
4
1MΩ
–
1
8
2
7
3
6
–
+
C1
5
4
10µF
10µF
VO = – 10V
Parallel Connection
● Positive Voltage Conversion (Input voltage can be doubled toward the positive side with diode.)
VDD=0V
C2
5V
1MΩ
1
8
2
7
3
6
4
5
VI= – 5V
10µF
–
C1 –
+
+
10µF
VO= 3.8V
Positive Voltage Conversion
● Cascade Connection (Cascade Connection of SCI7660C0B/M0B further increase the output voltage.
Note, however, that the cascade connection increase the output impedance.)
5V
VDD = VI =–5V
VDD (0V)
VI= – 5V
10µF
1
1MΩ
8
C2
2
7
3
6
4
5
C1
+
–
1MΩ
–
+
10µF
VO = –10V=VI'
1
8
2
7
3
6
4
5
+
C2 – 10µF
VDD'
VI (–5V)
VO(–10V)
VO' (–15V)
–
C1 +
10µF
V I'
1st side
2nd side
VO ' = –15V
Cascade Connection
4
SCI7660C0B/M0B
● Negative Voltage Conversion + Positive Voltage Conversion (This circuit produces outputs of
-10V and +3.8V from the -5V input by combination of voltage doubler circuit and positive voltage
conversion circuit.)
VDD=0V
VO2 = 3.8V
5V
C4 10µF
1
8
2
7
3
6
4
5
C2
1MΩ
VI= – 5V
+
–
10µF
VDD = 0V
– +
VI = –5V
VO1=–10V
C1
–
10µF – +
+
VO1 = –10V
C3 10µF
VO2=3.8V
Negative Voltage Conversion+
Positive Voltage Conversion
■ PACKAGE DIMENSIONS
Plastic DIP-8pin
Plastic SOP4-8pin
5±0.2
+0.007
(0.197 –0.008 )
9.7max
(0.381max)
8
9.1±0.2
+0.008
5
(0.358 –0.007 )
1
6.8±0.4
+0.015
4
4
2.54
(0.1)
±0.1
0.46+0.004
(0.018 –0.003 )
(0.
0°
15°
)
7.62
(0.3)
1.27
(0.05)
±0.1
0.35+0.003
(0.014 –0.004 )
1.75
(0.069)
+0.03
.01
0.25 –0
+0.001
01 –0
0.15
1.6
(0.006) (0.063)
3.75
0.4min
(0.148)
(0.016min)
1
3.1min
4.6max
5±0.2
+0.007
INDEX
1.5
(0.059)
(0.123min) (0.181max)
(0.197 –0.008 )
6.4±0.2
INDEX
(0.268 –0.016 )
5
(0.252±0.007)
8
±0.1
0.15+0.003
(0.006 –0.004)
0.55
(0.022)
0.9
(0.035)
Unit : mm
(inch)
Unit : mm
(inch)
5
SCI7660C0B/M0B
NOTICE:
No part of this material may be reproduced or duplicated in any form or by any means without the written permission of Seiko Epson. Seiko Epson
reserves the right to make changes to this material without notice. Seiko Epson does not assume any liability of any kind arising out of any
inaccuracies contained in this material or due to its application or use in any product or circuit and, further, there is no representation that this material
is applicable to products requiring high level reliability, such as, medical products. Moreover, no license to any intellectual property rights is granted
by implication or otherwise, and there is no representation or warranty that anything made in accordance with this material will be free from any
patent or copyright infringement of a third party. This material or portions thereof may contain technology or the subject relating to strategic products
under the control of the Foreign Exchange and Foreign Law of Japan and may require an export license from the Ministry of International Trade
and Industry or other approval from another government agency.
© Seiko Epson Corporation 2000 All right reserved.
All other product names mentioned herein are trademarks and/or registered trademarks of their respective companies.
ELECTRONIC DEVICES MARKETING DIVISION
IC Marketing & Engineering Group
ED International Marketing Department I (Europe, U.S.A)
421-8 Hino, Hino-shi, Tokyo 191-8501, JAPAN
Phone: 042–587–5812 FAX: 042–587–5564
■ Electronic devices information on the Epson WWW server.
http://www.epson.co.jp/device/
ED International Marketing Department II (ASIA)
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Phone: 042–587–5814 FAX: 042–587–5110
6
First issue February, 2000
Printed in Japan
H