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PF110-10
SCI7661COA/MOA
e ag olt n V w tio Lo pera cts O rodu P
DC-DC Converter
q 95% Typical Power Efficiency q Doubled or Tripled Output Voltage q Internal Voltage Regulator
s 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.
s FEATURES
q High performance with low power dissipation q Simple conversion of VIN (-5V) to |VIN| (+5V), 2 |VIN| (+10V), 2VIN (-10V) or 3VIN (-15V) q On-chip output voltage regulator q Power conversion efficiency-Typ. 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 connection-two device connected: VIN=-5V, VOUT=-20V q On-chip C'-R oscillator q Package .................................... SCI7661C0A: DIP-14pin (plastic) SCI7661M0A: SOP5-14pin (plastic) SCI7661MAA: SSOP2-16pin (plastic)
s BLOCK DIAGRAM
VDD CR Oscillator
Temperature Gradient Select Circuit
OSC1 OSC2 VIN CAP1- CAP1+ CAP2- CAP2+
Reference Voltage Generator
Voltage Regulator
TC1 TC2
T
Voltage Converter (I)
Voltage Converter (II)
Poff RV Vreg Vout
Booster
Regurator
SCI7661COA/MOA
s PIN CONFIGURATION
CAP1+ CAP1CAP2+ CAP2TC1 TC2 VIN 1 2 3 4 5 6 7 14 13 12 11 10 9 8 VDD OSC1 OSC2 Poff RV Vreg Vout
s PIN DESCRIPTION
Pin name CAP1+, CAP1CAP2+, CAP2TC1, TC2 VIN VOUT Vreg RV Poff OSC2, OSC1 VDD 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) 8 Output terminal at tripling 9 Regulated voltage output terminal 10 Regulated voltage control terminal 11 Vreg output ON/OFF control terminal 12, 13 Oscillation resistor connection terminal 14 Power supply terminal(positive system supply VCC) No. 1, 2 3, 4 5, 6 7 Function
The same pin configuration in DIP and SOP
s ABSOLUTE MAXIMUM RATINGS
Rating Input supply voltage Input terminal voltage Output voltage Allowable loss Operating temperature Storage temperature Soldering temperature and time Symbol VI VI VO Pd Topr Tstg Tsol -30 -55 Min. -20/N VIN-0.5 VOUT-0.5 -20.0 Max. 0.5 0.5 0.5 300 85 150 Unit V V V V mW C C -
(VDD=0V) Remark
N=2 : Doubler N=3 : Tripler
OSC1, Poff TC1, TC2, RV
Plastic package
260C, 10s(at lead)
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.
s ELECTRICAL CHARACTERISTICS
(VDD = 0V, VIN=-5V, Ta=-30 to 85C) Characteristic Input supply voltage Output voltage Vreg Regulator operating voltage Booster current consumption Regulator current consumption Stationary current Oscillation frequency Output impedance Booster power conversion efficiency Regulated output voltage fluctuation VOUT Iopr1 Iopr2 IQ fosc ROUT Peff Vreg VOUT*Vreg 90 16 20 150 95 0.2 -18 -18.0 60 50 -2.6 -3.2 100 12.0 2.0 24 200 V V A A A kHz % %/V RL=, ROSC=1M RL=, RRV=1M VOUT=-15V TC2=TC1=VOUT, RL= ROSC=1M IOUT=10mA IOUT=5mA -18V2
SCI7661COA/MOA
Characteristic Regulated output load fluctuation Symbol Vreg IOUT Min. Typ. Max. Unit Condition VOUT=-15V, Vreg=-8V, Ta=25C 05
Regulated output saturation resistance
RSAT VRV0 VRV1 VRV2 CT0 CT4 CT2 IL -2.3 -1.7 -1.1 -0.25 -0.5 -0.7
5 -1.5 -1.3 -0.9 -0.1 -0.4 -0.6 -1.0 -1.1 -0.8 -0.06 -0.3 -0.5 2.0
V V V %/C %/C %/C A
Reference voltage
Temperature Gradient
Input leakage current
Poff, TC1, TC2, OSC1, RV pins
s RECOMMENDED OPERATING CONDITIONS
Condition Booster start voltage Booster stop voltage Output load resistance Output load current Oscillation frequency Extarnal resistance for oscillation Capasitor for booster Regulated output adjustable resistance Symbol VSTA1 VSTA2 VSTP RL IOUT fOSC ROSC C1, C2, C3 RRV 10 680 3.3 100 1000 RL -1.2 Min.*2 20 30 2000 Min. Max. -1.2 -2.2 Unit V V V mA kHz k F k
(Ta=-30 to 85C) Remark ROSC=1M, C310F*1 CL/C31/20, Ta=-20 to 85C ROSC=1M ROSC=1M
*1: Recommended circuity in low voltage operation is shown below.
(VIN=-1.2V ~ -2.2V)
*2: RL Min. depends on input voltage as shown below.
5
=C1=10F
2 +3 4 C2=10F 5 6 7
+-
+1 -
14 13 12 11 10 9 8
C3=22F
4
ROSC= 1M
VSTA2 VSTA1
RL
CL
RL Min.(k)
3 2 1 0 Double 0 1.5 2 3 4 56 VIN(V) Triple
D1(VF(IF=1mA))
0.6v
3
SCI7661COA/MOA
s PERFORMANCE CURVES
1000 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 -30 150 Ta=25C fOSC=40kHz VIN=-5V 100 VIN=-3V
Iopr1(A)
100
fOSC(kHz)
fOSC(kHz)
VIN=-5V VIN=-3V VIN=-1.5V
fOSC=20kHz
30 20 10
VIN=-1.5V
50
fOSC=10kHz 0 50 Ta(C) 100 150 0 1 2 3 4 5 VIN(V) 6 7
1 10K
100K
680K1M ROSC()
10M
Fig.1 Oscillation Frequency(fOSC)vs. External-Resistance(ROSC)
0 Ta=25C VIN=-5V
Fig.2 Oscillation Frequency(fOSC)vs. Temperature(Ta)
Fig.3 Input Voltage(VIN)vs. Booster Current Consumption(Iopr1)
400
0
VOUT(V) VOUT(V)
300
ROUT()
-5
-1 -2 -3 -4 -5
Ta=25C VIN=-5V Double
200
Triple
-10
Double Triple
Triple 0 1 2 3 4 5 6 7 8 9 10
100
Double
-6
IOUT(mA) -15 0 10 20 30 IOUT(mA) 40 50 0 0
Ta=25C 1 2 3 4 5 VIN(V) 6 7
Fig.4 Output Voltage(VOUT)vs. Output Current(IOUT)
100 90 80 70 Ta=25C VIN=-5.0V 60 50 40 30 20 10 0 0 10 20 30 IOUT(mA) 40 Double IIN Triple IIN Triple Peff 100 90 80 Double Peff 70
IIN(mA) Peff(%)
Fig.5 Output Voltage(VOUT)vs. Output Current(IOUT)
100 90 80 70 60 50 40 30 20 10 0 012 34 5 67 8 Triple IIN Double IIN Ta=25C VIN=-2.0V Triple Peff Double Peff 40 36 32 28
IIN(mA) Peff(%)
Fig.6 Output Inpedance(ROUT)vs. Input Voltage(VIN)
100 IOUT= 2mA 90 IOUT= 5mA 80 IOUT=10mA 70 60 I OUT=20mA 50 40 30 VIN=-5.0V 20 10 0 103 104 fOSC(Hz) 105 106 IOUT=30mA
Peff(%)
60 50 40 30 20 10 0 50
24 20 16 12 8 4 0 9 10
IOUT(mA)
Fig.7 Power Conversion Efficiency (Peff)/Input Current(IIN)vs. Output Current(IOUT)
100 90 IOUT= 0.5mA IOUT= 80 1mA IOUT= 2mA 70 60 50 40 30 20 10 03 10 104 fOSC(Hz) 105 106 -7.900 VIN=-1.5V IOUT=4mA -8.000
Fig.8 Power Conversion Efficiency (Peff)/Input Current(IIN)vs. Output Current(IOUT)
Fig.9 Power Conversion Efficiency (Peff)vs. Oscillation Frequency (fOSC)
-3.000
Peff(%)
-7.950
Vreg(V)
VOUT=-15V Ta=25C
-2.950
Vreg(V)
VOUT=-6V Ta=25C
-2.900
-7.850 10-4
10-3 IOUT(A)
10-2
10-1
-2.850 10-4
10-3 IOUT(A)
10-2
10-1
Fig.10 Power Conversion Efficiency(Peff) vs.Oscillation Frequency(fOSC)
Fig.11 Output Voltage(Vreg)vs. Output Current(IOUT)
Fig.12 Output Voltage(Vreg)vs. Output Current(IOUT)
4
SCI7661COA/MOA
0.30
0.25 VOUT= -5V
(V)
0.20 VOUT= -10V
x100(%)
50
0.15
Vreg(Ta) | - | Vreg(25C) |
Vreg-VOUT
| Vreg(25C) |
0
0.10 VOUT= -15V
CT: -0.1%/C CT: -0.4%/C 0 Ta(C) 50 100 CT: -0.6%/C
0.05
-50 -50
0.00
0
5
10 IOUT(mA)
15
20
Fig:13 Regulated Output Saturation Resistance(RSAT)Vreg--VOUT --IOUT
Fig:14 Output Voltage(vreg)vs. Temperature(Ta)
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.
Osc1 ROSC Osc2 C-R Oscillation Osc2 Open Osc1 External Clock
External Clock Operation
q Voltage Converters The voltage converters doubleA^triple the input supply voltage (VIN) using clocks generated by the C-R oscillator
VDD=0V VDD=0V VIN=-5V GND (-5V) VIN=-5V CAP2=2VIN=-10V VOUT=3VIN=-15V Typical Doubled Voltage Relations Typical Tripled Voltage Relations
VCC (+5V)
qReference 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 Vreg output.
VDD Poff RV Vreg Voltage Regulator Control signal RRV = 100k to 1M
q Temperature Gradient Selector Circut The SCI7661C/M provides the Vreg output with a temperature gradient suitable for LCD driving.
5
SCI7661COA/MOA
q Temperature Gradient Assignment
Vreg Output Temp. Gradient CR oscillation TC1 TC2 Poff ON -0.4%/C ON 1(VDD) L(VOUT) L(VOUT) ON -0.1%/C ON 1 L H(VDD) ON -0.6%/C ON 1 H(VDD) L ON -0.6%/C OFF 1 H H OFF(Hi-Z) OFF 0(VIN) L L OFF(Hi-Z) OFF H L 0 OFF(Hi-Z) OFF L H 0 OFF(Hi-Z) ON H H 0 NOTE: The potential at Low level is different between the Poff pin and the TC1/TC2 pin. Remarks
Cascade connection
Without regulation
s BASIC EXTERNAL CONNECTION
q Voltage Doubler and Tripler A doubled voltage can be obtained at VOUT (CAP2-) by disconnecting capacitor C 2 from the tripler configuration and shorting CAP2- (pin4) and VOUT (pin 8).
C1 10F 5V C2 10F
+ - + -
q Voltage Tripler+Regulator Vreg output is given a temperature gradient, after boosted output VOUT regulated. In this connection, both VOUT and Vreg can be taken out at the same time.
1 2 3 4 5 6 7
+ -
14 13 12 11 10 9 8
ROSC 1M 5V
C1 10F C2 10F
+ - + -
1 2 3 4 5 6 7
+
VIN=-5V VOUT=-15V
VIN=-5V
14 R OSC R1 RRV+ C4 13 - 10F 12 R2 1M 100k 11 ~1M 10 Shield wire 9 Vreg=-8V= 8 VOUT=-15V RRV - R VRV
1
C3 10F
C3 10F
Voltage Tripler
Tripler+Regulator (-0.4%/C selected as temperature gradient)
q Parallel Connection
Parallel connection of n circuits can reduce ROUT 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.
5V C1 + 10F - C2 - 10F
+
1 2 3 4 5 6 7
14 13 ROSC 12 1M 11 10 9 8
+ -
C1 10F C2 10F
+ - + -
1 2 3 4 5 6 7
VIN=-5V C3 10F
14 C4 + 13 ROSC 10F - 12 RRV 1M 11 100k 10 ~1M 9 8 Vreg=-10V VOUT=-15V
Parallel Connection
q Cascade Connection
Cascade connection of SCI7661C/M (by connecting VIN and VOUT 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.
V'DD=VIN=-15V 10F
+ -
5V
1 2 3 4 5 6 7
14 13 12 11 10
10F 1M 10F
+ -
+ -
1 2 3 4 5 6 7
14 13 12 11 10 9 8 V'OUT=-20V
+
100k 1M
-
10F
9 VOUT=-10V =VIN' 8
+ -
~
V'reg=-15V
VIN=-5V
10F
+ -
10F
Serial Connection
6
SCI7661COA/MOA
q Positive Voltage Conversion The input voltage can be doubled or tripled toward the positive side. (In the doubler configuration, capacitor C2 and diode D3 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 VOUT=10V- 3x0.6V=8.2 V (if doubled, 5V-2x0.6V=3.8V)
VDD=0V D1 D2
C1 10F +- C2 10F +-
1 2 3 4
14 13 12 11 10 9 8 ROSC 1M
5V D3 C3 10F +-
5 6 7
VOUT=8.2V VIN= -5V
Positive Voltage Conversion D1, D2, D3,: Shottky diodes with small VF are recommended.
q 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).
VDD=0V
10F
+
VOUT2=13.2V
+ - + -
-
10F
+
-
5V VOUT2= 8.2V VIN= -5V
10F 10F
+
-
1 2 3 4 5 6 7
+ -
14 VDD=5V 13 1M 12 VDD=0V 11 10 9 VOUT1=-15V 8
VOUT1=-10V
10F
Negative Voltage Convertion +Positive Voltage Conversion
q Changing the Temperature Gradient through Use of External
1 14 13 12 + - 11 10 9 8 Vreg 10F R1 RRV
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.
VDD
2 3 4 5 6 7
RT
RP
Example of Change of Temperature Gradient
s PACKAGE DIMENSIONS
Plastic DIP-14pin
(0.775max) (0.7480.003)
14 8 190.1 19.7max
1
7
(0.119min) (0.173 -0.003 )
3min
(0.031 -0.003 )
(0.059)
4.40.1 +0.004
1.5
0.80.1 +0.004
(0.2480.003)
6.30.1
(0.1)
2.54
(0.018 -0.003 )
0.1 0.46+0.004
0 15
(0.3)
7.62
(0.01 -0
0.25 -0 .001 +0
+0.03 .01
)
Unit: mm (inch)
7
SCI7661COA/MOA
Plastic SOP5-14pin
(0.413max) (0.402 -0.008 )
14 8
0.2 10.2+0.007
10.5max
(0.217 -0.008 )
INDEX
(0.086max) (0.09)
1
7
2.2max
(0.3150.011)
5.50.2 +0.007
80.3
2.3
(0.006 -0.004) (0.016) (0.049)
1.25 0.4
0.1 0.15+0.003
(0.016 -0.004 )
0.10.08
(0.050.003)
(0.0040.003)
1.270.1
0.40.1 +0.003
Unit: mm (inch)
8
SCI7661COA/MOA
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 Trade Control Law of Japan and may require an export license from the Ministry of International Trade and Industry or other approval from another government agency. All product names mentioned herein are trademarks and/or registered trademarks of their respective companies. (c)Seiko Epson Corporation 1998 All rights reserved.
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