● Doubled or Tripled Output Voltage

SCI7661C ^OA /M ^OA

1

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), 2VIN (–10V) or 3VIN (–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, VOUT=–20V

● On-chip C'–R oscillator

● Package ... SCI7661C0A: DIP-14pin (plastic) SCI7661M0A: SOP5-14pin (plastic) SCI7661MAA: SSOP2-16pin (plastic)

■ BLOCK DIAGRAM

Operation Products

T

V_DD

V_IN CAP1 |

CAP2 | CAP1 {

CAP2 { OSC1 OSC2

CR Oscillator

Voltage Converter

i I j

Voltage Converter

i II j

Reference Voltage Generator Voltage Regulator Temperature Gradient Select Circuit

TC1 TC2

P_off V_reg V_out RV

Booster Regurator

■ ELECTRICAL CHARACTERISTICS

■ ABSOLUTE MAXIMUM RATINGS

CAP2 { CAP1 | CAP2 | TC1 TC2 V_IN

3 2 4 5 6 7

P_off V_reg V_out OSC1 OSC2 RV 11

9 8 13 12 10

The same pin configuration in DIP and SOP

TC1, TC2 V_IN V_OUT Vreg R_V P_off

OSC2 COSC1 V_DD

5, 6 7 8 9 10 11 12, 13

14

Temperature gradient selection terminal

Power supply terminalinegative, system supply GND j

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 ipositive system supply VCC j

Characteristic Symbol Min. Typ. Max. Unit Condition

iV_DD 0V, V_IN |5V, Ta |30 to 85

V

R_L , R_RV 1M ¶, V_O |18V

R_L , R_OSC 1M ¶ R_L , R_RV 1M ¶ V_OUT |15V 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 Iopr₁

|18.0 60 50

20 150

|3.2 100

V

˚A

|18

Vreg |2.6 V

Iopr₂ 12.0 ˚A

I_OUT 5mA 95

Peff 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

Stationary current Oscillation frequency Output impedance

VI

Input terminal voltage OSC1, Poff

TC1, TC2, RV

Plastic package

Rating Symbol Remark

V V Unit

0.5 0.5 Max.

V_IN |0.5 V_OUT |0.5 VO

Pd

Topr

T_stg T_sol Output voltage

Allowable loss Operating temperature Storage temperature

Soldering temperature and time

V mW

\ 300

85 150

|20.0

|30

|55 VI

Input supply voltage |20^N 0.5 V

Min.

iVDD 0V j

260 , 10s iat lead j

N 2 FDoubler N 3 FTripler

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.

SCI7661C ^OA /M ^OA

■ RECOMMENDED OPERATING CONDITIONS

iV_IN |1.2V ‘ |2.2V j

C₁ 10˚F

C₂ 10˚F {

|

{

{ |

|

1 2 3 4 5 6 7

14 13 12 11 10 9 8

R_OSC

1M¶ R_L C_L

C3 22 ˚F D1iVFiIF 1mA j0.6v

5

4

3

2

1

0

0 1.5 2 3 4 5 6 V_STA2 V_STA1

V_IN iV j Triple Double

RL Min.ik¶j

Characteristic Symbol Min. Typ. Max. Unit Condition

¢V_reg

¢I_OUT

bV_regi50 jb | bV_regi0 jb 50 |0

CT

1 bV_regi25 jb

~ ~100

V_OUT |15V, V_reg |8V, Ta 25

0 I_OUT 10mA, TC1 V_DD TC2 V_OUT

R_SAT ¢iVreg |V_OUT^j¢I_OUT 0 I_OUT 10mA, RV V_DD, Ta 25

TC2 V_OUT, TC1 V_DD, Ta 25 TC2 TC1 V_OUT, Ta 25 TC2 V_DD CTC1 V_OUT, Ta 25

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

^

^

^

|0.1

|0.4

|0.6

|0.06

|0.3

|0.5

|0.25

|0.5

|0.7 CT⁰

CT⁴ CT²

˚A 2.0

I_L Regulated output load

fluctuation

Regulated output saturation resistance

Reference voltage

Temperature Gradient

Input leakage current

Condition Symbol Min. Max. Unit Remark

iTa |30 to 85 R_OSC 1M ¶ CC₃ 10 ˚F ¹ C_L^C₃ 1/20 CTa |20 to 85 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

C₁, C₂, C₃

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.

fOSCikHzj Iopr1i˚Aj

fOSCikHzj PeffijPeffij VregiVj

IINimAj IINimAj

Peffij Peffij

VOUTiVj ROUTi¶j

ROSCi ¶ j

IOUTimA j

IOUTimAj IOUTimAj fOSCiHzj

IOUTimAj

VIN iVj

VOUTiVj

0

100 90 80 70 60 50 40 30 20 10 0

100 90 80 70 60 50 40 30 20

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

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 20 30 40 50 0 1 2 3 4 5 6 7 8 910 10³ 10⁴ 10⁵ 10⁶

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

VIN |5V VIN |3V

VIN |3V VIN |1.5V

VIN |1.5V

VINiVj 100

50

Ta 25Åé

V_IN |5.0V Ta {25

V_IN |2.0V Ta {25

V_OUT |15V Ta 25

V_OUT |6V Ta 25 VIN |5V

Ta {25

Ta 25

fOSC 20kHz

OSC 10kHz

Tai j Fig.1 Oscillation Frequencyif_OSCvs.j

External-ResistanceiR_OSC j

Fig.4 Output VoltageiV_OUT vs.j Output CurrentiI_OUT j

Fig.7 Power Conversion Efficiency iP_eff/Input Currentj iI_IN vs.j Output Current iI_OUT j

Fig.8 Power Conversion Efficiency iP_eff/Input Currentj iI_IN vs.j Output Current iI_OUT j

Fig.9 Power Conversion Efficiency iP_eff vs. Oscillation Frequencyj if_OSC j

Fig.5 Output VoltageiV_OUT vs.j Output CurrentiI_OUT j

Fig.6 Output InpedanceiR_OUT vs.j Input VoltageiV_IN j Fig.2 Oscillation Frequencyif_OSCvs.j

TemperatureiTa j

Fig.3 Input VoltageiV_IN vs. Boosterj Current ConsumptioniI_opr1 j

Double

Double Peff

Double Peff

Double IIN Double IIN

Double

Double Triple

Triple Peff

Triple Peff

Triple

Triple

Triple

IIN Triple I_IN

VIN |5.0V

VIN |1.5V

IOUT 10mA

IOUT 4mA

IOUT 20mA IOUT 30mA IOUT

5mA IOUT

2mA

IOUT

0.5mA IOUT

1mA IOUT

2mA

|8.000

|7.950

|7.900

VregiVj

|3.000

|2.950

|2.900

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 ROSC

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 Vreg output.

● Temperature Gradient Selector Circut

The SCI7661C/M provides the V_reg output with a temperature gradient suitable for LCD driving.

(between VDD and Vreg)

0.30

0.25

50

0

|50 0.20

0.15

0.10

0.05

0.00

VOUT

|5V

V_OUT |10V

CTF

|0.1 ^ CTF

|0.4 ^ C_TF

|0.6 ^ VOUT

|15V

IOUTimA j

Tai j VregiTajb|bVregi25jb

0

|50 0 50 100

5 10 15 20

Vreg|VOUTiVj ~100ij bVregi25jb

Fig:13 Regulated Output Saturation ResistanceiR_SAT jV_reg |V_OUT |I_OUT

Fig:14 Output Voltageiv_reg vs.j TemperatureiTa j

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 i {5V j

i |5V j 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 ¶

5V

V_IN |5V V_OUT |15V

C1

C₂

C₃ 10 ˚F 10 ˚F

10 ˚F 1 2 3 4 5 6 7

14 13 12 11 10 9 8

R_OSC 1M ¶

Voltage Tripler

{

{

| {

|

|

5V

V_IN |5V

VOUT |15V

V_reg |8V C₁

C₄

R_RV R₁ RRV C2

C₃ 10 ˚F

10 ˚F 10 ˚F

10 ˚F 1 2 3 4 5 6 7

14 13 12 11 10 9 8

R_OSC

Tripler {Regulator

i |0.4 ^ selected as temperature gradient j

{

{

| {

|

|

1M¶ _100k¶

‘1M¶

Shield wire R1

R2

V_RV

{

|

10˚F

{

5V

V_DD V_IN |15V

1 2 3 4 5

14 13 12 11 10

1 2 3 4 5

14 13 12 11 10 1M¶

100k¶

| 10 ˚F^{_|

10 ˚F^{_| ‘

1M¶ 10˚F

{

|

1 1

0 iV_IN j 0

0 0

H iV_DD j H

L L H H

|0.6 /

|0.6 /

\

\

\

\

ON ON

OFF iHi-Z j OFF iHi-Z j OFF iHi-Z j OFF iHi-Z j

ON OFF OFF OFF OFF ON

Cascade connection

Without regulation L

H L H L H

Parallel Connection

5V

VIN |5V V_OUT |15VVreg |10V

C₄ 10 ˚F

C310˚F 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

C₁ C₂ 10˚F 10˚F

{

|

{

| {

|

C1

C₂ 10 ˚F 10 ˚F

{

| {

{ |

1M¶ |

ROSC

1M¶

100k¶

‘1M¶ R_RV

■ BASIC EXTERNAL CONNECTION

● Voltage Doubler and Tripler

A doubled voltage can be obtained at VOUT(CAP2-) by disconnecting capacitor C2 from the tripler configuration and shorting CAP2-- (pin4) and VOUT

(pin 8).

● 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.

●

Parallel connection of n circuits can reduce ROUT to about 1Å^n, that output impedance ROUT 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 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.

NOTE: The potential at Low level is different between the P_off pin and the TC1/TC2 pin.

SCI7661C ^OA /M ^OA

5V

V_IN |5V V_DD 0V

V_OUT 8.2V C₁10˚F

C₂10˚F

C₃10˚F 1 2 3 4 5 6 7

14 13 12 11 10 9 8

ROSC { |

{ |

{ |

D₁ D2

D3

1M¶

Positive Voltage Conversion @D1, D2, D3,: Shottky diodes with small V_F are recommended.

5V

V_IN

|5V

VOUT2

8.2V V_DD 0V

V_OUT1 |15V V_OUT1 |10V V_OUT2 13.2V V_DD 5V

V_DD 0V 10˚F

10˚F 10˚F 10˚F

1 2 3 4 5 6 7

14 13 12 11 10 9 8

{ {

|

| {

{

|

{ |

10˚F

{ |

|

1M¶

Negative Voltage Convertion {Positive Voltage Conversion

1 2 3 4 5 6 7

14 13 12 11 10 9 8

10˚F {

| R₁

R_RV

RP

RT

Vreg

V_DD

Example of Change of Temperature Gradient

Plastic DIP-14pin

Unit: mm iinch j

14 8

1 7

19.7max

(0.775max) 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)

(2.540.1) 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

3min (0.119min)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 D3 are disconnected and the diode D3 shorted at the both ends.) In this case, however, the output voltage decrease by VFÅiforward voltageÅ.j

For example VDD=0V, VIN=–5V and VF=0.6V, then VOUT=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.

© Seiko Epson Corporation 1997 All right reserved.

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.

Plastic SOP5-14pin

Unit: mm iinch j

8 14

7 1

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})

2.2max (0.086max)

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) 10.5max

(0.413max)

0.1±0.08 (0.004±0.003)

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