SCI7660

PF1097-01 SCI7660C /M SCI7660C0B/M0B 0B e ltag Voon de i Wiperat cts O odu Pr 0B DC-DC Converter q 95% Typical Power Efficiency q Doubled or Output Voltage q Voltage Conversion (Positive ⇔ Negative) s 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. s FEATURES q High performance with low power dissipation q Simple conversion of VDD(-5V) to +VI(+5V), -2VI(-10V) q Output current .......................... 30mA Max. (VDD = -5V) q Power conversion efficiency .... 95% Typ. q Cascade connection (two device connected VDD = -5V, VO = -15V) q Low power ................................ Ideal for dry cell battery q On-chip CR oscillator q Package ................................... DIP-8pin (plastic) SOP4-8pin (plastic) s BLOCK DIAGRAM CAP1+ VDD OSC1 OSC2 V1 CR Oscillator CAP1– Voltage Converter V0 s VOLTAGE RELATIONS VCC ................. VDD=0V (+5V) 1st side GND ................. V1=–5V (–5V) ................. V0=2V1=–10V 2nd side s PIN CONFIGURATION NC OSC2 OSC1 VDD 1 2 3 4 8 7 6 5 V1 V0 CAP1– CAP1+ s PIN DESCRIPTION Pin Name Pin No. OSC1 OSC2 VDD CAP1+ CAP1– VO VI 3 2 4 5 6 7 8 Function Oscillation resister connection terminal Power supply terminal (positive, system supply VCC) Terminal for connection of capacitor for booster (positive) Terminal for connection of capacitor for booster (negative) Output terminal at doubling Power supply terminal (negative, system supply GND) 1 SCI7660C0B/M0B s ABSOLUTE MAXIMAM RATINGS Rating Input voltage Output voltage Power dissipation Operating temperature Storage temperature Soldering temperature and time 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) (Ta = 25°C) 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. s 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 Condition Min. -8.0 -16.0 – – – 90 – 16 (VI = -5V, Ta = -40 to 85°C) Typ. – – 20 – 75 95 – 20 Max. -1.5 – 30 2.0 100 – 2.0 24 Unit V V µA µA Ω % µA kHz RL = ∞, ROSC = 1MΩ, VI = -5V RL = ∞, VI = -8V IO = 10mA, VI = -5V IO = 5mA, VI = -5V OSC1 terminal, VI = -8V ROSC = 1MΩ, VI = -5V s RECOMMENDED OPERATING CONDITIONS Condition Booster start voltage Symbol VSTA1 Remark ROSC = 1MΩ, CL/C2 ≤ 1/20*1 C2 ≥ 10µF Ta = -20 to 85°C ROSC = 1MΩ ROSC = 1MΩ Min. – – -1.5 RL Min.*2 – 10 680 3.3 Typ. – – – – – – – – (Ta = -40 to 85°C) Max. -1.5 -2.2 – – 30 30 2000 – Unit V V V Ω mA kHz kΩ µF 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 Notes: *1: Recommended circuity in low voltage operation is shown below. *2: RL Min. depends on input voltage as shown below. 2 SCI7660C0B/M0B Recommended circuit in low voltage operation *D1 1MΩ 1 2 3 4 8 7 6 5 + – RL CL C2=22µF – + C1=10µF *D1(VF(IF=1mA)≤0.6V) s CIRCUIT DESCRIPTION q C-R Oscillator The SCI7660C0B/M0B contains a C-R oscillator for internal oscillation. It consists of an external resistor ROSC connected between the OSC1 pin and OSC2 pin. q Voltage Converters OSC2 C-R Oscillation OSC1 Rosc OSC2 OSC1 External Clock 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. 5V 1 1MΩ 2 V1= – 5V 3 4 7 6 C1 5 8 C2 10µF VCC (+5V) GND (–5V) 10µF V0 = – 10V (2V1) VDD=0V V1= – 5V V0=2V1= – 10V Typical doubled voltage relations 3 SCI7660C0B/M0B s BASIC EXTERNAL CONNECTION q Parallel Connection (Output impedance can be reduced by parallel connections.) 5V 1 1MΩ 2 3 4 10µF 8 C2 7 6 C1 5 + – 1 1MΩ 2 3 4 8 7 6 C1 5 – + VI= – 5V – + 10µF 10µF VO = – 10V Parallel Connection q Positive Voltage Conversion (Input voltage can be doubled toward the positive side with diode.) VDD=0V 5V 1 1MΩ VI= – 5V 3 4 2 C2 8 7 6 5 C1 – + – 10µF + 10µF VO= 3.8V Positive Voltage Conversion q 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) 10µF 1 1MΩ 2 3 4 8 C2 7 6 5 C1 + – VI= – 5V 1 1MΩ 2 3 4 8 7 6 5 C2 – 10µF – + VI (–5V) VO(–10V) VDD' V I' VO' (–15V) 1st side 2nd side – + 10µF VO = – 10V=VI' C1 + 10µF VO ' = – 15V Cascade Connection 4 SCI7660C0B/M0B q 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 1 1MΩ VI= – 5V 3 4 6 C1 5 2 8 C2 7 + – C4 10µF 10µF –+ VDD = 0V VI = – 5V VO1=–10V – 10µF – + + VO1 = – 10V C3 10µF VO2=3.8V Negative Voltage Conversion+ Positive Voltage Conversion s PACKAGE DIMENSIONS Plastic DIP-8pin Plastic SOP4-8pin (0.197 –0.008 ) (0.381max) (0.358 –0.007 ) 8 5 0.2 9.1±+0.008 5±0.2 +0.007 9.7max 8 5 (0.197 –0.008 ) INDEX (0.252±0.007) INDEX 1 4 1.5 (0.059) 1 4 (0.123min) (0.181max) (0.016min) (0.148) 4.6max 0.4min 3.75 (0.006) (0.063) 1.75 (0.069) (0.268 –0.016 ) 5±0.2 +0.007 6.4±0.2 0.4 6.8±+0.015 1.6 3.1min (0.006 –0.004) (0.022) (0.035) 0.9 0.55 ±0.1 0.15+0.003 2.54 (0.1) ±0.1 0.46+0.004 (0.018 –0.003 ) (0. 0° 15° 7.62 (0.3) (0.05) (0.014 –0.004 ) Unit : mm (inch) 0.15 +0.03 0.01 0.25 – .001 +0 01 –0 ) 1.27 ±0.1 0.35+0.003 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 ED International Marketing Department II (ASIA) 421-8 Hino, Hino-shi, Tokyo 191-8501, JAPAN Phone: 042–587–5814 FAX: 042–587–5110 s Electronic devices information on the Epson WWW server. http://www.epson.co.jp/device/ 6 First issue February, 2000 Printed in Japan H