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| EVALUATION KIT AVAILABLE TC7662A CHARGE PUMP DC-TO-DC CONVERTER FEATURES s s s s s s s Wide Operating Range ............................. 3V to 18V Increased Output Current .............................. 40mA Pin Compatible with ICL7662/SI7661/TC7660/ LTC1044 No External Diodes Required Low Output Impedance @ IL = 20mA ....... 40 Typ. No Low-Voltage Terminal Required CMOS Construction GENERAL DESCRIPTION The TC7662A is a pin-compatible upgrade to the Industry standard TC7660 charge pump voltage converter. It converts a +3V to +18V input to a corresponding -3V to -18V output using only two low-cost capacitors, eliminating inductors and their associated cost, size and EMI. In addition to a wider power supply input range (3V to 18V versus 1.5V to 10V for the TC7660), the TC7662A can source output currents as high as 40mA. The on-board oscillator operates at a nominal frequency of 12kHz. Operation below 10kHz (for lower supply current applications) is also possible by connecting an external capacitor from OSC to ground. The TC7662A directly is recommended for designs requiring greater output current and/or lower input/output voltage drop. It is available in 8-pin PDIP, and CerDIP packages in commercial and extended temperature ranges. PIN CONFIGURATION PDIP/CerDIP NC 1 C+ 2 8 VDD 7 OSC ORDERING INFORMATION Part No. TC7662ACPA TC7662AEPA TC7662AIJA TC7662AMJA Package 8-Pin Plastic DIP 8-Pin Plastic DIP 8-Pin CerDIP 8-Pin CerDIP Temperature Range 0C to +70C - 40C to +85C - 25C to +85C - 55C to +125C GND 3 C- 4 TC7662A 6 NC 5 VOUT NC = NO INTERNAL CONNECTION FUNCTIONAL BLOCK DIAGRAM 8 I COSC 7 LEVEL SHIFT P SW1 2 CAP + TC7662A VDD + - Q F/F C Q COMPARATOR WITH HYSTERESIS VREF LEVEL SHIFT N SW4 + CP EXT GND 3 + LEVEL SHIFT OUT N SW2 4 - CR EXT CAP RL LEVEL SHIFT N SW3 5 VOUT (c) 2001 Microchip Technology Inc. DS21468 TC7662A-5 9/11/96 CHARGE PUMP DC-TO-DC CONVERTER TC7662A ABSOLUTE MAXIMUM RATINGS* Supply Voltage V DD to GND .................................... +18V Input Voltage (Any Pin) ........... (VDD + 0.3) to (V SS - 0.3) Current Into Any Pin ................................................. 10mA Operating Temperature Range C Suffix .................................................. 0C to +70C I Suffix .............................................. - 25C to +85C E Suffix ............................................. - 40C to +85C M Suffix .......................................... - 55C to +125C Power Dissipation (TA 70C) Plastic DIP ......................................................730mW CerDIP ...........................................................800mW SOIC ........................................................................... Package Thermal Resistance CPA, EPA JA .............................................. 140C/W IJA, MJA JA .................................................. 90C/W Storage Temperature Range ................ - 65C to +150C Lead Temperature (Soldering, 10 sec) ................. +300C ESD Protection ...................................................... 2000V Output Short Circuit ................. Continuous (at 5.5V Input) * Static-sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static fields. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to Absolute Maximum Rating Conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS: VDD = 15V, TA = +25C (See Test Circuit), unless otherwise specified. Symbol V DD IS Parameter Supply Voltage Supply Current Test Conditions RL = V DD = +15V 0C TA +70C - 55C TA +125C V DD = +5V 0C TA +70C - 55C TA +125C IL = 20mA, V DD = +15V IL = 40mA, V DD = +15V IL = 3mA, V DD = +5V V DD = +15V RL = 2 k VDD = +15V RL = Over Operating Temperature Range Min 3 -- -- -- -- -- -- -- -- -- -- 93 99 96 Typ -- 510 560 650 190 210 210 40 50 100 12 97 99.9 -- Max 18 700 -- -- -- -- -- 50 60 125 -- -- -- -- Unit V A RO Output Source Resistance Oscillator Frequency Power Efficiency Voltage Efficiency COSC PEFF VEFF kHz % % TC7662A-5 9/11/96 2 (c) 2001 Microchip Technology Inc. DS21468 CHARGE PUMP DC-TO-DC CONVERTER TC7662A TEST CIRCUIT EPR NC + 10 F 1 2 8 7 TC7662A 6 5 NC C OSC IS IL RL V+ (+5V) ESL ESR C CP 3 4 VOUT (-5V) CR + 10 F Figure 1. Capacitor Equivalent Circuit APPLICATIONS INFORMATION Theory of Operation The TC7662A is a capacitive charge pump (sometimes called a switched-capacitor circuit), where four MOSFET switches control the charge and discharge of a capacitor. The functional diagram (page 1) shows how the switching action works. SW1 and SW2 are turned on simultaneously, charging C1 to the supply voltage, VDD. This assumes that the ON resistance of the MOSFETs in series with the capacitor produce a charging time (3 time constants) less than the ON time provided by the oscillator frequency, as shown: 3 (RDS(ON) C1) where DS (duty cycle) = 50%. Thus, ZC 1.33 at f = 12kHz, where C = 10F. For the TC7662A, f = 12,000Hz, and a typical value of C would be 10F. This is a reactive impedance of 1.33. If the ESR is as great as 5, the reactive value is not as critical as it would first appear, since the ESR would dominate. The 5 value is typical of a general-purpose electrolytic capacitor. Synchronizing The TC7662A may be synchronized by connecting pin 7 of the TC7662A through a 100k resistor in series with a diode to a negative-going pulse source. The negative pulse voltage can be +5V with a 5 microsecond duration going negative to 0V. Q Capacitors In early charge pump converters, capacitors were not considered critical due to the high RDS(ON) of the MOSFET switches. In order to understand this, let's look at a model of a typical electrolytic capacitor (Figure 1). (c) 2001 Microchip Technology Inc. DS21468 TTL 100 k Q TO PIN 7 TC7662A Figure 2. 3 Synchronization TC7662A-5 9/11/96 CHARGE PUMP DC-TO-DC CONVERTER TC7662A TYPICAL APPLICATIONS Combined Negative Converter and Positive Multiplier V 1 2 CP2 + 10 F 3 4 CP1 + TC7662A 8 7 6 V = -V 5 OUT + C R2 10 F VD1 + + VD2 + + VOUT = 2V -2VD C R1 10 F Lowering Output Resistance by Paralleling Devices V+ 1 2 CP1 + 10 F 3 4 TC7662A 8 7 6 5 CP2 + 10 F 1 2 3 4 TC7662A 8 7 6 5 CR 10 F + VOUT Positive Voltage Multiplier V+ 1 2 3 4 TC7662A 8 7 6 5 + VD1 VD2 CP 10 F + VOUT = 2V+-2 VD CR 10 F Split V+ In Half V+ 1 2 CP + 10 F 3 4 TC7662A 8 7 6 5 V+ VOUT = 2 CR + 100 F TC7662A-5 9/11/96 4 (c) 2001 Microchip Technology Inc. DS21468 CHARGE PUMP DC-TO-DC CONVERTER TC7662A TYPICAL CHARACTERISTICS CURVES Supply Current vs Temperature 700 TA = +25C Oscillator Frequency vs CEXT 10k FREQUENCY (Hz) SUPPLY CURRENT (A) 600 500 400 300 200 100 0 -60 -40 -20 0 20 40 60 80 TEMPERATURE (C) 100 120 140 V + = 5V + V = 15V 1k 100 10 1 10 100 1000 CAPACITANCE (pF) 10,000 Frequency vs Temperature 20 OUTPUT RESISTANCE ( ) Output Resistance vs Temperature 160 140 120 100 80 60 40 20 -60 -40 -20 V+ = 15V, IL = 20 mA V + = 5V, IL = 3 mA 18 FREQUENCY (kHz) 16 14 12 10 8 6 -60 -40 -20 0 20 40 60 80 TEMPERATURE (C) 100 120 140 0 20 40 60 80 TEMPERATURE (C) 100 120 140 Power Conversion Efficiency vs I LOAD POWER CONVERSION EFFICIENCY (%) Output Resistance vs Input Voltage 165 150 OUTPUT RESISTANCE () 110 100 90 80 70 60 50 40 30 20 10 0 8 16 TA = +25C 110 100 SUPPLY CURRENT (mA) TA = +25C 135 EFFICIENCY 120 105 90 SUPPLY CURRENT 75 60 45 30 15 0 80 90 80 70 60 50 40 30 20 10 0 2 4 6 8 10 12 14 INPUT VOLTAGE (V) 16 18 20 20 mA 24 32 40 48 56 64 LOAD CURRENT (mA) DS21468 72 (c) 2001 Microchip Technology Inc. 5 TC7662A-5 9/11/96 CHARGE PUMP DC-TO-DC CONVERTER TC7662A PACKAGE DIMENSIONS 8-Pin Plastic DIP PIN 1 .260 (6.60) .240 (6.10) .045 (1.14) .030 (0.76) .400 (10.16) .348 (8.84) .200 (5.08) .140 (3.56) .150 (3.81) .115 (2.92) .070 (1.78) .040 (1.02) .310 (7.87) .290 (7.37) .040 (1.02) .020 (0.51) .015 (0.38) .008 (0.20) .400 (10.16) .310 (7.87) 3 MIN. .110 (2.79) .090 (2.29) .022 (0.56) .015 (0.38) 8-Pin CerDIP .110 (2.79) .090 (2.29) PIN 1 .300 (7.62) .230 (5.84) .055 (1.40) MAX. .400 (10.16) .370 (9.40) .200 (5.08) .160 (4.06) .200 (5.08) .125 (3.18) .020 (0.51) MIN. .320 (8.13) .290 (7.37) .040 (1.02) .020 (0.51) .015 (0.38) .008 (0.20) .400 (10.16) .320 (8.13) .065 (1.65) .020 (0.51) .045 (1.14) .016 (0.41) Dimensions: inches (mm) 6 (c) 2001 Microchip Technology Inc. DS21468 .150 (3.81) MIN. 3 MIN. TC7662A-5 9/11/96 CHARGE PUMP DC-TO-DC CONVERTER TC7662A WORLDWIDE SALES AND SERVICE AMERICAS Corporate Office 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: 480-792-7627 Web Address: http://www.microchip.com New York 150 Motor Parkway, Suite 202 Hauppauge, NY 11788 Tel: 631-273-5305 Fax: 631-273-5335 ASIA/PACIFIC (continued) Singapore Microchip Technology Singapore Pte Ltd. 200 Middle Road #07-02 Prime Centre Singapore, 188980 Tel: 65-334-8870 Fax: 65-334-8850 San Jose Microchip Technology Inc. 2107 North First Street, Suite 590 San Jose, CA 95131 Tel: 408-436-7950 Fax: 408-436-7955 Rocky Mountain 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7966 Fax: 480-792-7456 Taiwan Microchip Technology Taiwan 11F-3, No. 207 Tung Hua North Road Taipei, 105, Taiwan Tel: 886-2-2717-7175 Fax: 886-2-2545-0139 Toronto 6285 Northam Drive, Suite 108 Mississauga, Ontario L4V 1X5, Canada Tel: 905-673-0699 Fax: 905-673-6509 Atlanta 500 Sugar Mill Road, Suite 200B Atlanta, GA 30350 Tel: 770-640-0034 Fax: 770-640-0307 ASIA/PACIFIC China - Beijing Microchip Technology Beijing Office Unit 915 New China Hong Kong Manhattan Bldg. No. 6 Chaoyangmen Beidajie Beijing, 100027, No. China Tel: 86-10-85282100 Fax: 86-10-85282104 Austin Analog Product Sales 8303 MoPac Expressway North Suite A-201 Austin, TX 78759 Tel: 512-345-2030 Fax: 512-345-6085 EUROPE Australia Microchip Technology Australia Pty Ltd Suite 22, 41 Rawson Street Epping 2121, NSW Australia Tel: 61-2-9868-6733 Fax: 61-2-9868-6755 Boston 2 Lan Drive, Suite 120 Westford, MA 01886 Tel: 978-692-3848 Fax: 978-692-3821 China - Shanghai Microchip Technology Shanghai Office Room 701, Bldg. B Far East International Plaza No. 317 Xian Xia Road Shanghai, 200051 Tel: 86-21-6275-5700 Fax: 86-21-6275-5060 Denmark Microchip Technology Denmark ApS Regus Business Centre Lautrup hoj 1-3 Ballerup DK-2750 Denmark Tel: 45 4420 9895 Fax: 45 4420 9910 Boston Analog Product Sales Unit A-8-1 Millbrook Tarry Condominium 97 Lowell Road Concord, MA 01742 Tel: 978-371-6400 Fax: 978-371-0050 France Arizona Microchip Technology SARL Parc diActivite du Moulin de Massy 43 Rue du Saule Trapu Batiment A - ler Etage 91300 Massy, France Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79 Hong Kong Microchip Asia Pacific RM 2101, Tower 2, Metroplaza 223 Hing Fong Road Kwai Fong, N.T., Hong Kong Tel: 852-2401-1200 Fax: 852-2401-3431 Chicago 333 Pierce Road, Suite 180 Itasca, IL 60143 Tel: 630-285-0071 Fax: 630-285-0075 Dallas 4570 Westgrove Drive, Suite 160 Addison, TX 75001 Tel: 972-818-7423 Fax: 972-818-2924 India Microchip Technology Inc. India Liaison Office Divyasree Chambers 1 Floor, Wing A (A3/A4) No. 11, OiShaugnessey Road Bangalore, 560 025, India Tel: 91-80-2290061 Fax: 91-80-2290062 Germany Arizona Microchip Technology GmbH Gustav-Heinemann Ring 125 D-81739 Munich, Germany Tel: 49-89-627-144 0 Fax: 49-89-627-144-44 Dayton Two Prestige Place, Suite 130 Miamisburg, OH 45342 Tel: 937-291-1654 Fax: 937-291-9175 Germany Analog Product Sales Lochhamer Strasse 13 D-82152 Martinsried, Germany Tel: 49-89-895650-0 Fax: 49-89-895650-22 Detroit Tri-Atria Office Building 32255 Northwestern Highway, Suite 190 Farmington Hills, MI 48334 Tel: 248-538-2250 Fax: 248-538-2260 Japan Microchip Technology Intl. Inc. Benex S-1 6F 3-18-20, Shinyokohama Kohoku-Ku, Yokohama-shi Kanagawa, 222-0033, Japan Tel: 81-45-471- 6166 Fax: 81-45-471-6122 Italy Arizona Microchip Technology SRL Centro Direzionale Colleoni Palazzo Taurus 1 V. Le Colleoni 1 20041 Agrate Brianza Milan, Italy Tel: 39-039-65791-1 Fax: 39-039-6899883 Los Angeles 18201 Von Karman, Suite 1090 Irvine, CA 92612 Tel: 949-263-1888 Fax: 949-263-1338 Korea Microchip Technology Korea 168-1, Youngbo Bldg. 3 Floor Samsung-Dong, Kangnam-Ku Seoul, Korea Tel: 82-2-554-7200 Fax: 82-2-558-5934 United Kingdom Arizona Microchip Technology Ltd. 505 Eskdale Road Winnersh Triangle Wokingham Berkshire, England RG41 5TU Tel: 44 118 921 5869 Fax: 44-118 921-5820 Printed on recycled paper. 01/09/01 Mountain View Analog Product Sales 1300 Terra Bella Avenue Mountain View, CA 94043-1836 Tel: 650-968-9241 Fax: 650-967-1590 All rights reserved. (c) 2001 Microchip Technology Incorporated. Printed in the USA. 1/01 Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchipis products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, except as maybe explicitly expressed herein, under any intellectual property rights. The Microchip logo and name are registered trademarks of Microchip Technology Inc. in the U.S.A. and other countries. All rights reserved. All other trademarks mentioned herein are the property of their respective companies. (c) 2001 Microchip Technology Inc. DS21468 7 TC7662A-5 9/11/96 |
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