TC7660 MICROCHIP | Alldatasheet
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© 2001 Microchip Technology Inc. DS21465A CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
FEATURES
I Converts +5V Logic Supply to ±5V System I Low Cost and Easy to Use — Only Two External Capacitors Required I RS232 Negative Power Supply I Available in Small Outline (SO) Package I No Dx Diode Required for High Voltage Operation GENERAL DESCRIPTION The TC7660 is a pin-compatible replacement for the Industry standard TC7660 charge pump voltage converter. It converts a +1.5V to +10V input to a corresponding – 1.5V to -10V output using only two low-cost capacitors, eliminat- ing inductors and their associated cost, size and EMI. The on-board oscillator operates at a nominal fre- quency of 10kHz. Operation below 10kHz (for lower supply current applications) is possible by connecting an external capacitor from OSC to ground (with pin 1 open). The TC7660 is available in both 8-pin DIP and 8-pin SOIC packages in commercial and extended temperature ranges.
ORDERING INFORMATION
Part No. Package Range TC7660COA 8-Pin SOIC 0 °C to +70°C TC7660CPA 8-Pin Plastic DIP 0 °C to +70°C TC7660EOA 8-Pin SOIC – 40 °C to +85°C TC7660EPA 8-Pin Plastic DIP – 40 °C to +85°C TC7660IJA 8-Pin CerDIP – 40 °C to +85°C TC7660MJA 8-Pin CerDIP – 55 °C to +125°C TC7660EV Evaluation Kit for Charge Pump Family FUNCTIONAL BLOCK DIAGRAM TC7660CPA TC7660EPA TC7660IJA NC CAP + G ND CAP – NC CAP + GND CAP –VOUT LOW VOLTAGE (LV) OSC VOUT LOW VOLTAGE (LV) OSC NC = NO INTERNAL CONNECTION TC7660COA TC7660CPA TC7660 GND INTERNAL VOLTAGE REGULATOR RC OSCILLATOR VOLTAGE – LEVEL TRANSLATOR ÷ 2 V + CAP + OSC LV LOGIC NETWORK VOUT CAP –4 PIN CONFIGURATION (DIP and SOIC)
© 2001 Microchip Technology Inc. DS21465ATC7660-7 9/30/96 ABSOLUTE MAXIMUM RATINGS* LV and OSC Inputs for V+ < 5.5V (V+ – 5.5V) to (V++0.3V) for V+ > 5.5V Power Dissipation (TA ≤ 70°C) (Note 2) Operating Temperature Range *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 perma- nent 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 operation sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS: Specifications Measured Over Operating Temperature Range With, V+ = 5V, COSC = 0, Test Circuit (Figure 1), unless otherwise indicated. Symbol Parameter Test Conditions Min Typ Max Unit I+ Supply Current R L = ∞ — 80 180 µA V+H Supply Voltage Range, High Min ≤ TA ≤ Max, 3 — 10 V R L = 10 kΩ , LV Open V+L Supply Voltage Range, Low Min ≤ TA ≤ Max, 1.5 — 3.5 V R L = 10 kΩ , LV to GND R OUT Output Source Resistance I OUT = 20mA, TA = 25°C — 70 100 Ω IOUT = 20mA, 0°C ≤ TA ≤ +70°C — — 120 Ω (C Device) IOUT = 20mA, – 40°C ≤ TA ≤ +85°C — — 130 Ω (I Device) I OUT = 20mA, –55°C ≤ TA ≤ +125°C — 104 150 Ω (M Device) V+ = 2V, IOUT = 3 mA, LV to GND — 150 300 Ω 0°C ≤ TA ≤ +70°C V+ = 2V, IOUT = 3 mA, LV to GND — 160 600 Ω – 55°C ≤ TA ≤ +125°C (Note 3) FOSC Oscillator Frequency Pin 7 open — 10 — kHz PEFF Power Efficiency R L = 5kΩ 95 98 — % VOUT EFF Voltage Conversion Efficiency RL = ∞ 97 99.9 — % ZOSC Oscillator Impedance V + = 2V — 1 — M Ω V+ = 5V — 100 — k Ω NOTES: 1. Connecting any input terminal to voltages greater than V+ or less than GND may cause destructive latch-up. It is recommended that no inputs from sources operating from external supplies be applied prior to "power up" of the TC7660. 2. Derate linearly above 50°C by 5.5 mW/°C. 3. TC7660M only. 4. The TC7660 can be operated without the Dx diode over full temperature and voltage range.
© 2001 Microchip Technology Inc. DS21465A TC7660-7 9/30/96 TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 1) 500 450 400 200 150 100 –55 –25 0 +25 +50 +75 +100 +125 TEMPERATURE ( °C) Output Source Resistance vs. Temperature OUTPUT SOURCE RESISTANCE ( Ω ) V + = +2V V + = +5V –25 0 +25 +75 +100 +125 +50 Operating Voltage vs. Temperature –55 SUPPLY VOLTAGE (V) TEMPERATURE ( °C) 10k 100Ω OUTPUT SOURCE RESISTANCE ( Ω ) TA = +25°C Output Source Resistance vs. Supply Voltage 6543210 SUPPLY VOLTAGE (V) OSCILLATOR FREQUENCY (Hz) 100POWER CONVERSION EFFICIENCY (%) 100 1k 10k Power Conversion Eff. vs. Osc. Freq. TEMPERATURE ( °C) OSCILLATOR FREQUENCY (kHz) Unloaded Osc. Freq. vs. Temperature –55 –25 0 +25 +50 +75 +100 +125 V+ = +5V OSCILLATOR CAPACITANCE (pF) 10kOSCILLATOR FREQUENCY (Hz) 100 10 100 1000 10k IOUT = 1 mA TA = +25°C V+ = +5V TA = +25°C V+ = +5V IOUT = 1 mA IOUT = 15 mA 10Ω SUPPLY VOLTAGE RANGE
© 2001 Microchip Technology Inc. DS21465ATC7660-7 9/30/96 TYPICAL CHARACTERISTICS (Cont.) Output Voltage vs. Load Current OUTPUT VOLTAGE (V) 123 4567 8 LOAD CURRENT (mA) SLOPE 150 Ω TA = +25°C V+ = +2V LOAD CURRENT (mA) POWER CONVERSION EFFICIENCY (%) 100 100 SUPPLY CURRENT (mA) (Note) 10 20 30 40 50 60 TA = +25°C V+ = +5V Supply Current and Power Conversion Efficiency vs. Load Current POWER CONVERSION EFFICIENCY (%) LOAD CURRENT (mA) 100 SUPPLY CURRENT (mA) (Note) TA = +25°C V+ = 2V OUTPUT CURRENT (mA) OUTPUT VOLTAGE (V) Output Voltage vs. Output Current –10 10 20 30 40 50 60 70 80 90 100 TA = +25°C LV OPEN LOAD CURRENT (mA) OUTPUT VOLTAGE (V) Output Voltage vs. Load Current 10 20 30 40 50 60 70 80 TA = +25°C V+ = +5V SLOPE 55 Ω
© 2001 Microchip Technology Inc. DS21465ATC7660-7 9/30/96 PACKAGE DIMENSIONS Dimensions: inches (mm) .400 (10.16) .370 (9.40) .300 (7.62) .230 (5.84) .065 (1.65) .045 (1.14) PIN 1 .200 (5.08) .160 (4.06) .200 (5.08) .125 (3.18) .110 (2.79) .090 (2.29) .020 (0.51) .016 (0.41) .040 (1.02) .020 (0.51) .320 (8.13) .290 (7.37) .150 (3.81) MIN. 3° MIN..015 (0.38) .008 (0.20) .400 (10.16) .320 (8.13) 8-Pin Plastic DIP 8-Pin CerDIP 3° MIN. PIN 1 .260 (6.60) .240 (6.10) .045 (1.14) .030 (0.76) .070 (1.78) .040 (1.02) .400 (10.16) .348 (8.84) .200 (5.08) .140 (3.56) .150 (3.81) .115 (2.92) .110 (2.79) .090 (2.29) .022 (0.56) .015 (0.38) .040 (1.02) .008 (0.20) .310 (7.87) .290 (7.37) .400 (10.16) .310 (7.87)
© 2001 Microchip Technology Inc. DS21465A TC7660-7 9/30/96 8-Pin SOIC .050 (1.27) TYP. 8° MAX. .244 (6.20) .228 (5.79) .157 (3.99) .150 (3.81) .197 (5.00) .189 (4.80) .020 (0.51) .013 (0.33) .010 (0.25) .004 (0.10) .069 (1.75) .007 (0.18) .050 (1.27) .016 (0.40) Dimensions: inches (mm) PACKAGE DIMENSIONS (CONT.)
© 2001 Microchip Technology Inc. DS21465ATC7660-7 9/30/96 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 Microchipís 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 intellec- reserved. All other trademarks mentioned herein are the property of their respective companies. All rights reserved. © 2001 Microchip Technology Incorporated. Printed in the USA. 1/01 Printed on recycled paper. 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 Rocky Mountain 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7966 Fax: 480-792-7456 Atlanta
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