TC682

TC682 MICROCHIP | Alldatasheet

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© 2006 Microchip Technology Inc. DS21453C-page 1 TC682 Features:

• 99.9% Voltage Conversion Efficiency
• 92% Power Conversion Efficiency
• Wide Input Voltage Range: - +2.4V to +5.5V
• Only 3 External Capacitors Required
• 185 μA Supply Current
• Space-Saving 8-Pin SOIC and 8-Pin PDIP Packages Applications:
• -10V from +5V Logic Supply
• -6V from a Single 3V Lithium Cell
• Portable Handheld Instruments
• Cellular Phones
• LCD Display Bias Generator
• Panel Meters
• Operational Amplifier Power Supplies Device Selection Table General Description: The TC682 is a CMOS charge pump converter that provides an inverted doubled output from a single positive supply. An on-board 12 kHz (typical) oscillator provides the clock and only 3 external capacitors are required for full circuit implementation. Low output source impedance (typically 140Ω), provides output current up to 10 mA. The TC682 fea- tures low quiescent current and high efficiency, making it the ideal choice for a wide variety of applications that require a negative voltage derived from a single positive supply (for example: generation of -6V from a 3V lithium cell or -10V generated from a +5V logic supply). The minimum external parts count and small physical size of the TC682 make it useful in many medium- current, dual voltage analog power supplies. Functional Block Diagram Package Type Part Number Package Operating Temp. Range TC682COA 8-Pin SOIC 0°C to +70°C TC682CPA 8-Pin PDIP 0°C to +70°C TC682EOA 8-Pin SOIC -40°C to +85°C TC682EPA 8-Pin PDIP -40°C to +85°C GND GND VIN VOUT = -(2 x VIN ) All Caps = 3.3 μF TC682 +2.4V < VIN < +5.5V VOUT C1+ VIN C2+ C1– C2– COUT VOUT TC682CPA TC682EPA NC GND VOUT C1+ TC682COA TC682EOA 8-Pin PDIP 8-Pin SOIC VIN C2+ C1– C2– NC GND VOUT C1+ VIN C2+ C1– C2– Inverting Voltage Doubler

© 2006 Microchip Technology Inc. 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings* Power Dissipation (TA ≤ 70°C) *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 operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. TC682 ELECTRICAL SPECIFICATIONS Electrical Characteristics: Over operating temperature range, VIN = +5V, test circuit Figure 3-1 unless otherwise noted. Symbol Parameter Min Typ Max Units Test Conditions VIN Supply Voltage Range 2.4 5.5 V RL = 2 kΩ IIN Supply Current 185 300 400 μA RL = ∞, TA = 25°C RL = ∞ ROUT VOUT Source Resistance 140 170 180 230 320 Ω IL – = 10 mA, TA = 25°C IL – = 10 mA IL – = 5 mA, VIN = 2.8V FOSC Oscillator Frequency kHz PEFF Power Efficiency RL = 2 kΩ, TA = 25°C VOUTEFF Voltage Conversion Efficiency 99.9 VOUT, RL = ∞

© 2006 Microchip Technology Inc. DS21453C-page 3 TC682 2.0 PIN DESCRIPTION The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE Pin No. (8-Pin PDIP, SOIC) Symbol

Description

C1– Input. Capacitor C1 negative terminal. C2+ Input. Capacitor C2 positive terminal. C2– Input. Capacitor C2 negative terminal. VOUT Output. Negative output voltage (-2VIN). GND Input. Ground. VIN Input. Power supply voltage. C1+ Input. Capacitor C1 positive terminal. NC No connection.

© 2006 Microchip Technology Inc. DS21453C-page 5 TC682 4.0 TYPICAL APPLICATIONS 4.1 Negative Doubling Converter The most common application of the TC682 is as a charge pump voltage converter which provides a negative output of two times a positive input voltage (Figure 4-1). FIGURE 4-1: Inverting Voltage Doubler 4.2 Capacitor Selection The output resistance of the TC682 is determined, in part, by the ESR of the capacitors used. An expression for ROUT is derived as shown below: Assuming all switch resistances are approximately equal: ROUT is typically 140Ω at +25°C with VIN = +5V and 3.3 μF low ESR capacitors. The fixed term (16RSW) is about 80-90Ω. It can be seen easily that increasing or decreasing values of C1 and C2 will affect efficiency by changing ROUT. However, be careful about ESR. This term can quickly become dominant with large electro- lytic capacitors. Table 4-1 shows ROUT for various values of C1 and C2 (assume 0.5Ω ESR). C1 must be rated at 6VDC or greater while C2 and C3 must be rated at 12VDC or greater. Output voltage ripple is affected by C3. Typically the larger the value of C3 the less the ripple for a given load current. The formula for P-P VRIPPLE is given below: VRIPPLE = {1/[2(fPUMP x C3)] + 2(ESRC3)} (IOUT) For a 10 μF (0.5Ω ESR) capacitor for C3, fPUMP = 10 kHz and IOUT = 10 mA the peak-to-peak ripple voltage at the output will be less then 60 mV. In most applications (IOUT < = 10 mA) a 10-20 μF capacitor and 1-5 μF pump capacitors will suffice. Table 4-2 shows VRIPPLE for different values of C3 (assume 1Ω ESR). TABLE 4-1: OUTPUT RESISTANCE VS. C1, C2 TABLE 4-2: VRIPPLE PEAK-TO-PEAK VS. C3 (IOUT 10mA) GND GND TC682 22 μF 22 μF 22 μF VIN C1+ C2+ C1– C2– V–OUT V–OUT VIN ROUT = 2(RSW1 + RSW2 + ESRC1 + RSW3 + RSW4 + ESRC2) +2(RSW1 + RSW2 + ESRC1 + RSW3 + RSW4 + ESRC2) +1/(fPUMP x C1) +1/(fPUMP x C2) +ESRC3 ROUT = 16RSW + 4ESRC1 + 4ESRC2 + ESRC3 +1/(fPUMP x C1) +1/(fPUMP x C2) C1, C2 (μF) ROUT(Ω) 0.05 4085 0.10 2084 0.47 510 1.00 285 3.30 145 5.00 125 10.00 105 22.00 100.00 C3 (μF) VRIPPLE (mV) 0.50 1020 1.00 520 3.30 172 5.00 120 10.00 22.00 100.00

© 2006 Microchip Technology Inc. DS21453C-page 7 TC682 5.0 TYPICAL CHARACTERISTICS Circuit of Figure 3-1, C1 = C2 = COUT = 3.3 μF, TA = 25°C unless otherwise noted. Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. VIN (V) 240 220 200 180 140 160 120 OUTPUT RESISTANCE (Ω) Output Resistance vs. VIN C1 – C3 = 3.3 µF VIN (V) 300 250 200 150 100 SUPPLY CURRENT (μA) Supply Current vs. VIN NO LOAD VIN = 5V OUTPUT CURRENT (mA) 200 150 100 OUTPUT RIPPLE (mV PK-PK) Output Ripple vs. Output Current C3 = 100 μF C3 = 10 μF LOAD CURRENT (mA) -7.5 -8.0 -8.5 -9.0 -9.5 -10.0 -10.5 VOUT (V) VOUT vs. Load Current VIN = 5V TEMPERATURE (°C) -50 100 200 180 160 140 120 100 OUTPUT SOURCE RESISTANCE (Ω) Output Source Resistance vs. Temperature VIN = 5V IOUT = 10 mA

© 2006 Microchip Technology Inc. 6.0 PACKAGING INFORMATION 6.1 Package Marking Information Package marking data not available at this time. 6.2 Taping Form 6.3 Package Dimensions Component Taping Orientation for 8-Pin SOIC (Narrow) Devices Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 8-Pin SOIC (N) 12 mm 8 mm 2500 13 in Carrier Tape, Number of Components Per Reel and Reel Size Standard Reel Component Orientation for 713 Suffix Device Pin 1 User Direction of Feed P W 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) .020 (0.51) .015 (0.38) .008 (0.20) .310 (7.87) .290 (7.37) .400 (10.16) .310 (7.87) 8-Pin Plastic DIP Dimensions: inches (mm)

© 2006 Microchip Technology Inc. DS21453C-page 9 TC682 .050 (1.27) Typ. 8° Max. Pin 1 .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) .053 (1.35) .010 (0.25) .007 (0.18) .050 (1.27) .016 (0.40) 8-Pin SOIC Dimensions: inches (mm)

© 2006 Microchip Technology Inc. NOTES:

© 2006 Microchip Technology Inc. DS21453C-page 11 TC682 THE MICROCHIP WEB SITE Microchip provides online support via our WWW site at www.microchip.com. This web site is used as a means to make files and information easily available to customers. Accessible by using your favorite Internet browser, the web site contains the following information:

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© 2006 Microchip Technology Inc. READER RESPONSE It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip prod- uct. If you wish to provide your comments on organization, clarity, subject matter, and ways in which our documentation can better serve you, please FAX your comments to the Technical Publications Manager at (480) 792-4150. Please list the following information, and use this outline to provide us with your comments about this document. To: Technical Publications Manager RE: Reader Response From: Name Company Address City / State / ZIP / Country Application (optional): Would you like a reply? Y N Device: Literature Number: Questions: DS21453C TC682 What are the best features of this document? How does this document meet your hardware and software development needs? Do you find the organization of this document easy to follow? If not, why? What additions to the document do you think would enhance the structure and subject? What deletions from the document could be made without affecting the overall usefulness? Is there any incorrect or misleading information (what and where)? How would you improve this document?

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