TC2682 MICROCHIP | Alldatasheet
Document overview
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Technical content
Features
- Small 8-Pin MSOP Package Operates from 1.8V to 5.5V 120 Ohms (typ) Output Resistance 99% Voltage Conversion Efficiency Only 3 External Capacitors Required Power-Saving Shutdown Mode Low Active Supply Current -9 5 µA (typ) for TC2682 - 225 µA (typ) for TC2683 - 700 µA (typ) for TC2684
Applications
LCD Panel Bias Cellular Phones PA Bias Pagers PDAs, Portable Data Loggers Battery-Powered Devices Device Selection Table Package Type General Description The TC2682/TC2683/TC2684 are CMOS charge pump converters that provide an inverted doubled output from a single positive supply. An on-board oscillator provides the clock and only three external capacitors are required for full circuit implementation. Switching frequencies are 12kHz for the TC2682, 35kHz for the TC2683, and 125kHz for the TC2684. Low output source impedance (typically 120 Ω), provides output current up to 10mA. The TC2682/ TC2683/TC2684 feature a 1.8V to 5.5V operating voltage range and high efficiency, which make them an ideal choice for a wide variety of applications requiring a negative doubled voltage derived from a single positive supply (for example: generation of -7.2V from a +3.6V lithium cell or -10V generated from a +5V logic supply). The minimum external part count and small physical size make this family of products useful for a wide variety of negative bias power supply applications. Functional Block Diagram Part Number Package Osc. Freq. (kHz) Operating Temp. Range TC2682EUA 8-Pin MSOP 12 -40°C to +85°C TC2683EUA 8-Pin MSOP 35 -40°C to +85°C TC2684EUA 8-Pin MSOP 125 -40°C to +85°C TC2682 TC2683 TC2684 VOUT NC VINC2– GND C1– C1+C2+ 8-Pin MSOP C1+ C2+ VIN C1– C2– TC2682 TC2683 TC2684 VOUT – COUT Input GND C1 must have a voltage rating ≥ VIN C2 and COUT must have a voltage rating ≥ 2VIN VOUT = -(2 x VIN) Inverting Charge Pump Voltage Doublers
DS21548B-page 2 2002 Microchip Technology Inc.
1.0 ELECTRICAL
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. TC2682/TC2683/TC2684 ELECTRICAL SPECIFICATIONS C1 = C2 = 0.33µF (TC2684) SHDN = GND, Typical values are at TA = +25°C Symbol Parameter Min Typ Max Units Device Test Conditions IDD Supply Current — 225 700 160 480 1500 µA TC2682 TC2683 TC2684 VMIN Minimum Supply Voltage 1.8 —— VA l l R LOAD = 1kΩ VMAX Maximum Supply Voltage —— 5.5 V All R LOAD = 1kΩ FOSC Oscillator Frequency 8.4 24.5 125 15.6 45.5 170 kHz TC2682 TC2683 TC2684 VEFF Voltage Conversion Efficiency 95 99 — %A l l R LOAD = ∞ ROUT Output Resistance — 120 170 Ω All I LOAD = 0.5mA to 10mA (Note 1) Note 1: Capacitor contribution is approximately 20% of the output impedance (ESR = 1/ pump frequency x capacitance).
2002 Microchip Technology Inc. DS21548B-page 3 TC2682/TC2683/TC2684
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE Pin No. (8-Pin MSOP) Symbol Description 1C 1 – C1 commutation capacitor negative terminal. 2 C2+ C2 commutation capacitor positive terminal. 3C 2 – C2 commutation capacitor negative terminal. 4V OUT Doubling inverting charge pump output (-2 x V IN). 5 GND Ground. 6V IN Positive power supply input. 7 C1+ C1 commutation capacitor positive terminal. 8 NC No connection.
DS21548B-page 4 2002 Microchip Technology Inc.
3.0 DETAILED DESCRIPTION
The TC2682/TC2683/TC2684 inverting charge pumps perform a -2x multiplication of the voltage applied to the V IN pin. Conversion is performed using two synchronous switching matrices and three external capacitors. Figure 3-1 is a block diagram representation of the TC2682/TC2683/TC2684 architecture. The first switch- ing stage inverts the voltage present at V IN and the second stage uses the ‘-VIN’ output generated from the first stage to produce the ‘-2X’ output function from the second stage switching matrix. Each device contains an on-board oscillator that synchronously controls the operation of the charge pump switching matrices. The TC2682 synchronously switches at 12kHz, the TC2683 synchronously switches at 35kHz, and the TC2684 synchronously switches at 125kHz. The different oscillator frequencies for this device family allow the user to trade-off capacitor size versus supply current. Faster oscillators can use smaller external capacitors, but will consume more supply current (see Section 1.0 Electrical Characteristics). FIGURE 3-1: TC2682/TC2683/TC2684 ARCHITECTURE VOUT = -2VIN -VIN COUT VIN Switch Matrix (1st Stage) Switch Matrix (2nd Stage) Oscillator
2002 Microchip Technology Inc. DS21548B-page 5 TC2682/TC2683/TC2684
4.0 APPLICATIONS INFORMATION
4.1 Output Voltage Considerations
The TC2682/TC2683/TC2684 perform inverting voltage conversions but do not provide any type of regulation. The output voltage will droop in a linear manner with respect to the output load current. The value of the equivalent output resistance is approximately 120Ω nominal at +25°C and V IN = +5V. In this particular case, the output is approximately -10V at very light loads and will droop according to the equation below: V DROOP = IOUT x ROUT
4.2 Capacitor Selection
In order to maintain the lowest output resistance and output ripple voltage, it is recommended that low ESR capacitors be used. Additionally, larger values of C1 and C2 will lower the output resistance and larger values of C OUT will reduce output ripple. Note: For proper charge pump operation, C1 must have a voltage rating greater than or equal to VIN, while C2 and COUT must have a voltage rating greater than or equal to IN. Table 4-1 shows various values of C1/C2 and the corresponding output resistance values for V IN = 5V @+ 2 5°C. Table 4-2 shows the output voltage ripple for various values of COUT (again assuming V IN = 5V @ +25 °C). The VRIPPLE values assume a 1mA output load current and a 0.1Ω ESRCOUT. TABLE 4-1: OUTPUT RESISTANCE VS. C1/C2 (ESR = 0.1Ω) TABLE 4-2: OUTPUT VOLTAGE RIPPLE VS. COUT2 (ESR = 0.1Ω) IOUT = 1mA
4.3 Input Supply Bypassing
The V IN input should be capacitively bypassed to reduce AC impedance and minimize noise effects due to the switching internal to the device. It is recom- mended that a large value capacitor (at least equal to C1) be connected from V IN to GND for optimal circuit performance.
4.4 Inverting Voltage Doubler
The most common application for the TC2682/TC2683/ TC2684 devices is the inverting voltage doubler (Figure 4-1). This application uses three external capacitors: C1, C2 and C OUT. Note: A power supply bypass capacitor is recommended. The output is equal to -2VIN plus any voltage drops due to loading. Refer to Table 4-1 and Table 4-2 for capacitor selection guidelines. FIGURE 4-1: DUAL VOLTAGE INVERTER TEST CIRCUIT
4.5 Layout Considerations
As with any switching power supply circuit, good layout practice is recommended. Mount components as close together as possible to minimize stray inductance and capacitance. Also use a large ground plane to minimize noise leakage into other circuitry. C1, C2 (µF) TC2682 R OUT(Ω) TC2683 ROUT(Ω) TC2684 ROUT(Ω) 0.33 633 184 120 1 262 120 102 3.3 120 95 84 COUT (µF) TC2682 VRIPPLE (mV) TC2683 VRIPPLE (mV) TC2684 VRIPPLE (mV) 0.33 192 60 27 16 32 11 6 3.3 17 8 7 N N UT UT C2682 C2683 C2684 ND evice 1 2 UT TC2682 3.3 µF 3.3 µF 3.3 µF 3.3 µF TC2683 1 µF 1 µF 1µF 1 µF TC2684 0.33µF 0.33µF 0.33 µF 0.33 µF UT
DS21548B-page 6 2002 Microchip Technology Inc.
5.0 PACKAGING INFORMATION
5.1 Package Marking Information
Package marking data not available at this time.
5.2 Taping Form
5.3 Package Dimensions
Component Taping Orientation for 8-Pin MSOP Devices Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 8-Pin MSOP 12 mm 8 mm 2500 13 in Carrier Tape, Number of Components Per Reel and Reel Size User Direction of Feed PIN 1 Standard Reel Component Orientation for TR Suffix Device P 8-Pin MSOP .122 (3.10) .114 (2.90) .122 (3.10) .114 (2.90) .043 (1.10) MAX. .006 (0.15) .002 (0.05) .016 (0.40) .010 (0.25) .197 (5.00) .189 (4.80) .008 (0.20) .005 (0.13) .028 (0.70) .016 (0.40) 6° MAX. .026 (0.65) TYP. PIN 1 Dimensions: inches (mm)
2002 Microchip Technology Inc. DS21548B-page7 TC2682/TC2683/TC2684 Sales and Support Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom- mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following: 1. Your local Microchip sales office 2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 3. The Microchip Worldwide Site (www.microchip.com) Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using. New Customer Notification System Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
DS21548B-page8 2002 Microchip Technology Inc. NOTES:
2002 Microchip Technology Inc. DS21548B-page 9 TC2682/TC2683/TC2684 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 Microchip’s products as critical com- ponents in life support systems is not authorized except with express written approval by Microchip. No licenses are con- veyed, implicitly or otherwise, under any intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, FilterLab, K EELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER, PICSTART, PRO MATE, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Tech- nology Incorporated in the U.S.A. and other countries. dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, microPort, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. Serialized Quick Turn Programming (SQTP) is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received QS-9000 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona in July 1999 and Mountain View, California in March 2002. The Company’s quality system processes and procedures are QS-9000 compliant for its PICmicro® 8-bit MCUs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, non-volatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001 certified.
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