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Features
* * * * * * *
TC2682/TC2683/TC2684
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), 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.
Inverting Charge Pump Voltage Doublers
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 - 95A (typ) for TC2682 - 225A (typ) for TC2683 - 700A (typ) for TC2684
Applications
* * * * * LCD Panel Bias Cellular Phones PA Bias Pagers PDAs, Portable Data Loggers Battery-Powered Devices
Device Selection Table
Part Number TC2682EUA TC2683EUA TC2684EUA Package 8-Pin MSOP 8-Pin MSOP 8-Pin MSOP Osc. Freq. (kHz) 12 35 125 Operating Temp. Range -40C to +85C -40C to +85C -40C to +85C
Functional Block Diagram
+ C1 C1+ C1- C2+ + C2 C2- GND VOUT VIN Input
TC2682 TC2683 TC2684
VOUT = -(2 x VIN) -C OUT +
Package Type
8-Pin MSOP
C1- C2+ C2- VOUT 1 2 3 4 8 NC C1+ VIN GND
TC2682 TC2683 TC2684
7 6 5
C1 must have a voltage rating VIN C2 and COUT must have a voltage rating 2VIN
2002 Microchip Technology Inc.
DS21548B-page 1
TC2682/TC2683/TC2684
1.0 ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings*
Input Voltage (VIN to GND)....................... +6.0V, -0.3V Output Voltage (VOUT to GND)............... -12.0V, +0.3V Current at VOUT Pin.............................................20mA Short-Circuit Duration VOUT to GND ..............Indefinite Power Dissipation (TA 70C) 8-Pin MSOP .............................................320mW Operating Temperature Range.............-40C to +85C Storage Temperature (Unbiased) .......-65C to +150C
*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
Electrical Characteristics: TA = -40C to +85C, VIN = +5V, C1 = C2 = 3.3F (TC2682), C1 = C2 = 1F(TC2683), C1 = C2 = 0.33F (TC2684) SHDN = GND, Typical values are at TA = +25C Symbol IDD Parameter Supply Current Min -- -- -- 1.8 -- 8.4 24.5 65 95 -- Typ 95 225 700 -- -- 12 35 125 99 120 Max 160 480 1500 -- 5.5 15.6 45.5 170 -- 170 Units
A
Device TC2682 TC2683 TC2684 All All TC2682 TC2683 TC2684 All All
Test Conditions
VMIN VMAX FOSC
Minimum Supply Voltage Maximum Supply Voltage Oscillator Frequency
V V kHz
RLOAD = 1k RLOAD = 1k
VEFF ROUT
Note 1:
Voltage Conversion Efficiency Output Resistance
%
RLOAD = ILOAD = 0.5mA to 10mA (Note 1)
Capacitor contribution is approximately 20% of the output impedance (ESR = 1/ pump frequency x capacitance).
DS21548B-page 2
2002 Microchip Technology Inc.
TC2682/TC2683/TC2684
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No. (8-Pin MSOP) 1 2 3 4 5 6 7 8
PIN FUNCTION TABLE
Symbol C1- C2+ C2- VOUT GND VIN C1+ NC Description C1 commutation capacitor negative terminal. C2 commutation capacitor positive terminal. C2 commutation capacitor negative terminal. Doubling inverting charge pump output (-2 x VIN). Ground. Positive power supply input. C1 commutation capacitor positive terminal. No connection.
2002 Microchip Technology Inc.
DS21548B-page 3
TC2682/TC2683/TC2684
3.0 DETAILED DESCRIPTION
The TC2682/TC2683/TC2684 inverting charge pumps perform a -2x multiplication of the voltage applied to the VIN 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 switching stage inverts the voltage present at VIN 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
VIN + C1 Switch Matrix (1st Stage) -VIN
Oscillator
+ C2 Switch Matrix (2nd Stage)
VOUT = -2VIN COUT +
DS21548B-page 4
2002 Microchip Technology Inc.
TC2682/TC2683/TC2684
4.0
4.1
APPLICATIONS INFORMATION
Output Voltage Considerations
4.3
Input Supply Bypassing
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 120 nominal at +25C and VIN = +5V. In this particular case, the output is approximately -10V at very light loads and will droop according to the equation below: VDROOP = IOUT x ROUT
The VIN input should be capacitively bypassed to reduce AC impedance and minimize noise effects due to the switching internal to the device. It is recommended that a large value capacitor (at least equal to C1) be connected from VIN 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 COUT. Note: A power supply bypass capacitor is recommended.
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 COUT 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 2VIN.
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
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Table 4-1 shows various values of C1/C2 and the corresponding output resistance values for VIN = 5V @ +25C. Table 4-2 shows the output voltage ripple for various values of COUT (again assuming VIN = 5V @ +25C). The VRIPPLE values assume a 1mA output load current and a 0.1 ESRCOUT.
1 1 1 2 2 2
N
C2682 C2683 C2684
UT UT UT
ND
TABLE 4-1:
C1, C2 (F) 0.33 1 3.3
OUTPUT RESISTANCE VS. C1/C2 (ESR = 0.1)
TC2682 ROUT() 633 262 120 TC2683 ROUT() 184 120 95 TC2684 ROUT() 120 102 84
evice TC2682 TC2683 TC2684
3.3F 1F 0.33F
1 3.3F 1F 0.33F
2 3.3F 1F 0.33F
UT
3.3F 1F 0.33F
4.5
Layout Considerations
TABLE 4-2:
OUTPUT VOLTAGE RIPPLE VS. COUT2 (ESR = 0.1) IOUT = 1mA
TC2682 VRIPPLE (mV) 192 63 17 TC2683 VRIPPLE (mV) 60 21 8 TC2684 VRIPPLE (mV) 27 16 7
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.
COUT (F) 0.33 1 3.3
2002 Microchip Technology Inc.
DS21548B-page 5
TC2682/TC2683/TC2684
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
Package marking data not available at this time.
5.2
Taping Form
Component Taping Orientation for 8-Pin MSOP Devices
User Direction of Feed
PIN 1
P Standard Reel Component Orientation for TR Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size
8-Pin MSOP
12 mm
8 mm
2500
13 in
5.3
Package Dimensions
8-Pin MSOP
PIN 1
.122 (3.10) .114 (2.90)
.197 (5.00) .189 (4.80)
.026 (0.65) TYP.
.122 (3.10) .114 (2.90) .043 (1.10) MAX. .016 (0.40) .010 (0.25) .006 (0.15) .002 (0.05)
6 MAX. .028 (0.70) .016 (0.40)
.008 (0.20) .005 (0.13)
Dimensions: inches (mm)
DS21548B-page 6
2002 Microchip Technology Inc.
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 recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following: 1. 2. 3. Your local Microchip sales office The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 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.
2002 Microchip Technology Inc.
DS21548B-page7
TC2682/TC2683/TC2684
NOTES:
DS21548B-page8
2002 Microchip Technology Inc.
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 components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights.
Trademarks The Microchip name and logo, the Microchip logo, FilterLab, KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER, PICSTART, PRO MATE, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology 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. (c) 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(R) 8-bit MCUs, KEELOQ(R) 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.
2002 Microchip Technology Inc.
DS21548B-page 9
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DS21548B-page 10
2002 Microchip Technology Inc.

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