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Features
* * * * * * *
TC3682/TC3683/TC3684
General Description
The TC3682/TC3683/TC3684 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 TC3682, 35kHz for the TC3683, and 125kHz for the TC3684. When the SHDN pin is held at a logic low, the device goes into a very low power mode of operation consuming less than 1A (typ) of supply current. Low output source impedance (typically 120), provides output current up to 10mA. The TC3682/TC3683/ TC3684 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, small physical size and shutdown mode feature make this family of products useful for a wide variety of negative bias power supply applications. Operating Temp. Range -40C to +85C -40C to +85C -40C to +85C
+ C2 C2-
Inverting Charge Pump Voltage Doublers with Active Low Shutdown
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 TC3682 - 225A (typ) for TC3683 - 700A (typ) for TC3684 * Fully Compatible with 1.8V Logic Systems
Applications
* * * * * LCD Panel Bias Cellular Phones PA Bias Pagers PDAs, Portable Data Loggers Battery-Powered Devices
Device Selection Table
Part Number
www..com TC3682EUA
Package 8-Pin MSOP
Osc. Freq. (kHz) 12 35 125
Functional Block Diagram
+ C1 C1+ C1- C2+ VIN SHDN Input ON OFF
TC3683EUA 8-Pin MSOP TC3684EUA 8-Pin MSOP
Package Type
8-Pin MSOP
C1- C2+ C2- VOUT 1 2 3 4 8 SHDN C1+ VIN GND
TC3682 TC3683 TC3684
VOUT
GND
VOUT = -(2 x VIN) -C OUT +
TC3682 TC3683 TC3684
7 6 5
C1 must have a voltage rating VIN C2 and COUT must have a voltage rating 2VIN
2002 Microchip Technology Inc.
DS21556B-page 1
TC3682/TC3683/TC3684
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.
TC3682/TC3683/TC3684 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: TA = -40C to +85C, VIN = +5V, C1 = C2 = 3.3F (TC3682), C1 = C2 = 1F (TC3683), C1 = C2 = 0.33F (TC3684), SHDN = GND, Typical values are at TA = +25C Symbol IDD Parameter Supply Current Min -- -- -- -- 1.8 -- 8.4 24.5 65 1.4 -- 95 -- -- -- -- Typ 95 225 700 0.5 -- -- 12 35 125 -- -- 99 120 1800 600 200 Max 160 480 1500 2 -- 5.5 15.6 45.5 170 -- 0.4 -- 170 -- -- -- Units
A
Device TC3682 TC3683 TC3684 All All All TC3682 TC3683 TC3684 All All All All TC3682 TC3683 TC3684
Test Conditions SHDN = VIN SHDN = VIN SHDN = VIN SHDN = GND, VIN = +5V RLOAD = 1k RLOAD = 1k
ISHDN VMIN VMAX FOSC
Shutdown Supply Current Minimum Supply Voltage Maximum Supply Voltage Oscillator Frequency
A
V V kHz
VIH VIL VEFF ROUT TWK
SHDN Input Logic High SHDN Input Logic Low Voltage Conversion Efficiency Output Resistance Wake-up Time From Shutdown Mode
V V %
sec
VIN = VMIN to VMAX VIN = VMIN to VMAX RLOAD = ILOAD = 0.5mA to 10mA (Note 1) RLOAD = 2k
Note 1: Capacitor contribution is approximately 20% of the output impedance (ESR = 1/ pump frequency x capacitance). www..com
DS21556B-page 2
2002 Microchip Technology Inc.
TC3682/TC3683/TC3684
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+ SHDN 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. Shutdown input (active low).
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2002 Microchip Technology Inc.
DS21556B-page 3
TC3682/TC3683/TC3684
3.0 DETAILED DESCRIPTION
The TC3682/TC3683/TC3684 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. When the shutdown input is held at a logic low, the device goes into a very low power mode of operation consuming less than 1A of supply current. Figure 3-1 is a block diagram representation of the TC3682/TC3683/TC3684 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 TC3682 synchronously switches at 12kHz, the TC3683 synchronously switches at 35kHz, and the TC3684 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). When the shutdown input is in a low state, the oscillator and both switch matrices are powered off placing the TC3682/TC3683/TC3684 in the shutdown mode. When the VIN supply input is powered from an external battery, the shutdown mode minimizes power consumption, which in turn will extend the life of the battery.
FIGURE 3-1:
TC3682/TC3683/TC3684 ARCHITECTURE
VIN + C1 Switch Matrix (1st Stage) +
ENABLE
-VIN COUT1
Oscillator
ENABLE
+ C2
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ENABLE
-2VIN Switch Matrix (2nd Stage) + COUT2
SHDN
DS21556B-page 4
2002 Microchip Technology Inc.
TC3682/TC3683/TC3684
4.0
4.1
APPLICATIONS INFORMATION
Output Voltage Considerations
4.3
Input Supply Bypassing
The TC3682/TC3683/TC3684 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 of the `-VIN' output is approximately 50 nominal at +25C and VIN = +5V. The value of the `-2VIN' output is approximately 140 nominal at +25C and VIN = +5V. In this particular case, `-VIN' is approximately -5V and `-2VIN' is approximately -10V at very light loads and each stage 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
Shutdown Input
The TC3682/TC3683/TC3684 is enabled when SHDN is high, and disabled when SHDN is low. This input cannot be allowed to float. (If SHDN is not required, see the TC2682/TC2683/TC2684 data sheet.) The SHDN input should be limited to 0.3V above VIN.
4.2
Capacitor Selection
4.5
Inverting Voltage Doubler
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 most common application for the TC3682/TC3683/ TC3684 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.
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.
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.
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FIGURE 4-1:
VIN CIN
INVERTING VOLTAGE DOUBLER TEST CIRCUIT
+ 6 VIN 8 SHDN
+ C1
7
C1+
1
TABLE 4-1:
C1, C2 (F) 0.33 1 3.3
OUTPUT RESISTANCE VS. C1/C2 (ESR = 0.1)
TC3682 ROUT() 633 262 120 TC3683 ROUT() 184 120 95 TC3684 ROUT() 120 102 84
+ C2
TC3682 TC3683 2 C2+ TC3684
C1- -2VIN 3 C2- GND 5 4 COUT + RL VOUT
Device TC3682 TC3683 TC3684
CIN 3.3F 1F 0.33F
C1 3.3F 1F 0.33F
C2 3.3F 1F 0.33F
COUT 3.3F 1F 0.33F
TABLE 4-2:
OUTPUT VOLTAGE RIPPLE VS. COUT (ESR = 0.1) IOUT = 1mA
TC3682 VRIPPLE (mV) 192 63 17 TC3683 VRIPPLE (mV) 60 21 8 TC3684 VRIPPLE (mV) 27 16 7
4.6
Layout Considerations
COUT (F) 0.33 1 3.3
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.
2002 Microchip Technology Inc.
DS21556B-page 5
TC3682/TC3683/TC3684
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
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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)
DS21556B-page 6
2002 Microchip Technology Inc.
TC3682/TC3683/TC3684
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.
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2002 Microchip Technology Inc.
DS21556B-page7
TC3682/TC3683/TC3684
NOTES:
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DS21556B-page8
2002 Microchip Technology Inc.
TC3682/TC3683/TC3684
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.
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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.
DS21556B-page 9
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DS21556B-page 10
2002 Microchip Technology Inc.

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