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TC962
High Current Charge Pump DC-to-DC Converter
Features:
* * * * * * * * Pin Compatible With TC7662/ICL7662/SI7661 High Output Current 80 mA No External Diodes Required Wide Operating Range 3V to 18V Low Output Impedance 28 Typ. No Low Voltage Terminal Required Application Zener On-Chip OSC Frequency Doubling Pin Option for Smaller Output Capacitors
General Description:
The TC962 is an advanced version of the industry standard TC7662 high voltage DC-to-DC converter. Using improved design techniques and CMOS construction, the TC962 can source as much as 80 mA versus the 7662's 20 mA capability. As an inverter, the TC962 can put out voltages as high as 18V and as low as 3V without the need for external diodes. The output impedance of the device is a low 28 (with the proper capacitors), voltage conversion efficiency is 99.9%, and power conversion efficiency is 97%. The low voltage terminal (pin 6) required in some TC7662 applications has been eliminated. Grounding this terminal will double the oscillator frequency from 12 kHz to 24 kHz. This will allow the use of smaller capacitors for the same output current and ripple, in most applications. Only two external capacitors are required for inverter applications. In the event an external clock is needed to drive the TC962 (such as paralleling), driving this pin directly will cause the internal oscillator to sync to the external clock. Pin 1, which is used as a test pin on the 7662, is a voltage reference Zener on the TC962. This Zener (6.4V at 5 mA) has a dynamic impedance of 12 and is intended for use where the TC962 is supplying current to external regulator circuitry and a reference is needed for the regulator circuit. (See Section 3.0 "Applications Information" Applications Information). The TC962 is compatible with the LTC1044, SI7661 and ICL7662. It should be used in designs that require greater power and/or less input to output voltage drop. It offers superior performance over the ICL7660S.
Applications:
* * * * Laptop Computers Disk Drives Process Instrumentation P-Based Controllers
Device Selection Table
Part Number TC962COE TC962CPA TC962EPA TC962IJA TC962MJA Package 16-Pin SOIC Wide 8-Pin Plastic DIP 8-Pin Plastic DIP 8-Pin CERDIP 8-Pin CERDIP Operating Temp. Range 0C to +70C 0C to +70C -40C to +85C -25C to +85C -55C to +125C
Package Type
16-Pin SOIC Wide 8-Pin DIP 8-Pin CERDIP
Zener Cathode 1 * C+ 2 TC962CPA TC962EPA GND 3 TC962IJA C- 4 TC962MJA 8 VDD 7 COSC 6 FREQ x 2 5 VOUT Zener Cathode 1 NC 2 C+ 3 NC 4 GND 5 NC 6 C- 7 NC 8 16 VDD 15 NC 14 COSC 13 NC
TC962COE
12 FREQ x 2 11 NC 10 VOUT 9 NC
(c) 2006 Microchip Technology Inc.
DS21484C-page 1
TC962
Functional Block Diagram
8 FREQ x 2 - OSC/C Timing 6 7 Level Shift P SW1 2 CAP + I I VDD
TC962
Q + - F/F C Q
Comparator with Hysteresis
Level Shift
N SW4
+ CP External 3 GND
Zener Cathode
1 6.4V VREF + Level Shift OUT N SW2 4 CAP - CR EXT
RL
Level Shift
N SW3 5 VOUT
DS21484C-page 2
(c) 2006 Microchip Technology Inc.
TC962
1.0 ELECTRICAL CHARACTERISTICS
*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.
Absolute Maximum Ratings*
Supply Voltage (VDD to GND) ..............................+18V Input Voltage Any Pin ......................... (VDD +0.3) to (VSS -0.3) (Note 1) Current Into Any Pin........................................... 10 mA ESD Protection ................................................ 2000V Output Short Circuit ........... Continuous (at 5.5V Input) Package Power Dissipation (TA 70C) SOIC ....................................................... 760 mW PDIP........................................................ 730 mW CERDIP .................................................. 800 mW Package Thermal Resistance CERDIP, RJ-A ......................................... 90C/W PDIP, RJ-A ............................................ 140C/W Operating Temperature Range CPA, COE ....................................... 0C to +70C IJA ................................................ -25C to +85C EPA .............................................. -40C to +85C MJA ............................................ -55C to +125C Storage Temperature Range ............. -65C to +150C
TC962 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: VDD = 15V, TA = 25C (See Figure ) unless otherwise noted. Symbol VDD IS Parameter Supply Voltage Supply Current VDD = 15V Min 3 -- -- -- -- -- -- -- -- -- -- -- -- 93 -- 99 -- 96 6.0 -- Typ -- -- 510 560 650 190 210 210 32 35 -- 12 24 97 -- 99.9 -- -- 6.2 12 Max 18 -- 700 -- -- -- -- -- 37 40 50 -- -- -- -- -- -- -- 6.4 -- Units V A RL = TA = +25C 0 TA +70C -55C TA +125C TA = +25C 0 TA +70C -55C TA +125C IL = 20 mA, VDD = 15V IL = 80 mA, VDD = 15V IL = 3 mA, VDD = 5V Pin 6 Open Pin 6 GND RL = 2 k RL = Over temperature range IZ = 5 mA IL = 2.5 mA to 7.5 mA Test Conditions
VDD = 5V
RO
Output Source Resistance Oscillator Frequency Power Efficiency Voltage Efficiency
FOSC PEFF VDEF
kHz % %
VZ ZZT
Note 1:
Zener Voltage Zener Impedance
V
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 TC962.
(c) 2006 Microchip Technology Inc.
DS21484C-page 3
TC962
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No. (8-Pin DIP) (8-Pin CERDIP) 1 2 3 4 5 6 7 8
PIN FUNCTION TABLE
Symbol Zener Cathode C+ GND CVOUT FREQ x 2 COSC VDD Cathode of internal Zener diode. Positive side of external CP capacitor (pump cap). Ground terminal. Negative side of external CP capacitor (pump cap). Output voltage. If grounded, frequency doubles. Capacitor to GND will decrease frequency. Input voltage. Description
Pin No. (16-Pin SOIC) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Symbol Zener Cathode NC C
+
Description Cathode of internal Zener diode. No connect. Positive side of external CP capacitor (pump cap). No connect. Ground terminal. No connect. Negative side of external CP capacitor (pump cap). No connect. No connect. Output voltage. No connect. If grounded, frequency doubles. No connect. Capacitor to GND will decrease frequency. No connect. Input voltage.
NC GND NC C
-
NC NC VOUT NC FREQ x 2 NC COSC NC VDD
DS21484C-page 4
(c) 2006 Microchip Technology Inc.
TC962
3.0
3.1
APPLICATIONS INFORMATION
Theory of Operation
current source and double the frequency. This will double the charge current going into the internal capacitor, as well as any capacitor added to pin 7. A Zener diode has been added to the TC962 for use as a reference in building external regulators. This Zener runs from pin 1 to ground.
The TC962 is a capacitive pump (sometimes called a switched capacitor circuit), where four MOSFET switches control the charge and discharge of a capacitor. The functional block diagram shows how the switching action works. SW1 and SW2 are turned on simultaneously, charging CP to the supply voltage, VIN. This assumes that the on resistance of the MOSFETs in series with the capacitor results in a charging time (3 time constants) that is less than the on time provided by the oscillator frequency as shown: 3 (RDS(ON) CP) < CP/(0.5 fOSC) In the next cycle, SW1 and SW2 are turned off and after a very short interval of all switches being off (this prevents large currents from occurring due to cross conduction), SW3 and SW4 are turned on. The charge in CP is then transferred to CR, but with the polarity inverted. In this way, a negative voltage is now derived. An oscillator supplies pulses to a flip-flop that is then fed to a set of level shifters. These level shifters then drive each set of switches at one-half the oscillator frequency. The oscillator has two pins that control the frequency of oscillation. Pin 7 can have a capacitor added that is returned to ground. This will lower the frequency of the oscillator by adding capacitance to the timing capacitor internal to the TC962. Grounding pin 6 will turn on a
3.2
Latch-Up
All CMOS structures contain a parasitic SCR. Care must be taken to prevent any input from going above or below the supply rail, or latch-up will occur. The result of latch-up is an effective short between VDD and VSS. Unless the power supply input has a current limit, this latch-up phenomena will result in damage to the device. (See AN763, Latch-up Protection for MOSFET Drivers.)
690 IS NC + 10 F 1 2 CP 3 4 8 7 IL COSC 5 RL VOUT (-5V) CR + 10 F V+ (+5V)
TC962
FIGURE 3-1:
Test Circuit
Combined Negative Converter and Positive Multiplier
V+ 1 2 CP2 + 10 F 3 4 CP1 + 8 7 1 VD1 VD2 VOUT = -V + C R1 10 F + VOUT = 2V + -2V 10 F CP
D
Split V+ In Half
V+ 8 7
TC962 6
5 +
2 + 10 F 3 4
TC962
6 5 V+ VOUT = 2
CR
+
10 F
Lowering Output Resistance by Paralleling Devices
V+
Positive Voltage Multiplier
V+
1 2 CP1 + 10 F 3 4
8 7 + 10 F
1 2 CP2 3 4
8 7
1 2 3 4 VOUT CR + 10 F
8 7 VD1 VD2 CP + 10 F CP + VOUT = 2V +-2V 10 F
TC962 6
5
TC962 6
5
TC962 6
5
D
FIGURE 3-2:
Typical Applications
(c) 2006 Microchip Technology Inc.
DS21484C-page 5
TC962
4.0
Note:
TYPICAL CHARACTERISTICS
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. Circuit of Figure , CP = CR = 10 F, CPESR CRESR 1.
Supply Current vs. Temperature
700 600
SUPPLY CURRENT (A)
Oscillator Frequency vs. C OSC
20 10k TA = +25C 18
FREQUENCY (kHz)
Frequency vs. Temperature
COSC = FREQ x 2 = OPEN
400 300 200 100 0 -60 -40 -20
V + = 15V
FREQUENCY (Hz)
500
16 14 12 10 8
1k
100
V + = 15V
10 0 20 40 60 80 100 120 140 TEMPERATURE (C) 1 10 100 1000 10,000 CAPACITANCE (pF)
6 -60 -40 -20 0 20 40 60 80 100 120 140 TEMPERATURE (C)
Output Resistance vs. Temperature
80 OUTPUT RESISTANCE ( ) 70 60 50 40 30 20 10 -60 -40 -20 V+ = 15V IL = 20 mA 10 0 4.5 V+ = 5V IL = 3 mA 50
Current vs. Zener Voltage
POWER CONVERSION EFFICIENCY (%) TA = +25C
Power Conversion Efficiency vs. I LOAD
100 90 80 70 60 50 40 30 20 10 0 8 16 24 32 40 48 56 64 72 80 SUPPLY CURRENT EFFICIENCY TA = +25C 150 SUPPLY CURRENT (mA) 135 120 105 90 75 60 45 30 15 0 LOAD CURRENT (mA)
CURRENT (mA)
40
30
20
0 20 40 60 80 100 120 140 TEMPERATURE (C)
4.0
5.5
6.0
6.5
7.0
ZENER VOLTAGE (V)
Output Resistance vs. Input Voltage
110 100 TA = +25C
OUTPUT RESISTANCE ()
90 80 70 60 50 40 30 20 10 0 2 4 6 8 10 12 14 16 18 INPUT VOLTAGE (V) 20 3 A 20 A
DS21484C-page 6
(c) 2006 Microchip Technology Inc.
TC962
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 16-Pin SOIC (Wide) Devices
User Direction of Feed
Pin 1
W
P Standard Reel Component Orientation for 713 Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size
16-Pin SOIC (W)
16 mm
12 mm
1000
13 in
5.3
Package Dimensions
8-Pin CDIP (Narrow)
.110 (2.79) .090 (2.29) Pin 1
.300 (7.62) .230 (5.84)
.055 (1.40) Max. .400 (10.16) .370 (9.40) .200 (5.08) .160 (4.06) .200 (5.08) .125 (3.18)
.020 (0.51) Min. .320 (8.13) .290 (7.37) .040 (1.02) .020 (0.51) .015 (0.38) .008 (0.20) .400 (10.16) .320 (8.13) .065 (1.65) .020 (0.51) .045 (1.14) .016 (0.41) Dimensions: inches (mm)
.150 (3.81) Min.
3 Min.
(c) 2006 Microchip Technology Inc.
DS21484C-page 7
TC962
Package Dimensions (Continued)
8-Pin Plastic DIP
Pin 1
.260 (6.60) .240 (6.10)
.045 (1.14) .030 (0.76) .400 (10.16) .348 (8.84) .200 (5.08) .140 (3.56) .150 (3.81) .115 (2.92)
.070 (1.78) .040 (1.02)
.310 (7.87) .290 (7.37)
.040 (1.02) .020 (0.51)
.015 (0.38) .008 (0.20) .400 (10.16) .310 (7.87)
3 Min.
.110 (2.79) .090 (2.29)
.022 (0.56) .015 (0.38)
Dimensions: inches (mm)
16-Pin SOIC (Wide)
Pin 1
.299 (7.59) .419 (10.65) .291 (7.40) .398 (10.10)
.413 (10.49) .398 (10.10) .104 (2.64) .097 (2.46) .050 (1.27) Typ. .019 (0.48) .014 (0.36) .012 (0.30) .004 (0.10)
8 Max. .050 (1.27) .016 (0.40)
.013 (0.33) .009 (0.23)
Dimensions: inches (mm)
DS21484C-page 8
(c) 2006 Microchip Technology Inc.
TC962
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: * Product Support - Data sheets and errata, application notes and sample programs, design resources, user's guides and hardware support documents, latest software releases and archived software * General Technical Support - Frequently Asked Questions (FAQ), technical support requests, online discussion groups, Microchip consultant program member listing * Business of Microchip - Product selector and ordering guides, latest Microchip press releases, listing of seminars and events, listings of Microchip sales offices, distributors and factory representatives
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Customers should contact their distributor, representative or field application engineer (FAE) for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document. Technical support is available through the web site at: http://support.microchip.com
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(c) 2006 Microchip Technology Inc.
DS21484C-page 9
TC962
READER RESPONSE
It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip product. 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: RE: Technical Publications Manager Reader Response Total Pages Sent ________
From: Name Company Address City / State / ZIP / Country Telephone: (_______) _________ - _________ Application (optional): Would you like a reply? Device: TC962 Questions: 1. What are the best features of this document? Y N Literature Number: DS21484C FAX: (______) _________ - _________
2. How does this document meet your hardware and software development needs?
3. Do you find the organization of this document easy to follow? If not, why?
4. What additions to the document do you think would enhance the structure and subject?
5. What deletions from the document could be made without affecting the overall usefulness?
6. Is there any incorrect or misleading information (what and where)?
7. How would you improve this document?
DS21484C-page 10
(c) 2006 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices: * * Microchip products meet the specification contained in their particular Microchip Data Sheet. Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip's Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. Microchip is willing to work with the customer who is concerned about the integrity of their code. Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as "unbreakable."
*
* *
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip's code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.
Trademarks The Microchip name and logo, the Microchip logo, Accuron, dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro, PICSTART, PRO MATE, PowerSmart, rfPIC, and SmartShunt are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. AmpLab, FilterLab, Migratable Memory, MXDEV, MXLAB, SEEVAL, SmartSensor and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. Analog-for-the-Digital Age, Application Maestro, dsPICDEM, dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, Linear Active Thermistor, Mindi, MiWi, MPASM, MPLIB, MPLINK, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartTel, Total Endurance, UNI/O, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. 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) 2006, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper.
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DS21484C-page 11
WORLDWIDE SALES AND SERVICE
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DS21484C-page 12
(c) 2006 Microchip Technology Inc.

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