M TC962 High Current Charge Pump DC-to-DC Converter Features General Description • Pin Compatible With TC7662/ICL7662/SI7661 The TC962 is an advanced version of the industry (cid:127) High Output Current 80mA standard TC7662 high voltage DC-to-DC converter. Using improved design techniques and CMOS (cid:127) No External Diodes Required construction, the TC962 can source as much as 80mA (cid:127) Wide Operating Range 3V to 18V versus the 7662’s 20mA capability. (cid:127) Low Output Impedance 28 Ω Typ. As an inverter, the TC962 can put out voltages as high (cid:127) No Low Voltage Terminal Required as 18V and as low as 3V without the need for external (cid:127) Application Zener On-Chip diodes. The output impedance of the device is a low (cid:127) OSC Frequency Doubling Pin Option for Smaller 28Ω (with the proper capacitors), voltage conversion Output Capacitors efficiency is 99.9%, and power conversion efficiency is 97%. Applications The low voltage terminal (pin 6) required in some (cid:127) Laptop Computers TC7662 applications has been eliminated. Grounding (cid:127) Disk Drives this terminal will double the oscillator frequency from 12kHz to 24kHz. This will allow the use of smaller (cid:127) Process Instrumentation capacitors for the same output current and ripple, in (cid:127) µP-Based Controllers most applications. Only two external capacitors are required for inverter applications. In the event an Device Selection Table external clock is needed to drive the TC962 (such as paralleling), driving this pin directly will cause the Operating Part internal oscillator to sync to the external clock. Package Temp. Number Range Pin 1, which is used as a test pin on the 7662, is a voltage reference zener on the TC962. This zener TC962COE 16-Pin SOIC Wide 0°C to +70°C (6.4V at 5mA) has a dynamic impedance of 12Ω and is TC962CPA 8-Pin Plastic DIP 0°C to +70°C intended for use where the TC962 is supplying current TC962EPA 8-Pin Plastic DIP -40°C to +85°C to external regulator circuitry and a reference is needed for the regulator circuit. (See Section3.0 Applications TC962IJA 8-Pin CERDIP -25°C to +85°C Information). TC962MJA 8-Pin CERDIP -55°C to +125°C 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. Package Type 16-Pin SOIC Wide Zener 8-Pin DIP Cathode 1 16 VDD 8-Pin CERDIP NC 2 15 NC CaZtheondeer 1 (cid:127) 8 VDD C+ 3 14 COSC C+ 2 TC962CPA 7 COSC NC 4 13 NC TC962EPA GND 5 TC962COE 12 FREQ x 2 GND 3 6 FREQ x 2 TC962IJA C– 4 TC962MJA 5 VOUT NC 6 11 NC C– 7 10 VOUT NC 8 9 NC  2002 Microchip Technology Inc. DS21484B-page 1

TC962 Functional Block Diagram 8 VDD FREQ x 2 6 I I TC962 OSC/C– 7 Timing Level P SW1 Shift Q + F/F 2 CAP+ C – Q Level N SW4 + Comparator Shift CP with Hysteresis External 3 GND 1 Zener Cathode VREF 6.4V + Level N SW2 OUT CR Shift EXT 4 – CAP RL Level N SW3 Shift 5 VOUT DS21484B-page 2  2002 Microchip Technology Inc.

TC962 1.0 ELECTRICAL *Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These CHARACTERISTICS are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the Absolute Maximum Ratings* operation sections of the specifications is not implied. Supply Voltage (V to GND)..............................+18V Exposure to Absolute Maximum Rating conditions for DD extended periods may affect device reliability. Input Voltage Any Pin .........................(V +0.3) to (V -0.3) (Note 1) DD SS Current Into Any Pin............................................10mA ESD Protection................................................±2000V Output Short Circuit...........Continuous (at 5.5V Input) Package Power Dissipation (T ≤ 70°C) A SOIC.......................................................760 mW PDIP........................................................730 mW CERDIP..................................................800 mW Package Thermal Resistance CERDIP, Rθ .........................................90°C/W J-A PDIP, Rθ ............................................140°C/W J-A Operating Temperature Range CPA, COE.......................................0°C to +70°C IJA................................................-25°C to +85°C EPA..............................................-40°C to +85°C MJA............................................-55°C to +125°C Storage Temperature Range .............-65°C to +150°C TC962 ELECTRICAL SPECIFICATIONS Electrical Characteristics: V = 15V, T = 25°C (See Figure3-1) unless otherwise noted. DD A Symbol Parameter Min Typ Max Units Test Conditions V Supply Voltage 3 — 18 V DD I Supply Current — — — µA R = ∞ S L V = 15V — 510 700 T = +25°C DD A — 560 — 0 ≤ T ≤ +70°C A — 650 — -55°C ≤ T ≤ +125°C A V = 5V — 190 — T = +25°C DD A — 210 — 0 ≤ T ≤ +70°C A — 210 — -55°C ≤ T ≤ +125°C A R Output Source — 32 37 Ω I = 20mA, V = 15V O L DD Resistance — 35 40 I = 80mA, V = 15V L DD — — 50 I = 3mA, V = 5V L DD F Oscillator Frequency — 12 — kHz Pin 6 Open OSC — 24 — Pin 6 GND P Power Efficiency 93 97 — % R = 2kΩ EFF L — — — V Voltage Efficiency 99 99.9 — % R = ∞ DEF L — — — Over temperature range 96 — — V Zener Voltage 6.0 6.2 6.4 V I = 5mA Z Z Z Zener Impedance — 12 — Ω I = 2.5mA to 7.5mA ZT L Note 1: 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.  2002 Microchip Technology Inc. DS21484B-page 3

TC962 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 DIP) Symbol Description (8-Pin CERDIP) 1 Zener Cathode Cathode of internal zener diode. 2 C+ Positive side of external CP capacitor (pump cap). 3 GND Ground terminal. 4 C- Negative side of external CP capacitor (pump cap). 5 V Output voltage. OUT 6 FREQ x 2 If grounded, frequency doubles. 7 C Capacitor to GND will decrease frequency. OSC 8 V Input voltage. DD Pin No. Symbol Description (16-Pin SOIC) 1 Zener Cathode Cathode of internal zener diode. 2 NC No connect. 3 C+ Positive side of external CP capacitor (pump cap). 4 NC No connect. 5 GND Ground terminal. 6 NC No connect. 7 C- Negative side of external CP capacitor (pump cap). 8 NC No connect. 9 NC No connect. 10 V Output voltage. OUT 11 NC No connect. 12 FREQ x 2 If grounded, frequency doubles. 13 NC No connect. 14 C Capacitor to GND will decrease frequency. OSC 15 NC No connect. 16 V Input voltage. DD DS21484B-page 4  2002 Microchip Technology Inc.

TC962 3.0 APPLICATIONS INFORMATION internal to the TC962. Grounding pin 6 will turn on a current source and double the frequency. This will 3.1 Theory of Operation double the charge current going into the internal capacitor, as well as any capacitor added to pin 7. The TC962 is a capacitive pump (sometimes called a A zener diode has been added to the TC962 for use as switched capacitor circuit), where four MOSFET a reference in building external regulators. This zener switches control the charge and discharge of a runs from pin 1 to ground. capacitor. The functional block diagram shows how the switching 3.2 Latch Up action works. SW1 and SW2 are turned on simulta- neously, charging C to the supply voltage, V . This All CMOS structures contain a parasitic SCR. Care P IN assumes that the on resistance of the MOSFETs in must be taken to prevent any input from going above or series with the capacitor results in a charging time below the supply rail, or latch up will occur. The result (3time constants) that is less than the on time provided of latch up is an effective short between VDD and VSS. by the oscillator frequency as shown: Unless the power supply input has a current limit, this latch up phenomena will result in damage to the device. 3 (R C ) < C /(0.5 f ) DS(ON) P P OSC (See AN763 Latch-up Protection of CMOS ICs.) In the next cycle, SW1 and SW2 are turned off and after a very short interval of all switches being off (this FIGURE 3-1: TEST CIRCUIT prevents large currents from occurring due to cross conduction), SW3 and SW4 are turned on. The charge 690 in C is then transferred to C , but with the polarity inverPted. In this way, a negativeR voltage is now derived. 1 8 IS V+ NC (+5V) An oscillator supplies pulses to a flip-flop that is then 2 7 IL fderdiv eto eaa cshe t soef t leovf esl wshiticftheerss . aTth oensee -lheavlef l thshei ftoesrcsi ltlahteonr CP + 10µF 3 TC962 COSC RL frequency. 4 5 VOUT (–5V) The oscillator has two pins that control the frequency of oscillation. Pin 7 can have a capacitor added that is CR + 10µF returned to ground. This will lower the frequency of the oscillator by adding capacitance to the timing capacitor FIGURE 3-2: TYPICAL APPLICATIONS Combined Negative Converter and Positive Multiplier Split V+ In Half V+ V+ 1 8 1 8 2 7 VD1 2 7 CP2 +10µF34 TC962 65 VOUT = –V+ VD2 + V2VO U+ T– 2=V D CP+ 10µF34 TC962 65 CR1 10µF 10µF V+ CP1+ + CR+ 10µF VOUT = 2 Lowering Output Resistance by Paralleling Devices Positive Voltage Multiplier V+ V+ 1 8 1 8 1 8 VD1 2 7 2 7 2 7 CP1+ 10µF34 TC962 65 CP2+ 10µF 34 TC962 65 34 TC962 65 CP+ 10µFVCDP2+ 10 µV2FVO +U –T2 =VD VOUT CR 10µF +  2002 Microchip Technology Inc. DS21484B-page 5

TC962 4.0 TYPICAL CHARACTERISTICS 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. Circuit of Figure3-1, C = C = 10µF, C ≈ C ≈ 1Ω. P R PESR RESR Supply Current vs. Temperature Oscillator Frequency vs. COSC Frequency vs. Temperature 700 20 TA = +25°C COSC = FREQ x 2 = OPEN 600 10k 18 µSUPPLY CURRENT (A) 254300000000 V + V = + 1 =5 V15V FREQUENCY (Hz)110k0 FREQUENCY (kHz)11116420 100 8 0 10 6 -60 -40 -20 0 20 40 60 80100120 140 1 10 100 1000 10,000 -60 -40 -20 0 20 40 60 80100 120 140 TEMPERATURE (°C) CAPACITANCE (pF) TEMPERATURE (°C) Output Resistance vs. Temperature Current vs. Zener Voltage Power Conversion Efficiency vs. ILOAD ΩOUTPUT RESISTANCE ( ) 876543000000 V+ = 5V IL = 3mAV + = 15V IL = 20mA CURRENT (mA)54320000 TA = +25°C R CONVERSION EFFICIENCY (%)14530869700000000 EFFICIENCY TA = +25SC°UUCPRPRLEYNT 11119476305205505500SUPPLY CURRENT (mA) 20 10 WE 20 30 PO 10 15 10 0 0 0 -60 -40 -20 0 20 40 60 80100 120140 4.5 4.0 5.5 6.0 6.5 7.0 8 16 24 32 40 48 56 64 72 80 TEMPERATURE (°C) ZENER VOLTAGE (V) LOAD CURRENT (mA) Output Resistance vs. Input Voltage 110 100 TA = +25°C ΩCE ( ) 9800 N A 70 T ESIS 60 3mA 20mA R 50 T U 40 P UT 30 O 20 10 0 2 4 6 8 10 12 14 16 18 20 INPUT VOLTAGE (V) DS21484B-page 6  2002 Microchip Technology Inc.

TC962 5.0 PACKAGING INFORMATION 5.1 Package Marking Information Package marking data not available at this time. 5.2 Package Dimensions 8-Pin CDIP (Narrow) .110 (2.79) .090 (2.29) PIN1 .300 (7.62) .230 (5.84) .055 (1.40) MAX. .020 (0.51) MIN. .400 (10.16) .320 (8.13) .370 (9.40) .290 (7.37) .040 (1.02) .200 (5.08) .020 (0.51) .160 (4.06) ..210205 ((53..0188)) .150M (I3N..81) ..001058 ((00..3280)) 3°MIN. .400 (10.16) .320 (8.13) .065 (1.65) .020 (0.51) .045 (1.14) .016 (0.41) Dimensions: inches (mm) 8-Pin Plastic DIP PIN1 .260 (6.60) .240 (6.10) .045 (1.14) .070 (1.78) .030 (0.76) .040 (1.02) .310 (7.87) .400 (10.16) .290 (7.37) .348 (8.84) .200 (5.08) .140 (3.56) .040 (1.02) .020 (0.51) .015 (0.38) 3°MIN. .150 (3.81) .008 (0.20) .115 (2.92) .400 (10.16) .310 (7.87) .110 (2.79) .022 (0.56) .090 (2.29) .015 (0.38) Dimensions: inches (mm)  2002 Microchip Technology Inc. DS21484B-page 7

TC962 Package Dimensions (Continued) 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) 8° .013 (0.33) MAX. .009 (0.23) .012 (0.30) .050 (1.27) TYP. .019 (0.48) .004 (0.10) .050 (1.27) .014 (0.36) .016 (0.40) Dimensions: inches (mm) DS21484B-page 8  2002 Microchip Technology Inc.

TC962 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.  2002 Microchip Technology Inc. DS21484B-page9

TC962 NOTES: DS21484B-page10  2002 Microchip Technology Inc.

TC962 Information contained in this publication regarding device Trademarks applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to The Microchip name and logo, the Microchip logo, FilterLab, ensure that your application meets with your specifications. KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER, No representation or warranty is given and no liability is PICSTART, PRO MATE, SEEVAL and The Embedded Control assumed by Microchip Technology Incorporated with respect Solutions Company are registered trademarks of Microchip Tech- to the accuracy or use of such information, or infringement of nology Incorporated in the U.S.A. and other countries. patents or other intellectual property rights arising from such dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, use or otherwise. Use of Microchip’s products as critical com- In-Circuit Serial Programming, ICSP, ICEPIC, microPort, ponents in life support systems is not authorized except with Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, express written approval by Microchip. No licenses are con- MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode veyed, implicitly or otherwise, under any intellectual property and Total Endurance are trademarks of Microchip Technology rights. 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.  2002 Microchip Technology Inc. DS21484B-page 11

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Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: M icrochip: TC962COE713 TC962COE TC962EPA TC962CPA