TC7662ACPA Microchip Technology Inc., TC7662ACPA Datasheet

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TC7662ACPA

Manufacturer Part Number
TC7662ACPA
Description
HI VOLTAGE DC-DC CONVERTER
Manufacturer
Microchip Technology Inc.
Datasheet

Specifications of TC7662ACPA

Lead Free Status / Rohs Status
RoHS Compliant part Electrostatic Device

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 2002 Microchip Technology Inc.
Features
• Wide Operating Range
• Increased Output Current (40mA)
• Pin Compatible with ICL7662/SI7661/TC7660/
• No External Diodes Required
• Low Output Impedance @ I
• No Low-Voltage Terminal Required
• CMOS Construction
• Available in 8-Pin PDIP and 8-Pin CERDIP
Applications
• Laptop Computers
• Disk Drives
• Process Instrumentation
• µP-based Controllers
Device Selection Table
M
TC7662ACPA
TC7662AEPA
TC7662AMJA
- 3V to 18V
LTC1044
- 40Ω Typ.
Packages
TC7662AIJA
Number
Part
8-Pin CERDIP
8-Pin CERDIP
8-Pin PDIP
8-Pin PDIP
Package
Charge Pump DC-to-DC Converter
L
= 20mA
-55°C to +125°C
-40°C to +85°C
-25°C to +85°C
0°C to +70°C
Operating
Range
Temp.
Package Type
General Description
The TC7662A is a pin-compatible upgrade to the
industry standard TC7660 charge pump voltage
converter. It converts a +3V to +18V input to a
corresponding -3V to -18V output using only two low-
cost capacitors, eliminating inductors and their
associated cost, size and EMI. In addition to a wider
power supply input range (3V to 18V versus 1.5V to
10V for the TC7660), the TC7662A can source output
currents as high as 40mA. The on-board oscillator
operates at a nominal frequency of 12kHz. Operation
below 12kHz (for lower supply current applications) is
also possible by connecting an external capacitor from
OSC to ground.
The TC7662A directly is recommended for designs
requiring greater output current and/or lower input/
output voltage drop. It is available in 8-pin PDIP and
CERDIP packages in commercial and extended
temperature ranges.
GND
NC
C +
C –
TC7662A
1
2
3
4
8-Pin CERDIP
8-Pin PDIP
TC7662A
8
7
6
5
DS21468B-page 1
V
OSC
NC
V
DD
OUT

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TC7662ACPA Summary of contents

Page 1

... Packages Applications • Laptop Computers • Disk Drives • Process Instrumentation • µP-based Controllers Device Selection Table Part Package Number TC7662ACPA 8-Pin PDIP TC7662AEPA 8-Pin PDIP TC7662AIJA 8-Pin CERDIP TC7662AMJA 8-Pin CERDIP  2002 Microchip Technology Inc. Package Type General Description ...

Page 2

... Functional Block Diagram I 7 OSC + F/F C – Comparator with Hysteresis V REF DS21468B-page 2 Level Shift Q Q Level Shift Level Shift Level Shift TC7662A P SW1 2 + CAP + N SW4 C P EXT GND 3 + OUT SW2 EXT 4 – CAP SW3 5 V OUT  2002 Microchip Technology Inc. ...

Page 3

... EFF V Voltage Efficiency EFF  2002 Microchip Technology Inc. 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 ...

Page 4

... C Charge pump capacitor positive terminal. 3 GND Ground terminal Charge pump capacitor negative terminal Output voltage. OUT connection. 7 OSC Oscillator control input. Bypass with an external capacitor to slow the oscillator Power supply positive voltage input. DD DS21468B-page 4 Description  2002 Microchip Technology Inc. ...

Page 5

... TC7662A 10µ OSC  2002 Microchip Technology Inc. 3.1 Theoretical Power Efficiency Considerations In theory, a voltage converter can approach 100% efficiency if certain conditions are met: 1. The drive circuitry consumes minimal power. 2. The output switches have extremely low ON resistance and virtually no offset. . This DD 3 ...

Page 6

... SW4 CR terms see that: SWX SW 1 Ω ESR + ESR PUMP P High value capacitors will component, and low ESR PUMP term, PUMP P > 10µF and there is not enough P = 12kHz and OSC ESR + ESR ≅ ( ESR ) Ω PUMP P  2002 Microchip Technology Inc ...

Page 7

... OUT DD  2002 Microchip Technology Inc. 4.3 Paralleling Devices Any number of TC7662A voltage converters may be paralleled to reduce output resistance (Figure 4-3). The reservoir capacitor, C each device requires its own pump capacitor being dis- resultant output resistance would be approximately ...

Page 8

... OUT – V – µ OUT ( – and C perform the pump and 1 3 and C are 2 4 COMBINED NEGATIVE CONVERTER AND POSITIVE DOUBLER OUT -(V – OUT – SPLITTING A SUPPLY IN HALF 50µ – TC7662A + 3 6 – 50µF – V –  2002 Microchip Technology Inc. ...

Page 9

... TEMPERATURE (°C) Power Conversion Efficiency vs. I 110 100 90 Efficiency Supply 40 Current LOAD CURRENT (mA)  2002 Microchip Technology Inc. ≈ C ≈ 1Ω 25°C unless otherwise noted. ESRCP ESRCR A 10k 15V DD 100 100 120 140 Output Resistance vs. Temperature 160 140 120 V DD 100 80 60 ...

Page 10

... MIN. .020 (0.51) .016 (0.41) .310 (7.87) .290 (7.37) 3° MIN. .400 (10.16) .310 (7.87) Dimensions: inches (mm) .320 (8.13) .290 (7.37) 3° MIN. .400 (10.16) .320 (8.13) Dimensions: inches (mm)  2002 Microchip Technology Inc. ...

Page 11

... 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. TC7662A DS21468B-page11 ...

Page 12

... TC7662A NOTES: DS21468B-page12  2002 Microchip Technology Inc. ...

Page 13

... 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.  2002 Microchip Technology Inc. TC7662A Trademarks The Microchip name and logo, the Microchip logo, FilterLab, K ...

Page 14

... Palazzo Taurus Colleoni 1 20041 Agrate Brianza Milan, Italy Tel: 39-039-65791-1 Fax: 39-039-6899883 United Kingdom Arizona Microchip Technology Ltd. 505 Eskdale Road Winnersh Triangle Wokingham Berkshire, England RG41 5TU Tel: 44 118 921 5869 Fax: 44-118 921-5820 03/01/02 ' !" '  2002 Microchip Technology Inc. ...

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