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TC962CPA Fiches technique(PDF) 1 Page - Microchip Technology

No de pièce TC962CPA
Description  High Current Charge Pump DC-to-DC Converter
Download  12 Pages
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Fabricant  MICROCHIP [Microchip Technology]
Site Internet  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC962CPA Fiches technique(HTML) 1 Page - Microchip Technology

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 2002 Microchip Technology Inc.
DS21484B-page 1
M
TC962
Features
• Pin Compatible With TC7662/ICL7662/SI7661
• High Output Current 80mA
• No External Diodes Required
• Wide Operating Range 3V to 18V
• Low Output Impedance 28
Ω Typ.
• No Low Voltage Terminal Required
• Application Zener On-Chip
• OSC Frequency Doubling Pin Option for Smaller
Output Capacitors
Applications
• Laptop Computers
• Disk Drives
• Process Instrumentation
µP-Based Controllers
Device Selection Table
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 80mA
versus the 7662’s 20mA 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
Ω (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
12kHz to 24kHz. 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 5mA) has a dynamic impedance of 12
Ω 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).
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
Part
Number
Package
Operating
Temp.
Range
TC962COE
16-Pin SOIC Wide
0°C to +70°C
TC962CPA
8-Pin Plastic DIP
0°C to +70°C
TC962EPA
8-Pin Plastic DIP
-40°C to +85°C
TC962IJA
8-Pin CERDIP
-25°C to +85°C
TC962MJA
8-Pin CERDIP
-55°C to +125°C
1
2
3
4
8
7
6
5
FREQ x 2
GND
TC962CPA
TC962EPA
TC962IJA
TC962MJA
C+
C–
VOUT
8-Pin CERDIP
8-Pin DIP
Zener
Cathode
COSC
VDD
VDD
1
2
3
4
5
6
7
8
16
13
12
11
10
9
NC
GND
COSC
NC
15
14
NC
NC
NC
TC962COE
NC
NC
Zener
Cathode
NC
FREQ x 2
16-Pin SOIC Wide
C+
C–
VOUT
High Current Charge Pump DC-to-DC Converter


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