TC962
High Current Charge Pump DC-to-DC Converter
Features:
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Pin Compatible With TC7662/ICL7662/SI7661
High Output Current 80 mA
No External Diodes Required
Wide Operating Range 3V to 18V
Low Output Impedance 28Ω 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
28Ω (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 12Ω 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
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:
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Laptop Computers
Disk Drives
Process Instrumentation
μP-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
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-25°C to +85°C
-55°C to +125°C
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 V
DD
7 C
OSC
6 FREQ x 2
5 V
OUT
Zener
Cathode 1
NC 2
C+ 3
NC 4
GND 5
NC 6
C– 7
NC 8
16 V
DD
15 NC
14 C
OSC
13 NC
TC962COE
12 FREQ x 2
11 NC
10 V
OUT
9 NC
©
2006 Microchip Technology Inc.
DS21484C-page 1
MICROCHIP [ MICROCHIP TECHNOLOGY ]
