TC7662A_02 Datasheet, PDF (1/14 Pages) Microchip Technology – Charge Pump DC-to-DC Converter

M
TC7662A
Charge Pump DC-to-DC Converter
Features
• Wide Operating Range
- 3V to 18V
• Increased Output Current (40mA)
• Pin Compatible with ICL7662/SI7661/TC7660/
LTC1044
• No External Diodes Required
• Low Output Impedance @ I_L = 20mA
- 40Ω Typ.
• No Low-Voltage Terminal Required
• CMOS Construction
• Available in 8-Pin PDIP and 8-Pin CERDIP
Packages
Applications
• Laptop Computers
• Disk Drives
• Process Instrumentation
• µP-based Controllers
Device Selection Table
Part
Number
TC7662ACPA
TC7662AEPA
TC7662AIJA
TC7662AMJA
Package
8-Pin PDIP
8-Pin PDIP
8-Pin CERDIP
8-Pin CERDIP
Operating
Temp.
Range
0°C to +70°C
-40°C to +85°C
-25°C to +85°C
-55°C to +125°C
Package Type
8-Pin PDIP
8-Pin CERDIP
NC ¹
8 _VDD
C+ 2
7 OSC
TC7662A
GND 3
6 NC
C– 4
5 ^V_OUT
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.
 2002 Microchip Technology Inc.
DS21468B-page 1