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EVALUATION
KIT
AVAILABLE
TC7662A
CHARGE PUMP DC-TO-DC CONVERTER
GENERAL DESCRIPTION
FEATURES
The TC7662A is a pin-compatible upgrade to the In-
dustry 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 addi-
tion 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 be-
low 10kHz (for lower supply current applications) is also
possible by connecting an external capacitor from OSC to
ground.
■ Wide Operating Range ............................. 3V to 18V
■ Increased Output Current .............................. 40mA
■ Pin Compatible with ICL7662/SI7661/TC7660/
LTC1044
■ No External Diodes Required
■ Low Output Impedance @ IL = 20mA ....... 40Ω Typ.
■ No Low-Voltage Terminal Required
■ CMOS Construction
ORDERING INFORMATION
The TC7662A directly is recommended for designs
requiring greater output current and/or lower input/output
voltage drop. It is available in 8-pin DIP packages in com-
mercial and extended temperature ranges.
Temperature
Part No.
Package
Range
TC7662ACPA
TC7662AEPA
TC7662AIJA
TC7662AMJA
TC7660EV
8-Pin Plastic DIP
8-Pin Plastic DIP
8-Pin CerDIP
0°C to +70°C
– 40°C to +85°C
– 25°C to +85°C
– 55°C to +125°C
PIN CONFIGURATION
8-Pin CerDIP
1
2
3
4
8
7
6
5
VDD
NC
C+
Evaluation Kit for
OSC
Charge Pump Family
GND
NC
TC7662A
–
C
VOUT
NC = NO INTERNAL CONNECTION
FUNCTIONAL BLOCK DIAGRAM
8
V
DD
I
7
C
OSC
LEVEL
SHIFT
P SW1
N SW4
Q
2
+
+
–
F/F
CAP
C
Q
LEVEL
SHIFT
+
C
P
COMPARATOR
WITH HYSTERESIS
EXT
GND
3
V
REF
+
OUT
C
R
LEVEL
SHIFT
N SW2
N SW3
EXT
TC7662A
4
–
CAP
R
L
LEVEL
SHIFT
5
V
OUT
TC7662A-5 9/11/96
TELCOM SEMICONDUCTOR, INC.
4-77