TC7662A Datasheet, PDF (1/7 Pages) TelCom Semiconductor, Inc – CHARGE PUMP DC-TO-DC CONVERTER

EVALUATION
KIT
AVAILABLE
TC7662A
CHARGE PUMP DC-TO-DC CONVERTER
FEATURES
s Wide Operating Range ............................. 3V to 18V
s Increased Output Current .............................. 40mA
s Pin Compatible with ICL7662/SI7661/TC7660/
LTC1044
s No External Diodes Required
s Low Output Impedance @ I_L = 20mA ....... 40Ω Typ.
s No Low-Voltage Terminal Required
s CMOS Construction
ORDERING INFORMATION
Part No.
TC7662ACPA
TC7662AEPA
TC7662AIJA
TC7662AMJA
Package
8-Pin Plastic DIP
8-Pin Plastic DIP
8-Pin CerDIP
8-Pin CerDIP
Temperature
Range
0°C to +70°C
– 40°C to +85°C
– 25°C to +85°C
– 55°C to +125°C
GENERAL DESCRIPTION
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.
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.
PIN CONFIGURATION
PDIP/CerDIP
NC ¹
C⁺ 2
8 V_DD
7 OSC
GND 3 _TC7662A 6 NC
C^– 4
5 V_OUT
FUNCTIONAL BLOCK DIAGRAM
NC = NO INTERNAL CONNECTION
COSC ⁷
I
Q
+
F/F
C
–
Q
COMPARATOR
WITH HYSTERESIS
VREF
LEVEL
SHIFT
LEVEL
SHIFT
8 _VDD
TC7662A
P SW1
2 _CAP+
N SW4
+
CP
EXT
GND
3
LEVEL
SHIFT
LEVEL
SHIFT
N SW2
+
OUT
CR
EXT
4 _CAP–
RL
N SW3
5
VOUT
© 2001 Microchip Technology Inc. DS21468
TC7662A-5 9/11/96