TC7662A Datasheet, PDF (1/5 Pages) TelCom Semiconductor, Inc – CHARGE PUMP DC-TO-DC CONVERTER

EVALUATION
KIT
AVAILABLE
1
TC7662A
CHARGE PUMP DC-TO-DC CONVERTER
2
FEATURES
GENERAL DESCRIPTION
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
TC7660EV
Package
Temperature
Range
8-Pin Plastic DIP
0°C to +70°C
8-Pin Plastic DIP – 40°C to +85°C
8-Pin CerDIP
– 25°C to +85°C
8-Pin CerDIP
– 55°C to +125°C
Evaluation Kit for
Charge Pump Family
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-
3 ^{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
4 ^{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.
PIN CONFIGURATION
NC ¹
8 V_DD
C⁺ 2
7 OSC
GND 3 _TC7662A 6 NC
5
C^– 4
5 V_OUT
FUNCTIONAL BLOCK DIAGRAM
NC = NO INTERNAL CONNECTION
COSC ⁷
I
Q
+
F/F
C
–
Q
COMPARATOR
WITH HYSTERESIS
VREF
TC7662A
LEVEL
SHIFT
LEVEL
SHIFT
LEVEL
SHIFT
8 _VDD
P SW1
2 _CAP+
N SW4
+
CP
EXT
GND
3
N SW2
+
OUT
CR
EXT
4 _CAP–
RL
6
7
LEVEL
SHIFT
N SW3
5
VOUT
8
TELCOM SEMICONDUCTOR, INC.
TC7662A-5 9/11/96
4-77