EVALUATION
KIT
AVAILABLE
1
TC962
HIGH CURRENT CHARGE PUMP DC-TO-DC CONVERTER
FEATURES
s
s
s
s
s
s
s
s
Pin Compatible With TC7662/ICL7662/SI7661
High Output Current ....................................... 80mA
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 7662 high-voltage DC-to-DC converter. Using
improved design techniques and CMOS construction, the
TC962 can source as much as 8mA versus the 7662’s
20mA 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 7662
applications has been eliminated. Grounding this terminal
will double the oscillator frequency from 12kHz to 24kHz.
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.
2
3
4
5
6
7
PIN CONFIGURATIONS
(DIP and SOIC)
8-Pin DIP
8-Pin CerDIP
ZENER
CATHODE
+
C
GND
–
C
1
2
3
4
•
TC962CPA
TC962EPA
TC962IJA
TC962MJA
8
7
6
5
VDD
COSC
FREQ x 2
V
OUT
16-Pin SOIC Wide
ZENER
CATHODE
NC
C+
NC
GND
NC
1
2
3
4
5
6
7
8
16
15
14
13
VDD
NC
COSC
NC
FREQ x 2
NC
V
OUT
NC
TC962COE
12
11
10
9
ORDERING INFORMATION
Part No.
TC962COE
TC962CPA
TC962EPA
TC962IJA
TC962MJA
TC7660EV
C
–
NC
Package
Temp. Range
16-Pin SOIC Wide
0°C to +70°C
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
VDD
TC962
FUNCTIONAL BLOCK DIAGRAM
8
FREQ X 2
–
OSC/C
TIMING
6
7
LEVEL
SHIFT
P SW1
2
CAP
+
I
I
Q
+
–
F/F
C
Q
COMPARATOR
WITH HYSTERESIS
LEVEL
SHIFT
N SW4
+
CP
EXTERNAL
3 GND
ZENER
CATHODE
1
6.4V
VREF
+
LEVEL
SHIFT
OUT
N SW2
4
–
CR
EXT
CAP
RL
LEVEL
SHIFT
N SW3
5
VOUT
8
TC962-8 9/16/96
TELCOM SEMICONDUCTOR, INC.
4-37
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
