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EVALUATION
KIT
AVAILABLE
TC1044S
CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
FEATURES
GENERAL DESCRIPTION
■ Converts +5V Logic Supply to ±5V System
■ Wide Input Voltage Range ....................1.5V to 12V
■ Efficient Voltage Conversion......................... 99.9%
■ Excellent Power Efficiency ............................... 98%
■ Low Power Consumption ............ 80µA @ VIN = 5V
■ Low Cost and Easy to Use
The TC1044S is a pin-compatible upgrade to the Indus-
try standard TC7660 charge pump voltage converter. It
converts a +1.5V to +12V input to a corresponding –1.5V
to –12V output using only two low cost capacitors, eliminat-
ing inductors and their associated cost, size and EMI.
Added features include an extended supply range to 12V,
and a frequency boost pin for higher operating frequency,
allowing the use of smaller external capacitors.
Theon-boardoscillatoroperatesatanominalfrequency
of 10kHz. Frequency is increased to 45kHz when pin 1 is
connected to V+. Operation below 10kHz (for lower supply
current applications) is possible by connecting an external
capacitor from OSC to ground (with pin 1 open).
— Only Two External Capacitors Required
■ RS-232 Negative Power Supply
■ Available in 8-Pin Small Outline (SOIC) and 8-Pin
Plastic DIP Packages
■ Improved ESD Protection ..................... Up to 10kV
■ No External Diode Required for High Voltage
Operation
■ Frequency Boost Raises FOSC to 45kHz
The TC1044S is available in both 8-pin DIP and
8-pin small outline (SOIC) packages in commercial and
extended temperature ranges.
PIN CONFIGURATION (DIP and SOIC)
ORDERING INFORMATION
Part No.
Package
Temp. Range
TC1044SCOA
TC1044SCPA
TC1044SEOA
TC1044SEPA
TC1044SIJA
TC1044SMJA
TC7660EV
8-Pin SOIC
0°C to +70°C
0°C to +70°C
+
+
BOOST
1
2
3
4
8
7
6
5
BOOST
1
2
3
4
8
7
6
5
V
V
+
+
8-Pin Plastic DIP
8-Pin SOIC
CAP
GND
CAP
GND
OSC
OSC
TC1044SCPA
TC1044SEPA
TC1044SIJA
TC1044SMJA
LOW
VOLTAGE (LV)
LOW
VOLTAGE (LV)
TC1044SCOA
TC1044SEOA
– 40°C to +85°C
– 40°C to +85°C
– 25°C to +85°C
– 55°C to +125°C
–
–
V
V
8-Pin Plastic DIP
8-Pin CerDIP
8-Pin CerDIP
CAP
CAP
OUT
OUT
Charge Pump Family Evaluation Kit
FUNCTIONAL BLOCK DIAGRAM
+
+
CAP
V
8
2
1
BOOST
VOLTAGE–
LEVEL
TRANSLATOR
7
6
RC
OSCILLATOR
4
2
–
OSC
LV
CAP
5
V
OUT
INTERNAL
VOLTAGE
REGULATOR
LOGIC
NETWORK
TC1044S
3
GND
TC1044S-12 9/16/96
TELCOM SEMICONDUCTOR, INC.
4-43