EVALUATION
KIT
AVAILABLE
TC1044S
Charge Pump DC-TO-DC Voltage Converter
FEATURES
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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
— 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 a pin-compatible upgrade to the Industry 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, eliminating 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.
The on-board oscillator operates at a nominal frequency
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).
The TC1044S is available in both 8-pin DIP and
8-pin small outline (SOIC) packages in commercial and
extended temperature ranges.
ORDERING INFORMATION
PIN CONFIGURATION (DIP AND SOIC)
Part No.
8 V+
CAP + 2 TC1044SCOA 7 OSC
TC1044SEOA
GND 3
6 LOW
VOLTAGE (LV)
5 VOUT
CAP – 4
CAP + 2 TC1044SCPA 7 OSC
TC1044SEPA
GND 3 TC1044SIJA 6 LOW
VOLTAGE (LV)
TC1044SMJA
5 VOUT
CAP – 4
TC1044SCPA
8-Pin Plastic DIP
TC1044SEOA
8-Pin SOIC
– 40°C to +85°C
TC1044SEPA
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
TC7660EV
BOOST 1
8-Pin SOIC
TC1044SMJA
8 V+
TC1044SCOA
TC1044SIJA
BOOST 1
Package
Temp. Range
Charge Pump Family Evaluation Kit
0°C to +70°C
0°C to +70°C
FUNCTIONAL BLOCK DIAGRAM
V+
8
BOOST
OSC
LV
CAP +
2
1
7
RC
OSCILLATOR
2
VOLTAGE–
LEVEL
TRANSLATOR
4
CAP –
6
5
VOUT
INTERNAL
VOLTAGE
REGULATOR
LOGIC
NETWORK
TC1044S
3
GND
© 2001 Microchip Technology Inc.
DS21348A
TC1044S-12 9/16/96
