TC7660S
TC7660S-14 9/16/96
EVALUATION
KIT
AVAILABLE
© 2001 Microchip Technology Inc. DS21467A
FEATURES
■
Oscillator boost from 10kHz to 45kHz
■
Co5V Logic Supply to
±
5V System
■
Wide Input Voltage Range .................... 1.5V to 12V
■
Efficient Voltage Conversion ......................... 99.9%
■
Excellent Power Efficiency ............................... 98%
■
Low Power Supply .............................. 80
µ
A @ 5 V
IN
■
Low Cost and Easy to Use
— Only Two External Capacitors Required
■
Available in Small Outline (SOIC) Package
■
Improved ESD Protection ..................... Up to 10kV
■
No External Diode Required for High Voltage
Operation
GENERAL DESCRIPTION
The TC7660S 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, 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 TC7660S is available in both 8-pin DIP and 8-pin
small outline (SOIC) packages in commercial and extended
temperature ranges.
FUNCTIONAL BLOCK DIAGRAM
TC7660S
GND
INTERNAL
VOLTAGE
REGULATOR
RC
OSCILLATOR
VOLTAGE–
LEVEL
TRANSLATOR
÷
2
V + CAP +
8
2
7
6
OSC
LV
3
LOGIC
NETWORK
VOUT
5
CAP –
4
1
BOOST
SUPER CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
PIN CONFIGURATION (DIP AND SOIC)
1
2
3
4
8
7
6
5
TC7660SCPA
TC7660SEJA
TC7660SEPA
TC7660SCOA
TC7660SEOA
Boost
CAP +
GND
CAP –
Boost
CAP +
GND
CAP
–
VOUT
LOW
VOLTAGE (LV)
OSC
+
V
VOUT
LOW
VOLTAGE (LV)
OSC
+
V
1
2
3
4
8
7
6
5
ORDERING INFORMATION
Temperature
Part No.
Package
Range
TC7660SCOA
8-Pin SOIC
0
°
C to +70
°
C
TC7660SCPA
8-Pin Plastic DIP
0
°
C to +70
°
C
TC7660SEJA
8-Pin CerDIP
– 40
°
C to +85
°
C
TC7660SEOA
8-Pin SOIC
– 40
°
C to +85
°
C
TC7660SEPA
8-Pin Plastic DIP
– 40
°
C to +85
°
C
TC7660SMJA
8-Pin CerDIP
– 55
°
C to +125
°
C
TC7660EV
Evaluation Kit for
Charge Pump Family
