EVALUATION
KIT
AVAILABLE
1
TCM680
+5V TO
±
10V VOLTAGE CONVERTER
FEATURES
s
s
s
s
s
99% Voltage Conversion Efficiency
85% Power Conversion Efficiency
Wide Voltage Range ......................... +2.0V to +5.5V
Only 4 External Capacitors Required
Space Saving 8-Pin SOIC Design
GENERAL DESCRIPTION
The TCM680 is a dual charge pump voltage converter
that develops output voltages of +2V
IN
and – 2V
IN
from a
single input voltage of +2.0V to +5.5V. Common applica-
tions include
±10V
from a single +5V logic supply, and
±6V
from a +3V lithium battery.
The TCM680 is packaged in a space-saving 8-pin
SOIC package and requires only four inexpensive external
capacitors. The charge pumps are clocked by an on-board
8kHz oscillator. Low output source impedances (typically
150Ω) provides maximum output currents of 10mA for each
output. Typical power conversion efficiency is 85%.
High efficiency, small installed size and low cost make
the TCM680 suitable for a wide variety of applications that
need both positive and negative power supplies derived
from a single input voltage.
2
3
4
5
6
7
APPLICATIONS
s
s
s
s
s
s
s
±
10V From +5V Logic Supply
±
6V From a 3V Lithium Cell
Handheld Instruments
Portable Cellular Phones
LCD Display Bias Generator
Panel Meters
Operational Amplifier Power Supplies
PIN CONFIGURATIONS
(DIP AND SOIC)
–
C
1
+
C
2
–
C
2
V
OUT
–
1
2
3
4
TCM680CPA
TCM680EPA
8
7
6
5
+
V
OUT
+
C
1
V
IN
GND
ORDERING INFORMATION
Part No.
TCM680COA
TCM680CPA
TCM680EOA
TCM680EPA
TC7660EV
Package
Temperature
8-Pin SOIC
0°C to +70°C
8-Pin Plastic DIP
0°C to +70°C
8-Pin SOIC
– 40°C to +85°C
8-Pin Plastic DIP
– 40°C to +85°C
Charge Pump Family
Evaluation Kit
C
1
–
+
C
2
C–
2
1
2
3
4
TCM680COA
TCM680EOA
8
7
6
5
+
V
OUT
+
C
1
V
IN
GND
–
V
OUT
TYPICAL OPERATING CIRCUIT
2.0V<V
IN
< +5.5V
+5V
+
C
1
C
–
1
V
IN
V
OUT
+
4.7µF
C1
4.7µF
+
+
C4
V
OUT
= ( 2 x V
IN
)
+
+
C2
4.7µF
+
C
2
TCM680
C
–
2
–
V
OUT
GND
4.7µF
+
C3
–
V
OUT
= (– 2 x V
IN
)
GND
GND
TC660-2 9/4/96
8
4-13
TELCOM SEMICONDUCTOR, INC.
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
