EVALUATION
KIT
AVAILABLE
1
TCM680
+5V TO
鹵
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 鈥?2V
IN
from a
single input voltage of +2.0V to +5.5V. Common applica-
tions include
鹵10V
from a single +5V logic supply, and
鹵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
150鈩? 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.
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3
4
5
6
7
APPLICATIONS
s
s
s
s
s
s
s
鹵
10V From +5V Logic Supply
鹵
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)
鈥?/div>
C
1
+
C
2
鈥?/div>
C
2
V
OUT
鈥?/div>
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擄C to +70擄C
8-Pin Plastic DIP
0擄C to +70擄C
8-Pin SOIC
鈥?40擄C to +85擄C
8-Pin Plastic DIP
鈥?40擄C to +85擄C
Charge Pump Family
Evaluation Kit
C
1
鈥?/div>
+
C
2
C鈥?/div>
2
1
2
3
4
TCM680COA
TCM680EOA
8
7
6
5
+
V
OUT
+
C
1
V
IN
GND
鈥?/div>
V
OUT
TYPICAL OPERATING CIRCUIT
2.0V<V
IN
< +5.5V
+5V
+
C
1
C
鈥?/div>
1
V
IN
V
OUT
+
4.7碌F
C1
4.7碌F
+
+
C4
V
OUT
= ( 2 x V
IN
)
+
+
C2
4.7碌F
+
C
2
TCM680
C
鈥?/div>
2
鈥?/div>
V
OUT
GND
4.7碌F
+
C3
鈥?/div>
V
OUT
= (鈥?2 x V
IN
)
GND
GND
TC660-2 9/4/96
8
4-13
TELCOM SEMICONDUCTOR, INC.
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