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Número de pieza | TCM680EPA | |
Descripción | +5V TO 10V VOLTAGE CONVERTER | |
Fabricantes | TelCom Semiconductor | |
Logotipo | ||
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No Preview Available ! EVALUATION
KIT
AVAILABLE
1
TCM680
+5V TO ±10V VOLTAGE CONVERTER
FEATURES
s 99% Voltage Conversion Efficiency
s 85% Power Conversion Efficiency
s Wide Voltage Range ......................... +2.0V to +5.5V
s Only 4 External Capacitors Required
s Space Saving 8-Pin SOIC Design
APPLICATIONS
s ±10V From +5V Logic Supply
s ±6V From a 3V Lithium Cell
s Handheld Instruments
s Portable Cellular Phones
s LCD Display Bias Generator
s Panel Meters
s Operational Amplifier Power Supplies
GENERAL DESCRIPTION
The TCM680 is a dual charge pump voltage converter
that develops output voltages of +2VIN and – 2VIN 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
PIN CONFIGURATIONS (DIP AND SOIC)
C1–
C+2
C2–
VO–UT
1
2
3
4
TCM680CPA
TCM680EPA
8 VO+UT
7 C+1
6 VIN
5 GND
C1–
C+2
C2–
VO–UT
1
2
3
4
8 VO+UT
7 C+1
TCM680COA 6
TCM680EOA
VIN
5 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
5
6
TYPICAL OPERATING CIRCUIT
+5V
C1 +
4.7µF
C2 +
4.7µF
GND
2.0V<VIN < +5.5V
C+1
VIN
4.7µF
VO+UT
C4
+
VO+UT = ( 2 x VIN)
C1–
C+2 TCM680
VO–UT
C2–
GND
4.7µF
VO–UT = (– 2 x VIN)
C3
+
GND
TELCOM SEMICONDUCTOR, INC.
7
8
TC660-2 9/4/96
4-13
1 page +5V TO ±10V VOLTAGE CONVERTER
1
Table 1. ROUT vs. C1 ,C2
C1, C2 (µF)
0.1
0.47
1
3.3
4.7
10
22
100
ROUT (Ω)
1089
339
232
165
157
146
141
137
Table 2. VRIPPLE (p-p) vs. C3, C4 (IOUT = 10mA)
C3, C4 (µF)
VRIPPLE (mV)
0.47 1540
1 734
3.3 236
4.7 172
10 91
22 52
100 27
TCM680
Paralleling Devices
Paralleling multiple TCM680s reduces the output resis-
tance of both the positive and negative converters. The
effective output resistance is the output resistance of a
single device divided by the number of devices. As illus-
trated in Figure 7, each requires separate pump capacitors
C1 and C2, but all can share a single set of reservoir
capacitors.
±5V Regulated Supplies From A Single
3V Battery
Figure 8 shows a complete ±5V power supply using one
3V battery. The TCM680 provides +6V at V+OUT, which is
regulated to +5V by the TC55, and –5V by the negative LDO.
The input to the TCM680 can vary from 3V to 6V without
affecting regulation appreciably. With higher input voltage,
more current can be drawn from the outputs of the TCM680.
With 5V at VIN, 10mA can be drawn from both regulated
outputs simultaneously. Assuming 150Ω source resistance
for both converters, with (I+L + IL) = 20mA, the positive charge
pump will droop 3V, providing +7V for the negative charge
pump.
2
3
4
5
VIN
+
10µF
–
+
10µF
–
GND
C1+ VIN
C1–
TCM680
C2+
C2– GND
VO–UT
+
10µF
–
+
10µF
–
C1+ VIN
C1–
TCM680
C2+
C2– GND
VO–UT
6
NEGATIVE
SUPPLY
–
+ CO–UT 22µF
7
Figure 7. Paralleling TCM680 for Lower Output Source Resistance
TELCOM SEMICONDUCTOR, INC.
8
4-17
5 Page |
Páginas | Total 7 Páginas | |
PDF Descargar | [ Datasheet TCM680EPA.PDF ] |
Número de pieza | Descripción | Fabricantes |
TCM680EPA | +5V TO 10V VOLTAGE CONVERTER | TelCom Semiconductor |
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