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TC1240ECH データシート(PDF) 5 Page - TelCom Semiconductor, Inc

部品番号 TC1240ECH
部品情報  Positive Doubling Charge Pump with Shutdown in SOT Package
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メーカー  TELCOM [TelCom Semiconductor, Inc]
ホームページ  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC1240ECH データシート(HTML) 5 Page - TelCom Semiconductor, Inc

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5
TC1240
Positive Doubling Charge Pump with
Shutdown in SOT Package
TC1240-1 7/7/00
Figure 5. Paralleling Multiple Devices to Reduce Output Resistance
C1A
C1B
6
6
2
3
2
5
1
1
5
3
C2
V
OUT
V
OUT = 2 x VIN
R
OUT =
R
OUT
OF SINGLE DEVICE
V
IN
NUMBER OF DEVICES
TC1240
"1"
TC1240
"n"
. . .
. . .
SHDN
SHDN
Shutdown
Control
4
4
V
IN
PARALLELING DEVICES
To reduce the value of ROUT, multiple TC1240s can be
connected in parallel (Figure 5). The output resistance will
be reduced by a factor of N where N is the number of
TC1240s. Each device will require its own pump capacitor
(C1x), but all devices may share one resevoir capacitor (C2).
However, to preserve ripple performance the value of C2
should be scaled according to the number of paralleled
TC1240s.
LAYOUT CONSIDERATIONS
As with any switching power supply circuit good layout
practice is recommended. Mount components as close
together as possible to minimize stray inductance and
capacitance. Also use a large ground plane to minimize
noise leakage into other circuitry.
TC1240 DEMO CARD
The TC1240 Demo Card is a 1.25” x 1.0” card contain-
ing a TC1240 and all of the necessary external components
that allow the user to evaluate the device’s ability to gener-
ate a 2X non-regulated output voltage. The demo card is
fully assembled with the required external capacitors along
with a variable load resistor that allows the user to vary the
output load current of the output stage. For convenience,
several test points and jumpers are available for measuring
various voltages and currents on the circuit board.
Figure 6. TC1240 Demo Card Schematic


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