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TC1240ECH Fiches technique(PDF) 10 Page - Microchip Technology

No de pièce TC1240ECH
Description  Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package
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Fabricant  MICROCHIP [Microchip Technology]
Site Internet  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1240ECH Fiches technique(HTML) 10 Page - Microchip Technology

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TC1240/TC1240A
DS21516C-page 10
 2003 Microchip Technology Inc.
5.7
Cascading Devices
Two or more TC1240/TC1240As can be cascaded to
increase output voltage (Figure 5-4). If the output is
lightly loaded, it will be close to ((n + 1) x VIN), but will
droop at least by ROUT of the first device multiplied by
the IQ of the second. It can be seen that the output
resistance rises rapidly for multiple cascaded devices.
For the case of the two-stage ‘tripler’, output resistance
can be approximated as ROUT = 2 x ROUT1 + ROUT2,
where ROUT1 is the output resistance of the first stage
and ROUT2 is the output resistance of the second stage.
5.8
Paralleling Devices
To reduce the value of ROUT, multiple TC1240/
TC1240As can be connected in parallel (Figure 5-5).
The output resistance will be reduced by a factor of N,
where N is the number of TC1240/TC1240As. Each
device will require its own pump capacitor (C1x), but all
devices may share one reservoir capacitor (C2).
However, to preserve ripple performance, the value of
C2 should be scaled according to the number of
paralled TC1240/TC1240As, respectively.
5.9
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.
FIGURE 5-4:
Cascading Multiple Devices To Increase Output Voltage.
FIGURE 5-5:
Paralleling Multiple Devices To Reduce Output Resistance.
"n"
C+
GND
C-
OUT
3
2
5
1
6
TC1240
TC1240A
SHDN
4
VIN
C+
GND
C-
OUT
C1A
3
2
5
1
6
C2B
VIN
VOUT
VOUT = (n + 1)VIN
TC1240
TC1240A
SHDN
4
"1"
+
+
+
VIN
C1B
C2A
+
C1A
C1B
6
4
2
3
2
5
1
1
5
3
C2
VOUT
VOUT = 2 x VIN
ROUT =
ROUT OF SINGLE DEVICE
VIN
NUMBER OF DEVICES
TC1240
TC1240A
TC1240
TC1240A
. . .
. . .
SHDN
SHDN
Shutdown
Control
4
6
VIN
+
+
+
"1"
"n"


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