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LTC1044AC Datasheet PDF : 14 Pages
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LTC1044A
Applications Information
Battery Splitter
A common need in many systems is to obtain (+) and
(–) supplies from a single battery or single power supply
system. Where current requirements are small, the circuit
shown in Figure 9 is a simple solution. It provides sym-
metrical ± output voltages, both equal to one half input
voltage. The output voltages are both referenced to pin 3
(output common). If the input voltage between pin 8 and
pin 5 is less than 6V, pin 6 should also be connected to
pin 3 as shown by the dashed line.
+
VB
12V
1
2
C1 3
10µF 4
LTC1044A
8
+VB/2 (6V)
7
6
REQUIRED FOR VB < 6V
5
+VB/2 (–6V)
Figure 9. Battery Splitter
C2
10µF
OUTPUT
COMMON
1044a F09
Paralleling for Lower Output Resistance
Additional flexibility of the LTC1044A is shown in Figures
10 and 11.
Figure 10 shows two LTC1044As connected in parallel to
provide a lower effective output resistance. If, however,
the output resistance is dominated by 1/(f • C1), increasing
the capacitor size (C1) or increasing the frequency will be
of more benefit than the paralleling circuit shown.
Figure 11 makes use of stacking two LTC1044As to pro-
vide even higher voltages. A negative voltage doubler or
tripler can be achieved, depending upon how pin 8 of the
second LTC1044A is connected, as shown schematically
by the switch. The available output current will be dictated/
decreased by the product of the individual power conver-
sion efficiencies and the voltage step-up ratio.
V+
C1
10µF
1
8
2
7
3 LTC1044A 6
4
5
C1
10µF
1
8
2
7
3 LTC1044A 6
4
5
VOUT = –(V+)
1/4 CD4077
*
C2
20µF
*THE EXCLUSIVE NOR GATE SYNCHRONIZES BOTH LTC1044As TO MINIMIZE RIPPLE
Figure 10. Paralleling for Lower Output Resistance
1044a F10
V+
FOR VOUT = –3V+
FOR VOUT = –2V+
1
8
2
7
10µF 3 LTC1044A 6
4
5
10µF 1
8
+2
7
3 LTC1044A 6
– (V+)
4
5
10µF
Figure 11. Stacking for Higher Voltage
VOUT
10µF
1044a F11
For more information www.linear.com/LTC1044A
1044afa
9
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