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LTC1473L Fiches technique(PDF) 11 Page - Linear Technology

No de pièce LTC1473L
Description  Dual Low Voltage PowerPath Switch Driver
PDF  16 Pages
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Fabricant  LINER [Linear Technology]
Site Internet  http://www.linear.com
Logo LINER - Linear Technology

LTC1473L Fiches technique(HTML) 11 Page - Linear Technology

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LTC1473L
11
VGG Regulator Inductor and Capacitors
The VGG regulator provides a power supply voltage signifi-
cantly higher than either of the two main power source
voltages to allow the control of N-channel MOSFET
switches. This micropower, step-up voltage regulator is
powered by the higher potential available from the two
main power sources for maximum regulator efficiency.
APPLICATIO S I FOR ATIO
Three external components are required by the VGG regu-
lator: L1, C1 and C2, as shown in Figure 5.
L1 is a small, low current, 1mH surface mount inductor. C1
provides filtering to the input of the 1mH switched induc-
tor and should be at least 1
µF to filter switching transients.
The VGG output capacitor, C2, provides storage and filter-
ing for the VGG output and should be at least 1µF and rated
for 25V operation. C1 and C2 can be ceramic capacitors.
Figure 5. VGG Step-Up Switching Regulator
BAT1
DCIN
VGG
SWITCHING
REGULATOR
V+
SW
GND
1473 F05
VGG
L1*
1mH
C1
1
µF
25V
C2
1
µF
25V
TO GATE
DRIVERS
(8.5V + V+)
LTC1473L
*COILCRAFT 1812LS-105 XKBC. (708) 639-6400



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