ltc1473l Linear Technology Corporation, ltc1473l Datasheet - Page 11

• Manufacturer Part Number: ltc1473l
• Description: Dual Low Voltage Powerpath Switch Driver
• Manufacturer: Linear Technology Corporation

APPLICATIO S I FOR ATIO
V
The V
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.
GG
Regulator Inductor and Capacitors
GG
regulator provides a power supply voltage signifi-
U
U
*COILCRAFT 1812LS-105 XKBC. [phone]
W
LTC1473L
DRIVERS
TO GATE
Figure 5. V
REGULATOR
SWITCHING
U
V
(8.5V + V
GG
GG
Step-Up Switching Regulator
+
)
Three external components are required by the V
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 F to filter switching transients.
The V
ing for the V
for 25V operation. C1 and C2 can be ceramic capacitors.
V
SW
GND
V
GG
+
GG
DCIN
output capacitor, C2, provides storage and filter-
L1*
1mH
BAT1
GG
C2
1 F
25V
output and should be at least 1 F and rated
1473 F05
C1
1 F
25V
LTC1473L
GG
11
regu-