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ISL97519A Datasheet(PDF) 8 Page - Intersil Corporation

Part No. ISL97519A
Description  600kHz/1.2MHz PWM Step-Up Regulator
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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ISL97519A Datasheet(HTML) 8 Page - Intersil Corporation

   
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8
FN6683.2
June 30, 2008
Cascaded MOSFET Application
A 25V N-Channel MOSFET is integrated in the boost
regulator. For applications where the output voltage is
greater than 25V, an external cascaded MOSFET is needed
as shown in Figure 14. The voltage rating of the external
MOSFET should be greater than AVDD.
DC PATH BLOCK APPLICATION
Note that there is a DC path in the boost converter from the
input to the output through the inductor and diode. The input
voltage will be seen at the output less a forward voltage drop
of the diode before the part is enabled. If this direct
connection is not desired, the following circuit can be
inserted between input and inductor to disconnect the DC
path when the part is disabled (see Figure 15).
TABLE 1. TYPICAL MAXIMUM IOUT VALUES
VIN (V)
VOUT (V)
IOMAX (mA)
3.3
5
1150
3.3
9
655
3.3
12
500
5
9
990
5
12
750
FIGURE 14. CASCADED MOSFET TOPOLOGY FOR HIGH
OUTPUT VOLTAGE APPLICATIONS
INTERSIL
ISL97519A
LX
FB
AVDD
VIN
FIGURE 15. CIRCUIT TO DISCONNECT THE DC PATH OF
BOOST CONVERTER
INPUT
EN
TO INDUCTOR
ISL97519A


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