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LT3971 Datasheet(PDF) 19 Page - Linear Technology

Part # LT3971
Description  38V, 1.2A, 2MHz Step-Down Regulator with 2.8 Quiescent Current
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3971 Datasheet(HTML) 19 Page - Linear Technology

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LT3971
19
3971f
APPLICATIONS INFORMATION
5V Step-Down Converter
3.3V Step-Down Converter
SW
FB
SS
RT
VIN
VIN
7V TO 38V
VOUT
5V
1.2A
4.7μF
0.47μF
22μF
10pF
309k
49.9k
f = 800kHz
4.7μH
1M
GND
BD
SYNC
OFF ON
LT3971
3971 TA02
EN
BOOST
PG
10pF
SW
FB
SS
RT
VIN
VIN
4.3V TO 38V
VOUT
3.3V
1.2A
4.7μF
0.47μF
22μF
562k
71.5k
f = 600kHz
4.7μH
1M
GND
BD
SYNC
OFF ON
LT3971
3971 TA03
EN
BOOST
PG
TYPICAL APPLICATIONS
loss. The die temperature is calculated by multiplying the
LT3971 power dissipation by the thermal resistance from
junction to ambient.
Also keep in mind that the leakage current of the power
Schottky diode goes up exponentially with junction tem-
perature. When the power switch is closed, the power
Schottky diode is in parallel with the power converter’s
output filter stage. As a result, an increase in a diode’s
leakage current results in an effective increase in the load,
and a corresponding increase in input power. Therefore,
the catch Schottky diode must be selected with care to
avoid excessive increase in light load supply current at
high temperatures.
Other Linear Technology Publications
Application Notes 19, 35 and 44 contain more detailed
descriptions and design information for buck regulators
and other switching regulators. The LT1376 data sheet
has a more extensive discussion of output ripple, loop
compensation and stability testing. Design Note 318
shows how to generate a bipolar output supply using a
buck regulator.



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