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LT1933 Datasheet

  • LT1933

  • 600mA, 500kHz Step-Down Switching Regulator in SOT-23

  • LINER

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LT1933
should be placed on the same side of the circuit board, and
their connections should be made on that layer. Place a
local, unbroken ground plane below these components,
and tie this ground plane to system ground at one location,
ideally at the ground terminal of the output capacitor C1.
The SW and BOOST nodes should be as small as possible.
Finally, keep the FB node small so that the ground pin and
ground traces will shield it from the SW and BOOST nodes.
Include two vias near the GND pin of the LT1933 to help
remove heat from the LT1933 to the ground plane.
High Temperature Considerations
The die temperature of the LT1933 must be lower than the
maximum rating of 125擄C. This is generally not a concern
unless the ambient temperature is above 85擄C. For higher
temperatures, care should be taken in the layout of the
circuit to ensure good heat sinking of the LT1933. The
maximum load current should be derated as the ambient
temperature approaches 125擄C.
The die temperature is calculated by multiplying the LT1933
power dissipation by the thermal resistance from junction
to ambient. Power dissipation within the LT1933 can be
estimated by calculating the total power loss from an
efficiency measurement and subtracting the catch diode
loss. The resulting temperature rise at full load is nearly
independent of input voltage. Thermal resistance depends
on the layout of the circuit board, but a value of 125擄C/W
is typical.
Die temperature rise was measured on a two-layer, five by
five cm circuit board in still air. The LT1933 producing 5V
at 500mA showed a temperature rise of 28擄C, allowing it
to deliver full load to 97擄C ambient. Above this tempera-
ture the load current should be reduced. For 3.3V at
500mA the temperature rise is 24擄C.
Other Linear Technology Publications
Application notes AN19, AN35 and AN44 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 DN100 shows how to generate a bipolar output
supply using a Buck regulator.
TYPICAL APPLICATIO S
1.8V Step-Down Converter
D2
V
IN
6.3V TO 36V
5
V
IN
3.6V TO 20V
5
V
IN
BOOST
LT1933
1
C3
0.1碌F
L1
10碌H
V
OUT
1.8V/500mA
OFF ON
4
SHDN
GND
2
SW
FB
3
R2
10k
6
R1
4.42k
C2
2.2碌F
3.3V Step-Down Converter
V
IN
4.5V TO 36V
5
V
IN
BOOST
LT1933
OFF ON
4
SHDN
GND
2
C2
2.2碌F
SW
FB
3
R2
10k
6
R1
16.5k
1
C3
0.1碌F
D2
V
IN
14.5V TO 36V
5
14
U
D1
5V Step-Down Converter
V
IN
BOOST
LT1933
OFF ON
4
SHDN
GND
2
C2
2.2碌F
SW
FB
3
R2
10k
6
R1
30.1k
1
C3
0.1碌F
D2
L1
33碌H
V
OUT
5V/500mA
D1
C1
22碌F
6.3V
1933 TA02c
C1
22碌F
2x
1933 TA02a
12V Step-Down Converter
V
IN
BOOST
LT1933
1
D3, 6V
C3
0.1碌F
D2
L1
47碌H
V
OUT
12V/450mA
L1
22碌H
V
OUT
3.3V/500mA
OFF ON
4
SHDN
GND
2
SW
FB
3
R2
10k
6
R1
86.6k
D1
D1
C1
22碌F
6.3V
1933 TA02b
C2
2.2碌F
C1
10碌F
1933 TA02d
1933f

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LT1933ES6,LT1933IS6

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