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LT1933 Datasheet

  • LT1933

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

  • LINER

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LT1933
APPLICATIO S I FOR ATIO
At light loads, the inductor current becomes discontinu-
ous and the effective duty cycle can be very high. This
reduces the minimum input voltage to approximately
300mV above V
OUT
. At higher load currents, the inductor
current is continuous and the duty cycle is limited by the
maximum duty cycle of the LT1933, requiring a higher
input voltage to maintain regulation.
Soft-Start
The SHDN pin can be used to soft-start the LT1933,
reducing the maximum input current during start up. The
SHDN pin is driven through an external RC filter to create
a voltage ramp at this pin. Figure 4 shows the start up
waveforms with and without the soft-start circuit. By
choosing a large RC time constant, the peak start up
current can be reduced to the current that is required to
regulate the output, with no overshoot. Choose the value
of the resistor so that it can supply 60碌A(chǔ) when the SHDN
pin reaches 2.3V.
RUN
SHDN
GND
1933 F04a
RUN
15k
SHDN
0.1碌F
GND
1933 F04b
Figure 4. To Soft-Start the LT1933, Add a Resistor and Capacitor to the SHDN Pin.
V
IN
= 12V, V
OUT
= 3.3V, C
OUT
= 22碌F, R
LOAD
= 10鈩?
1933f
U
Shorted and Reversed Input Protection
If the inductor is chosen so that it won鈥檛 saturate exces-
sively, an LT1933 buck regulator will tolerate a shorted
output. There is another situation to consider in systems
where the output will be held high when the input to the
LT1933 is absent. This may occur in battery charging
applications or in battery backup systems where a battery
or some other supply is diode OR-ed with the LT1933鈥檚
output. If the V
IN
pin is allowed to float and the SHDN pin
is held high (either by a logic signal or because it is tied to
V
IN
), then the LT1933鈥檚 internal circuitry will pull its
quiescent current through its SW pin. This is fine if your
system can tolerate a few mA in this state. If you ground
the SHDN pin, the SW pin current will drop to essentially
zero. However, if the V
IN
pin is grounded while the output
is held high, then parasitic diodes inside the LT1933 can
RUN
5V/DIV
I
IN
100mA/DIV
V
OUT
5V/DIV
50碌s/DIV
RUN
5V/DIV
I
IN
100mA/DIV
V
OUT
5V/DIV
0.5ms/DIV
W
U
U
11

LT1933 PDF文件相關(guān)型號(hào)

LT1933ES6,LT1933IS6

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