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LT1933 Datasheet

  • LT1933

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

  • 629.41KB

  • LINER

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LT1933
APPLICATIO S I FOR ATIO
pull large currents from the output through the SW pin and
the V
IN
pin. Figure 5 shows a circuit that will run only when
the input voltage is present and that protects against a
shorted or reversed input.
D4
V
IN
5
V
IN
BOOST
LT1933
4
SHDN
GND
2
SW
FB
3
BACKUP
6
V
OUT
1
D4: MBR0540
1933 F05
Figure 5. Diode D4 Prevents a Shorted Input from Discharging
a Backup Battery Tied to the Output; It Also Protects the Circuit
from a Reversed Input. The LT1933 Runs Only When the Input
is Present
CLOSING SWITCH
SIMULATES HOT PLUG
I
IN
V
IN
LT1933
+
2.2碌F
LOW
IMPEDANCE
ENERGIZED
24V SUPPLY
STRAY
INDUCTANCE
DUE TO 6 FEET
(2 METERS) OF
TWISTED PAIR
+
10碌F
35V
AI.EI.
+
2.2碌F
1鈩?/div>
LT1933
+
0.1碌F
2.2碌F
Figure 6. A Well Chosen Input Network Prevents Input Voltage Overshoot and
Ensures Reliable Operation When the LT1933 is Connected to a Live Supply
1933f
12
U
Hot Plugging Safely
The small size, robustness and low impedance of ceramic
capacitors make them an attractive option for the input
bypass capacitor of LT1933 circuits. However, these ca-
pacitors can cause problems if the LT1933 is plugged into
a live supply (see Linear Technology Application Note 88
for a complete discussion). The low loss ceramic capaci-
tor combined with stray inductance in series with the
power source forms an under damped tank circuit, and the
voltage at the V
IN
pin of the LT1933 can ring to twice the
nominal input voltage, possibly exceeding the LT1933鈥檚
rating and damaging the part. If the input supply is poorly
controlled or the user will be plugging the LT1933 into an
energized supply, the input network should be designed to
prevent this overshoot.
Figure 6 shows the waveforms that result when an LT1933
circuit is connected to a 24V supply through six feet of 24-
gauge twisted pair. The first plot is the response with a
DANGER!
V
IN
20V/DIV
RINGING V
IN
MAY EXCEED
ABSOLUTE MAXIMUM
RATING OF THE LT1933
I
IN
5A/DIV
20碌s/DIV
W
U
U
(6a)
LT1933
V
IN
20V/DIV
I
IN
5A/DIV
(6b)
V
IN
20V/DIV
20碌s/DIV
I
IN
5A/DIV
(6c)
20碌s/DIV
1933 F06

LT1933 PDF文件相關(guān)型號(hào)

LT1933ES6,LT1933IS6

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