LT3844 데이터 시트보기 (PDF) - Linear Technology
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LT3844 Datasheet PDF : 24 Pages
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LT3844
TYPICAL PERFOR A CE CHARACTERISTICS
I(SENSE+ + SENSE–) vs
VSENSE (CM)
400
300
TA = 25°C
200
100
0
–100
–200
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VSENSE (CM) (V)
3844 G10
Maximum Current Sense
Threshold vs Temperature
106
104
102
100
98
96
94
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3844 G16
Operating Frequency
vs Temperature
308
306
304
302
300
298
296
294
292
290
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3844 G17
VIN UVLO Threshold (Rising)
vs Temperature
4.54
4.52
4.50
4.48
4.46
4.44
4.42
4.40
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3844 G14
Error Amp Reference
vs Temperature
1.234
1.233
1.232
1.231
1.230
1.229
1.228
1.227
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3844 G12
VIN UVLO Threshold (Falling)
vs Temperature
3.86
3.84
3.82
3.80
3.78
3.76
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3844 G15
PI FU CTIO S
VIN (Pin 1): The VIN pin is the main supply pin and should
be decoupled to SGND with a low ESR capacitor located
close to the pin.
SHDN (Pin 2): The SHDN pin has a precision IC enable
threshold of 1.35V (rising) with 120mV of hysteresis. It is
used to implement an undervoltage lockout (UVLO) cir-
cuit. See Application Information section for implement-
ing a UVLO function. When the SHDN pin is pulled below
a transistor VBE (0.7V), a low current shutdown mode is
entered, all internal circuitry is disabled and the VIN supply
current is reduced to approximately 9μA. Typical pin input
bias current is <10μA and the pin is internally clamped to
6V.
CSS (Pin 3): The soft-start pin is used to program the
supply soft-start function. Use the following formula to
calculate CSS for a given output voltage slew rate:
CSS = 2μA(tSS/1.231V)
The pin should be left unconnected when not using the
soft-start function.
3844fa
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