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LTC1702A Datasheet(PDF) 5 Page - Linear Technology

Part # LTC1702A
Description  High Voltage, Current Mode Switching Regulator Controller with Programmable Operating Frequency
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1702A Datasheet(HTML) 5 Page - Linear Technology

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LT3844
5
3844fb
VSENSE (CM) (V)
0
400
300
200
100
0
–100
–200
0.5 1.0 1.5 2.0
3844 G10
2.5
4.5
3.5
5.0
4.0
3.0
TEMPERATURE (°C)
–50
25
75
3844 G12
–25
0
50
100
125
TEMPERATURE (°C)
–50
25
75
–25
0
50
100
125
TEMPERATURE (°C)
–50
25
75
–25
0
50
100
125
1.234
1.233
1.232
1.231
1.230
1.229
1.228
1.227
3844 G14
3844 G15
4.54
4.52
4.50
4.48
4.46
4.44
4.42
4.40
3.86
3.84
3.82
3.80
3.78
3.76
TA = 25°C
TEMPERATURE (°C)
–50
102
104
106
25
75
3844 G16
100
98
–25
0
50
100
125
96
94
TEMPERATURE (°C)
–50
290
292
296
298
300
50
308
3844 G17
294
0
–25
75
100
25
125
302
304
306
TYPICAL PERFORMANCE CHARACTERISTICS
I(SENSE+ + SENSE–) vs
VSENSE(CM)
Operating Frequency
vs Temperature
Error Amp Reference
vs Temperature
Maximum Current Sense
Threshold vs Temperature
VIN UVLO Threshold (Rising)
vs Temperature
VIN UVLO Threshold (Falling)
vs Temperature
PIN FUNCTIONS
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) circuit.
See Applications Information section for implementing
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.



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