Datasheet

4
LT1738
1738fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Feedback Voltage and Input
Current vs Temperature
Negative Feedback Voltage and
Input Current vs Temperature
Feedback Overvoltage Shutdown
vs Temperature
Error Amp Transconductance vs
Temperature
Error Amp Output Current vs
Feedback Pin Voltage from Nominal
V
C
Pin Threshold and Clamp
Voltage vs Temperature
CS Pin Trip Voltage and CS Fault
Voltage vs Temperature
SHDN Pin On and Off Thresholds
vs Temperature
TEMPERATURE (°C)
–50 –25 0 25 50 75 100 125 150
FEEDBACK VOLTAGE (V)
1738 G01
1.260
1.258
1.256
1.254
1.252
1.250
1.248
1.246
1.244
1.242
1.240
FB INPUT CURRENT (nA)
750
700
650
600
550
500
450
400
350
300
250
TEMPERATURE (°C)
–50 –25 0 25 50 75 100 125 150
NEGATIVE FEEDBACK VOLTAGE (V)
1738 G02
2.480
2.485
2.490
2.495
2.500
2.505
2.510
2.515
2.520
NFB INPUT CURRENT (µA)
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
TEMPERATURE (°C)
–50 –25 0 25 50 75 100 125 150
FEEDBACK VOLTAGE (V)
1738 G03
1.70
1.65
1.60
1.55
1.50
1.45
1.40
1.35
1.30
1.25
1.20
TEMPERATURE (°C)
–50 –25 0 25 50 75 100 125 150
TRANSCONDUCTANCE (µmho)
1738 G04
2000
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
FEEDBACK PIN VOLTAGE FROM NOMINAL (mV)
–400 –300 –200 –100 0 100 200 300 400
CURRENT (µA)
1738 G05
500
400
300
200
100
0
–100
–200
–300
–400
–500
–40°C
125°C
25°C
TEMPERATURE (°C)
–50 –25 0 25 50 75 100 125 150
V
C
PIN VOLTAGE (V)
1738 G06
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
CLAMP
THRESHOLD
TEMPERATURE (°C)
–50 –25 0 25 50 75 100 125 150
CS PIN VOLTAGE (mV)
1738 G07
240
220
200
180
160
140
120
100
80
FAULT
TRIP
TEMPERATURE (°C)
–50 –25 0 25 50 75 100 125 150
SHDN PIN VOLTAGE (V)
1738 G08
1.50
1.45
1.40
1.35
1.30
1.25
ON
OFF