LT3992 Datasheet, PDF (5/36 Pages) –

Typical Performance Characteristics
LT3992
Shutdown Threshold and Minimum
Input Voltage vs Temperature
3.5
3.0
MINIMUM
INPUT VOLTAGE
2.5
2.0
SHUTDOWN
1.5
THRESHOLD VOLTAGE
1.0
0.5
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3992 G01
T_J Output Voltage vs Temperature
1.50
1.25
1.00
0.75
0.50
0.25 ^RTJ ^{= 30k}
TO GND
0
–0.25
R_TJ = 30k TO –1V
–0.50
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3992 G04
Comparator Thresholds
vs Temperature
730
720
RISING THRESHOLD
710
700
690
680
670
660
650
FALLING THRESHOLD
640
630
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3992 G07
Shutdown Quiescent Current
vs Temperature
10
9
8
7
I_Q1
6
5
4
3
2
1
0
–50 –25
I_Q2
0 25 50 75 100 125 150
TEMPERATURE (°C)
3992 G02
FB Voltage and CH1-CH2 FB
Offset vs Temperature
820
8
6
815
4
2
OFFSET
810
0
–2
CH2
805
–4
CH1
–6
800
–50 –25
–8
0 25 50 75 100 125 150
TEMPERATURE (°C)
3992 G03
Error Amplifier Transconductance
vs Temperature
415
400
385
370
355
340
325
310
295
280
265
250
–50 –30 –10 10 30 50 70 90 110 130 150
TEMPERATURE (°C)
3992 G05
Soft-Start-to-Feedback Offset
vs Temperature
4
V_SS = 0.4V
3
2
1
0
–1
–2
–3
–4
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3992 G06
Comparator Sink Current
vs Temperature
400
SINK CURRENT AT V_CMPO = 0.4V
350
300
250
200
150
100
50
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3992 G08
Switching Frequency
vs Temperature
1800
1600
R_RT/SYNC = 44.2k
1400
1200
1000
R_RT/SYNC = 28.0k
800
600
R_RT/SYNC = 13.0k
400
200
R_RT/SYNC = 0k
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3992 G09
3992f
5