LTC3851_15 Datasheet, PDF (7/28 Pages) Linear Technology – Synchronous Step-Down Switching Regulator Controller

TYPICAL PERFORMANCE CHARACTERISTICS
LTC3851
Shutdown (RUN) Threshold
vs Temperature
1.4
1.3
RUN RISING THRESHOLD (ON)
1.2
RUN FALLING THRESHOLD (OFF)
1.1
1.0
0.9
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3851 G20
Oscillator Frequency
vs Input Voltage
420
R_FREQ = 80k
415
410
405
400
395
390
385
380
5
10 15 20 25 30 35 40
INPUT VOLTAGE (V)
3851 G23
Shutdown Input DC Supply
Current vs Temperature
40
35
30
25
20
15
10
5
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3851 G26
Regulated Feedback Voltage
vs Temperature
806
804
802
800
798
796
794
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3851 G21
Undervoltage Lockout Threshold
(INTV_CC) vs Temperature
5
4
INTV_CC RAMPING UP
3
INTV_CC RAMPING DOWN
2
1
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3851 G24
Input DC Supply Current
vs Temperature
3.0
2.5
2.0
1.5
1.0
0.5
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3851 G27
Oscillator Frequency
vs Temperature
900
800
R_FREQ = 36k
700
600
R_FREQ = 60k
500
400
300
200
–50 –25
R_FREQ = 150k
0 25 50 75
TEMPERATURE (°C)
100 125
3851 G22
Shutdown Input DC Supply
Current vs Input Voltage
40
35
30
25
20
15
10
5
0
0 5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
3851 G25
Maximum Current Sense
Threshold vs INTV_CC Voltage
90
80
I_SET = INTV_CC
70
60
I_SET = FLOAT
50
40
I_SET = GND
30
20
10
0
3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0
INTV_CC VOLTAGE(V)
38511 G28
3851fb
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