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LTC3851-1_15 Datasheet, PDF (7/28 Pages) Linear Technology – Synchronous Step-Down Switching Regulator Controller
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TYPICAL PERFORMANCE CHARACTERISTICS
LTC3851-1
Oscillator Frequency
vs Temperature
900
800
RFREQ = 36k
700
600
RFREQ = 60k
500
400
300
200
–50 –25
RFREQ = 150k
0 25 50 75
TEMPERATURE (°C)
100 125
38511 G22
Oscillator Frequency
vs Input Voltage
420
RFREQ = 80k
415
410
405
400
395
390
385
380
5
10 15 20 25 30 35 40
INPUT VOLTAGE (V)
38511 G23
Undervoltage Lockout Threshold
(INTVCC) vs Temperature
5
4
INTVCC RAMPING UP
3
INTVCC RAMPING DOWN
2
1
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
38511 G24
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)
38511 G25
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
38511 G26
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
38511 G27
Maximum Current Sense
Threshold vs INTVCC Voltage
90
80
70
60
50
40
30
20
10
0
3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0
INTVCC VOLTAGE(V)
38511 G28
38511fa
7
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