LTC3851A-1_15 Datasheet, PDF (8/30 Pages) Linear Technology – Synchronous Step-Down Switching Regulator Controller

LTC3851A-1
Typical Performance Characteristics
Oscillator Frequency
vs Temperature
900
800
R_PLLLPF = 36k
700
600
R_PLLLPF = 60k
500
400
300
R_PLLLPF = 160k
200
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3851A1 G22
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)
3851A1 G23
Undervoltage Lockout Threshold
(INTV_CC) vs Temperature
5
4
INTV_CC RAMPING UP
3
INTV_CC RAMPING DOWN
2
1
0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3851A1 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)
3851A1 G25
Shutdown Input DC Supply
Current vs Temperature
40
35
30
25
20
15
10
5
0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3851A1 G26
Input DC Supply Current
vs Temperature
3.0
2.5
2.0
1.5
1.0
0.5
0
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3851A1 G27
Maximum Current Sense
Threshold vs INTV_CC 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
INTV_CC VOLTAGE(V)
3851A1 G28
3851a1fa
8