LTC3812-5_15 Datasheet, PDF (6/34 Pages) Linear Technology – 60V Current Mode Synchronous Switching Regulator Controller

LTC3812-5
TYPICAL PERFORMANCE CHARACTERISTICS
I_TH Voltage vs Load Current
3.0
V_RNG = 1V
FRONT PAGE CIRCUIT
2.5
2.0
1.5
1.0
0.5
0
01234567
LOAD CURRENT (A)
38125 G10
On-Time vs Temperature
680
I_ON = 300μA
660
640
620
600
580
560
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
38125 G13
Maximum Current Sense
Threshold vs Temperature
230
V_RNG = INTV_CC
220
210
200
190
180
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
38125 G16
6
Current Sense Threshold
vs I_TH Voltage
400
V_RNG = 2V
300
200
1.4V
1V
100
0.7V
0.5V
0
–100
–200
–300
–400
0 0.5 1 1.5 2
I_TH VOLTAGE (V)
2.5 3
38125 G11
Current Limit Foldback
250
V_RNG = INTV_CC
200
150
100
50
On-Time vs I_ON Current
10000
V_ON = INTV_CC
1000
100
10
10
100
1000
I_ON CURRENT (μA)
10000
38125 G12
Maximum Current Sense
Threshold vs V_RNG Voltage
400
300
200
100
0
0
0.2
0.4
V_FB (V)
Reference Voltage
vs Temperature
0.803
0.6
0.8
38125 G14
0.802
0.801
0.800
0.799
0.798
0.797
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
38125 G17
0
0.5
1
1.5
2
V_RNG VOLTAGE (V)
38125 G15
Driver Peak Source Current
vs Temperature
1.5
V_BOOST = V_INTVCC = 5V
1.0
0.5
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
38125 G18
38125fc