LTC3814-5_15 Datasheet, PDF (5/30 Pages) Linear Technology – 60V Current Mode Synchronous Step-Up Controller

TYPICAL PERFORMANCE CHARACTERISTICS
LTC3814-5
Efficiency vs Load Current
100
V_OUT = 50V
V_IN = 36V
95
V_IN = 24V
V_IN = 12V
90
85
80
0
1
2
3
4
5
LOAD (A)
38145 G04
I_TH Voltage vs Load Current
3
FRONT PAGE CIRCUIT
V_IN = 12V
V_RNG = 1V
2
1
0
0
1
2
3
4
5
LOAD CURRENT (A)
38145 G07
Off-Time vs Temperature
680
I_OFF = 300μA
660
640
620
600
580
560
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
38145 G10
Frequency vs Input Voltage
300
FRONT PAGE CIRCUIT
280
I_LOAD = 0A
260
I_LOAD = 1A
240
220
Frequency vs Load Current
300
FRONT PAGE CIRCUIT
280
V_IN = 12V
260
240
V_IN = 5V
220
200
5
7
9
11
13
15
INPUT VOLTAGE (V)
38145 G05
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
38145 G08
200
0
1
2
3
LOAD CURRENT (A)
4
38145 G06
Off-Time vs I_OFF Current
10000
V_OFF = INTV_CC
1000
100
10
10
100
1000
I_OFF CURRENT (μA)
10000
38145 G09
Maximum Current Sense
Threshold vs V_RNG Voltage
400
300
200
100
Maximum Current Sense
Threshold vs Temperature
240
V_RNG = INTV_CC
230
220
210
200
0
190
0.5
1
1.5
2
–50 –25 0 25 50 75 100 125
V_RNG VOLTAGE (V)
38145 G11
TEMPERATURE (°C)
38145 G12
38145fc
5