LTC3613 Datasheet, PDF (6/36 Pages) Linear Technology – 24V, 15A Monolithic Step Down Regulator

LTC3613
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise noted
Overcurrent Protection
LOAD-STEP
TRIGGER ^7.5A
V_OUT
1V/DIV
V_OUT DROOPS
DUE TO
REACHING CURRENT LIMIT
I_LOAD
10A/DIV
Short-Circuit Protection
SHORT-
CIRCUIT
TRIGGER
SHORT-CIRCUIT
REGION
V_OUT
1V/DIV
I_LOAD
10A/DIV
NOTE
Overvoltage Protection
V_OUT
200mV/DIV
OVERVOLTAGE
TRIGGER
I_L
10A/DIV
SW
20V/DIV
OVERVOLTAGE REGION
V_IN = 12V
4ms/DIV
V_OUT = 1.5V
FIGURE 10 CIRCUIT
3613 G10
V_IN = 12V
200μs/DIV
V_OUT = 1.5V
FIGURE 10 CIRCUIT
3613 G11
NOTE: INDUCTOR CURRENT REACHES
CURRENT LIMIT BEFORE FOLDBACK
AND DURING SHORT-CIRCUIT RECOVERY
V_IN = 12V
20μs/DIV
V_OUT = 1.5V
FIGURE 10 CIRCUIT
NOTE: SW IS FORCED LOW
FOR EXTENDED PERIODS TO
REMOVE OVERVOLTAGE
3613 G12
Output Regulation
vs Input Voltage
0.5
V_IN = 12V
I_LOAD = 5A
FIGURE 10 CIRCUIT
0.3
Output Regulation
vs Load Current
0.5
V_IN = 12V
I_LOAD = 4A
0.3 ^{FIGURE 10 CIRCUIT}
0.1
0.1
–0.1
–0.1
–0.3
–0.3
–0.5
0
4
8 12 16 20 24
INPUT VOLTAGE (V)
3613 G13
Switching Frequency
vs Input Voltage
2.0
1.5
1.0
0.5
0
–0.5
V_IN = 12V
I_LOAD = 5A
FIGURE 10 CIRCUIT
–1.0
0
4
8 12 16
V_IN (V)
20 24
3613 G16
–0.5
0
3
6
9
12
15
LOAD CURRENT (A)
3613 G14
Switching Frequency
vs Load Current
0.5
V_IN = 12V
I_LOAD = 4A
0.3 ^{FIGURE 10 CIRCUIT}
0.1
–0.1
–0.3
–0.5
0
3
6
9
12
15
LOAD CURRENT (A)
3613 G17
6
Output Regulation
vs Temperature
0.2
V_IN = 12V
I_LOAD = 0A
V_OUT NORMALIZED AT T_A = 25°C
0.1 ^{FIGURE 10 CIRCUIT}
0
–0.1
–0.2
–50 –25 0 25 50 55 100 125 150
TEMPERATURE (°C)
3613 G15
Non-Synchronized Switching
Frequency vs Temperature
1.0
V_IN = 12V
I_LOAD = 0A
0.5 FREQUENCY NORMALIZED AT T_A = 25°C
FIGURE 10 CIRCUIT
0
–0.5
–1.0
–1.5
–2.0
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3613 G18
3613fa