LT8612_15 Datasheet, PDF (6/20 Pages) Linear Technology – 42V, 6A Synchronous Step-Down Regulator with 3A Quiescent Current

LT8612
Typical Performance Characteristics
Frequency Foldback
800
V_OUT = 3.3V
700 ^{VIN = 12V}
V_SYNC = 0V
600 ^{RT = 60.4k}
500
400
300
200
100
0
0
0.2 0.4 0.6
FB VOLTAGE (V)
0.8
1
8612 G19
PG High Thresholds
12.0
11.5
11.0
10.5
FB RISING
10.0
FB FALLING
9.5
9.0
8.5
8.0
7.5
7.0
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
8612 G22
V_IN UVLO
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
8612 G25
Soft-Start Tracking
1.2
1.0
0.8
0.6
0.4
0.2
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
TR/SS VOLTAGE (V)
8612 G20
PG Low Thresholds
–7.0
–7.5
–8.0
–8.5
–9.0
FB RISING
–9.5
–10.0
FB FALLING
–10.5
–11.0
–11.5
–12.0
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
8612 G23
Switching Waveforms
Soft-Start Current
2.4
V_SS = 0.5V
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
–50 –25
5 35 65 95
TEMPERATURE (°C)
125 155
8612 G21
RT Programmed Switching
Frequency
250
225
200
175
150
125
100
75
50
25
0
0.2 0.6
1
1.4 1.8 2.2
SWITCHING FREQUENCY (kHz)
8612 G24
Switching Waveforms
I_L
1A/DIV
V_SW
5V/DIV
5µs/DIV
8612 G26
12V_IN TO 5V_OUT AT 20mA; FRONT PAGE APP
V_SYNC = 0V
I_L
1A/DIV
V_SW
5V/DIV
1µs/DIV
12V_IN TO 5V_OUT AT 2A
FRONT PAGE APP
8612 G27
8612f
6
For more information www.linear.com/LT8612