LT8611EUDDPBF Datasheet, PDF (5/24 Pages) Linear Dimensions Semiconductor – 42V, 2.5A Synchronous Step-Down Regulator with Current Sense and 2.5μA Quiescent Current

Typical Performance Characteristics
LT8611
No Load Supply Current
5.0
4.5
V_OUT = 3.3V
IN REGULATION
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0 5 10 15 20 25 30 35 40 45
INPUT VOLTAGE (V)
8611 G10
No Load Supply Current
25
V_OUT = 3.3V
V_IN = 12V
20 ^{IN REGULATION}
15
10
5
0
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
8611 G11
Top FET Current Limit vs Duty Cycle
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
0
0.2
0.4
0.6
0.8 1.0
DUTY CYCLE
8611 G12
Top FET Current Limit
5.0
4.5
30% DC
4.0
70% DC
3.5
3.0
2.5
–55 –25 5
35 65
TEMPERATURE (°C)
95 125
8611 G13
Bottom FET Current Limit
3.6
3.4
3.2
3.0
2.8
2.6
2.4
–55 –25 5
35 65
TEMPERATURE (°C)
95 125
8611 G14
Switch Drop
250
SWITCH CURRENT = 1A
200
150
TOP SW
100
BOT SW
50
0
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
8611 G15
Switch Drop
450
400
350
300
250
TOP SW
200
BOT SW
150
100
50
0
0 0.5 1 1.5 2 2.5 3
SWITCH CURRENT (A)
8611 G16
Minimum On-Time
80
I_LOAD = 1A, V_SYNC = 0V
75
I_LOAD = 1A, V_SYNC = 3V
70
I_LOAD = 2.5A, V_SYNC = 0V
I_LOAD = 2.5A, V_SYNC = 3V
65
60
55
50
45
40
35
30
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
8611 G17
Minimum Off-Time
100
V_IN = 3.3V
95 ^ILOAD ^{= 0.5A}
90
85
80
75
70
65
60
–50 –25
5 35 65 95
TEMPERATURE (°C)
125 155
8611 G18
8611f
5