Datasheet

LT8611
5
8611fa
For more information www.linear.com/LT8611
TYPICAL PERFORMANCE CHARACTERISTICS
Top FET Current Limit vs Duty Cycle
Top FET Current Limit
Bottom FET Current Limit
Switch Drop
Minimum On-TimeSwitch Drop
No Load Supply Current No Load Supply Current
Minimum Off-Time
INPUT VOLTAGE (V)
0
0
INPUT CURRENT (µA)
0.5
1.5
2.0
2.5
5.0
3.5
10
20
25 45
8611 G10
1.0
4.0
4.5
3.0
5 15
30
35
40
V
OUT
= 3.3V
IN REGULATION
TEMPERATURE (°C)
–55 –25
0
INPUT CURRENT (µA)
10
25
5
65
95
8611 G11
5
20
15
35
125
155
V
OUT
= 3.3V
V
IN
= 12V
IN REGULATION
TEMPERATURE (°C)
–55
30
MINIMUM ON-TIME (ns)
35
45
50
55
80
65
5
65
95 125
8611 G17
40
70
75
60
–25
35
155
I
LOAD
= 1A, V
SYNC
= 0V
I
LOAD
= 1A, V
SYNC
= 3V
I
LOAD
= 2.5A, V
SYNC
= 0V
I
LOAD
= 2.5A, V
SYNC
= 3V
TEMPERATURE (°C)
–50
MINIMUM OFF-TIME (ns)
95
35
8611 G18
80
70
–25 5 65
65
60
100
90
85
75
95 125 155
V
IN
= 3.3V
I
LOAD
= 0.5A
DUTY CYCLE
0
CURRENT LIMIT (A)
3.5
4.0
4.5
0.6
1.0
8611 G12
3.0
2.5
2.0
0.2 0.4 0.8
5.0
5.5
6.0
TEMPERATURE (°C)
–55
2.5
CURRENT LIMIT (A)
3.0
3.5
4.0
4.5
5.0
–25
5 35 65
8611 G13
95
125
30% DC
70% DC
TEMPERATURE (°C)
–55
2.4
CURRENT LIMIT (A)
2.6
2.8
3.0
3.2
3.6
–25
5 35 65
8611 G14
95
125
3.4
TEMPERATURE (°C)
–55 –25
0
SWITCH DROP (mV)
100
250
5
65
95
8611 G15
50
200
150
35
125
155
TOP SW
BOT SW
SWITCH CURRENT = 1A
SWITCH CURRENT (A)
0
0
SWITCH DROP (mV)
50
150
200
250
2
450
8611 G16
100
1
0.5
2.5
1.5 3
300
350
400
TOP SW
BOT SW
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