Datasheet

LT8641
5
Rev B
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TYPICAL PERFORMANCE CHARACTERISTICS
Top FET Current Limit
EN Pin Thresholds
Minimum On-Time
V
OUT
= 5V
V
IN
= 12V
LOAD CURRENT (A)
0
0.5
1
1.5
2
2.5
3
3.5
–0.15
–0.10
–0.05
0
0.05
0.10
0.15
CHANGE IN V
OUT
(%)
Load Regulation
8641 G11
V
OUT
= 5V
I
LOAD
= 1A
INPUT VOLTAGE (V)
5
15
25
35
45
55
65
–0.15
–0.10
–0.05
0
0.05
0.10
0.15
CHANGE IN V
OUT
(%)
Line Regulation
8641 G12
V
OUT
= 3.3V
L = 4.7µH
IN-REGULATION
INPUT VOLTAGE (V)
0
10
20
30
40
50
60
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
INPUT CURRENT (µA)
No-Load Supply Current
8641 G13
DUTY CYCLE
0.1
0.3
0.5
0.7
0.9
5.5
6.0
6.5
7.0
7.5
8.0
8.5
CURRENT LIMIT (A)
Top FET Current Limit vs Duty Cycle
8641 G14
TOP SWITCH
BOTTOM SWITCH
SWITCH CURRENT = 1A
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
150
0
50
100
150
200
250
SWITCH DROP (mV)
Switch Drop
8641 G16
TOP SWITCH
BOTTOM SWITCH
SWITCH CURRENT (A)
0
0.5
1
1.5
2
2.5
3
3.5
0
50
100
150
200
250
300
350
400
450
500
SWITCH DROP (mV)
Switch Drop
8641 G17
EN RISING
EN FALLING
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
150
0.95
0.96
0.97
0.98
0.99
1.00
1.01
1.02
1.03
EN THRESHOLD (V)
EN Pin Thresholds
8641 G10
5% DC
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
150
6
7
8
9
10
CURRENT LIMIT (A)
Top FET Current Limit
8641 G15
I
LOAD
= 2A
V
SYNC
= 0
V
SYNC
= FLOAT
TEMPERATURE (°C)
–50
–25
0
25
50
75
100
125
25
28
31
34
37
40
43
MINIMUM ON-TIME (ns)
8641 G18
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