Datasheet

LT8620
5
8620fa
For more information www.linear.com/LT8620
TYPICAL PERFORMANCE CHARACTERISTICS
Top FET Current Limit vs Duty Cycle
Top FET Current Limit
Bottom FET Current Limit Switch Drop
Minimum On-Time
Switch Drop
No Load Supply Current
INPUT VOLTAGE (V)
0
0
INPUT CURRENT (µA)
0.5
1.5
2.0
2.5
5.0
3.5
20
30
8620 G10
1.0
4.0
4.5
3.0
10
40
50
60
V
OUT
= 3.3V
IN REGULATION
DUTY CYCLE
0
CURRENT LIMIT (A)
3.5
0.6
1.0
8620 G11
3.0
2.5
2.0
0.2 0.4 0.8
4.0
TEMPERATURE (°C)
–50
20
MINIMUM ON-TIME (ns)
22
24
34
28
0
50
75 100
8620 G16
30
32
26
–25
25
125
I
LOAD
= 1A, V
SYNC
= 0V
I
LOAD
= 1A, V
SYNC
= 3V
I
LOAD
= 2A, V
SYNC
= 0V
I
LOAD
= 2A, V
SYNC
= 3V
TEMPERATURE (°C)
–50 –25
0
SWITCH DROP (mV)
200
150
350
0
50
75
8620 G14
50
100
300
250
25
100
125
TOP SWITCH
BOTTOM SWITCH
SWITCH CURRENT = 1A
SWITCH CURRENT (A)
0 0.25
0
SWITCH DROP (mV)
50
150
200
250
1.25
450
8620 G15
100
1
0.5 0.75
1.751.5
2
300
350
400
TOP SWITCH
BOTTOM SWITCH
T
A
= 25°C, unless otherwise noted.
Dropout Voltage
Switching Frequency
LOAD CURRENT (A)
0
DROPOUT VOLTAGE (mV)
400
8620 G17
200
0
1
0.50.25 0.75
1.51.25 1.75
600
300
100
500
2
TEMPERATURE (°C)
–50
SWITCHING FREQUENCY (kHz)
730
50
8620 G18
700
680
–25 250 75
670
660
740
R
T
= 60.4k
720
710
690
100 125 150
DUTY CYCLE = 5%
TEMPERATURE (°C)
–55
–25
5
35
65
95
125
155
3.0
3.5
4.0
4.5
5.0
CURRENT LIMIT (A)
8620 G12
TEMPERATURE (°C)
–55
–25
5
35
65
95
125
155
3.0
3.5
4.0
4.5
5.0
CURRENT LIMIT (A)
8620 G13
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