Datasheet

LT3995
5
3995f
For more information www.linear.com/LT3995
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Current Limit
Switch Current Limit Current Limit Foldback Soft-Start
Switch V
CESAT
BOOST Pin Current
Thermal Derating Thermal Derating
T
A
= 25°C, unless otherwise noted.
Minimum On-Time
DUTY CYCLE
0
4.0
CURRENT LIMIT (A)
4.5
5.0
5.5
6.0
6.5
7.0
0.2 0.4 0.6 0.8
3995 G11
1.0
TEMPERATURE (°C)
–55
CURRENT LIMIT (A)
6.0
6.5
7.0
35 95
3995 G12
5.5
5.0
–25 5
65 125 155
4.5
4.0
30% DUTY CYCLE
FB PIN VOLTAGE (V)
0
7
6
5
4
3
2
1
0
0.6 1.0
3995 G13
0.2 0.4
0.8 1.2
CURRENT LIMIT (A)
30% DUTY CYCLE
V
SS
= 3V
SS PIN VOLTAGE (V)
0
5
6
7
2
3995 G14
4
3
0.5 1 1.5 2.5
2
1
0
CURRENT LIMIT (A)
V
FB
= 1V
30% DUTY CYCLE
V
FB
= 0.2V
SWITCH CURRENT (A)
0
0
SWITCH DROP (mV)
50
100
150
200
300
0.5
1 1.5 2
3995 G15
2.5 3
250
SWITCH CURRENT (A)
0
70
60
50
40
30
20
10
0
1.5 2.5
3995 G16
0.5 1
2 3
BOOST PIN CURRENT (mA)
TEMPERATURE (°C)
–55
MINIMUM ON-TIME (ns)
175
200
225
35 95
3995 G17
150
125
–25 5
65 125 155
100
75
LOAD = 2A
LOAD = 1A
V
SYNC
= 0V
f
SW
= 2MHz
TEMPERATURE (°C)
0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
75 125
3995 G10
25 50
100 150
LOAD CURRENT (A)
V
OUT
= 3.3V
f
SW
= 300kHz
2.5in × 2.5in 4-LAYER BOARD
LIMITED BY MAXIMUM JUNCTION
TEMPERATURE θ
JA
= 40°C/W
12V
IN
24V
IN
36V
IN
48V
IN
60V
IN
H-GRADE
TEMPERATURE (°C)
0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
75 125
3995 G38
25 50
100 150
LOAD CURRENT (A)
V
OUT
= 5V
f
SW
= 500kHz
2.5in × 2.5in 4-LAYER BOARD
LIMITED BY MAXIMUM JUNCTION
TEMPERATURE θ
JA
= 40°C/W
12V
IN
24V
IN
36V
IN
48V
IN
60V
IN
H-GRADE