Datasheet

LT3976
5
3976f
For more information www.linear.com/3976
Typical perForMance characTerisTics
T
A
= 25°C, unless otherwise noted.
Reference Voltage Load Regulation Line Regulation
LOAD CURRENT (A)
0
CHANGE IN OUTPUT (%)
0.1
0.3
0.5
4
3976 G08
–0.1
–0.3
0
0.2
0.4
–0.2
–0.4
–0.5
1
2
3
5
V
IN
= 12V
V
OUT
= 3.3V
TEMPERATURE (°C)
–55
REFERENCE VOLTAGE (V)
1.190
1.220
1.225
1.230
5
65
95
3976 G07
1.180
1.175
1.210
1.200
1.185
1.215
1.170
1.205
1.195
–25
35
125
155
INPUT VOLTAGE (V)
5
–0.05
CHANGE IN OUTPUT (%)
–0.04
–0.02
–0.01
0
0.05
0.02
15
25
30 35
3976 G09
–0.03
0.03
0.04
0.01
10
20
40
V
OUT
= 5V
LOAD = 1A
Current Limit Foldback
Switch Current Limit
Switch Current Limit
Thermal Derating Thermal Derating
TEMPERATURE (°C)
0
0
LOAD CURRENT (A)
1
6
3
50 100 125
3976 G10
4
5
2
25 75 150
V
OUT
= 3.3V
f
SW
= 400kHz
2.5in × 2.5in 4-LAYER BOARD
12V
24V
36V
H-GRADE
I-GRADE
LIMITED BY MAXIMUM
JUNCTION TEMPERATURE
Θ
JA
= 40°C/W
TEMPERATURE (°C)
0
0
LOAD CURRENT (A)
1
6
3
50 100 125
3976 G11
4
5
2
25 75 150
H-GRADE
12V
24V
36V
I-GRADE
V
OUT
= 5V
f
SW
= 400kHz
2.5in × 2.5in 4-LAYER BOARD
LIMITED BY MAXIMUM
JUNCTION TEMPERATURE
Θ
JA
= 40°C/W
DUTY CYCLE
0
7.0
CURRENT LIMIT (A)
7.5
8.0
8.5
9.0
9.5
10.0
0.2 0.4 0.6 0.8
3976 G12
1.0
TEMPERATURE (°C)
–55
CURRENT LIMIT (A)
10
11
12
35 95
3976 G13
9
8
–25 5
65 125 155
7
6
30% DUTY CYCLE
FB PIN VOLTAGE (V)
0
0
CURRENT LIMIT (A)
2
4
6
0.2
0.4
0.60.8
3976 G14
1.0
8
10
1
3
5
7
9
1.2
30% DUTY CYCLE
V
SS
= 3V
SS PIN VOLTAGE (V)
0
CURRENT LIMIT (A)
6
8
10
2.0
3976 G15
4
2
5
7
9
3
1
0
0.5
1.0
1.5
2.5
V
FB
= 1V
V
FB
= 0V
30% DUTY CYCLE
FB PIN VOLTAGE (V)
0
0
CURRENT LIMIT (A)
2
4
6
0.2
0.4
0.6 0.8
3976 G14
1.0
8
10
1
3
5
7
9
1.2
30% DUTY CYCLE
V
SS
= 3V
Soft-Start