LT3976
4
3976f
For more information www.linear.com/3976
elecTrical characTerisTics
Note 3: Minimum input voltage depends on application circuit.
Note 4: The LT3976 contains circuitry that extends the maximum duty
cycle if there is sufficient voltage across the boost capacitor. See the
Application Information section for more details.
Note 5: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
Note 6: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
when overtemperature protection is active. Continuous operation above
the specified maximum operating junction temperature may impair device
reliability or permanently damage the device.
Typical perForMance characTerisTics
Efficiency at 3.3V
OUT
No-Load Supply Current No-Load Supply Current
Efficiency at 5V
OUT
Efficiency at 3.3V
OUT
Efficiency at 5V
OUT
T
A
= 25°C, unless otherwise noted.
LOAD CURRENT (A)
0
EFFICIENCY (%)
80
90
100
4
3976 G01
70
60
75
85
95
65
55
50
10.5
21.5
3 3.5 4.5
2.5
5
12V
24V
36V
f
SW
= 800kHz
V
OUT
= 5V
LOAD CURRENT (A)
0
EFFICIENCY (%)
80
90
100
4
3976 G02
70
60
75
85
95
65
55
50
10.5
21.5
3 3.5 4.5
2.5
5
12V
24V
36V
FRONT PAGE APPLICATION
V
OUT
= 3.3V
LOAD CURRENT (mA)
0.01
0
EFFICIENCY (%)
20
40
60
0.1
1
10 100
3976 G03
1000
80
100
10
30
50
70
90
10000
12V
24V
36V
f
SW
= 800kHz
V
OUT
= 5V
LOAD CURRENT (mA)
0.01
0
EFFICIENCY (%)
20
40
60
0.1
1
10 100
3976 G04
1000
80
100
10
30
50
70
90
10000
12V
24V
36V
FRONT PAGE APPLICATION
V
OUT
= 3.3V
INPUT VOLTAGE (V)
0
INPUT CURRENT (µA)
4
6
40
3976 G05
2
0
10
20
30
5
15
25
35
8
3
5
1
7
IN REGULATION
V
OUT
= 3.3V
TEMPERATURE (°C)
10
INPUT CURRENT (µA)
1000
10000
–55 65 125
3876 G06
1
5–25 95
155
35
100
FRONT PAGE APPLICATION
V
IN
= 12V
V
OUT
= 3.3V
DUE TO
CATCH DIODE
LEAKAGE
