LT3480
4
3480fe
For more information www.linear.com/LT3480
TYPICAL PERFORMANCE CHARACTERISTICS
LOAD CURRENT (A)
0
50
100
0.2 0.4 0.6 0.8 1.2 1.4 1.6 1.8 2.01.0
3480 G01
60
90
80
70
V
IN
= 24V
V
IN
= 34V
V
IN
= 12V
L: NEC PLC-0745-5R6
f: 800kHz
V
OUT
= 5V
0 0.2 0.4 0.6 0.8 1.2 1.4 1.6 1.8 2.01.0
LOAD CURRENT (A)
50
EFFICIENCY (%)
90
3480 G02
60
65
55
85
80
70
75
V
IN
= 12V
V
IN
= 7V
L: NEC PLC-0745-5R6
f: 800kHz
V
IN
= 24V
V
IN
= 34V
V
OUT
= 3.3V
LOAD CURRENT (A)
0
EFFICIENCY (%)
POWER LOSS (W)
40
30
0.5 1.0 1.5 2
3480 G27
60
50
90
80
70
0.01
0.1
10
1
V
IN
= 12V
V
OUT
= 3.3V
L = 5.6µH
F = 800 kHz
INPUT VOLTAGE (V)
0
15
3480 G04
40
20
5 10 20
0
100
80
60
25 30 35
V
OUT
= 3.3V
TEMPERATURE (°C)
–50
350
25
3480 G05
200
100
–25 0 50
50
0
400
300
250
150
75 100 150125
V
IN
= 12V
V
OUT
= 3.3V
CATCH DIODE: DIODES, INC. PDS360
INCREASED SUPPLY
CURRENT DUE TO CATCH
DIODE LEAKAGE AT
HIGH TEMPERATURE
INPUT VOLTAGE (V)
5
15
3480 G06
2.5
10 20
1.5
1.0
3.5
3.0
2.0
25 30
TYPICAL
MINIMUM
V
OUT
= 3.3V
T
A
= 25 °C
L = 4.7µH
f = 800 kHz
Efficiency
Efficiency
Efficiency
No Load Supply Current
No Load Supply Current
Maximum Load Current
ELECTRICAL CHARACTERISTICS
guaranteed over the –40°C to 125°C temperature range. The LT3480H
specifications are guaranteed over the –40°C to 150°C temperature range.
The LT3480MP specifications are guaranteed over the –55°C to 150°C
temperature range.
Note 3: Bias current flows out of the FB pin.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
Note 5: For operation at T
J
≤ 125°C, the absolute maximum voltage at V
IN
and RUN/SS pins is 40V for continuous operation and 60V for up to
1 second nonrepetitive transients. For operation at T
J
> 125°C, the
absolute maximum voltage at V
IN
and RUN/SS pins is 36V.
