LT3480_15 Datasheet, PDF (4/24 Pages) Linear Technology – 36V, 2A, 2.4MHz Step-Down Switching Regulator with 70A Quiescent Current

LT3480
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.
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency
100
V_IN = 12V
90
80
V_IN = 34V
V_IN = 24V
70
60
50 ^{VOUT = 5V}
L: NEC PLC-0745-5R6
f: 800kHz
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
3480 G01
No Load Supply Current
120
V_OUT = 3.3V
100
80
60
40
20
0
0 5 10 15 20 25 30 35
INPUT VOLTAGE (V)
3480 G04
Efficiency
90
85
V_IN = 12V
80
75
V_IN = 24V
70
V_IN = 7V
V_IN = 34V
65
60
55
50 ^{VOUT = 3.3V}
L: NEC PLC-0745-5R6
f: 800kHz
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
3480 G02
Efficiency
90
10
80
70
1
60
50
0.1
V_IN = 12V
40
V_OUT = 3.3V
L = 5.6µH
F = 800 kHz
30
0.01
0 0.5
1.0
1.5
2
LOAD CURRENT (A)
3480 G27
No Load Supply Current
400
CATCH DIODE: DIODES, INC. PDS360
350 _{VIN = 12V}
300 ^{VOUT = 3.3V}
INCREASED SUPPLY
250
CURRENT DUE TO CATCH
DIODE LEAKAGE AT
200
HIGH TEMPERATURE
150
100
50
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3480 G05
Maximum Load Current
4.0
3.5
TYPICAL
3.0
2.5
2.0
1.5
1.0
5
MINIMUM
V_OUT = 3.3V
T_A = 25 °C
L = 4.7µH
f = 800 kHz
10
15
20
25
30
INPUT VOLTAGE (V)
3480 G06
3480fe
4
For more information www.linear.com/LT3480