Datasheet

LT3480
5
3480fe
For more information www.linear.com/LT3480
INPUT VOLTAGE (V)
5
LOAD CURRENT (A)
15
3480 G07
2.5
10 20
1.5
1.0
3.5
3.0
2.0
25 30
TYPICAL
MINIMUM
V
OUT
= 5V
T
A
= 25 °C
L = 4.7µH
f = 800kHz
DUTY CYCLE (%)
0
SWITCH CURRENT LIMIT(A)
40
3480 G08
2.5
20 60
1.5
1.0
4.0
3.5
3.0
2.0
80 100
TEMPERATURE (°C)
SWITCH CURRENT LIMIT (A)
2.0
2.5
3.5
3.0
3480 G09
1.5
1.0
0
0.5
4.5
4.0
DUTY CYCLE = 10 %
DUTY CYCLE = 90 %
–50 25–25 0 50 75 100 150125
Maximum Load Current Switch Current Limit Switch Current Limit
TYPICAL PERFORMANCE CHARACTERISTICS
SWITCH CURRENT (mA)
0
400
500
700
1500
3480 G10
300
200
500 1000 2000 2500
100
0
600
VOLTAGE DROP (mV)
SWITCH CURRENT (mA)
0
BOOST PIN CURRENT (mA)
10
30
40
50
80
3480 G11
20
60
70
0 1500500 1000 2000 2500
TEMPERATURE (°C)
FEEDBACK VOLTAGE (mV)
800
4380 G12
760
840
780
820
–50 25–25 0 50 75 100 150125
TEMPERATURE (°C)
FREQUENCY (MHz)
1.00
1.10
4380 G13
0.90
0.80
1.20
0.95
1.05
0.85
1.15
–50 25–25 0 50 75 100 150125
FB PIN VOLTAGE (mV)
0
SWITCHING FREQUENCY (kHz)
800
1000
1200
600
3480 G14
600
400
200 400
800
500
100 300
700 900
200
0
TEMPERATURE (˚C)
MINIMUM SWITCH ON TIME (ns)
80
100
120
3480 G15
60
40
20
0
140
–50 25–25 0 50 75 100 150125
Switch Voltage Drop Boost Pin Current Feedback Voltage
Switching Frequency Frequency Foldback Minimum Switch On-Time