Datasheet

LT3480
6
3480fe
For more information www.linear.com/LT3480
FB PIN ERROR VOLTAGE (V)
–200
–50
V
C
PIN CURRENT (µA)
–20
0
20
0 200
50
3480 G19
–40
–100 100
40
10
–10
30
–30
LOAD CURRENT (A)
1
INPUT VOLTAGE (V)
3.0
3.5
10000
3480 G20
2.5
2.0
10 100 1000
5.0
4.5
4.0
V
OUT
= 3.3V
T
A
= 25°C
L = 4.7µH
f = 800kHz
1 1000010 100 1000
LOAD CURRENT (A)
INPUT VOLTAGE (V)
5.0
5.5
3480 G21
4.5
4.0
6.5
6.0
V
OUT
= 5V
T
A
= 25 °C
L = 4.7µH
f = 800kHz
TEMPERATURE (°C)
V
C
VOLTAGE (V)
1.50
2.00
2.50
3480 G22
1.00
0.50
0
CURRENT LIMIT CLAMP
SWITCHING THRESHOLD
–50 25–25 0 50 75 100 150125
TEMPERATURE (°C)
THRESHOLD VOLTAGE (%)
85
90
95
3480 G23
80
75
–50 25–25 0 50 75 100 150125
3480 G24
I
L
0.2A/DIV
V
SW
5V/DIV
V
OUT
10mV/DIV
5µs/DIV
V
IN
= 12V; FRONT PAGE APPLICATION
I
LOAD
= 10mA
Error Amp Output Current Minimum Input Voltage Minimum Input Voltage
V
C
Voltages Power Good Threshold Switching Waveforms; Burst Mode
TYPICAL PERFORMANCE CHARACTERISTICS
RUN/SS PIN VOLTAGE (V)
0
SWITCH CURRENT LIMIT (A)
3.5
1.5
3480 G16
2.0
1.0
0.5 1 2
0.5
0
4.0
3.0
2.5
1.5
2.5 3 3.5
RUN/SS PIN VOLTAGE (V)
0
RUN/SS PIN CURRENT (µA)
8
10
12
15 25
3480 G17
6
4
5 10
20 30 35
2
0
BOOST DIODE CURRENT (A)
0
BOOST DIODE V
f
(V)
0.8
1.0
1.2
2.0
3480 G18
0.6
0.4
0
0.5 1.0 1.5
0.2
1.4
Soft-Start RUN/SS Pin Current Boost Diode