Datasheet

LT3973/LT3973-3.3/LT3973-5
7
3973fa
Typical perFormance characTerisTics
T
A
= 25°C, unless otherwise noted.
Catch Diode Forward Voltage
Boost Diode Forward VoltageV
FB
Regulation Voltage
Minimum Input Voltage to Switch
Minimum Input Voltage,
V
OUT
= 3.3V
Minimum Input Voltage,
V
OUT
= 5V
Start-Up and Dropout
Performance
BOOST Pin Current
Switch V
CESAT
SWITCH CURRENT (mA)
0
0
SWITCH V
CESAT
(mV)
100
200
300
400
500
600
200 400 600 800 1000
3973 G19
1200
SWITCH CURRENT (mA)
0
15
20
25
800 1000
3973 G20
10
200 400 600 1200
5
0
BOOST PIN CURRENT (mA)
LOAD CURRENT (mA)
0 100
2.5
INPUT VOLTAGE (V)
3.5
5.0
200
400
500
3973 G21
3.0
4.5
4.0
300
600
700
TO START/TO RUN
FRONT PAGE APPLICATION
V
OUT
= 3.3V
LOAD CURRENT (mA)
0 100
4.0
INPUT VOLTAGE (V)
5.0
6.5
200
400
500
3973 G22
4.5
6.0
5.5
300
600
700
TO START/TO RUN
FRONT PAGE APPLICATION
V
OUT
= 5V
TIME
VOLTAGE (V)
6
7
9
8
5
3973 G23
4
3
2
1
0
FRONT PAGE APPLICATION
V
IN
V
OUT
TEMPERATURE (°C)
3.5
INPUT VOLTAGE (V)
4.0
–50 100 12525 7550 150
3973 G24
2.0
3.0
2.5
–25 0
INPUT VOLTAGE (V)
1.2
V
FB
(V)
1.4
2.0 4.0 4.53.53.0 5.0
3973 G25
0.6
1.0
0.8
2.5
BOOST DIODE CURRENT (mA)
0
0
BOOST DIODE V
F
(V)
0.2
0.4
0.6
0.8
1.0
1.2
50 100 150 200
3973 G26
150°C
125°C
25°C
–50°C
CATCH DIODE CURRENT (mA)
0
CATCH DIODE, V
F
(V)
0.4
0.6
1200
3973 G27
0.2
0
200 400
600
800 1000
1.0
0.8
150°C
125°C
25°C
–50°C