Datasheet
LT3970 Series
6
3970fc
Typical perFormance characTerisTics
Boost Diode Forward Voltage Catch Diode Forward Voltage
Catch Diode Leakage
T
A
= 25°C, unless otherwise noted.
BOOST Pin Current
Minimum Input Voltage,
V
OUT
= 3.3V
Minimum Input Voltage,
V
OUT
= 5V
Switch V
CESAT
(I
SW
= 200mA)
vs Temperature Switch V
CESAT
Minimum
Switch On-Time/Switch Off-Time
TEMPERATURE (°C)
–50
0
SWITCH ON-TIME/SWITCH OFF-TIME (ns)
20
60
80
100
200
140
0
50
75
3970 G16
40
160
180
120
–25 25
100
125
150
MINIMUM OFF-TIME
LOAD CURRENT = 175mA
MINIMUM ON-TIME
TEMPERATURE (°C)
–50
100
SWITCH V
CESAT
(mV)
150
200
250
–25 0 25 50
3970 G17
75 100 125
150
SWITCH CURRENT (mA)
0
SWITCH V
CESAT
(mV)
300
400
400
3970 G18
200
100
0
100
200
300
500
SWITCH CURRENT (mA)
0
10
12
14
16
400
3970 G19
8
6
100 200 300
500
4
2
BOOST PIN CURRENT (mA)
LOAD CURRENT (mA)
0 50
2.5
INPUT VOLTAGE (V)
3.5
5.0
100
200
250
3970 G20
3.0
4.5
4.0
150
300
350
FRONT PAGE APPLICATION
V
OUT
= 3.3V
TO START/RUN
LOAD CURRENT (mA)
0 50
4.0
INPUT VOLTAGE (V)
5.0
6.5
100
200
250
3970 G21
4.5
6.0
5.5
150
300
350
FRONT PAGE APPLICATION
V
OUT
= 5V
TO START
TO RUN
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
3970 G22
–50°C
25°C
125°C
150°C
CATCH DIODE CURRENT (mA)
0
CATCH DIODE V
F
(V)
0.6
0.8
1.0
400
3970 G23
0.4
0.2
0
100
200
300
–50°C
25°C
125°C
150°C
TEMPERATURE (°C)
–50
CATCH DIODE LEAKAGE (µA)
12
16
20
25 75
150
3970 G24
8
4
0
–25 0
50
100 125
V
R
= 12V