Datasheet

LT3990
6
3990f
Typical perFormance characTerisTics
Power Good Threshold EN/UVLO Threshold
Transient Load Response; Load
Current is Stepped from 100mA
to 200mA
Switching Waveforms,
Burst Mode Operation
Boost Diode Forward Voltage Catch Diode Forward Voltage Catch Diode Leakage
T
A
= 25°C, unless otherwise noted.
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
3990 G19
–50°C
25°C
125°C
150°C
TEMPERATURE (°C)
–50
CATCH DIODE LEAKAGE (µA)
8
12
15
25 75 150
3990 G21
6
3
0
–25 0
50
100 125
V
R
= 12V
TEMPERATURE (°C)
–50
88
THRESHOLD (%)
89
90
91
92
–25 0 25 50
3990 G22
75 100 125 150
Transient Load Response; Load
Current is Stepped from 10mA
(Burst Mode Operation) to 110mA
V
OUT
100mV/DIV
I
L
100mA/DIV
100µs/DIV
FRONT PAGE APPLICATION
V
IN
= 12V
V
OUT
= 5V
3990 G24
V
OUT
100mV/DIV
I
L
100mA/DIV
100µs/DIV
FRONT PAGE APPLICATION
V
IN
= 12V
V
OUT
= 5V
3990 G25
Switching Waveforms, Full
Frequency Continuous Operation
V
OUT
5mV/DIV
V
SW
5V/DIV
I
L
100mA/DIV
2µs/DIV
FRONT PAGE APPLICATION
V
IN
= 12V
V
OUT
= 5V
I
LOAD
= 10mA
f = 600kHz
3990 G26
V
OUT
5mV/DIV
V
SW
5V/DIV
I
L
200mA/DIV
1µs/DIV
FRONT PAGE APPLICATION
V
IN
= 12V
V
OUT
= 5V
I
LOAD
= 350mA
f = 600kHz
3990 G27
CATCH DIODE CURRENT (mA)
0
CATCH DIODE, V
F
(V)
0.4
0.6
400
3990 G20
0.2
0
100
200
300
1.0
0.8
–50°C
25°C
125°C
150°C
TEMPERATURE (°C)
–50
1.160
THRESHOLD VOLTAGE (V)
1.185
1.210
1.235
1.260
–25 0 25 50
3990 G23
75 100 125 150