Datasheet

LT3990/LT3990-3.3/LT3990-5
6
3990fa
TYPICAL PERFORMANCE CHARACTERISTICS
Power Good Threshold
EN/UVLO Threshold
Transient Load Response; Load
Current is Stepped from 100mA
to 200mA
Boost Diode Forward Voltage
Catch Diode Forward Voltage Catch Diode Leakage
T
A
= 25°C, unless otherwise noted.
Transient Load Response; Load
Current is Stepped from 10mA
(Burst Mode Operation) to 110mA
Minimum Input Voltage,
V
OUT
= 3.3V
Minimum Input Voltage,
V
OUT
= 5V
LOAD CURRENT (mA)
0 50
2.5
INPUT VOLTAGE (V)
3.5
5.0
100
200
250
3990 G19
3.0
4.5
4.0
150
300
350
TO START
TO RUN
FRONT PAGE APPLICATION
V
OUT
= 3.3V
LOAD CURRENT (mA)
0 50
4.0
INPUT VOLTAGE (V)
5.0
6.5
100
200
250
3990 G20
4.5
6.0
5.5
150
300
350
TO START
TO RUN
FRONT PAGE APPLICATION
f = 600kHz
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 G21
–50°C
25°C
125°C
150°C
CATCH DIODE CURRENT (mA)
0
CATCH DIODE, V
F
(V)
0.4
0.6
400
3990 G22
0.2
0
100
200
300
1.0
0.8
–50°C
25°C
125°C
150°C
TEMPERATURE (°C)
–50
CATCH DIODE LEAKAGE (µA)
8
12
15
25 75 150
3990 G23
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 G24
75 100 125 150
TEMPERATURE (°C)
–50
1.140
THRESHOLD VOLTAGE (V)
1.165
1.190
1.215
1.240
–25 0 25 50
3990 G25
75 100 125 150
V
OUT
100mV/DIV
I
L
100mA/DIV
100µs/DIV
FRONT PAGE APPLICATION
V
IN
= 12V
V
OUT
= 5V
3990 G26
V
OUT
100mV/DIV
I
L
100mA/DIV
100µs/DIV
FRONT PAGE APPLICATION
V
IN
= 12V
V
OUT
= 5V
3990 G27