Datasheet

LT3991/LT3991-3.3/LT3991-5
5
3991fa
Typical perForMance characTerisTics
Switch Current Limit
Switch Current Limit
Switch V
CESAT
Boost Pin Current
LT3991 Frequency Foldback
Load Regulation
Switching Frequency
T
A
= 25°C, unless otherwise noted.
Maximum Load Current
Maximum Load Current
INPUT VOLTAGE (V)
LOAD CURRENT (A)
3991 G08
3.0
0.5
1.0
1.5
2.0
2.5
0
5 5525 30 35 40 45 50
TYPICAL
MINIMUM
201510
V
OUT
= 3.3V
INPUT VOLTAGE (V)
LOAD CURRENT (A)
3991 G09
2.5
0.5
1.0
1.5
2.0
0
5 5525 30 35 40 45 50
TYPICAL
MINIMUM
201510
V
OUT
= 5V
LOAD CURRENT (mA)
LOAD REGULATION (%)
3991 G10
0.30
–0.25
–0.20
–0.15
–0.10
–0.05
0.20
0.15
0.10
0.05
0
0.25
–0.30
0 1200600 800 1000400200
REFERENCED FROM V
OUT
AT 0.5A LOAD
TEMPERATURE (°C)
FREQUENCY (kHz)
3991 G11
1000
650
900
850
800
750
700
950
600
–55 15535 65 125955–25
DUTY CYCLE (%)
SWITCH CURRENT LIMIT (A)
3991 G12
3.0
2.0
1.5
1.0
0.5
2.5
0
0 10060 804020
TEMPERATURE (°C)
SWITCH CURRENT LIMIT (A)
3991 G13
2.5
2.4
2.3
2.2
2.1
2.0
1.5
1.6
1.7
1.8
1.9
–55 –25 1551259565355
DUTY CYCLE = 30%
SWITCH CURRENT (mA)
V
CESAT
(mV)
3991 G14
700
400
300
200
100
500
600
0
0 1500500 750 1000 1250250
SWITCH CURRENT (mA)
BOOST PIN CURRENT (mA)
3991 G15
45
20
15
10
5
25
30
35
40
0
0 1500500 750 1000 1250250
FB PIN VOLTAGE (V)
0
SWITCHING FREQUENCY (kHz)
900
800
400
200
500
600
700
300
100
0
0.80.4
3991 G16
1.20.60.2 1