LT3581 LINER [Linear Technology], LT3581 Datasheet - Page 5

• Manufacturer Part Number: LT3581
• Description: 3.3A Boost/Inverting DC/DC Converter with Fault Protection
• Manufacturer: LINER [Linear Technology]

Typical perForMance characTerisTics
3200
2800
2400
2000
1600
1200
800
400
0
6
5
4
3
2
1
0
6
5
4
3
2
1
0
–50 –25
–50 –25
20
Switch Fault Current Limit vs
Duty Cycle
Switch Fault Current Limit vs
Temperature
Oscillator Frequency
30
0
0
R
TEMPERATURE (°C)
R
TEMPERATURE (°C)
40
T
DUTY CYCLE (%)
T
= 432k
25
= 34k
25
50
50
50
75
75
60
100
100
70
125 150
125 150
3581 G01
3581 G04
3581 G07
80
1.2200
1.2175
1.2150
1.2125
1.2100
450
400
350
300
250
200
150
100
1/4
1/5
1/6
1/3
1/2
50
0
1
0
–50 –25
0
0
Switch Saturation Voltage with
SW1 and SW2 Tied Together
Positive Feedback Voltage
vs Temperature
Frequency Foldback
CONFIGURATIONS
INVERTING
0.2
1
SW1 + SW2 CURRENT (A)
0
TEMPERATURE (°C)
0.4
FB VOLTAGE (V)
25
2
0.6
50
CONFIGURATIONS
3
75
BOOSTING
0.8
100
4
1.0
125 150
T
3581 G08
3581 G02
3581 G05
A
= 25°C, unless otherwise noted.
1.2
5
1000
900
800
700
600
500
400
300
200
100
100
90
80
70
60
50
40
30
20
10
80
70
60
50
40
30
20
10
0
0
–75 –50 –25
0
0
Current Sharing Between SW1 and
SW2 When Tied Together
CLKOUT Duty Cycle
vs Temperature
Gate Current vs Gate Voltage
1
SW1 + SW2 CURRENT (A)
20
TEMPERATURE (°C)
–40°C
GATE VOLTAGE (V)
0
2
25
40
25°C
50
3
LT3581
75 100
60
125°C
4
125 150
3581 G09
3581 G03
3581 G06

3581f
80
5