Datasheet

LT3579/LT3579-1
5
35791fa
For more information www.linear.com/LT3579
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Current Limit
vs Temperature Commanded Switch Current vs SS Positive Feedback Voltage
Oscillator Frequency
Oscillator Frequency During
Soft-Start CLKOUT Duty Cycle
Switch Current Limit Switch Saturation Voltage
Switch Current Sharing
DUTY CYCLE (%)
20
0
SW1 + SW2 CURRENT (A)
6
7
8
9
5
4
3
2
1
10
60 70 8030 40
35791 G01
50
SW1 + SW2 CURRENT (A)
0
0
SATURATION VOLTAGE (mV)
300
250
150
200
100
50
350
4 5 6 7 81 2
35791 G02
3
V
SW1
= V
SW2
SW1 CURRENT (A)
0
0.0
0.1
I
SW2
/I
SW1
(A/A)
0.8
0.9
0.6
0.7
0.4
0.5
0.2
0.3
1.0
3 3.5 41 1.50.5
35791 G03
2 2.5
TEMPERATURE (°C)
–50
0
SW1 + SW2 CURRENT (A)
8
9
7
6
5
4
3
2
1
10
–25 75 100 125 1500 25
35791 G04
50
T
A
= 25°C, unless otherwise noted.
SS VOLTAGE (V)
0
0
SW1 + SW2 CURRENT (A)
9
5
6
7
8
4
3
2
1
10
0.6 0.8 1 1.20.2
35791 G05
0.4
TEMPERATURE (°C)
–50
1.2
FB VOLTAGE (V)
1.225
1.22
1.215
1.21
1.205
1.23
–25 50 75 100 125 1500
35791 G06
25
TEMPERATURE (°C)
–50
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
FREQUENCY (MHz)
3.0
–25 100 125 1500 25 50
35791 G07
75
R
T
= 432k
R
T
= 34k
FB VOLTAGE (V)
0
0
NORMALIZED OSCILLATOR FREQUENCY (F
SW
/F
NOM
)
1/6
1/5
1/4
1/3
1/2
1
0.6 0.8 1 1.20.2 0.4
35791 G08
BOOSTING
CONFIGURATIONS
INVERTING
CONFIGURATIONS
TEMPERATURE (°C)
–50
0
CLKOUT DUTY CYCLE (%)
70
60
50
40
30
20
80
–25 75 100 125 1500 25
35791 G09
50