lt3580ems8e-trpbf Linear Technology Corporation, lt3580ems8e-trpbf Datasheet - Page 4

• Manufacturer Part Number: lt3580ems8e-trpbf
• Description: Boost/inverting Dc/dc Converter With 2a Switch, Soft-start, And Synchronization
• Manufacturer: Linear Technology Corporation

LT3580
TYPICAL PERFORMANCE CHARACTERISTICS
4
3.0
2.5
2.0
1.5
1.0
0.5
2.7
2.5
2.3
2.1
1.9
1.7
1.5
1.3
1.1
2.0
1.5
0.5
2.5
1.0
0
0
–50
–50
10
Switch Current Limit at 1MHz
Switch Current Limit at Minimum
Duty Cycle
Oscillator Frequency
20
30
0
TEMPERATURE (°C)
TEMPERATURE (°C)
0
R
DUTY CYCLE (%)
R
T
40
T
= 35.7k
= 75k
50
50
50
60
70
100
80
100
3580 G04
3580 G07
3580 G01
90
1.22
1.24
1.23
1.21
1.20
1.19
400
350
300
250
200
150
100
1/4
1/3
1/2
50
0
1
0
–50 –25
0
Switch Saturation Voltage
Positive Feedback Voltage
Oscillator Frequency During
Soft-Start
0
CONFIGURATIONS
INVERTING
0.2
0.5
SWITCH CURRENT (A)
0
TEMPERATURE (°C)
0.4
FB VOLTAGE (V)
T
A
25
= 35°C
T
T
A
A
0.6
= 25°C
1
= 100°C
50
CONFIGURATIONS
BOOSTING
0.8
75
1.5
1.0
100
T
3580 G02
3580 G05
3580 G08
A
= 25°C unless otherwise specifi ed
125
1.2
2
AC COUPLED
50mV/DIV
0.5A/DIV
10V/DIV
V
V
2.32
2.20
2.40
2.38
2.36
2.34
2.30
2.28
2.26
2.24
2.22
OUT
2.5
2.0
1.5
1.0
0.5
SW
I
0
L
–50
0
Switch Current Limit at Minimum
Duty Cycle
Switching Waveforms for
Figure 14 Circuit
Internal UVLO
200
0
TEMPERATURE (°C)
400
SS VOLTAGE (mV)
200ns/DIV
600
50
800
1000 1200
100
3580 G03
3580 G06
3580 G09
3580fa