Datasheet

LT3435
5
3435fa
INPUT VOLTAGE (V)
5
0
LOAD CURRENT (mA)
200
1000
500
15
3435 G16
100
400
300
600
900
800
700
10 20
V
OUT
= 3.3V
L = 15µH
C
OUT
= 100µF
T
A
= 25°C
BURST MODE EXIT
(INCREASING LOAD)
BURST MODE ENTER
(DECREASING LOAD)
Switch Peak Current Limit
Soft-Start Current Threshold
vs FB Voltage
Oscillator Frequency
vs FB Voltage
Switch On Voltage (V
CESAT
) Minimum Input Voltage
TYPICAL PERFOR A CE CHARACTERISTICS
UW
TEMPERATURE (°C)
–50
3.0
3.5
4.0
PEAK SWITCH CURRENT (A)
4.5
5.0
5.5
6.0
–25 –0 25 50
3435 G10
75 100 125
FB VOLTAGE (V)
0
0
CURRENT (µA)
10
20
30
0.2
0.4
0.6 0.8
3435 G11
1.0
40
50
5
15
25
35
45
1.2
SOFT-START
DEFEATED
T
J
= 25°C
FB VOLTAGE (V)
0
0
NORMALIZED FREQUENCY (%)
20
30
40
50
60
70
80
90
10
0.25 0.50 0.75
3435 G12
1.00
100
1.25
LOAD CURRENT (A)
0.5
0
VOLTAGE (mV)
50
150
200
250
500
350
1.5
2.5
3435 G13
100
400
450
300
1.0 2.0 3.0
T
J
= 125°C
T
J
= 25°C
T
J
= –40°C
LOAD CURRENT (A)
0
3.0
INPUT VOLTAGE (V)
3.5
4.5
5.0
5.5
2.0
8.0
7.5
3435 G15
4.0
1.0
0.5
2.5
1.5 3.0
6.0
6.5
7.0
RUNNING
START-UP
START-UP
V
OUT
= 5V
V
OUT
= 3.3V
RUNNING
Burst Mode Threshold vs Input
Voltage
Maximum Synchronization
Frequency vs Temperature Boost Current vs Switch Current
SWITCH CURRENT (mA)
0
0
BOOST CURRENT (mA)
10
30
2000
70
60
3435 G18
20
1000
500
2500
1500 3000
40
50
TEMPERATURE (°C)
–50
100
ON TIME (ns)
150
250
300
350
600
450
0
50
75
3435 G17
200
500
550
400
–25
25
100
125
LOAD CURRENT = 1A
Minimum On-Time for Continuous
Mode Operation
TEMPERATURE (°C)
–50
500
FREQUENCY (kHz)
550
650
700
750
1000
850
0
50
75
3435 G14
600
900
950
800
–25
25
100
125