LT3434 LINER [Linear Technology], LT3434 Datasheet - Page 5

• Manufacturer Part Number: LT3434
• Description: High Voltage 3A, 200kHz Step-Down Switching Regulator with 100uA Quiescent Current
• Manufacturer: LINER [Linear Technology]

TYPICAL PERFOR A CE CHARACTERISTICS
300
900
800
700
600
500
400
300
200
100
500
450
400
350
250
200
150
100
6.0
5.5
5.0
4.5
4.0
3.5
3.0
50
0
0
–50
0.5
5
Switch Peak Current Limit
Switch On Voltage (V
Burst Mode Threshold vs Input
Voltage
V
L = 33µH
C
OUT
OUT
–25
= 3.3V
= 100µF
1.0
BURST MODE EXIT
(INCREASING LOAD)
–0
INPUT VOLTAGE (V)
TEMPERATURE (°C)
LOAD CURRENT (A)
10
1.5
25
BURST MODE ENTER
(DECREASING LOAD)
50
T
2.0
J
= 125°C
CESAT
15
75
T
J
W
T
= –40°C
)
2.5
J
= 25°C
100
3434 G21
3434 G13
3434 G10
U
125
3.0
20
150
125
100
700
650
600
550
500
450
400
350
300
250
200
75
50
45
40
35
30
25
20
15
10
50
25
0
5
0
–50
0
0
Minimum On Time for Continuous
Mode Operation
Soft-Start Threshold
vs FB Voltage
Supply Current vs Input Voltage
T
LOAD CURRENT = 2A
J
LOAD CURRENT = 1A
LOAD CURRENT = 0.5A
= 25°C
–25
0.2
10
–0
INPUT VOLTAGE (V)
TEMPERATURE (°C)
0.4
20
FB VOLTAGE (V)
25
0.6
30
50
0.8
40
SOFT-START
DEFEATED
75
V
OUT
1.0
50
100
= 3.3V
3434 G20
3434 G11
3434 G22
125
1.2
60
250
200
150
100
8.0
7.5
6.5
6.0
5.5
5.0
4.0
7.0
4.5
3.5
3.0
70
60
50
40
30
20
10
50
0
0
0
0
Oscillator Frequency
vs FB Voltage
0
Minimum Input Voltage
Boost Current vs Load Current
T
J
= 25°C
START-UP
0.2
0.5
0.5
LOAD CURRENT (A)
LOAD CURRENT (A)
1.0
0.4
1.0
FB VOLTAGE (V)
V
RUNNING
OUT
0.6
1.5
1.5
= 3.3V
LT3434
2.0
0.8
2.0
RUNNING
START-UP
V
OUT
2.5
2.5
1.0
3434 G19
3434 G23
3434 G12
= 5V
5
3434f
3.0
3.0
1.2