LTC3425 Linear Technology, LTC3425 Datasheet - Page 6

• Manufacturer Part Number: LTC3425
• Description: 5A 8MHz 4-Phase Synchronous Step-Up DC/DC Converter
• Manufacturer: Linear Technology

LTC3425
TYPICAL PERFOR A CE CHARACTERISTICS
6
1.00
0.95
0.90
0.85
0.80
0.75
0.70
350
300
200
150
100
250
100
50
50
90
80
70
60
40
0
–45
1.5
1
Automatic Burst Mode Thresholds
vs V
Maximum Output Current
in Burst Mode Operation
Minimum Start-Up Voltage
vs Temperature
T
A
= 25 C
V
V
–25 –5
1.5
V
OUT
OUT
IN
OUT
V
ENTER Burst Mode OPERATION
LEAVE Burst Mode OPERATION
OUT
2
= 3.3V
= 3.3V
= 5V
2
= 3.3V
TEMPERATURE ( C)
V
2.5
OUT
15
2.5
= 5V
V
V
35
IN
IN
3
(V)
(V)
55
3.5
3
V
OUT
75
T
R
W
A
BURST
4
= 25 C
= 5V
3.5
95 115
4.5
= 33k
3425 G20
3425 G26
3425 G23
U
5
4
11.8
11.7
11.6
11.5
11.4
11.3
11.2
11.1
11.0
10.9
10.8
3.0
2.5
2.0
1.5
1.0
0.5
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
–45
–45
0.9
Soft-Start Charging Current
vs Temperature
Maximum Start-Up Load vs V
(Constant Current Load)
PGOOD Threshold vs Temperature
T
A
–25 –5
= 25 C
–25 –5
1.0
(START-UP MODE)
1.1
TEMPERATURE ( C)
TEMPERATURE ( C)
V
15
V
15
V
IN
OUT
IN
< 2.3V
1.2
> 2.3V
V
35
35
= 3.3V
IN
(V)
1.3
55
55
V
OUT
1.4
75
75
= 5V
95 115
95 115
1.5
IN
3425 G21
3425 G24
3425 G27
1.6
0.450
0.425
0.350
0.325
0.300
0.400
0.375
800
750
700
650
600
550
500
450
400
350
300
100
10
1
–45
–45
10
PMOS Reverse Current in Forced
CCM vs Temperature
Automatic Burst Mode Current
Thresholds vs R
Shutdown Voltage vs Temperature
–25 –5
–25 –5
OPERATION
Burst Mode
www.DataSheet4U.com
BURST RESISTOR (k )
ENTER
TEMPERATURE ( C)
TEMPERATURE ( C)
15
15
35
35
100
BURST
55
LEAVE
Burst Mode
OPERATION
55
75
75
T
95 115
A
95 115
= 25 C
3425 G28
3425 G22
3425 G25
3425f
1000