Datasheet

LTC3425
6
3425f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Maximum Output Current
in Burst Mode Operation
V
IN
(V)
1 1.5
OUTPUT CURRENT (mA)
200
250
300
4
3425 G20
150
100
23
4.5
2.5 3.5 5
50
0
350
V
OUT
= 3.3V
V
OUT
= 5V
T
A
= 25°C
V
IN
(V)
0.9
0.4
0.5
0.7
1.2 1.4
3425 G21
0.3
0.2
1.0 1.1
1.3 1.5 1.6
0.1
0
0.6
LOAD CURRENT (A)
T
A
= 25°C
V
OUT
= 3.3V
V
OUT
= 5V
Maximum Start-Up Load vs V
IN
(Constant Current Load)
Soft-Start Charging Current
vs Temperature
Automatic Burst Mode Current
Thresholds vs R
BURST
BURST RESISTOR (kΩ)
10
1
AVERAGE LOAD CURRENT (mA)
10
100
100 1000
3425 G22
T
A
= 25°C
ENTER
Burst Mode
OPERATION
LEAVE
Burst Mode
OPERATION
V
IN
(V)
1.5
LOAD CURRENT (mA)
70
80
90
100
3.5
3425 G23
60
50
40
2
2.5
3
4
V
OUT
= 5V
T
A
= 25°C
R
BURST
= 33k
V
OUT
= 5V
V
OUT
= 3.3V
LEAVE Burst Mode OPERATION
ENTER Burst Mode OPERATION
V
OUT
= 3.3V
TEMPERATURE (°C)
–45
0
SS CHARGE CURRENT (µA)
0.5
1.0
1.5
2.0
3.0
–25
–5 15 35 7555
3425 G24
95 115
2.5
V
IN
> 2.3V
V
IN
< 2.3V
(START-UP MODE)
Automatic Burst Mode Thresholds
vs V
IN
PGOOD Threshold vs Temperature
Shutdown Voltage vs Temperature
Minimum Start-Up Voltage
vs Temperature
TEMPERATURE (°C)
–45
0.300
SHUTDOWN VOLTAGE (V)
0.325
0.350
0.375
0.400
0.450
–25
–5 15 35 7555
3425 G25
95 115
0.425
TEMPERATURE (°C)
–45
0.70
START VOLTAGE (V)
0.75
0.80
0.85
0.90
1.00
–25
–5 15 35 7555
3425 G26
95 115
0.95
TEMPERATURE (°C)
–45
10.8
PGOOD THRESHOLD (1% BELOW V
FB
)
11.0
10.9
11.1
11.5
11.4
11.3
11.2
11.6
11.8
–25
–5 15 35 7555
3425 G27
95 115
11.7
PMOS Reverse Current in Forced
CCM vs Temperature
TEMPERATURE (°C)
–45
300
PMOS REVERSE CURRENT (mA)
400
350
450
650
600
550
500
700
800
–25
–5 15 35 7555
3425 G28
95 115
750