Datasheet

6
LTC1628/LTC1628-PG
1628fb
TEMPERATURE (°C)
–50 –25
70
V
SENSE
(mV)
74
80
0
50
75
1628 G17
72
78
76
25
100
125
OUTPUT CURRENT (A)
0
0
DROPOUT VOLTAGE (V)
1
2
3
4
0.5 1.0 1.5 2.0
1628 G18
2.5 3.0 3.5 4.0
R
SENSE
= 0.015Ω
R
SENSE
= 0.010Ω
V
OUT
= 5V
Maximum Current Sense
Threshold vs Temperature
Dropout Voltage vs Output Current
(Figure 13)
Soft-Start Up (Figure 13)
V
OUT
5V/DIV
V
RUN/SS
5V/DIV
I
OUT
2A/DIV
V
IN
= 15V 5ms/DIV 1628 G19
V
OUT
= 5V
Load Step (Figure 13)
V
OUT
200mV/DIV
I
OUT
2A/DIV
V
IN
= 15V 20µs/DIV 1628 G20
V
OUT
= 5V
LOAD STEP = 0A TO 3A
Burst Mode OPERATION
Load Step (Figure 13)
V
OUT
200mV/DIV
I
OUT
2A/DIV
V
IN
= 15V 20µs/DIV 1628 G21
V
OUT
= 5V
LOAD STEP = 0A TO 3A
CONTINUOUS MODE
RUN/SS Current vs Temperature
TEMPERATURE (°C)
–50 –25
0
RUN/SS CURRENT (µA)
0.2
0.6
0.8
1.0
75 10050
1.8
1628 G25
0.4
0 25 125
1.2
1.4
1.6
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Load Regulation
LOAD CURRENT (A)
0
NORMALIZED V
OUT
(%)
–0.2
–0.1
4
1628 G13
–0.3
–0.4
1
2
3
5
0.0
FCB = 0V
V
IN
= 15V
FIGURE 1
V
ITH
vs V
RUN/SS
V
RUN/SS
(V)
0
0
V
ITH
(V)
0.5
1.0
1.5
2.0
2.5
1
234
1628 G14
56
V
OSENSE
= 0.7V
SENSE Pins Total Source Current
V
SENSE
COMMON MODE VOLTAGE (V)
0
I
SENSE
(µA)
0
1628 G15
–50
–100
24
50
100
6