Datasheet

6
LTC1628-SYNC
1628syncfa
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 14)
Soft-Start Up (Figure 14)
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 14)
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 14)
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
Input Source/Capacitor
Instantaneous Current (Figure 14)
I
IN
2A/DIV
V
IN
200mV/DIV
V
SW1
10V/DIV
V
IN
= 15V 1µs/DIV 1628 G22
V
OUT
= 5V
I
OUT5
= I
OUT3.3
= 2A
Burst Mode Operation (Figure 14)
V
OUT
20mV/DIV
I
OUT
0.5A/DIV
V
IN
= 15V 10µs/DIV 1628 G23
V
OUT
= 5V
V
FCB
= OPEN
I
OUT
= 20mA
Constant Frequency (Burst Inhibit)
Operation (Figure 14)
V
OUT
20mV/DIV
I
OUT
0.5A/DIV
V
IN
= 15V 2µs/DIV 1628 G24
V
OUT
= 5V
V
FCB
= 5V
I
OUT
= 20mA
V
SW2
10V/DIV
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