LTC1628 LINER [Linear Technology], LTC1628 Datasheet - Page 6

• Manufacturer Part Number: LTC1628
• Description: High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators
• Manufacturer: LINER [Linear Technology]

LTC1628/LTC1628-PG
TYPICAL PERFOR A CE CHARACTERISTICS
200mV/DIV
6
10V/DIV
10V/DIV
V
5V/DIV
5V/DIV
2A/DIV
2A/DIV
76
70
RUN/SS
80
78
74
72
V
V
V
I
–50 –25
SW1
SW2
OUT
OUT
V
Maximum Current Sense
Threshold vs Temperature
I
IN
IN
V
V
Soft-Start Up (Figure 13)
Input Source/Capacitor
Instantaneous Current (Figure 13)
V
V
I
OUT5
IN
OUT
IN
OUT
= 15V
= 15V
= 5V
= 5V
= I
OUT3.3
0
TEMPERATURE ( C)
= 2A
25
5ms/DIV
1 s/DIV
50
75
W
100
1628 G17
U
125
1628 G19
1628 G22
200mV/DIV
20mV/DIV
0.5A/DIV
2A/DIV
V
V
3
1
0
4
2
I
I
OUT
OUT
OUT
OUT
0
Dropout Voltage vs Output Current
(Figure 13)
V
V
V
LOAD STEP = 0A TO 3A
Burst Mode OPERATION
OUT
Load Step (Figure 13)
Burst Mode Operation (Figure 13)
V
V
V
I
OUT
IN
OUT
IN
OUT
FCB
0.5
= 15V
= 15V
= 5V
= 20mA
= OPEN
= 5V
= 5V
1.0
OUTPUT CURRENT (A)
R
1.5
SENSE
R
SENSE
2.0
20 s/DIV
10 s/DIV
= 0.010
2.5
= 0.015
3.0
3.5
1628 G18
1628 G20
1628 G23
4.0
200mV/DIV
20mV/DIV
0.5A/DIV
2A/DIV
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
V
V
I
I
0
OUT
OUT
OUT
OUT
–50
RUN/SS Current vs Temperature
Load Step (Figure 13)
V
V
LOAD STEP = 0A TO 3A
CONTINUOUS MODE
Constant Frequency (Burst Inhibit)
Operation (Figure 13)
V
V
V
I
OUT
IN
OUT
IN
OUT
FCB
–25
= 15V
= 15V
= 20mA
= 5V
= 5V
= 5V
0
TEMPERATURE ( C)
25
20 s/DIV
2 s/DIV
50
75
100
1628 G25
1628 G24
1628 G21
125