ltc1709-85 Linear Technology Corporation, ltc1709-85 Datasheet - Page 6

• Manufacturer Part Number: ltc1709-85
• Description: 2-phase, 5-bit Vid, Current Mode, High Efficiency, Synchronous Step-down Switching Regulator
• Manufacturer: Linear Technology Corporation

LTC1709-85
TYPICAL PERFOR A CE CHARACTERISTICS
50mV/DIV
6
–0.1
–0.2
–0.3
–0.4
0/20A
0.0
76
70
80
78
74
72
V
I
OUT
OUT
–50 –25
0
Load Regulation
Maximum Current Sense
Threshold vs Temperature
Load Step
V
FCB = 0V
IN
= 15V, V
1
0
TEMPERATURE ( C)
LOAD CURRENT (A)
OUT
2
25
= 1.6V
20 s/DIV
50
3
75
W
FCB = 0V
V
FIGURE 1
4
IN
100
= 15V
170985 G16
170985 G13
170985 G19
U
125
5
20mV/DIV
V
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
OUT(AC)
1A/DIV
1A/DIV
0.2
2.5
2.0
1.5
1.0
0.5
0
0
–50
I
I
L1
L2
V
0
RUN/SS Current vs Temperature
V
ITH
OSENSE
Burst Mode Operation
V
FCB = OPEN
–25
IN
vs V
1
= 15V, V
= 0.7V
RUN/SS
0
TEMPERATURE ( C)
2
OUT
V
25
RUN/SS
= 1.6V, I
10 s/DIV
3
50
(V)
L
= 200mA
4
75
RMS
100
5
170985 G17
170985 G14
170985 G25
125
6
20mV/DIV
V
V
1V/DIV
2V/DIV
2V/DIV
–100
RUN/SS
OUT(AC)
1A/DIV
1A/DIV
–50
100
V
V
50
OUT
ITH
0
I
I
L1
L2
0
SENSE Pins Total Source Current
Constant Frequency Mode
Soft-Start Up
V
FCB = INTV
IN
V
SENSE
= 15V, V
0.5
COMMON MODE VOLTAGE (V)
CC
OUT
= 1.6V, I
100ms/DIV
2 s/DIV
1
L
= 400mA
1.5
RMS
170985 G15
170985f
170985 G18
170985 G26
2