LTC1628 Datasheet, PDF (5/32 Pages) Linear Technology – High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators

LTC1628/LTC1628-PG
TYPICAL PERFOR A CE CHARACTERISTICS
Internal 5V LDO Line Reg
5.1
I_LOAD = 1mA
5.0
4.9
4.8
4.7
4.6
4.5
4.4
0
5 10 15 20 25 30 35
INPUT VOLTAGE (V)
1628 G07
Maximum Current Sense Threshold
vs V_RUN/SS (Soft-Start)
80
V_SENSE(CM) = 1.6V
60
40
20
0
01
2
34
V_RUN/SS (V)
5
6
1628 G10
Load Regulation
0.0
–0.1
FCB = 0V
V_IN = 15V
FIGURE 1
–0.2
–0.3
–0.4
0
1
2
3
4
5
LOAD CURRENT (A)
1628 G13
Maximum Current Sense Threshold
vs Duty Factor
75
50
25
0
0
20
40
60
80
100
DUTY FACTOR (%)
1628 G08
Maximum Current Sense Threshold
vs Sense Common Mode Voltage
80
76
72
68
64
60
0
1
2
3
4
5
COMMON MODE VOLTAGE (V)
1628 G11
V_ITH vs V_RUN/SS
2.5
V_OSENSE = 0.7V
2.0
1.5
1.0
0.5
0
012
3
4
V_RUN/SS (V)
56
1628 G14
Maximum Current Sense Threshold
vs Percent of Nominal Output
Voltage (Foldback)
80
70
60
50
40
30
20
10
0
0
25
50
75
100
PERCENT ON NOMINAL OUTPUT VOLTAGE (%)
1628 G09
Current Sense Threshold
vs I_TH Voltage
90
80
70
60
50
40
30
20
10
0
–10
–20
–30
0
0.5
1
1.5
2
2.5
V_ITH (V)
1628 G12
SENSE Pins Total Source Current
100
50
0
–50
–100
0
2
4
6
V_SENSE COMMON MODE VOLTAGE (V)
1628 G15
5