LTC3727LX-1_15 Datasheet, PDF (5/28 Pages) Linear Technology – High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator

TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Input Voltage
and Mode (Figure 13)
1000
800
BOTH
CONTROLLERS ON
600
400
200
0
0
SHUTDOWN
10
20
INPUT VOLTAGE (V)
30 32
3727LX1 G04
Maximum Current Sense Threshold
vs Duty Factor
150
125
100
75
50
25
0
0
20
40
60
80
100
DUTY FACTOR (%)
3727LX1 G07
Current Sense Threshold
vs I_TH Voltage
150
125
100
75
50
25
0
–25
–50
0
0.5
1.0
1.5
2.0 2.5
V_ITH (V)
3727LX1 G10
EXTV_CC Voltage Drop
160
V_EXTVCC = 8.5V
140
120
100
80
60
40
20
0
0
10
20
30
CURRENT (mA)
40
50
3727LX1 G05
Maximum Current Sense Threshold
vs Percent of Nominal Output
Voltage (Foldback)
150
135
120
105
90
75
60
45
30
15
0
0
20
40
60
80 100
PERCENT OF NOMINAL OUTPUT VOLTAGE (%)
3727LX1 G08
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)
3727LX1 G11
LTC3727LX-1
Internal 7.5V LDO Line Regulation
7.7
I_LOAD = 1mA
7.6
7.5
7.4
7.3
7.2
7.1
7.0
6.9
6.8
0 5 10 15 20 25 30 32
INPUT VOLTAGE (V)
3727LX1 G06
Maximum Current Sense Threshold
vs V_RUN/SS (Soft-Start)
150
V_SENSE(CM) = 1.6V
125
100
75
50
01
2
3
4
5
6
V_RUN/SS (V)
3727LX1 G09
V_ITH vs V_RUN/SS
2.5
V_OSENSE = 0.7V
2.0
1.5
1.0
0.5
0
0
1
2
3
4
V_RUN/SS (V)
56
3727LX1 G12
3727lx1fa
5