LTC3728 Datasheet, PDF (5/32 Pages) Linear Technology – Dual, 550kHz, 2-Phase Synchronous Step-Down Switching Regulator

TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Input Voltage
and Mode (Figure 13)
1000
800
600
BOTH
CONTROLLERS ON
400
200
SHUTDOWN
0
0 5 10 15 20 25 30 35
INPUT VOLTAGE (V)
3728 G04
Internal 5V LDO Line Regulation
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)
3728 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
3728 G10
EXTV_CC Voltage Drop
250
200
150
100
50
0
0
10
20
30
40
50
CURRENT (mA)
3728 G05
Maximum Current Sense Threshold
vs Duty Factor
75
50
25
0
0
20
40
60
80
100
DUTY FACTOR (%)
3728 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)
3728 G11
LTC3728
INTV_CC and EXTV_CC Switch
Voltage vs Temperature
5.05
INTV_CC VOLTAGE
5.00
4.95
4.90
4.85
4.80
EXTV_CC SWITCHOVER THRESHOLD
4.75
4.70
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
3728 G06
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 (%)
3728 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)
3728 G12
3728fb
5