LTC3731 Datasheet, PDF (6/32 Pages) Linear Technology – 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller

LTC3731
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs I_OUT (Figure 14)
100
90 ^VFCB ^{= OPEN}
80 ^VFCB ^{= 5V}
70
V_FCB = 0V
60
50
40
30
20
10
0
0.1
V_IN = 8V
V_OUT = 1.5V
1
10
INDUCTOR CURRENT (A)
100
3731 G01
Reference Voltage vs
Temperature
610
Efficiency vs V_IN (Figure 14)
100
V_OUT = 1.5V
95
f = 250kHz
90
I_L = 15A
85
I_L = 45A
80
75
70
65
60
55
50
0
5
10
15
20
25
V_IN (V)
3731 G02
Error Amplifier gm vs
Temperature
6.0
Efficiency vs Frequency (Figure 14)
100
95
V_IN = 5V
I_LOAD = 20A
V_OUT = 1.5V
90
V_IN = 12V
85
V_IN = 8V
V_IN = 20V
80
75
200
300
400
500
FREQUENCY (kHz)
600
3731 G03
Maximum I_SENSE Threshold vs
Temperature
85
605
5.5
80
V_O = 1.75V
600
5.0
75
V_O = 0.6V
595
4.5
70
590
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3731 G04
Oscillator Frequency vs
Temperature
700
600 ^{VPLLFLTR = 2.4V}
500
V_PLLFLTR = 5V
400
V_PLLFLTR = 1.2V
300
200 _{VPLLFLTR = 0V}
100
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3731 G07
4.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3731 G05
Operating Frequency vs V_PLLFLTR
700
600
500
400
300
200
0
0.5
1
1.5
2
2.5
PLLFLTR PIN VOLTAGE (V)
3731 G08
65
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3731 G06
Undervoltage Reset Voltage vs
Temperature
5
4
3
2
1
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3731 G09
3731fa
6