LTC3731H_15 Datasheet, PDF (5/34 Pages) Linear Technology – 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller

Typical Performance 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
LOAD CURRENT (A)
100
3731H G01
Reference Voltage
vs Temperature
610
Efficiency vs V_IN (Figure 14)
100
V_OUT = 1.5V
95
f = 225kHz
90
I_L = 15A
85
I_L = 45A
80
75
70
65
60
55
50
0
5
10
15
20
25
V_IN (V)
3731H G02
Error Amplifier g_m
vs Temperature
6.0
LTC3731H
Efficiency vs Frequency
(Figure 14)
100
I_LOAD = 20A
V_OUT = 1.5V
95
V_IN = 5V
90
V_IN = 12V
85
V_IN = 8V
V_IN = 20V
80
75
200
300
400
500
FREQUENCY (kHz)
600
3731H G03
Maximum I_SENSE Threshold
vs Temperature
85
605
5.5
80
600
5.0
V_O = 1.75V
75
V_O = 0.6V
595
4.5
70
590
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3731H G04
Oscillator Frequency
vs Temperature
700
600 ^{VPLLFLTR = 2.4V}
V_PLLFLTR = 5V
500
400
V_PLLFLTR = 1.2V
300
200 _{VPLLFLTR = 0V}
100
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3731H G07
4.0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3731H 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)
3731H G08
65
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3731H G06
Undervoltage Reset Voltage
vs Temperature
5
4
3
2
1
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3731H G09
3731Hfb