LTC3738 Datasheet, PDF (5/32 Pages) Linear Technology – 3-Phase Buck Controller for Intel VRM9/VRM10 with Active Voltage Positioning

LTC3738
TYPICAL PERFOR A CE CHARACTERISTICS T_A = 25°C unless otherwise noted.
Efficiency vs I_OUT
100
90
V_FCB/SYNC = 5V
80
70
V_FCB/SYNC = OPEN
60
V_FCB/SYNC = 0V
50
40
30
20
10
0
0.1
V_IN = 12V
V_OUT = 1.2V
FREQUENCY = 210kHz
1
10
100
INDUCTOR CURRENT (A)
3738 G01
Reference Voltage
vs Temperature
610
Efficiency vs V_IN
92
V_IN = 12V
91
FREQUENCY = 210kHz
I_L = 20A
90
89
88
I_L = 50A
87
86
85
4 5 6 7 8 9 10 11 12 13 14
V_IN (V)
3733 G02
Error Amplifier g_m
vs Temperature
4.0
Efficiency vs Frequency
92
91
V_IN = 5V
90
89
V_IN = 10V
88
V_IN = 14V
87
86
V_IN = 12V
85 V_OUT = 1.2V
I_LOAD = 20A
84
200 250 300 350 400
FREQUENCY (kHz)
450 500
3738 G03
Maximum I_SENSE Threshold
vs Temperature
85
605
3.5
600
3.0
595
2.5
80
V_O = 1.85V
75
V_O = 0.8V
70
590
–45 –30 –15 0 15 30 45 60 75 90
TEMPERATURE (°C)
3738 G04
Oscillator Frequency
vs Temperature
600
V_PLLFLTR = 5V
550
500
V_PLLFLTR = 2.4V
450
400
350
V_PLLFLTR = 1.2V
300
250
200
V_PLLFLTR = 0V
150
100
–45 –30 –15 0 15 30 45 60 75 90
TEMPERATURE (°C)
3738 G07
2.0
–45 –30 –15 0 15 30 45 60 75 90
TEMPERATURE (°C)
3738 G05
Oscillator Frequency vs V_PLLFLTR
550
500
450
400
350
300
250
200
0
0.4 0.8 1.2 1.6 2.0 2.4
V_PLLFLTR (V)
3738 G08
65
–45 –30 –15 0 15 30 45 60 75 90
TEMPERATURE (°C)
3738 G06
Undervoltage Reset Voltage
vs Temperature
5.0
4.5
4.0
3.5
3.0
–45 –30 –15 0 15 30 45 60 75 90
TEMPERATURE (°C)
3738 G09
3738f
5