LTC3733 Datasheet, PDF (5/32 Pages) Linear Technology – 3-Phase, Buck Controllers for AMD CPUs

TYPICAL PERFOR A CE CHARACTERISTICS
LTC3733/LTC3733-1
Efficiency vs I_OUT
100
90 ^VFCB ^{= OPEN}
80
70
60
V_FCB = 5V
50
40
V_FCB = 0V
30
20
10
0
0.1
V_IN = 8V
V_OUT = 1.5V
1
10
100
INDUCTOR CURRENT (A)
3733 G01
Reference Voltage vs
Temperature
610
Efficiency vs V_IN
100
V_OUT = 1.5V
f = 210kHz
95
I_L = 20A
90
I_L = 50A
85
80
75
70
0
5
10
15
V_IN (V)
Error Amplifier g_m vs
Temperature
4.0
20
25
3733 G02
605
3.5
600
3.0
595
2.5
590
–45 –30 –15 0 15 30 45 60 75 90
TEMPERATURE (°C)
3733 G04
Oscillator Frequency vs
Temperature
600
550
500
V_PLLFLTR = 2.4V
450
V_PLLFLTR = 5V
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)
3733 G07
2.0
–45 –30 –15 0 15 30 45 60 75 90
TEMPERATURE (°C)
3733 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)
3733 G08
Efficiency vs Frequency
100
V_OUT = 1.5V
I_LOAD = 20A
97
V_IN = 8V
94
V_IN = 5V
91
V_IN = 12V
88
V_IN = 20V
85
200 250 300 350 400 450 500 550
FREQUENCY (kHz)
3733 G03
Maximum I_SENSE Threshold vs
Temperature
85
80
V_O = 1.55V
75
V_O = 0.8V
70
65
–45 –30 –15 0 15 30 45 60 75 90
TEMPERATURE (°C)
3733 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)
3733 G09
3733f
5