LTC3738 Datasheet, PDF (7/32 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.
Maximum Current Threshold
Mismatch vs Temperature
3.0
2.5
2.0
1.5
1.0
0.5
0
–45 –30 –15 0 15 30 45 60 75 90
TEMPERATURE (°C)
3738 G19
Shed Mode at 1A,
Light Load Current
V_OUT
10mV/DIV
V_SW1
5V/DIV
V_SW2
5V/DIV
V_SW3
5V/DIV
V_IN = 12V
2µs/DIV
V_OUT = 1.5V
V_FCB = V_CC
FREQUENCY = 210kHz
3738 G21
(V_AVP – V_IN+) vs
(V_SENSE+ – V_SENSE–)
180
135
90
45
0
–45
–15
0
15
30
45
V_SENSE+ – V_SENSE– (mV)
60
3738 G20
Pulse Skip Mode at 1A,
Light Load Current
V_OUT
10mV/DIV
V_SW1
5V/DIV
V_SW2
5V/DIV
V_SW3
5V/DIV
V_IN = 12V
2µs/DIV
V_OUT = 1.5V
V_FCB = OPEN
FREQUENCY = 210kHz
3738 G22
Continuous Mode at 1A,
Light Load Current
V_OUT
10mV/DIV
V_SW1
5V/DIV
V_SW2
5V/DIV
V_SW3
5V/DIV
V_IN = 12V
2µs/DIV
V_OUT = 1.5V
V_FCB = GND
FREQUENCY = 210kHz
3738 G23
Load Transient with AVP
V_OUT
50mV/DIV
∆I_OUT
100A STEP
dI/dt > 200A/µs
80mV
INTEL
SPEC
V_IN = 12V
V_OUT = 1.35V
C_OUT = 10 × 330µF/2.5V
SANYO TPE POSCAP
+ 18 × 22µF/X5R CERAMIC
3738 G24
3738f
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