3PHASEPWM datasheet(3/5 Pages) IRF

3 / 5 page

Figure 1 – Typical application of IRU3055

The IRU3055 has on-board MOSFET drivers,

making

cost-effective

compared

the

majority

multiphase

controllers,

which

require external MOSFET drivers. When used

with IR’s HEXFET

® power MOSFETs like the

IRF3704S in the control FET socket and the

IRF3711S in the synchronous FET socket, the

IRU3055

can

provide

60A

for

microprocessor VCORE requirements at 80%

efficiency or above.

The new controller IC is a fixed-frequency

voltage mode controller with 50kHz to 500kHz

programmable operating frequency by using an

external resistor. The output voltage is selectable

in 25mV steps from 1.075 to 1.85V with up to

1.5%

output

voltage

accuracy

using

programmable VID code to the five-bit digital-

to-analog converter (DAC).

The new device has a number of features to

provide protection and monitoring for the power

system and the microprocessor. It features

under-voltage lockout (UVLO) for the 5V and

12V

supplies

well

externally

programmable

soft-start

function.

Another

feature is the PGOOD monitor circuit, which is

held low if the output of the converter is not

within

±10% of the programmed voltage.

The

IRU3055

also

provides

over-voltage

protection. If the output voltage exceeds the

DAC-programmed voltage by 20%, the low-side

MOSFETs turn on and shunt the output voltage

to ground, protecting the CPU from damage.

The IRU3055 features loss-less inductor current

sensing

and

sharing

while

over-current

protection is achieved by synchronous FET

RDS(on)

sensing, eliminating the need for a

separate sense resistor. The IRU3055 can also be

easily

configured

for

voltage

droop

compensation so that the output voltage will

linearly decrease as load current increases and

vice versa, as required by Intel VRM design

guidelines.

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