IR35211 datasheet(49/58 Pages) IRF

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Dual Output Digital Multi-Phase Controller

IR35211

July 24, 2014 | V1.00

The designer may also configure a maximum Vout

(Table 60) to protect the VR from exceeding the

programmed voltage regardless of the commanded

VID and offset. The Gamer command may be used to

set the controller to either override or track CPU DVID

commands. In Override mode, the IR35211 sets the

output voltage defined by the Gamer VID and ignores

the VIDs from the CPU. In Track mode, the output

voltage is initially set to the Gamer VID and any

subsequent changes to the CPU VID cause the same

offset changes in the Gamer VID.

The IR35211 Gamer command also provides

overclockers the ability to minimize droop by digitally

scaling the load line to 80%, 60% or 0% (disable) of

the nominal value.

A summary of the PMBus Gamer command is shown

in Table 59.

TABLE 59: GAMER COMMAND FORMAT

Bits

Function

15-13

Reserved. Always set to “001”b

Gamer Mode Enable/Disable

VID Follow or VID Override Mode

10:9

Load line scale 100%, 80%, 60%, 0%

8:0

Gamer VID[8:0]

TABLE 60: OVERCLOCK VMAX

Value

Vmax (AMD)

Vmax (Intel)

0.800

0.645

0.913

0.765

1.025

0.885

1.138

1.005

1.250

1.125

1.363

1.245

1.475

1.365

1.588

1.485

1.700

1.605

1.813

1.725

1.925

1.845

2.038

1.965

2.150

2.085

2.263

2.205

2.375

2.325

2.488

2.445

Overclock Mode Recovery

Raising the CPU voltage to achieve higher

performance or lowering the CPU voltage to save

power can result in a system crash. The IR35211

contains a safety mechanism whereby the Overclock

Mode is immediately disabled any time the ENABLE

pin is driven low (typically by a system restart). This

ensures that the CPU starts at the proper boot VID.

Doubler/Quad Configurations

The IR35211 supports doubler or quad configurations

by allowing the nominal pulse width to increase when

phases are operated in conjunction with a doubler or

quad driver such as the IR3598. The user only needs

to double or quadruple the switching freqency from

the normal mode switching frequency to run in doubler

or quad mode, while maintaining the calculated pulse

width register (k_vref) at the same value it would be in

normal mode. This effectively allows the nominal

pulse width to double or quadruple relative to the

switching period and produce the desired output

voltage. Proper input current reporting is maintained

by a register bit adjustment that tells the controller that

the VR is operating in normal, doubler, or quad

modes. See an IR application note on phase doubling

and quadrupling for more information.

IR35211 Datasheet(PDF) 49 Page - International Rectifier

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