L6713ATR datasheet(28/64 Pages) STMICROELECTRONICS

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Configuring the device

L6713A

28/64

Configuring the device

Number of phases and multiple DACs need to be configured before the system starts-up by

programming the apposite pin PHASE_SEL and SS/LTBG/AMD pin.

The configuration of this pin identifies two main working areas (See Table 12) distinguishing

between compliancy with Intel VR10,VR11 or AMD 6BIT specifications. According to the

main specification considered, further customizations can be done: main differences are

regarding the DAC table, soft-start implementation, protection management and Dynamic

VID Transitions. See Table 13 and See Table 14 for further details about the device

configuration.

8.1

Number of phases selection

L6713A allows to select between two and three phase operation simply using the

PHASE_SEL pin, as shown in the following table.

8.2

DAC selection

L6713A embeds a selectable DAC (through SS/LTBG/AMD pin, See Table 12) that allows to

regulate the output voltage with a tolerance of ±0.5% (±0.6% for AMD DAC) recovering from

offsets and manufacturing variations. In case of selecting Intel mode, the device

automatically introduces a -19 mV (both VRD10.x and VR11) offset to the regulated voltage

in order to avoid any external offset circuitry to worsen the guaranteed accuracy and, as a

consequence, the calculated system TOB.

Note:

When selecting Intel mode, SS/LTBG/AMD pin is used to select both soft-start time and

LTB™ gain (see dedicated sections).

Table 11.

Number of phases setting

PHASE_SEL pin

Number of phases

Phases used

Floating

2-PHASE

Phase1, Phase3

Short to SGND

3-PHASE

Phase1, Phase2, Phase3

Table 12.

DAC settings (See note)

SS / LTBG / AMD

Resistor (RSSOSC)

vs. SGND

DAC

Soft-start time

LTB™ gain

OVP

UVP

0 (Short)

AMD

Not

programmable

Fixed

(LTB™ gain = 2)

1.800 V (typ)

Programmable

-750 mV

(typ)

> 2.4 k

Intel

Programmable

trough RSSOSC

Programmable

trough RSSOSC

(LTB™ gain

≤ 2)

VID + 175 mV

(typ)

programmable

-750 mV

(typ)

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