L6717 datasheet(32/56 Pages) STMICROELECTRONICS

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Power manager I2C

L6717

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Doc ID 17326 Rev 1

6.2

Dynamic phase management (DPM)

Dynamic phase management allows to adjust the number of working phases according to

the delivered current still maintaining the benefits of the multiphase regulation.

Phase number is reduced by monitoring the voltage level across ILIM pin: L6717 reduces

the number of working phase according to the strategy defined by the PSI_A flag when the

voltage across ILIM pin is lower than VDPM. When the load current increases the phase

number is restored to the original value as soon as the voltage across ILIM pin exceeds

VDPM.

VDPM is selected through the DPMTH command. See Section 6.1.

The current at which the transition happens (IDPM) can be estimated as:

VDPM thresholds are defined as a percentage of the voltage on ILIM pin corresponding to

the Thermal Design Current of the application.

1.8V on ILIM pin corresponds to 100% of the load and DPM threshold are defined as a

percentage of 1.8V (see Table 18 for details).

An hysteresis is provided for each threshold in order to avoid multiple DPM actions

triggering in steady load conditions.

DPM is disabled by default: Soft-start is performed with all the available phases.

Table 17.

Power management flags

Data stream bit

Flag

Description

[1:3]

n/a

Ignored.

[4:5]

DPMTH

DPM threshold. Allow to define 4 different values for VDPM.

See Section 6.2 for code/thresholds correspondence.

[6]

PSI_A

0b (default): IC working in single phase when PSI_L asserted.

1b:IC working in two phase when PSI_L asserted.

[7]

PSI_EN

0b: PSI_L flag in SVI ignored.

1b (default): PSI_L flag in SVI monitored and phase dropping

enabled according to PSI_A.

[8]

DPM_ON

0b (default): DPM disabled.

1b: DPM enabled.

Table 18.

VDPM thresholds

CODE

VDPM (ILIM rising)

VDPM (ILIM falling)

00 (default)

20%

15%

25%

20%

30%

25%

35%

30%

DPM

ILIM

---------------

DCR

-------------

⋅

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