L6756D datasheet(10/36 Pages) STMICROELECTRONICS

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Pins description and connection diagrams

L6756D

10/36

CS4

Channel 4 current sense positive input. Connect through an R-C filter to the

phase-side of the channel 4 inductor. When working at 2 or 3 phase, short to

the regulated voltage.

DRVON

External driver enable. CMOS output used to control the external driver status:

pulled-low to manage HiZ conditions or pulled-high for normal driver switching.

30 to

G1 to G4

PWM outputs. Connect to external drivers PWM inputs. The device is able to

manage HiZ status by setting the pins floating.

By shorting to GND G4 or G2 and G4, it is possible to program the device to

work at 3 or 2 phase respectively.

VREF

This pin provide a 2.5 V reference. Filter with 1 nF (max) to SGND.

GND

All the internal references are referred to this pin. Connect to the PCB signal

ground.

VCC

Device power supply.

Operative voltage is 12 V ±15 %. Filter with at least 1

μF MLCC vs. ground.

VR_RDY

Open drain output set free after SS has finished and pulled low when triggering

any protection. Pull up to a voltage lower than 3.3 V (typ), if not used it can be

left floating.

LTB_GAIN

Load transient boost technology

® gain pin. See Section 9.2 for details.

PSI_A

PSI action configuration pin.

This pins configures the functionality of the PSI# / VR10 pin according to

Table 9 as follow:

VR10: Short to SGND to configure the VID_SEL functionality. The controller

will not manage low power-states but will be backward compatible with VR10 /

VR11 platforms.

PSI#: The device will work in VR11 mode and perform low power-states

management through the PSI# pin. See Section 7 for details.

IMON

Current monitor output. A current proportional to the read current is sourced

from this pin. Connect through a resistor RMON to FBG to implement a load

indicator. Connect the load indicator directly to VR11.1 CPUs.The pin voltage

is clamped to 1.1V max to preserve the CPU from excessive voltages.

Thermal pad

Thermal pad connects the silicon substrate and makes good thermal contact

with the PCB. Connect to the PGND plane.

Table 2.

Pin description (continued)

Pin#

Name

Function

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