L6751C datasheet(13/57 Pages) STMICROELECTRONICS

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L6751C

Pin description and connection diagrams

B24

SVDATA

SVD

Serial data.

A27

BOOT /

TMAX

Connect a resistor divider to GND/VCC5 in order to define BOOT and TMAX

registers. See Table 10 on page 23 for details.

VCC5

Main IC power supply.

Operative voltage is 5 V ± 5%. Filter with 1

F MLCC to GND (typ.).

A28

GDC

Gate drive control pin.

Used for efficiency optimization, see Section 9 on page 41 for details. If not

used, it can be left floating. Always filter with 1

F MLCC to GND.

B25

Not internally bonded.

A29

VDRV

Driving voltage for external drivers.

Connect to the selected voltage rail to drive external MOSFET when in

maximum power conditions. IC switches GDC voltage between VDRV and

VCC5 to implement efficiency optimization according to selected strategies.

B26

Not internally bonded.

A30

COMP /

ADDR

Error amplifier output.

Connect with an (RF - CF)// CP to FB. The device cannot be disabled by pulling

low this pin.

Connect RCOMP = 12.5 k to GND to extend PMBus addressing range (see

Table 9 on page 22).

B27

Error amplifier inverting input.

Connect with a resistor RFB // (RI - CI) to VSEN and with an (RF - CF)// CP to

COMP.

A31

VSEN

Output voltage monitor, manages OV and UV protection.

Connect to the positive side of the load to perform remote sense.

B28

FBR

Remote buffer positive sense.

Connect to the positive side of the multi-phase load to perform remote sense.

A32

LTB

LTB Technology input pin. See Section 11.2 on page 47 for details.

B29

RGND

Remote ground sense.

Connect to the negative side of the multi-phase load to perform remote sense.

A33

REF

The reference used for the multi-phase section regulation is available on this

pin with -125 mV offset. Connect through an RREF - CREF to GND to optimize

DVID transitions. Connect through ROS resistor to FB pin to implement small

positive offset to the regulation.

B30

IMON

Current monitor output.

A current proportional to the multi-phase load current is sourced from this pin.

Connect through a resistor RMON to GND. The information available on this

pin is used for the current reporting and DPM. The pin can be filtered through

CIMON to GND.

Table 2. Pin description (continued)

Pin no.

Name

Type

Function

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