L6751 datasheet(12/59 Pages) STMICROELECTRONICS

12 / 59 page

Pin description and connection diagrams

L6751

12/59

Doc ID 023992 Rev 1

B17

GND

GND connection. All internal references and logic are referenced to this pin.

Filter to VCC5 with proper MLCC capacitor and connect to the PCB GND

plane.

A20

SMDATA

PMBus data.

B18

SMAL#

PMBus alert.

A21

SMCLK

PMBus clock.

B19

Not internally bonded.

A22

ADDR

Connect a resistor divider to GND/VCC5 in order to configure the IC operating

mode. See Table 9 and Table 6 for details.

B20

STM

Thermal monitor sensor.

Connect with proper network embedding NTC to the single-phase power

section. The IC senses the power section temperature and uses the

information to define the VR_HOT signal and temperature monitoring.

By programming proper STCOMP gain, the IC also implements load-line and

SIMON thermal compensation for the single-phase section when applicable.

Short to GND if not used. See Section 8 for details.

A23

STCOMP

Thermal monitor sensor gain.

Connect proper resistor divider between VCC5 and GND to define the gain to

apply to the signal sensed by ST to implement thermal compensation for the

single-phase section. Short to GND to disable temperature compensation.

See Section 8 for details.

B21

OSC

Oscillator pin.

It allows the programming of the switching frequency FSW for the multi-phase

section. The pin is internally set to 1.02 V, frequency for multi-phase is

programmed according to the resistor connected to GND or VCC with a gain

of 10 Hz/µA. Leaving the pin floating programs a switching frequency of 200

Hz per phase. Effective frequency observable on the load results as being

multiplied by the number of active phases N. See Section 10 for details.

A24

VIN

Input voltage monitor.

Connect to input voltage monitor point through a divider RVUP / RVDWN to

perform VIN sense through PMBus (RUP = 118.5 Ω; RDOWN = 10 kΩ typ.).

B22

Not internally bonded.

A25

Level sensitive enable pin (3.3 V compatible).

Pull low to disable the device, pull up above the turn-on threshold to enable

the controller.

Table 2.

Pin description (continued)

Pin#

Name

Type

Function

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