L6751B datasheet(12/58 Pages) STMICROELECTRONICS

12 / 58 page

Pin description and connection diagram

L6751B

12/58

Doc ID 024028 Rev 1

IMAX /

SIMAX

Connect a resistor divider to GND/VCC5 in order to define the IMAX and

SIMAX registers. See Table 8 and Table 6 for details.

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.

SMDATA

PMBus data

SMAL#

PMBus alert

SMCLK

PMBus clock

Not internally bonded

ADDR

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

ating mode. See Table 9 and Table 6 for details.

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 infor-

mation 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.

STCOMP

Thermal monitor sensor gain.

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

to apply to the signal sensed by STM to implement thermal compensation

for the single-phase section. Short to GND to disable temperature com-

pensation. See Section 8 for details.

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 kHz/µA. Leaving the pin floating programs a switching frequency

of 200 kHz per phase. Effective frequency observable on the load results

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

details.

VIN

Input voltage monitor.

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

perform VIN sense through PMBus (RUP = 118.5 kΩ; RDOWN = 10 kΩ

typ.).

n/a

Not internally bonded

Table 2.

Pin description (continued)

Pin#

Name

Type

Function

L6751B Datasheet(PDF) 12 Page - STMicroelectronics

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