L6718 datasheet(16/71 Pages) STMICROELECTRONICS

16 / 71 page

Pin description and connection diagrams

L6718

16/71

DocID023399 Rev 3

SCSP

Single-phase rail current sense positive input.

Connect through an R-C filter to the phase-side of single-phase rail

inductor.

See Section 14 for proper layout of this connection.

SCSN

Single-phase rail current sense negative input.

Connect through an RG resistor to the output-side of single-phase rail

inductor.

Filter the output-side of RG with 100 nF (typ.) to GND.

See Section 14 for proper layout of this connection.

STM

Thermal monitor sensor.

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

section. The IC senses the hot spot temperature and uses the information

to define the VRHOT signal and temperature zone register.

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

thermal compensation for the single-phase section.

Short to GND if not used. See Section 10 for details.

CONFIG0

/PSI0

Connect a resistor divider to GND and VCC5 to define power

management characteristics. See Section 6.6 for details.

At the end of the soft-start, this pin is internally pulled up or pulled down to

indicate the power status. See Table 17 for details.

SBOOT

Single-phase rail high-side driver supply.

Connect through a capacitor (220 nF typ.) and a resistor (2.2 Ohm) to

SPHASE and provide a Schottky bootstrap diode. A small resistor in

series to the boot diode helps to reduce boot capacitor overcharge.

SHGATE

Single-phase rail high-side driver output.

It must be connected to the HS MOSFET gate. A small series resistor

helps to reduce the device-dissipated power and the negative phase

spike.

SPHASE

Single-phase rail high-side driver return path.

It must be connected to the HS MOSFET source and provides return path

for the HS driver.

SLGATE

Single-phase rail low-side driver output.

It must be connected to the low-side MOSFET gate. A small series

resistor helps to reduce device-dissipated power.

PWM4

/ PH#

Fourth phase PWM output of the multi-phase rail and phase number

selection pin.

Internally pulled up to 3.3 V, connect to external driver PWM4 when

channel 4 is used. The device is able to manage the HiZ by setting the pin

floating.

Short to GND or leave floating to 3/2 phase operation, seeTable 7 for

details.

Table 2. Pin description (continued)

Pin#

Name

Function

L6718 Datasheet(PDF) 16 Page - STMicroelectronics

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