L6756D datasheet(9/36 Pages) STMICROELECTRONICS

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L6756D

Pins description and connection diagrams

9/36

ROSC

Oscillator pin. It allows programming the switching frequency FSW of each

channel: the equivalent switching frequency at the load side results in being

multiplied by the phase number N.

Frequency is programmed according to the resistor connected from the pin to

GND or VCC with a gain of 10 kHz/µA. Leaving the pin floating programs a

switching frequency of 200 kHz per phase.

ILIM

Over current SET pin. Connect to GND through a RILIM resistor to set the OC

threshold. this pin sources a copy of the DROOP current; OC is set when the

voltage at the pin crosses 1.7 V (typ). See Section 6.4 for details.

GND

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

Ground.

LTB

Load transient boost Technology

® input pin. See Section 9.2 for details.

FBG

Remote ground sense. Connect to the negative side of the load to perform

remote sense.

VSEN

Output voltage monitor, manages OVP and UVP protections. Connect to the

positive side of the load to perform remote sense.

A fixed 50

μA current is sunk through this pin to implement small positive offset

for the regulated voltage. See Section 5.4 for details.

COMP

Error Amplifier Output.

Connect with an RF - CF // CH to VFB. The device cannot be disabled by pulling

low this pin.

VFB

error amplifier inverting input.

Connect with a resistor RFB to VSEN and with an RF - CF // CH to COMP.

VDRP

A current proportional to the total current read is sourced from this pin

according to the current reading gain.

Short to VFB to implement voltage positioning or connect to GND through a

resistor and filter with 1 nF capacitor to implement an additional load indicator.

CS1N

Channel 1 current sense negative input. Connect through a Rg resistor to the

output-side of the channel inductor.

CS1

Channel 1 current sense positive input. Connect through an R-C filter to the

phase-side of the channel 1 inductor.

CS2N

Channel 2 current sense negative input. Connect through a Rg resistor to the

output-side of the channel inductor. When working at 2 phase, still connect

through Rg to CS2 and then to the regulated voltage.

CS2

Channel 2 current sense positive input. Connect through an R-C filter to the

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

regulated voltage.

CS3N

Channel 3 current sense negative input. Connect through a Rg resistor to the

output-side of the channel inductor.

CS3

Channel 3 current sense positive input. Connect through an R-C filter to the

phase-side of the channel 3 inductor.

CS4N

Channel 4 current sense negative input. Connect through a Rg resistor to the

output-side of the channel inductor. When working at 2 or 3 phase, still connect

through Rg to CS3 and then to the regulated voltage.

Table 2.

Pin description (continued)

Pin#

Name

Function

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