L6759D datasheet(11/51 Pages) STMICROELECTRONICS

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L6759D

Pin description and connection diagrams

Doc ID 023240 Rev 1

11/51

ILIM

Multi-phase section current limit.

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

this pin. Connect through a resistor RLIM to GND. When the pin voltage

reaches 2.5 V, the overcurrent protection is set and the IC latches. Filter

through CLIM to GND to delay OC intervention.

SRGND

Remote buffer ground sense.

Connect to the negative side of the single-phase load to perform remote

sense.

SFBR

Remote buffer positive sense.

Connect to the positive side of the single-phase load to perform remote

sense.

SVSEN

Remote buffer output.

Output voltage monitor, manages OV and UV protection.

Connect with a resistor RSFB // (RSI - CSI) to SFB.

SFB

Error amplifier inverting input.

Connect with a resistor RSFB // (RSI - CSI) to SVSEN and with an

(RSF - CSF)// CSH to SCOMP.

SCOMP

Error amplifier output.

Connect with an (RSF - CSF)// CSH to SFB. The device cannot be dis-

abled by pulling low this pin.

IMAX

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

See Table 6 and Section 6 for details.

SMDATA

PMBus data.

SMAL#

PMBus alert.

SMCLOCK

PMBus clock.

ADDR

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

address, to define the GDC and DPM thresholds and to control the

droop function on multi-phase. See Table 6 and Section 6 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, the 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. The effective frequency

observable on the load results 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 RUP / RDOWN to

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

typ.). See Section 12.3 for details.

Table 2.

Pin description (continued)

Pin#

Name

Function

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