L6706 datasheet(7/47 Pages) STMICROELECTRONICS

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L6706

Pins description and connection diagrams

Doc ID 15698 Rev 2

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8LTB

Load transient boost pin.

Internally fixed at 2 V, connecting a RLTB - CLTB vs. VOUT allows to enable the

load transient boost technology™: as soon as the device detects a transient

load it turns on the PHASE. Short to SGND to disable the function.See “Load

transient boost technology” Section for details.

9IMON

Current monitor output pin.

A current proportional to the load current is sourced from this pin. Connect

through a resistor RMON to SGND (or FBG) to implement a load indicator. The

pin voltage is clamped to 1.1 V max.

LTBGAIN

Load transient boost technology™ gain pin.

Internally fixed at 1.24 V, connecting a RLTBGAIN resistor vs SGND allows

setting the GAIN of the LTB action. See See “Load transient boost technology”

Section for details.

OFFSET

Offset programming pin.

Internally fixed at 1.240 V, connecting a ROFFSET resistor vs. SGND allows

setting a current that is mirrored into FB pin in order to program a positive offset

according to the selected RFB. Short to SGND to disable the function.

See “Offset (optional)” Section for details.

OVPSEL

Over voltage programming pin.

Internally pulled up by 20 µA (min) to 3.3 V. Leave floating to use built-in

protection thresholds (OVPTH= VID + 175 mV typ). Connect to SGND through a

ROVP resistor and filter with 100 pF (max) to set the OVP threshold to a fixed

voltage according to the ROVP resistor.See “Over voltage and programmable

OVP” Section for details.

OCSET

Over current setting, psi action pin.

Connect to SGND through a ROCSET resistor to set the OCP threshold. See

“Overcurrent protection” Section for details.

OSC/

FAULT

Oscillator, fault pin.

It allows programming the switching frequency FSW. Frequency is programmed

according to the resistor connected from the pin vs. SGND or VCC with a gain

of 9.1 kHz/µA (see relevant section for details). Leaving the pin floating

programs a switching frequency of 200 kHz. The pin is forced high (3.3 V typ) to

signal an OVP/UVP fault: to recover from this condition, cycle VCC or the

OUTEN pin. See “Oscillator” Section for details.

SSOSC/

FLIMIT

Soft-start oscillator pin.

By connecting a resistor RSS to GND, it allows programming the soft-start time.

Soft-start time TSS will proportionally change with a gain of 25 [µs / kΩ]. The

same slope implemented to reach VBOOT has to be considered also when the

reference moves from VBOOT to the programmed VID code. The pin is kept to a

fixed 1.240 V. See “Soft-start” Section for details. It also allows to select

maximum LTB frequency. See “Load transient boost technology” Sectionfor

details.

Table 2.

Pin description (continued)

N°

Name

Description

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