L6713ATR datasheet(26/64 Pages) STMICROELECTRONICS

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Device description

L6713A

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Device description

L6713A is two/three phase PWM controller with embedded high current drivers providing

complete control logic and protections for a high performance step-down DC-DC voltage

regulator optimized for advanced microprocessor power supply.

Multi phase buck is the simplest and most cost-effective topology employable to satisfy the

increasing current demand of newer microprocessors and modern high current VRM

modules.

It allows distributing equally load and power between the phases using smaller, cheaper and

most common external power MOSFETs and inductors. Moreover, thanks to the equal

phase shift between each phase, the input and output capacitor count results in being

reduced. Phase interleaving causes in fact input RMS current and output ripple voltage

reduction and show an effective output switching frequency increase: the 200kHz free-

running frequency per phase, externally adjustable through a resistor, results multiplied on

the output by the number of phases.

L6713A is a dual-edge asynchronous PWM controller featuring load transient boost

LTB Technology™ (patent pending): the device turns on simultaneously all the phases as

soon as a load transient is detected allowing to minimize system cost by providing the

fastest response to load transition.

Load transition is detected (through LTB pin) measuring the derivate dV/dt of the output

voltage and the dV/dt can be easily programmed extending the system design flexibility.

Moreover, load transient boost LTB Technology™ gain can be easily modified in order to

keep under control the output voltage ring back.

LTB Technology™ can be disabled and in this condition the device works as a dual-edge

asynchronous PWM.

The controller allows to implement a scalable design: a three phase design can be easily

downgraded to two phase simply by leaving one phase not mounted and leaving

PHASE_SEL pin floating.

The same design can be used for more than one project saving development and debug

time. In the same manner, a two phase design can be further upgraded to three phase

facing with newer and highly-current-demanding applications.

L6713A permits easy system design by allowing current reading across inductor in fully

differential mode. Also a sense resistor in series to the inductor can be considered to

improve reading precision.

The current information read corrects the PWM output in order to equalize the average

current carried by each phase limiting the error to ±3 % over static and dynamic conditions

unless considering the sensing element spread.

The controller includes multiple DACs, selectable through an apposite pin, allowing

compatibility with both Intel VR10,VR11 and AMD 6BIT processors specifications, also

performing D-VID transitions accordingly.

Low-side-less start-up allows soft-start over pre-biased output avoiding dangerous current

return through the main inductors as well as negative spike at the load side.

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