L6758A datasheet(20/42 Pages) STMICROELECTRONICS

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Device description and operation

L6758A

20/42

DocID023298 Rev 2

Device description and operation

The L6758A is a programmable two-to-four phase PWM controller that provides complete

control logic and protection to implement a high performance step-down DC-DC voltage

regulator optimized for advanced microprocessor power supply. The device features 2nd

generation LTB Technology: through a load transient detector, it is able to simultaneously

turn on all the phases. This allows the output voltage deviation to be minimized and, in turn,

the system cost to be minimized by providing the fastest response to a load transition.

The L6758A implements current reading across the inductor in fully-differential mode. A

sense resistor in series to the inductor can be also considered in order to improve reading

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

average current carried by each phase.

The controller supports VR12 specifications featuring 25 MHz SVI bus and all the required

registers. The platform may program the defaults for these registers through dedicated

pinstrapping.

A complete set of protection is available: overvoltage, undervoltage, overcurrent (per-phase

and total) and feedback disconnection guarantee the load to be safe under all conditions.

Special power management features like DPM, VFDE and GDC modify phase number, gate

driving voltage and switching frequency to optimize the efficiency over the load range.

The L6758A is available in VFQFPN48 with 6x6 mm body package.

Figure 4. Device initialization

AM11137v1

SVI Packet

VCC5

VCC12

UVLO

2mSec POR

UVLO

50uSec

EN_VTT

SVI BUS

V_SinglePhase

ENVTT

SVRRDY

V_MultiPhase

VRRDY

64uSec

SVI Packet

Command ACK but not executed

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