L6706 datasheet(16/47 Pages) STMICROELECTRONICS

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Device description

L6706

16/47

Doc ID 15698 Rev 2

Device description

L6706 is single 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.

L6706 is a dual-edge asynchronous PWM controller featuring load transient boost LTB

Technology™: the device turns on the phase 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.

L6706 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 controller allows compatibility with both Intel VR11.0 and VR11.1 processors

specifications, also performing D-VID transitions accordingly.

The device is VR11.1 compatible implementing IMON signal.

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

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

L6706 provides a programmable over-voltage protection to protect the load from dangerous

over stress, latching immediately by turning ON the lower driver and driving high the

OSC/FAULT pin. Furthermore, preliminary OVP protection also allows the device to protect

load from dangerous OVP when VCC is not above the UVLO threshold or OUTEN is low.

The overcurrent protection is externally adjustable through a single resistor. The device

keeps constant the peak of the inductor current ripple working in constant current mode until

the latched UVP.

A compact 6 x 6 mm body VFQFPN-40 package with exposed thermal pad allows

dissipating the power to drive the external MOSFET through the system board.

L6706 датащи(PDF) 16 Page - STMicroelectronics