L6714 STMicroelectronics, L6714 Datasheet - Page 27

• Manufacturer Part Number: L6714
• Description: IC CTRLR 4PH W/DRIVERS 64-TQFP
• Manufacturer: STMicroelectronics

Specifications of L6714

• Applications: Controller, Intel VR10, VR11, AMD CPU
• Voltage - Input: 12V
• Number Of Outputs: 4
• Voltage - Output: 0.3 ~ 1.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 64-TQFP Exposed Pad, 64-eTQFP, 64-HTQFP, 64-VQFP
• Mounting Style: SMD/SMT
• Case: QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L6714
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Device description
L6714 is four-phase PWM controller with embedded high current drivers that provides
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 MOSFET 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 150kHz free-running frequency per
phase, externally adjustable through a resistor, results multiplied on the output by the
number of phases.
L6714 permits easy and flexible system design by allowing current reading across either
inductor or low side MOSFET in fully differential mode simply selecting the desired way
through apposite pin. In both cases, also a sense resistor in series to the related element
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
at ±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.
L6714 provides programmable Over-Voltage protection to protect the load from dangerous
over stress. It can be externally set to a fixed voltage through an apposite resistor, or it can
be set internally, latching immediately by turning ON the lower driver and driving high the
FAULT pin. Furthermore, preliminary OVP protection also allows the device to protect load
from dangerous OVP when VCC is not above the UVLO threshold.
The Over-Current protection provided, with an OC threshold for each phase, causes the
device to enter in constant current mode until the latched UVP.
L6714 provides system Thermal Monitoring: through an apposite pin the device senses the
temperature of the hottest component in the application driving the Warning and the Alarm
signal as a consequence.
A compact 10x10mm body TQFP64 package with exposed thermal pad allows dissipating
the power to drive the external MOSFET through the system board.
Device description
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