L6711TR STMicroelectronics, L6711TR Datasheet - Page 47

• Manufacturer Part Number: L6711TR
• Description: IC CTRLR 3PHASE VID/DACS 48-TQFP
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L6711TR

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 0.8 ~ 1.55 V
• Current - Output: 2A
• Frequency - Switching: 150kHz
• Voltage - Input: 12V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-TQFP Exposed Pad, 48-eTQFP, 48-HTQFP, 48-VQFP
• Power - Output: 2.5W
• Output Voltage: 0.8 V to 1.581 V
• Output Current: 95 A
• Input Voltage: 13.8 V
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5363-2; L6711TR

L6711
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Embedding L6711-based VRDs...
When embedding the VRD into the application, additional care must be taken since the
whole VRD is a switching DC/DC regulator and the most common system in which it has to
work is a digital system such as MB or similar. In fact, latest MB has become faster and
powerful: high speed data bus are more and more common and switching-induced noise
produced by the VRD can affect data integrity if not following additional layout guidelines.
Few easy points must be considered mainly when routing traces in which switching high
currents flow (switching high currents cause voltage spikes across the stray inductance of
the traces causing noise that can affect the near traces):
Keep safe guarding distance between high current switching VRD traces and data buses,
especially if high-speed data bus to minimize noise coupling.
Keep safe guard distance or filter properly when routing bias traces for I/O sub-systems that
must walk near the VRD.
Possible causes of noise can be located in the PHASE connections, Mosfet gate drive and
Input voltage path (from input bulk capacitors and HS drain). Also PGND connections must
be considered if not insisting on a power ground plane. These connections must be carefully
kept far away from noise-sensitive data bus.
Since the generated noise is mainly due to the switching activity of the VRM, noise
emissions depend on how fast the current switch. To reduce noise emission levels, it is also
possible, in addition to the previous guidelines, to reduce the current slope and then to
increase the switching times: this will cause, as a consequence of the higher switching time,
an increase in switching losses that must be considered in the thermal design of the system.
Embedding L6711-based VRDs...
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