EC7401QI Datasheet, PDF (1/44 Pages) Altera Corporation – 4-Phase PWM Controller with 8-Bit DAC Code

Enpirion^® Power Datasheet
EC7401QI 4-Phase PWM Controller
with 8-Bit DAC Code
DS-1045
Datasheet
The Altera® Enpirion® EC7401QI controls microprocessor
core voltage regulation by driving up to 4 synchronous-rectified
buck channels in parallel. The EC7401QI can precision
R_DS(ON) or DCR Differential Current Sensing. Multiphase
buck converter architecture uses interleaved timing to multiply
channel ripple frequency and reduce input and output ripple
currents. Lower ripple results in fewer components, lower
component cost, reduced power dissipation, and smaller
implementation area.
Microprocessor loads can generate load transients with
extremely fast edge rates. The EC7401QI features a high
bandwidth control loop and ripple frequencies up to >4MHz to
provide optimal response to the transients.
Today’s microprocessors require a tightly regulated output
voltage position versus load current (droop). The EC7401QI
senses current by utilizing patented techniques to measure the
voltage across the on resistance, R_DS(ON), of the lower
MOSFETs or DCR of the output inductor during the lower
MOSFET conduction intervals. Current sensing provides the
needed signals for precision droop, channel-current balancing,
and overcurrent protection. A programmable internal
temperature compensation function is implemented to
effectively compensate for the temperature coefficient of the
current sense element.
A unity gain, differential amplifier is provided for remote
voltage sensing. Any potential difference between remote and
local grounds can be completely eliminated using the remote-
sense amplifier. Eliminating ground differences improves
regulation and protection accuracy. The threshold-sensitive
enable input is available to accurately coordinate the start up of
the EC7401QI with any other voltage rail. VID Voltage Scaling
technology allows seamless on-the-fly VID changes. The offset
pin allows accurate voltage offset settings that are independent
of VID setting.
Features
• Precision Multiphase Core Voltage Regulation
- Differential Remote Voltage Sensing
- 0.5% System Accuracy Over Life, Load, Line and
Temperature
- Adjustable Precision Reference-Voltage Offset
• Precision R_DS(ON) or DCR Current Sensing
- Accurate Load-Line Programming
- Accurate Channel-Current Balancing
- Differential Current Sense
• Microprocessor Voltage Identification Input
- VID Voltage Scaling Technology
- 8-Bit VID Input with Selectable VR11 Code and
Extended VR10 Code at 6.25mV per Bit
- 0.5V to 1.6V Operation Range
• Thermal Sensing
• Integrated Programmable Temperature Compensation
• Threshold-Sensitive Enable Function for Power Sequencing
and VTT Enable
• Overcurrent Protection
• Overvoltage Protection
• 2-, 3- or 4-Phase Operation
• Adjustable Switching Frequency Up to 1MHz Per Phase
• Package Option
- QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad
Flat No Leads - Product Outline
- QFN Near Chip Scale Package Footprint; Improves PCB
Efficiency, Thinner in Profile
• Pb-Free (RoHS Compliant)
101 Innovation Drive
San Jose, CA 95134
www.altera.com
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ISO
9001:2008
Registered
March 2014 Altera Corporation
09614
March 14, 2014
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