FAN5026MTCX ,Product informationGeneral Description• Highly flexible dual synchronous switching PWM The FAN5026 PWM controller provi ..
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FAN5026MTC-FAN5026MTCX
Product information
Features Highly flexible dual synchronous switching PWM
controller includes modes for: DDR mode with in-phase operation for reduced
channel interference 90° phase shifted two-stage DDR Mode for reduced
input ripple Dual Independent regulators 180° phase shifted Complete DDR Memory power solution VTT Tracks VDDQ/2 VDDQ/2 Buffered Reference Output Lossless current sensing on low-side MOSFET or
Precision current sensing using sense resistor VCC Under-voltage Lockout
•Wide power input range: 3 to 16V Excellent dynamic response with Voltage Feed-Forward
and Average Current Mode control
•Power-Good Signal Also supports DDR-II and HSTL TSSOP28 package
Applications DDR V
DDQ
and V
voltage generation Desktop Computer Graphics cards
General DescriptionThe FAN5026 PWM controller provides high efficiency and
regulation for two output voltages adjustable in the range
from 0.9V to 5.5V that are required to power I/O, chip-sets,
and memory banks in high-performance computers, set top
boxes, and VGA cards. Synchronous rectification contributes
to high efficiency over a wide range of loads. Efficiency is
even further enhanced by using MOSFET’s R
DS(ON)
as a
current sense component.
Feed-forward ramp modulation, average current mode
control scheme, and internal feedback compensation provide
fast response to load transients. Out-of-phase operation with
180 degree phase shift reduces input current ripple. The
controller can be transformed into a complete DDR memory
power supply solution by activating a designated pin. In
DDR mode of operation one of the channels tracks the
output voltage of another channel and provides output
current sink and source capability — features essential for
proper powering of DDR chips. The buffered reference
voltage required by this type of memory is also provided.
The FAN5026 monitors these outputs and generates separate
PGx (power good) signals when the soft-start is completed
and the output is within ±10% of its set point. A built-in
over-voltage protection prevents the output voltage from
going above 120% of the set point. Normal operation is
automatically restored when the over-voltage conditions go
away. Under-voltage protection latches the chip off when
either output drops below 75% of its set value after the
soft-start sequence for this output is completed. An adjust-
able over-current function monitors the output current by
sensing the voltage drop across the lower MOSFET.
If precision current-sensing is required, an external current-
sense resistor may optionally be used.
