PD-97660
IR3831WMPbF
TM
SupIRBuck
HIGHLY EFFICIENT INTEGRATED
SYNCHRONOUS BUCK REGULATOR FOR DDR APPLICATIONS
Features
Description
The IR3831W SupIRBuckTM is an easy-to-use,
fully integrated and highly efficient DC/DC
regulator. The MOSFETS co-packaged with the
on-chip PWM controller make IR3831W a space-
efficient solution, providing accurate power
delivery for DDR memory applications.
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Wide Input Voltage Range 1.0V to 16V
Wide Output Voltage Range 0.6V to 0.9*Vin
Continuous 8A Load Capability
Integrated Bootstrap-diode
High Bandwidth E/A for excellent transient
performance
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Programmable Switching Frequency up to 1.5 MHz
Programmable Over Current Protection
PGood output
IR3831W is configured to generate termination
voltage (VTT) for DDR memory applications.
Hiccup Current Limit
IR3831W offers programmability of start up time,
switching frequency and current limit while
operating in wide input and output voltage range.
Programmable Soft-Start
Enable Input with Voltage Monitoring Capability
Enhanced Pre-Bias Start-up
The switching frequency is programmable from
250kHz to 1.5MHz for an optimum solution.
Vp input for DDR Tracking applications
-40oC to 125oC operating junction temperature
Thermal Protection
It also features important protection functions,
such as Pre-Bias startup, hiccup current limit and
thermal shutdown to give required system level
security in the event of fault conditions.
5mm x 6mm Power QFN Package, 0.9 mm height
Lead-free, halogen-free and RoHS compliant
Applications
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Server Applications
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Distributed Point of Load Power Architectures
Netcom Applications
Storage Applications
Embedded Telecom Systems
1.0V <Vin<16V
4.5V <Vcc<5.5V
Enable
Vin
Boot
SW
Vo
Vcc
VDDQ
PGood
PGood
OCSet
Fb
Vp
Rt
Comp
PGnd
SS/ SD
Gnd
Fig. 1. Typical application diagram
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Rev 16.0