PD-97507
IR3843WMPbF
TM
HIGHLY EFFICIENT
SupIRBuck
INTEGRATED 2A SYNCHRONOUS BUCK REGULATOR
Features
Description
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Wide Input Voltage Range 1.5V to 16V
Wide Output Voltage Range 0.7V to 0.9*Vin
Continuous 2A Load Capability
The IR3843W SupIRBuckTM is an easy-to-use,
fully integrated and highly efficient DC/DC
synchronous Buck regulator. The MOSFETs co-
packaged with the on-chip PWM controller make
IR3843W a space-efficient solution, providing
accurate power delivery for low output voltage
applications.
Integrated Bootstrap-diode
High Bandwidth E/A for excellent transient
performance
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Programmable Switching Frequency up to 1.5MHz
Programmable Over Current Protection
PGood output
IR3843W is a versatile regulator which offers
programmability of start up time, switching
frequency and current limit while operating in
wide input and output voltage range.
Hiccup Current Limit
Precision Reference Voltage (0.7V, +/-1%)
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.
Seq input for 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.
Multiple current ratings in pin compatible footprint
5mm x 6mm Power QFN Package, 0.9 mm height
Lead-free, halogen-free and RoHS compliant
Applications
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Netcom Applications
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Server Applications
Computing Peripheral Voltage Regulators
General DC-DC Converters
Storage Applications
Embedded Telecom Systems
Distributed Point of Load Power Architectures
1.5V <Vin<16V
4.5V <Vcc<5.5V
Enable
Seq
Vin
Boot
Vo
Vcc
SW
PGood
PGood
OCSet
Fb
Rt
Comp
PGnd
SS/ SD
Gnd
Fig. 1. Typical application diagram
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Rev 13.0