IR3843AM_15 Datasheet, PDF (1/33 Pages) International Rectifier – HIGHLY EFFICIENT INTEGRATED 3A SYNCHRONOUS BUCK REGULATOR

PD-97509
IR3843AMPbF
SupIRBuck^TM
HIGHLY EFFICIENT
INTEGRATED 3A SYNCHRONOUS BUCK REGULATOR
Features
• Wide Input Voltage Range 1.5V to 21V
• Wide Output Voltage Range 0.7V to 0.9*Vin
• Continuous 3A Load Capability
• Integrated Bootstrap-diode
• High Bandwidth E/A for excellent transient
performance
• Programmable Switching Frequency up to 1.2MHz
• Programmable Over Current Protection
• PGood output
• Hiccup Current Limit
• Precision Reference Voltage (0.7V, +/-1%)
• Programmable Soft-Start
• Enable Input with Voltage Monitoring Capability
• Enhanced Pre-Bias Start-up
• Seq input for Tracking applications
• -40^oC to 125^oC operating junction temperature
• Thermal Protection
• Multiple current ratings in pin compatible footprint
• 5mm x 6mm Power QFN Package, 0.9 mm height
• Lead-free, halogen-free and RoHS compliant
Description
The IR3843A SupIRBuck^TM 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
IR3843A a space-efficient solution, providing
accurate power delivery for low output voltage
applications.
IR3843A 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.
The switching frequency is programmable from
250kHz to 1.2MHz for an optimum solution.
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.
Applications
• Server Applications
• Storage Applications
• Embedded Telecom Systems
• Distributed Point of Load Power Architectures
• Netcom Applications
• Computing Peripheral Voltage Regulators
• General DC-DC Converters
1.5V <Vin<16V
4.5V <Vcc<5.5V
Seq
Enable
Vin _Boot
Vcc
Vo
SW
PGood
PGood
OCSet
Fb
Rt
SS/ SD Gnd
Comp
PGnd
Fig. 1. Typical application diagram
1
Rev 16.0