IR3853M_15 Datasheet, PDF (1/35 Pages) International Rectifier – HIGHLY EFFICIENT INTEGRATED 4A, SYNCHRONOUS BUCK REGULATOR

PD-97516
IR3853MPbF
SupIRBuck^TM
HIGHLY EFFICIENT
INTEGRATED 4A, SYNCHRONOUS BUCK REGULATOR
Features
• Greater than 95% Maximum Efficiency
• Wide Input Voltage Range 1.5V to 21V
• Wide Output Voltage Range 0.7V to 0.9*Vin
• Continuous 4A Load Capability
• Integrated Bootstrap-diode
• High Bandwidth E/A for excellent transient
performance
• Programmable Switching Frequency up to 1.5MHz
• Programmable Over Current Protection
• Over Voltage Protection
• Dedicated input for output voltage monitoring
• Programmable 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
• External Synchronization
• -40^oC to 125^oC operating junction temperature
• Thermal Protection
• 4mm x 5mm Power QFN Package
• Halogen Free, Lead Free and RoHS compliant
Description
The IR3853 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
IR3853 a space-efficient solution, providing
accurate power delivery for low output voltage
applications.
IR3853 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 1.5MHz for an optimum solution.
It also features important protection functions,
such as Pre-Bias startup, hiccup current limit,
over-voltage, 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
Fig. 1. Typical application diagram
1
Rev 4.0