IR3846M_15 Datasheet, PDF (1/54 Pages) International Rectifier – Enhanced line/load regulation with Feed-Forward

35A Highly Integrated SupIRBuck^®
Single-Input Voltage, Synchronous Buck Regulator
IR3846
FEATURES
• Single 5V to 21V application
• Wide Input Voltage Range from 1.5V to 21V with
external Vcc
• Output Voltage Range: 0.6V to 0.86*PVin
• 0.5% accurate Reference Voltage
• Enhanced line/load regulation with Feed-Forward
• Programmable Switching Frequency up to
1.5MHz
• Internal Digital Soft-Start
• Enable input with Voltage Monitoring Capability
• Remote Sense Amplifier with True Differential
Voltage Sensing
• Thermally compensated current limit and Hiccup
Mode Over Current Protection
• Smart LDO to enhance efficiency
• Vp for tracking applications and sequencing
• Vref is available externally to enable margining
• External synchronization with Smooth Clocking
• Dedicated output voltage sensing for power good
indication and overvoltage protection which
remains active even when Enable is low.
• Enhanced Pre-Bias Start up
• Body Braking to improve transient
• Integrated MOSFET drivers and Bootstrap diode
• Thermal Shut Down
• Post Package trimmed rising edge dead-time
• Programmable Power Good Output with tracking
• Small Size 5mm x 7mm PQFN
• Operating Junction Temp: -40^oC<Tj<125^oC
• Lead-free, Halogen-free and RoHS Compliant
DESCRIPTION
The IR3846 SupIRBuck^® is an easy-to-use, fully
integrated and highly efficient DC/DC regulator. The
onboard PWM controller and MOSFETs make IR3846
a space-efficient solution, providing accurate power
delivery for low output voltage and high current
applications.
IR3846 is a versatile regulator which offers
programmability of switching frequency and current
limit while operating in wide input and output voltage
range.
The switching frequency is programmable from 300
kHz to 1.5MHz for an optimum solution.
It also features important protection functions, such as
Over Voltage Protection (OVP), Pre-Bias startup,
hiccup current limit and thermal shutdown to give
required system level security in the event of fault
conditions.
APPLICATIONS
• Netcom Applications
• Embedded Telecom Systems
• Server Application
• Distributed Point of Load Power Architectures
• Storage Applications
ORDERING INFORMATION
Base Part
Number
Package Type
IR3846
PQFN 5mm x 7mm
IR3846
Standard Pack
Form
Quantity
Tape and Reel
4000
Orderable Part
Number
IR3846MTRPBF
PBF Lead Free
TR
Tape and Reel
M
Package Type
1 www.irf.com © 2015 International Rectifier
Submit Datasheet Feedback June 18, 2015