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reference designIR3847M

Infineon Technologies IR3847M

25A Highly Integrated Single-Input Voltage, Synchronous Buck Regulator in a PQFN package.

Overview

TopologyBuck Converter
Input voltage5 V
Switching frequency270-1650 kHz
Output 13.3 V / 25 A

Description

The IR3847 SupIRBuck® is an easy-to-use, fully integrated and highly efficient DC/DC regulator. The onboard PWM controller and MOSFETs make IR3847 a space-efficient solution, providing accurate power delivery for low output voltage and high current applications.

IR3847 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 faultconditions.

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 whichremains 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 6mm PQFN
  • Operating Junction Temp: -40oC<Tj<125oC
  • Lead-free, Halogen-free and RoHS Compliant

Remarks:List of inductorsRefer page no.10,11,12.

Typical applications

  • Embedded Telecom Systems
  • Server Application
  • Distributed Point of Load Power Archit
  • Storage Applications
  • Netcom Applicatio

More information

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
L(µH)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC max.(mΩ)
Material
LR(µH)
fres(MHz)
SamplesAvailability & Sample
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7443320068
SPECWE-HCC SMT High Current Cube Inductor, 0.68 µH, 40.2 A
Simu­lation
Availability
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCC SMT High Current Cube Inductor
Inductance0.68 µH
Performance Rated Current40.2 A
Saturation Current @ 10%35.8 A
Saturation Current @ 30%39.1 A
DC Resistance1.85 mΩ
MaterialFerrite 
Rated Inductance0.66 µH
Self Resonant Frequency108 MHz
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