DCDC Converter 25A Highly Integrated SupIRBuck Single-Input Voltage, Synchronous SupIRBuck Buck Regulator IR3847 DESCRIPTION FEATURES Single 5V to 21V application The IR3847 SupIRBuck is an easy-to-use, fully integrated and highly efficient DC/DC regulator. The Wide Input Voltage Range from 1.5V to 21V with external Vcc onboard PWM controller and MOSFETs make IR3847 a space-efficient solution, providing accurate power Output Voltage Range: 0.6V to 0.86*PVin delivery for low output voltage and high current 0.5% accurate Reference Voltage applications. Enhanced line/load regulation with Feed-Forward Programmable Switching Frequency up to IR3847 is a versatile regulator which offers 1.5MHz programmability of switching frequency and current Internal Digital Soft-Start limit while operating in wide input and output voltage Enable input with Voltage Monitoring Capability range. Remote Sense Amplifier with True Differential Voltage Sensing The switching frequency is programmable from 300 kHz to 1.5MHz for an optimum solution. Thermally compensated current limit and Hiccup Mode Over Current Protection It also features important protection functions, such as Smart LDO to enhance efficiency Over Voltage Protection (OVP), Pre-Bias startup, Vp for tracking applications and sequencing hiccup current limit and thermal shutdown to give Vref is available externally to enable margining required system level security in the event of fault External synchronization with Smooth Clocking conditions. Dedicated output voltage sensing for power good indication and overvoltage protection which remains active even when Enable is low. APPLICATIONS Enhanced Pre-Bias Start up Body Braking to improve transient Netcom Applications Integrated MOSFET drivers and Bootstrap diode Embedded Telecom Systems Thermal Shut Down Server Application Post Package trimmed rising edge dead-time Distributed Point of Load Power Architectures Programmable Power Good Output with tracking Storage Applications Small Size 5mm x 6mm PQFN o o Operating Junction Temp: -40 C<Tj<125 C Lead-free, Halogen-free and RoHS Compliant ORDERING INFORMATION Base Part Standard Pack Orderable Part Package Type Form Quantity Number Number IR3847 PQFN 5mm x 6mm Tape and Reel 4000 IR3847MTRPBF IR3847 PBF Lead Free TR Tape and Reel M Package Type 1 Rev 3.7 May 17, 2016 IR3847 BASIC APPLICATION 5.0V<Vin<21V PVin Vp Vin Boot Vo Vcc/ SW LDO out OCSet Vsns PGood RS+ PGood RS- Rt/SYNC RSo Fb Enable Comp Vref Gnd PGnd Figure 1: IR3847 Basic Application Circuit Figure 2: Efficiency Vin=12V, Fsw=600kHz PIN DIAGRAM 5mm X 6mm POWER QFN Top View PGnd SW 26 25 24 SW 23 SW 32 22 SW PVin 1 SW 21 SW 20 SW 27 33 PGnd NC 31 19 NC NC NC NC 30 28 Boot 2 18 VCC/LDO out 29 Enable 3 17 Vin PGnd Rt/Sync 4 16 PGD OCset 5 15 Vp 6 7 8 9 10 11 12 13 14 2 Rev 3.7 May 17, 2016 Vsns FB Comp RSo PGnd LGnd RS- RS+ Vref