DCDC Converter 16A Highly Integrated SupIRBuck Single-Input Voltage, Synchronous SupIRBuck Buck Regulator IR3448 FEATURES DESCRIPTION Single 5V to 21V application The IR3448 SupIRBuck is an easy-to-use, fully Wide Input Voltage Range from 1.5V to 21V with integrated and highly efficient DC/DC regulator. The external Vcc onboard PWM controller and MOSFETs make IR3448 Output Voltage Range: 0.6V to 0.86*PVin a space-efficient solution, providing accurate power 0.5% accurate Reference Voltage delivery for low output voltage and high current Enhanced line/load regulation with Feed-Forward applications. Programmable Switching Frequency up to 1.5MHz Internal Digital Soft-Start IR3448 is a versatile regulator which offers Enable input with Voltage Monitoring Capability programmability of switching frequency and current Remote Sense Amplifier with True Differential limit while operating in wide input and output voltage Voltage Sensing range. Thermally compensated current limit and Hiccup Mode Over Current Protection The switching frequency is programmable from 300 Smart LDO to enhance efficiency kHz to 1.5MHz for an optimum solution. External synchronization with Smooth Clocking Dedicated output voltage sensing for power good It also features important protection functions, such as indication and overvoltage protection which Over Voltage Protection (OVP), Pre-Bias startup, remains active even when Enable is low. hiccup current limit and thermal shutdown to give Enhanced Pre-Bias Start up required system level security in the event of fault Body Braking to improve transient conditions. Integrated MOSFET drivers and Bootstrap diode Thermal Shut Down Post Package trimmed rising edge dead-time Programmable Power Good Output APPLICATIONS Small Size 5mm x 6mm PQFN o o Server Application Operating Junction Temp: -40 C<Tj<125 C Distributed Point of Load Power Architectures Lead-free, Halogen-free, and RoHS Compliant Set Top Box Application Power Supplies ORDERING INFORMATION Base Part Standard Pack Orderable Part Package Type Form Quantity Number Number IR3448 PQFN 5mm x 6mm Tape and Reel 4000 IR3448MTRPBF IR3448 PBF Lead Free TR Tape and Reel Package Type M 1 Rev 3.6 May 17, 2016 IR3448 BASIC APPLICATION 5V<Vin<21V Vin PVin Boot Vo Vcc/ SW LDO out OCSet Vsns PGood RS+ PGood RS- Rt/SYNC RSo Fb Enable Comp CByp PGnd Gnd Figure 1: IR3448 Basic Application Circuit Figure 2: Efficiency Vin=12V, Fsw=600kHz PIN DIAGRAM 5mm X 6mm POWER QFN Top View PGnd SW 26 25 SW 24 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 NC 6 7 8 9 10 11 12 13 14 2 Rev 3.6 May 17, 2016 Vsns FB Comp RSo PGnd LGnd RS- RS+ CByp