PD-97662 TM 6A Highly Integrated SupIRBuck IR3898 Single-Input Voltage, Synchronous Buck Regulator - 1 - FEATURES DESCRIPTION TM The IR3898 SupIRBuck is an easy-to-use, fully Single 5V to 21V application integrated and highly efficient DC/DC regulator. Wide Input Voltage Range from 1.0V to 21V with The onboard PWM controller and MOSFETs make external Vcc IR3898 a space-efficient solution, providing accurate power delivery. Output Voltage Range: 0.5V to 0.86 Vin Enhanced Line/Load Regulation with Feed-Forward IR3898 is a versatile regulator which offers Programmable Switching Frequency up to 1.5MHz programmable switching frequency and the fixed internal current limit while operates in wide input and Internal Digital Soft-Start/Soft-Stop output voltage range. Enable input with Voltage Monitoring Capability The switching frequency is programmable from 300kHz Thermally Compensated Current Limit with robust to 1.5MHz for an optimum solution. hiccup mode over current protection Smart Internal LDO to improve light load and full load It also features important protection functions, such as efficiency Pre-Bias startup, thermally compensated current limit, External Synchronization with Smooth Clocking over voltage protection and thermal shutdown to give required system level security in the event of fault Enhanced Pre-Bias Start-Up conditions. Precision Reference Voltage (0.5V+/-0.5%) with margining capability Vp for Tracking Applications (Source/Sink Capability APPLICATIONS +/-6A) Netcom Applications Integrated MOSFET drivers and Bootstrap Diode Embedded Telecom Systems Thermal Shut Down Server Applications Programmable Power Good Output with tracking Storage Applications capability Distributed Point of Load Power Architectures Monotonic Start-Up o o Operating temp: -40 C < Tj < 125 C Small Size: 4mm x 5mm PQFN Lead-free, Halogen-free and RoHS Compliant BASIC APPLICATION 98 5V <Vin<21V 96 94 92 90 Vref S Ctrl Vin PVin Boot Vo 88 Vcc/ SW LDO out 86 PGood 84 Vsns PGood IR3898 82 Vp Vp 12Vin,Internal bias,Frequency 600KHz 80 Fb Rt/Sync 78 0.6 1.2 1.8 2.4 3 3.6 4.2 4.8 5.4 6 Comp Enable Gnd PGnd Load Current (A) 1.2Vout 3.3Vout Figure 1: IR3898 Basic Application Circuit Figure 2:IR3898 Efficiency 1 JANURARY 18, 2013 DATA SHEET Rev 3.5 Efficiency (%)PD-97662 TM 6A Highly Integrated SupIRBuck IR3898 Single-Input Voltage, Synchronous Buck Regulator - 2 - Package Tape & Reel Qty Part Number ORDERING INFORMATION M 750 IR3898MTR1PBF IR3898 M 4000 IR3898MTRPBF PBF Lead Free TR/TR1 Tape and Reel M Package Type PIN DIAGRAM 4mm x 5mm POWER QFN TOP VIEW PVin SW PGND 13 11 12 Vcc/LDO Out 14 10 Boot GND Vin Enable 15 9 17 VP 16 8 Vsns 1 2 3 4 5 6 7 o 32CW/ JA o 2/CW J -PCB 2 JANURARY 18, 2013 DATA SHEET Rev 3.5 Fb Vref Comp Gnd Rt/Sync S Ctrl PGood