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IR3621M Datasheet(PDF) 1 Page - International Rectifier |
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IR3621M Datasheet(HTML) 1 Page - International Rectifier |
1 / 29 page IR3621&(PbF) 1 www.irf.com Data Sheet No.PD60231 revA DESCRIPTION The IR3621 IC combines a dual synchronous buck control- ler and drivers, providing a cost-effective, high performance and flexible solution. The IR3621 operates in 2-Phase mode to produce either 2-independent output voltages or current share single output for high current application. The 180 ! out-of-phase operation allows the reduction of input and output capacitance. Other key features include two independently programmable soft-start functions to allow system level sequencing of out- put voltages in various configurations. The pre-bias protec- tion feature prevents the discharge of the output voltage and possible damage to the load during start-up when a pre- existing voltage is present at the output. Programmable switching frequency up to 500KHz per phase allows flexibil- ity to tune the operation of the IC to meet system level re- quirements, and synchronization allows the simplification of system level filter design. Protection features such as selectable hiccup or latched current limit, and under voltage lock-out are provided to give required system level security in the event of a fault condition. FEATURES 2-PHASE / DUAL SYNCHRONOUS PWM CONTROLLER WITH OSCILLATOR SYNCHRONIZATION AND PRE-BIAS STARTUP Figure 1 - Typical application of IR3621 in current share single output and 2-independent output voltage configuration APPLICATIONS Embedded Networking & Telecom Systems Distributed Point-of-Load Power Architectures 2-Phase Power Supply Graphics Card DDR Memory Applications Dual Synchronous Controller with 180 ! Out of Phase Operation Configurable to 2-Independent Outputs or Current Share Single Output Voltage Mode Control Current Sharing Using Inductor's DCR Selectable Hiccup or Latched Current Limit using MOSFET's RDS(on) sensing Latched Over-Voltage Protection Pre-Bias Start Up Programmable Switching Frequency up to 500KHz Two Independent Soft-Starts/Shutdowns Precision Reference Voltage 0.8V Power Good Output External Frequency Synchronization Thermal Protection Vin Vout PGnd1 LDrv1 HDrv1 LDrv2 HDrv2 Gnd Comp2 Comp1 SS1 / SD IR3621 Rt SS2 / SD PGnd2 OCSet2 OCSet1 Vin Vin Vout1 PGnd1 LDrv1 HDrv1 LDrv2 HDrv2 Gnd Comp2 Comp1 SS1 / SD IR3621 Rt SS2 / SD PGnd2 OCSet2 OCSet1 Vin Vout2 Current share, single output configuration 2-independent output voltage configuration PKG DESIG M M F F PART LEADFREE NUMBER PART NUMBER IR3621M IR3621MPbF IR3621MTR IR3621MTRPbF IR3621F N/A IR3621FTR N/A PARTS PER TUBE 73 ------ 50 ------ PARTS PER REEL ------ 6000 ------ 2500 ORDERING INFORMATION PIN COUNT 32 32 28 28 T & R Orientation Fig A |
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