IRU3146 Datasheet | International Rectifier

FEATURES Dual Synchronous Controller with 180 out-of-phase Configurable to 2-Independent Outputs or 2-Phase Single Output Current Sharing Using Inductor's DCR Current Limit using MOSFET's RDS(ON) Hiccup/Latched Current Limit ..Latched Over-Voltage Protection Vcc from 4.5V to 16V Input Programmable Switching Frequency up to 500KHz Two Independent Soft-Starts/ Shutdowns 0.8V Precision Reference Voltage Available Power Good Output External Frequency Synchronization DESCRIPTION The IRU3146 IC bines a Dual synchronous Buck controller, providing a cost-effective, high performance and flexible solution. The IRU3146 can configured as 2independent or as 2-phase controller. The 2-phase configuration is ideal for high current applications. The IRU3146 features 180 out of phase operation which reduces the required input/output capacitance and results to few number of capacitor quantity. Other key features offered by this device include two independent programmable soft starts, programmable switching frequency up to 500KHz per phase, under voltage lockout function. The current limit is provided by sensing the lower MOSFET's on-resistance for optimum cost and performance. 2-Phase Power Supply Graphic Card DDR Memory Applications D1 C12 APPLICATIONS Embedded puter Systems Tele Systems Point of Load Power Architectures 12V C11 C3 C4 C13 Q2 C14 L3 VCL Vc H1 VOUT3 Vc H2 Vcc HDrv1 OCSet1 Hiccup Sync VREF LDrv1 PGnd1 VP2 C5 R1 Q3 R5 C15 R10 1.8V @ 30A C16 R2 C8 R3 Rt U1 IRU3146 D2 BAT54A VSEN1 VSEN2 Fb1 Fb2 C17 R11 R7 p1 R9 C18 L4 R8 C9 R4 p2 HDrv2 OCSet2 R6 Q4 Q5 PGood C10 PGood SS1 / SD SS2 / SD LDrv2 PGnd2 Gnd Figure 1 - Typical application of IRU3146 in 2-phase configuration with inductor current sensing PACKAGE ORDER INFORMATION DEVICE IRU3146CF Rev. 1.1 6/25/04 PACKAGE 28-Pin TSSOP (F)...