IRU3037APBF Datasheet | International Rectifier

Data Sheet No. PD94173 rev D IRU3037/IRU3037A & (Pb F) 8-PIN SYNCHRONOUS PWM CONTROLLER Features Synchronous Controller in 8-Pin Package Operating with single 5V or 12V supply voltage Internal 200KHz Oscillator (400KHz for IRU3037A) Soft-Start Function Fixed Frequency Voltage Mode 500m A Peak Output Drive Capability Protects the output when control FET is shorted SOIC 8-Lead also available LEAD-FREE APPLICATIONS DDR memory source sink Vtt application Low cost on-board DC to DC such as 5V to 3.3V, 2.5V or 1.8V Graphic Card Hard Disk Drive DESCRIPTION The IRU3037 controller IC is designed to provide a low cost synchronous Buck regulator for on-board DC to DC converter applications. With the migration of today’s ASIC products requiring low supply voltages such as 1.8V and lower, together with currents in excess of 3A, traditional linear regulators are simply too lossy to be used when input supply is 5V or even in some cases with 3.3V input supply. The IRU3037 together with dual N-channel MOSFETs such as IRF7313, provide a low cost solution for such applications. This device Features an internal 200KHz oscillator (400KHz for "A" version), under-voltage lockout for both Vcc and Vc supplies, an external programmable soft-start function as well as output under-voltage detection that latches off the device when an output short is detected. TYPICAL APPLICATION 12V C3 C4 1u F 1u F C2 10TPB100M, 100u F, 55mΩ L1 1u H 5V C1 47u F C8 0.1u F C9 2200p F R4 24k Vcc Vc HDrv SS/SD U1 IRU3037 LDrv p Gnd Fb Q1 1/2 of IRF7313 L2 D05022P-562, 5.6u H, 5.3A Q2 1/2 of IRF7313 R5 1.24K, 1% R3 249,...