IRU3037A

) m oc .U 4 t eeh S ata D.w w w : t eeh S ata D ( Data Sheet No. PD94173 IRU3037 / IRU3037A 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 500mA Peak Output Drive Capability Protects the output when control FET is shorted 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. 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 TYPICAL APPLICATION 5V 12V C3 1uF C4 1uF C2 10TPB100M, 100uF, 55mV L1 1uH C1 47uF Vcc Vc HDrv Q1 1/2 of IRF7313 L2 1.5V/5A C7 2x 6TPC150M, ...