IRU3037A Datasheet | International Rectifier

) 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 500m A 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 1u F C4 1u F C2 10TPB100M, 100u F, 55m V L1 1u H C1 47u F Vcc Vc HDrv Q1 1/2 of IRF7313 L2 1.5V/5A C7 2x 6TPC150M, 150u F, 40m V C8 0.1u F SS/SD U1 IRU3037 LDrv D05022P-562, 5.6u H, 5.3A Q2 1/2 of IRF7313 R3 C9 2200p F R4 24k p Fb Gnd R5 1.24K, 1% 249, 1% Figure 1 - Typical application of IRU3037 or IRU3037A. PACKAGE ORDER INFORMATION TA (°C) 0 To 70 0 To 70 0 To 70 0 To 70 DEVICE IRU3037CF IRU3037CS IRU3037ACF IRU3037ACS PACKAGE 8-Pin Plastic TSSOP (F) 8-Pin Plastic SOIC NB (S) 8-Pin Plastic TSSOP (F) 8-Pin Plastic SOIC NB (S) FREQUENCY 200KHz 200KHz 400KHz 400KHz Rev. 2.8...