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IRU3038CF Datasheet(PDF) 1 Page - International Rectifier |
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IRU3038CF Datasheet(HTML) 1 Page - International Rectifier |
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1 / 18 page  IRU3038 1 Rev. 2.0 09/12/02 www.irf.com TYPICAL APPLICATION DESCRIPTION The IRU3038 controller IC is designed to provide a low cost synchronous Buck regulator for voltage tracking applications such DDR memory and general purpose on-board DC to DC converter. Modern micro processors combined with DDR memory, need high-speed bandwidth data bus which requires a particular bus termination volt- age. This voltage will be tightly regulated to track the half of chipset voltage for best performance. The IRU3038 together with dual N-channel MOSFETs such as IRF7313, provide a low cost solution for such applications. This device features a programmable frequency set from 200KHz to 400KHz, 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. Synchronous Controller in 14-Pin Package Operating with single 5V or 12V supply voltage 200KHz to 400KHz operation set by an external resistor Soft-Start Function Fixed Frequency Voltage Mode 500mA Peak Output Drive Capability Uncommitted Error Amplifier available for DDR voltage tracking application 1.25V Reference Voltage Protects the output when control FET is shorted PACKAGE ORDER INFORMATION FEATURES SYNCHRONOUS PWM CONTROLLER FOR TERMINATION POWER SUPPLY APPLICATIONS TA (°C) DEVICE PACKAGE 0 To 70 IRU3038CF 14-Pin Plastic TSSOP (F) 0 To 70 IRU3038CS 14-Pin Plastic SOIC NB (S) PRELIMINARY DATA SHEET Data Sheet No. PD94250 Figure 1 - Typical application of IRU3038 when Vtt tracks the VDDQ. 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 IRU3038 U1 Vcc Vc HDrv LDrv Fb Gnd Comp SS C1 0.1uF C2 1uF C5 0.1uF C7 2200pF R3 33K Q1 1/2 of IRF7313 Q2 1/2 of IRF7313 L2 D03316P-103, 10uH, 3.9A L1 1uH C3 10TPB100M, 100uF, 55m V C4 47uF Vtt 1.25V @ 3A C6 2x 6TPB150M, 150uF, 55m V 12V PGnd Rt VP VREF R1 1K R2 1K DDR Memory VDDQ (2.5V) 5V D1 BAT54 or 1N4148 |
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