Product category:
Power Supply ICs and Controllers
News Release from: International Rectifier | Subject: IRU3038
Edited by the Electronicstalk Editorial
Team on 27 February 2002
PWM controller powers DDR memories
The IRU3038 is a synchronous PWM controller IC for the termination voltage requirements of double-datarate (DDR) memory arrays.
The IRU3038 is a synchronous PWM controller IC for the termination voltage requirements of double-datarate (DDR) memory arrays The new device from International rectifier simplifies design and cuts component count, enabling cost-effective power management for DDR memory for currents in the 3 to 10A range
This article was originally published on Electronicstalk on 15 Feb 2001 at 8.00am (UK)
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The IRU3038 is offered in two packages, an economical narrow body SOIC-14 and a small size TSSOP-14 package.
To assure high data rate performance, DDR memory requires the termination voltage to be one half the supply voltage within 3%.
The IRU3038 integrates an error amplifier into the PWM controller package to make implementation of the termination voltage power management circuit easy and is capable of a voltage tracking accuracy of less than 1.5%.
The IRU3038 integrates a high-side and low-side driver, eliminating external drive circuitry.
This makes it easy to scale the design to drive multiple banks of memory.
In a synchronous buck convertor, the IRU3038 provides current levels up to 10A using the IRF7457 and IRF7460 HEXFET power mosfets.
For current levels up to 3A, the IRF7313 dual mosfet can be used.
The complementary and cost effective IRU3037 PWM controller combined with the IRF7457 and IRF7460 HEXFET mosfets is used to power the supply voltage.
Capable of operating with a single 5 or 12V supply voltage, the device can be programmed to operate between 200 and 400kHz using an external resistor, simplifying the optimisation of the design and layout to obtain the highest efficiency.
The use of a voltage mode control loop enables a simple, more cost-effective design.
The new device features undervoltage lockout for both VCC and VC supplies, an externally programmable soft start function as well as an output undervoltage detection that latches off the device when an output short is detected.
The IRU3038 features a 1.25V 1% reference that allows it to be used as a general purpose controller for onboard DC/DC conversion in applications such as graphics cards, desktop motherboards, set top boxes, communication equipment and hard disk drives.
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