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US3018

UNISEM
Part Number US3018
Manufacturer UNISEM
Description 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS LDO CONTROLLER AND 200mA LDO ON BOARD
Published Apr 16, 2005
Detailed Description US3018 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS LDO CONTROLLER AND 200mA LDO ON BOARD FEATURES Provides Single Chip Solu...
Datasheet PDF File US3018 PDF File

US3018
US3018

Overview
US3018 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS LDO CONTROLLER AND 200mA LDO ON BOARD FEATURES Provides Single Chip Solution for Vcore, GTL+ & Clock Supply 200 mA On board LDO regulator Designed to meet the latest Intel specification for Pentium II™ On board DAC programs the output voltage from 1.
3V to 3.
5V Linear regulator controller on board for 1.
5V GTL+ supply Loss less Short Circuit Protection with HICCUP Synchronous operation allows maximum efficiency Patented architecture allows fixed frequency operation as well as 100% duty cycle during dynamic load Soft Start High current totem pole driver for direct driving of the external Power MOSFET Power Good function Monitors all Outputs OVP Circuitry Protects the Switcher Output and generates a Fault signal Thermal Shutdown Logic Level Enable Input DESCRIPTION PRELIMINARY DATASHEET APPLICATIONS Total Power Soloution for Pentium II processor application The US3018 controller IC is specifically designed to meet Intel specification for Pentium II™ microprocessor applications as well as the next generation of P6 family processors.
The US3018 provides a single chip controller IC for the Vcore , LDO controller for GTL+ and an internal 200mA regulator for clock supply which are required for the Pentium II applications.
These devices feature a patented topology that in combination with a few external components as shown in the typical application circuit ,will provide in excess of 18A of output current for an on- board DC/DC converter while automatically providing the right output voltage via the 5 bit internal DAC.
The US3018 also features, loss less current sensing for both switchers by using the Rds-on of the high side Power MOSFET as the sensing resistor, internal current limiting for the clock supply, a Power Good window comparator that switches its open collector output low when any one of the outputs is outside of a pre programmed window.
Other features of the device are ; Undervoltage lockout for both 5V and 12V ...


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