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US3011

UNISEM
Part Number US3011
Manufacturer UNISEM
Description 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC
Published Apr 16, 2005
Detailed Description US3011 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC PRELIMINARY DATASHEET FEATURES Dual Layout Compatible with HIP...
Datasheet PDF File US3011 PDF File

US3011
US3011

Overview
US3011 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC PRELIMINARY DATASHEET FEATURES Dual Layout Compatible with HIP6004A Designed to meet Intel specification of VRM8.
4 for Pentium III™ On board DAC programs the output voltage from 1.
3V to 3.
5V.
The US3011 remains on for VID code of (11111).
Loss less Short Circuit Protection Synchronous operation allows maximum efficiency Patented architecture allows fixed frequency operation as well as 100% duty cycle during dynamic load Over Voltage Protection Output Soft Start High current totem pole driver for direct driving of the external Power MOSFET Power Good function DESCRIPTION The US3011controller IC is specifically designed to meet Intel specification for latest Pentium III™ microprocessor applications as well as the next generation P6 family processors.
These products feature a patented topology that in combination with a few external components as shown in the typical application circuit ,will provide in excess of 20A of output current for an on- board DC/DC converter while automatically providing the right output voltage via the 5 bit internal DAC.
These devices also features, loss less current sensing by using the Rdson of the high side Power MOSFET as the sensing resistor, a Power Good window comparator that switches its open collector output low when the output is outside of a ±10% window and an OVP output.
Other features of the device are ; Undervoltage lockout for both 5V and 12V supplies , an external programmable soft start function as well as programming the oscillator frequency by using an external capacitor.
APPLICATIONS Pentium III & Pentium II™ processor DC to DC converter application Low cost Pentium with AGP TYPICAL APPLICATION L1 L2 Q1 5V C5 C1 C3 R2 R1 C8 Q2 R3 R4 C10 C6 C11 D1 C4 R7 18 V12 11 NC/Gnd 2 CS+ 14 HDrv 15 NC/ Boot 13 CS17 LDrv 16 Gnd 1 NC/Sen Vfb 10 R5 V5/Comp 9 D3 7 D2 6 D1 5 D0 4 Ct/Rt 20 OVP 19 PGd 12 C9 R6 R8 12V R9 C12 C13 US3011 3 SS C2 D4 8 VID4 VID3 VID2 VID1 VID0 ...


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