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US3012

UNISEM
Part Number US3012
Manufacturer UNISEM
Description 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC
Published Apr 16, 2005
Detailed Description US3012/3012A 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC PRELIMINARY DATASHEET FEATURES Dual Layout Compatible wi...
Datasheet PDF File US3012 PDF File

US3012
US3012

Overview
US3012/3012A 5 BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC PRELIMINARY DATASHEET FEATURES Dual Layout Compatible with RC5051 Designed to meet Intel specification of VRM8.
2 & VRM8.
3 for Pentium II™ On board DAC programs the output voltage from 1.
3V to 3.
5V (US3010) & 1.
8V to 3.
5V for US3010A 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 Soft Start High current totem pole driver for direct driving of the external Power MOSFET Power Good function DESCRIPTION The US3012 family of controller ICs are specifically designed to meet Intel specification for Pentium II™ and Pentium Pro™ 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 below ,will provide in excess of 16A 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 feature, loss less current sensing by using the Rds-on 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 .
Other features of the device are ; Undervoltage lockout for both 5V and 12V supplies as well as an external programmable soft start function as well as programming the oscillator frequency by using an external capacitor.
APPLICATIONS Pentium II & Pentium Pro™ processor DC to DC converter application Low cost Pentium with AGP TYPICAL APPLICATION L1 L2 Q1 C5 C1 C3 R3 R5 Q2 R6 R2 R4 C7 C11 R7 R8 R9 5V C4 C6 R10 R1 D1 R11 13 V12 7 NC/Vccp 6 V5 4 CS+ 12 HDrv 5 CS9 LDrv 10 Gnd 14 Vfb/ GndD En 2 R12 R13 12V OutEn Power Good C9 C10 US3012 16 SS/Vref C2 D4 8 D3 17 D2 18 D1 19 D0 20 NC/ GndP 11 NC/ GndA 15 PGd 3 Ct 1 C8 VID...


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