# US3012/3012A Controller IC

## Features

️· Designed for Pentium II & Pentium Pro processors.
️· Provides >16A output current for on-board DC/DC converters.
️· 5-bit DAC for automatic voltage programming (1.3-3.5V US3010, 1.8-3.5V US3010A).
️· Lossless current sensing using MOSFET Rds(on).
️· Power Good function with ±10% window comparator.
️· Undervoltage lockout for 5V and 12V supplies.
️· External programmable soft start.
️· Oscillator frequency programmable with external capacitor.
️· Synchronous operation for maximum efficiency.
️· Compatible layout with RC5051.

## Applications

️· Pentium II & Pentium Pro DC-DC converter.
️· Low-cost Pentium with AGP.

## Electrical Specifications

️· VID Input: LO: 0.4V, HI: 2V
️· Power Good: LO: 0.4V @ 3mA, HI: 4.8V @ 5kΩ pull-up.
️· Soft Start Current: 10 µA
️· UVLO Threshold (12V): 9.2-10.8V
️· UVLO Threshold (5V): 4.1-4.5V
️· Operating Supply Current (V5): 20 mA
️· Operating Supply Current (V12): 14 mA

## Package Information

️· Package Type: 20-pin Plastic SOIC WB
️· Operating Temperature: 0 to 70°C
️· Device: US3012CW (1.3V-3.5V range), US3012ACW (1.8V-3.5V range).

## Key Components (Example Application)

️· MOSFETs: IRL3103 (Q1, Q2)
️· Inductor: L = 3 uH
️· Output Capacitor: 1500µF, 6.3V (6 in parallel)
️· Diode: D1 (open/short selectable for layout compatibility)

## Pin Descriptions (Selected)

️· D0-D4: DAC inputs for voltage programming.
️· Vfb: Feedback input for error comparator.
️· CS+ / CS-: Current sensing inputs.
️· SS: Soft start control.
️· Ct: Oscillator frequency programming.
️· V5 / V12: Power supply inputs.
️· LDrv / HDrv: Output drivers for MOSFETs.
️· PGd: Power Good output.