RC5033M データシートの表示（PDF） - Raytheon Company

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RC5033M

Adjustable Synchronous DC-DC Converter

Raytheon Company 

Electronics

Semiconductor Division

RC5033

Adjustable Synchronous DC-DC Converter

Features

• >85% Efficiency

• 350uA quiescent current in shutdown

• Fast transient response

• Soft control power-up

• Over-Voltage Protection

• Output voltage range from 2.0V to 3.6V

• Factory trimmed low TC reference voltage

• Adjustable oscillator frequency

• Drives N-Channel MOSFETs

• 16 pin SOIC package

Applications

• 3.3V power supply for Pentium™ based CPU

motherboards

• 3.45V power supply for AMD-K5™ CPU

• 2.5V or 3.6V power supply for PowerPC™

Description

The RC5033 is a synchronous mode DC-DC controller IC

dedicated to providing a 5V to 2.0V up to 3.6V conversion

for various types of CPU power . It can be configured in both

the synchronous and non-synchronous modes and with the

proper applications circuitry can be used to deliver load cur-

rent greater than 10 Amps. The RC5033 is designed to oper-

ate in a standard PWM control mode under heavy load

conditions and as a PFM controller in light load conditions.

Its highly accurate low TC reference eliminates the need for

precision external components in order to achieve tight

tolerance voltage regulation. Through the use of external

resistors, the RC5033 can generate accurate output voltages

from 2.0V up to 3.6V. An integrated Over-Voltage protection

function constantly monitors the output voltage and shuts

down the power to the CPU in the event of a out-of-

tolerance voltage situation, thereby protecting the CPU.

The programmable oscillator can operate from 200KHz to

greater than 1MHz to provide for flexibility in choosing

external components such as inductors, capacitors, and

Power MOSFETs.

Block Diagram

OSC

+

–

+

I–

+

–

+

I–

DIGITAL

CONTROL

VIN

VO

VREF

VREF

65-5033-01

Rev. 0.9.5

PRELIMINARY INFORMATION describes products that are not in full production at the time of printing. Specifications are based on design goals

and limited characterization. They may change without notice. Contact Raytheon for current information.

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