FAN5018B Fairchild Semiconductor, FAN5018B Datasheet

FAN5018B

Manufacturer Part Number

FAN5018B

Description

6-Bit VID Controller 2-4 Phase VR10.X Controller

Manufacturer

Fairchild Semiconductor

Datasheet

1.FAN5018B.pdf (30 pages)

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Part Number:

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Features

• Improved Noise Immunity

• Improved Load Line Accuracy

• TTL Compatible VID Inputs

• Fully Pin and Function compatible with existing

• Precision Multi-Phase DC-DC Core Voltage Regulation

• Differential Remote Voltage Sensing

• Selectable 2-, 3-, or 4-Phase Operation

• Selectable VRM9 or VRM10 Operation

• Up to 1MHz per Phase Operation (4MHz ripple

• Lossless Inductor Current Sensing for Loadline

• Accurate Loadline Programming (Meets Intel

• Accurate Channel-Current Balancing for Thermal

• Convenient 12V Supply Biasing

• 6-bit Voltage Identification (VID) Input

• Adjustable Over Current Protection with Programmable

• Over-Voltage Protection – Internal OVP Crowbar

• Package: 28L-TSSOP

Applications

• VRM/VRD 9.x and 10.x Computer DC/DC Converter

• High-Current, Low-Voltage DC/DC Rail

Block Diagram

FAN5018B

6-Bit VID Controller 2-4 Phase VR10.X Controller

FAN5018 and ADP3180 Controllers

– ±14mV Output Voltage Accuracy Over Temperature

Frequency)

Compensation

– External Temperature Compensation

VRM/VRD10.x CPU Specifications)

Optimization and Layout Compensation

– .8375V to 1.600V in 12.5mV Steps

– Dynamic VID Capability with Fault-Blanking for

Latch-Off Delay. Latch-Off Function may be Disabled

Protection

glitch-less Output voltage Changes

FAN5018B

Φ1

Φ2

Φ3

Φ4

FAN5009

General Description

The FAN5018B is a multi-phase DC-DC controller for

implementing high-current, low-voltage, CPU core power

regulation circuits. It is part of a chipset that includes exter-

nal MOSFET drivers and power MOSFETS. The

FAN5018B drives up to four synchronous-rectified buck

channels in parallel. The multi-phase buck converter archi-

tecture uses interleaved switching to multiply ripple fre-

quency by the number of phases and reduce input and output

ripple currents. Lower ripple results in fewer components,

lower component cost, reduced power dissipation, and

smaller board area.

The FAN5018B features a high-bandwidth control loop to

provide optimal response to load transients. The FAN5018B

senses current using lossless techniques: Phase current is

measured through each of the output inductors. This current

information is summed, averaged and used to set the loadline

of the output via programmable "droop." The droop is tem-

perature compensated to achieve precise loadline character-

istics over the entire operating range. Additionally,

individual phase current is measured using the R

the low-side MOSFETs. This information is used to dynam-

ically balance/steer per-phase current. The phase currents

are also summed and averaged for over-current detection.

Dynamic-VID technology allows on-the-fly VID changes

with controlled, glitch-less output. Additionally, short-circuit

protection, adjustable current limiting, over-voltage protec-

tion and power-good circuitry combine to ensure reliable and

safe operation. FAN5018B is specified over the commercial

temperature range of 0°C to +85°C and operates from a sin-

gle +12V supply which simplifies design. FAN5018B is

available in a 28L-TSSOP package.

www.fairchildsemi.com

OUT

REV. 1.0.0 Jul/15/05

DS(ON)

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