FAN5018BMTCX

FAN5018BMTCX Datasheet


FAN5018B

Part Datasheet
FAN5018BMTCX FAN5018BMTCX FAN5018BMTCX (pdf)
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FAN5018B
6-Bit VID Controller 2-4 Phase VR10.X Controller
• Improved Noise Immunity
• Improved Load Line Accuracy
• TTL Compatible VID Inputs
• Fully Pin and Function compatible with existing

FAN5018 and ADP3180 Controllers
• Precision Multi-Phase DC-DC Core Voltage Regulation
±14mV Output Voltage Accuracy Over Temperature
• Differential Remote Voltage Sensing
• Selectable 2-, 3-, or 4-Phase Operation
• Selectable VRM9 or VRM10 Operation
• Up to 1MHz per Phase Operation 4MHz ripple

Frequency
• Lossless Inductor Current Sensing for Loadline

Compensation External Temperature Compensation
• Accurate Loadline Programming Meets VRM/VRD10.x CPU Specifications
• Accurate Channel-Current Balancing for Thermal Optimization and Layout Compensation
• Convenient 12V Supply Biasing
• 6-bit Voltage Identification VID Input .8375V to 1.600V in 12.5mV Steps Dynamic VID Capability with Fault-Blanking for
glitch-less Output voltage Changes
• Adjustable Over Current Protection with Programmable

Latch-Off Delay. Latch-Off Function may be Disabled
• Over-Voltage Protection Internal OVP Crowbar

Protection
• Package 28L-TSSOP
• VRM/VRD 9.x and 10.x Computer DC/DC Converter
• High-Current, Low-Voltage DC/DC Rail

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 external MOSFET drivers and power MOSFETS. The FAN5018B drives up to four synchronous-rectified buck channels in parallel. The multi-phase buck converter architecture uses interleaved switching to multiply ripple frequency 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 temperature compensated to achieve precise loadline characteristics over the entire operating range. Additionally, individual phase current is measured using the RDS ON of the low-side MOSFETs. This information is used to dynamically 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 protection 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 single +12V supply which simplifies design. FAN5018B is available in a 28L-TSSOP package.

Block Diagram

FAN5009

FAN5018B

FAN5009

VOUT

FAN5018B

Pin Assignments

VID4 1 VID3 2 VID2 3 VID1 4 VID0 5 VID5/SEL 6 FBRTN 7

FB 8 COMP 9 PWRGD 10

EN 11 DELAY 12

RT 13 RAMPADJ 14

FAN5018B TSSOP-28
28 VCC 27 PWM1 26 PWM2 25 PWM3 24 PWM4 23 SW1 22 SW2 21 SW3 20 SW4 19 GND 18 CSCOMP 17 CSSUM 16 CSREF 15 ILIMIT

PRODUCT SPECIFICATION

Pin Definitions

Pin Number

Pin Name VID [4:0]

VID5/SEL

Pin Function Description

VID inputs. Determines the output voltage via the internal DAC. These inputs comply to VRM10/VRD10 specifications for static and dynamic operation. All have internal pull-ups 1.25V for VRM10 and 2.5V for VRM9 so leaving them open results in logic high. Leaving VID[4:0] open results in a "No CPU" condition disabling the PWM outputs.

VID5 Input/DAC Select. Dual function pin that is either the 12.5mV DAC LSB for VRM10 or selects the VRM9 DAC codes when forced higher than Vtblsel VRM9 voltage. The truth table is as follows:

VVID5/SEL held > Vtblsel VRM9 DAC table is selected See Table 3 VViD5/SEL < Vtblsel VRM10 DAC table is selected See Table 2 and VViD5/SEL pin is used as VID5 input.

FBRTN Feedback Return. Error Amp and DAC reference point.

Feedback Input. Inverting input for Error Amp this pin is used for external
compensation. This pin can also be used to introduce DC offset voltage to the
output.

COMP Error Amp output. This pin is used for external compensation.
Ordering Information

Part Number FAN5018BMTCX

Temperature Range 0°C to +85°C

Pb Free Yes

PRODUCT SPECIFICATION

Package TSSOP-28

Packing Tape and Reel

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:

Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.

A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

Jul/15/05 0.0m 005 Stock#DS30005019 2003 Fairchild Semiconductor Corporation
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Datasheet ID: FAN5018BMTCX 513900