Datasheet > FAN5026_11

FAN5026_11

更新时间： 2024-11-21 12:50:07

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		双倍数据速率控制器
页数	文件大小	规格书
17页	758K
描述
Dual DDR / Dual-Output PWM Controller

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中文翻译

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数据手册

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FAN5026_11 数据手册

March 2011

FAN5026

Dual DDR / Dual-Output PWM Controller

Features

Description

The FAN5026 PWM controller provides high efficiency

and regulation for two output voltages adjustable in the

range of 0.9V to 5.5V required to power I/O, chipꢀsets,

and memory banks in highꢀperformance computers,

setꢀtop boxes, and VGA cards. Synchronous

rectification and hysteretic operation at light loads

contribute to high efficiency over a wide range of loads.

Efficiency is enhanced by using MOSFET R_DS(ON)as a

currentꢀsense component.

ꢀ

Highly Flexible, Dual Synchronous Switching PWM

Controller that Includes Modes for:

DDR Mode with Inꢀphase Operation for

Reduced Channel Interference

90° Phaseꢀshifted, Twoꢀstage DDR Mode

for Reduced Input Ripple

Dual Independent Regulators, 180° Phase

Shifted

ꢀ

Complete DDR Memory Power Solution

Feedforward ramp modulation, averageꢀcurrent mode

control, and internal feedback compensation provide

fast response to load transients. Outꢀofꢀphase operation

with 180ꢀdegree phase shift reduces input current

ripple. The controller can be transformed into a

complete DDR memory power supply solution by

activating a designated pin. In DDR Mode, one of the

channels tracks the output voltage of another channel

and provides output current sink and source capability

— essential for proper powering of DDR chips. The

buffered reference voltage required by this type of

memory is also provided. The FAN5026 monitors these

outputs and generates separate PGx (power good)

signals when the softꢀstart is completed and the output

is within ±10% of the set point.

V_TTTracks V_DDQ/2

V_DDQ/2Buffered Reference Output

Lossless Current Sensing on LowꢀSide MOSFET or

Precision OverꢀCurrent Using Sense Resistor

ꢀ

V_CCUnderꢀVoltage Lockout

Wide Input Range: 3V to 16V

Excellent Dynamic Response with Voltage

Feedforward and Average CurrentꢀMode Control

ꢀ

PowerꢀGood Signal

Supports DDRꢀII and HSTL

28ꢀLead ThinꢀShrink SmallꢀOutline Package

Overꢀvoltage protection prevents the output voltage

from exceeding 120% of the set point. Normal operation

is automatically restored when overꢀvoltage conditions

cease. Underꢀvoltage protection latches the chip off

when output drops below 75% of the set value after the

softꢀstart sequence for this output is completed. An

adjustable overꢀcurrent function monitors the output

current by sensing the voltage drop across the lower

MOSFET. If precision currentꢀsensing is required, an

external currentꢀsense resistor may be used.

Applications

ꢀ

DDR V_DDQand V_TTVoltage Generation

PC Dual Power Supply

Server DDR Power

Desktop Computer

Graphics Cards

Related Resources

ꢀ

Application Note — AN-6002 Component

Calculations and Simulation Tools

Ordering Information

Operating

Part Number

Temperature

Range

Package

28ꢀLead ThinꢀShrink SmallꢀOutline Package (TSSOP)

Packing Method

Tape and Reel

FAN5026MTCX

ꢀ40 to +85°C

FAN5026 • Rev. 1.0.8

www.fairchildsemi.com

12 3 4 5 6 7...17

中文翻译

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与FAN5026_11相关器件

型号	品牌	获取价格	描述	数据表
FAN5026MTC	FAIRCHILD	获取价格	Dual DDR/Dual-output PWM Controller
FAN5026MTCX	FAIRCHILD	获取价格	Dual DDR/Dual-output PWM Controller
FAN5026MTCX	ONSEMI	获取价格	PWM 控制器，双输出/DDR
FAN5026MTCX_NL	FAIRCHILD	获取价格	Dual Switching Controller, Current-mode, 345kHz Switching Freq-Max, PDSO28, LEAD FREE, MO-
FAN5029	FAIRCHILD	获取价格	8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller
FAN5029_07	FAIRCHILD	获取价格	8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller
FAN5029MPX	FAIRCHILD	获取价格	8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller
FAN5029MPX_NAAC238	FAIRCHILD	获取价格	Switching Controller, 1000kHz Switching Freq-Max, LEAD FREE, MLP-40
FAN5029MPX-NAAC238	FAIRCHILD	获取价格	8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller
FAN5031	FAIRCHILD	获取价格	8-Bit Programmable, 2 to 4 Phase, Synchronous Buck Controller

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