Datasheet > FAN5236_04

FAN5236_04

更新时间： 2024-11-28 04:18:07

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
20页	234K
描述
Dual Mobile-Friendly DDR / Dual-output PWM Controller

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中文翻译

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FAN5236_04 数据手册

www.fairchildsemi.com

FAN5236

Dual Mobile-Friendly DDR / Dual-output PWM Controller

Features

General Description

• Highly ﬂexible dual synchronous switching PWM

controller includes modes for:

The FAN5236 PWM controller provides high efﬁciency and

regulation for two output voltages adjustable in the range

from 0.9V to 5.5V that are required to power I/O, chip-sets,

and memory banks in high-performance notebook comput-

ers, PDAs and Internet appliances. Synchronous rectiﬁcation

and hysteretic operation at light loads contribute to a high

efﬁciency over a wide range of loads. The hysteretic mode of

operation can be disabled separately on each PWM converter

if PWM mode is desired for all load levels. Efﬁciency is even

further enhanced by using MOSFET’s R_DS(ON)as a current

sense component.

– DDR mode with in-phase operation for reduced

channel interference

– 90˚ phase shifted two-stage DDR Mode for reduced

input ripple

– Dual Independent regulators 180° phase shifted

• Complete DDR Memory power solution

– V_TTTracks VDDQ/2

– VDDQ/2 Buffered Reference Output

• Lossless current sensing on low-side MOSFET or

precision over-current using sense resistor

• V_CCUnder-voltage Lockout

Feed-forward ramp modulation, average current mode con-

trol scheme, and internal feedback compensation provide

fast response to load transients. Out-of-phase operation with

180 degree phase shift reduces input current ripple. The con-

troller can be transformed into a complete DDR memory

power supply solution by activating a designated pin. In

DDR mode of operation one of the channels tracks the out-

put voltage of another channel and provides output current

sink and source capability — features essential for proper

powering of DDR chips. The buffered reference voltage

required by this type of memory is also provided. The

FAN5236 monitors these outputs and generates separate

PGx (power good) signals when the soft-start is completed

and the output is within 10ꢀ of its set point. A built-in

over-voltage protection prevents the output voltage from

going above 120ꢀ of the set point. Normal operation is auto-

matically restored when the over-voltage conditions go

away. Under-voltage protection latches the chip off when

either output drops below 75ꢀ of its set value after the soft-

start sequence for this output is completed. An adjustable

over-current function monitors the output current by sensing

the voltage drop across the lower MOSFET. If precision cur-

rent-sensing is required, an external current-sense resistor

may optionally be used.

• Converters can operate from +5V or 3.3V or Battery

power input (5 to 24V)

• Excellent dynamic response with Voltage Feed-Forward

and Average Current Mode control

• Power-Good Signal

• Also supports DDR-II and HSTL

• Light load Hysteretic mode maximizes efﬁciency

• QSOP28, TSSOP28

Applications

• DDR V_DDQand V_TTvoltage generation

• Mobile PC dual regulator

• Server DDR power

• Hand-Held PC power

REV. 1.1.9 7/12/04

12 3 4 5 6 7...20

中文翻译

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与FAN5236_04相关器件

型号	品牌	获取价格	描述	数据表
FAN5236_10	FAIRCHILD	获取价格	Dual Mobile-Friendly DDR / Dual-Output PWM Controller
FAN5236MTC	FAIRCHILD	获取价格	Dual Mobile-Friendly DDR / Dual-output PWM Controller
FAN5236MTC_NL	FAIRCHILD	获取价格	暂无描述
FAN5236MTCX	FAIRCHILD	获取价格	Dual Mobile-Friendly DDR / Dual-output PWM Controller
FAN5236MTCX	ONSEMI	获取价格	PWM/PFM 控制器，宽输入电压，双输出/DDR
FAN5236MTCX_NL	FAIRCHILD	获取价格	暂无描述
FAN5236QSC	FAIRCHILD	获取价格	Dual Mobile-Friendly DDR / Dual-output PWM Controller
FAN5236QSCX	FAIRCHILD	获取价格	Dual Mobile-Friendly DDR / Dual-output PWM Controller
FAN5236QSCX_NL	FAIRCHILD	获取价格	Dual Switching Controller, Current-mode, 345kHz Switching Freq-Max, PDSO28, LEAD FREE, QSO
FAN5240	FAIRCHILD	获取价格	Multi-Phase PWM Controller for AMD Mobile Athlon TM and Duron TM

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