LTC1709EG-8

更新时间： 2024-09-23 22:25:55

品牌	Logo	应用领域
凌特 - Linear		稳压器开关
页数	文件大小	规格书
28页	299K
描述
2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulators

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LTC1709EG-8 数据手册

Final Electrical Specifications

LTC1709-8/LTC1709-9

2-Phase, 5-Bit VID,

Current Mode, High Efficiency,

Synchronous Step-Down Switching Regulators

May 2000

DESCRIPTIO

FEATURES

The LTC^®1709-8/LTC1709-9 are 2-phase, VID program-

mable, synchronous step-down switching regulator con-

trollersthatdrivetwoallN-channelexternalpowerMOSFET

stages in a fixed frequency architecture. The 2-phase

controller drives its two output stages out of phase at

■

Single Controller Operates Two Output Stages:

Antiphase Reducing Required Input Capacitance

and Power Supply Induced Noise

■

Two 5-Bit Desktop VID Codes:

LTC1709-8 For VRM8.4 (V_OUTfrom 1.3V to 3.5V)

LTC1709-9 For VRM9.0 (V_OUTfrom 1.1V to 1.85V) frequencies up to 300kHz to minimize the RMS ripple

■

Current Mode Control Ensures Best Current Sharing

True Remote Sensing Differential Amplifier

Power Good Output Indicator

currents in both input and output capacitors. The 2-phase

techniqueeffectivelymultipliesthefundamentalfrequency

by two, improving transient response while operating

each channel at an optimum frequency for efficiency.

Thermal design is also simplified.

OPTI-LOOP^TMCompensation Minimizes C_OUT

Programmable Fixed Frequency: 150kHz to 300kHz

±1% Output Voltage Accuracy

An internal differential amplifier provides true remote

sensing of the regulated supply’s positive and negative

output terminals as required for high current applications.

Wide V_INRange: 4V to 36V Operation

Adjustable Soft-Start Current Ramping

Internal Current Foldback and Short-Circuit Shutdown

Overvoltage Soft Latch Eliminates Nuisance Trips

Low Shutdown Current: 20µA

The RUN/SS pin provides soft-start and optional timed,

short-circuit shutdown. Current foldback limits MOSFET

dissipation during short-circuit conditions when the

overcurrent latchoff is disabled. OPTI-LOOP compensa-

tion allows the transient response to be optimized for a

wide range of output capacitors and ESR values. The

LTC1709-8/LTC1709-9 implement two different VID

tables compliant with VRM8.4 and VRM9.0 respectively.

^{Available in 36-L}U^{ead SSOP Package}

APPLICATIO S

■

Workstations

Internet Servers

Large Memory Arrays

DC Power Distribution Systems

■

, LTC and LT are registered trademarks of Linear Technology Corporation.

OPTI-LOOP is a trademark of Linear Technology Corporation.

■

TYPICAL APPLICATIO

5V TO 28V

10µF

35V

×4

0.1µF

TG1

0.002Ω

RUN/SS

BOOST1

SW1

0.47µF

220pF

3.3k

1µH

LTC1709-8

BG1

SGND

PGND

SENSE1

PGOOD

–

5 VID BITS VID0–VID4

TG2

BOOST2

SW2

0.002Ω

OUT

1.3V TO 3.5V

40A

EAIN

0.47µF

1µH

ATTENOUT

ATTENIN

BG2

INTV

DIFFOUT

10µF

OUT

–

SENSE2

1000µF

–

×2

17097 F01

Figure 1. High Current Dual Phase Step-Down Converter

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.

12 3 4 5 6 7...28

中文翻译

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LTC1709EG-8 替代型号

型号	品牌	替代类型	描述	数据表
LTC1709EG-8#PBF	Linear	功能相似	LTC1709-8 - 2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switc

与LTC1709EG-8相关器件

型号	品牌	获取价格	描述	数据表
LTC1709EG-8#PBF	Linear	获取价格	LTC1709-8 - 2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switc
LTC1709EG-8#TR	Linear	获取价格	LTC1709-8 - 2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switc
LTC1709EG-8#TRPBF	Linear	获取价格	LTC1709-8 - 2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switc
LTC1709EG-85	Linear	获取价格	2-Phase, 5-Bit VID,Current Mode, High Efficiency,Synchronous Step-Down Switching Regulator
LTC1709EG-85#PBF	Linear	获取价格	暂无描述
LTC1709EG-85#TR	Linear	获取价格	LTC1709-85 - 2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Swit
LTC1709EG-85#TRPBF	Linear	获取价格	LTC1709-85 - 2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Swit
LTC1709EG-9	Linear	获取价格	2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulat
LTC1709EG-9#PBF	Linear	获取价格	LTC1709-9 - 2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switc
LTC1709EG-9#TR	Linear	获取价格	LTC1709-9 - 2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switc

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