Datasheet > LTC1709-7

LTC1709-7

更新时间： 2024-09-23 21:54:43

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	319K
描述
2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulator

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LTC1709-7 数据手册

LTC1709-7

2-Phase, 5-Bit VID,

Current Mode, High Efficiency,

Synchronous Step-Down Switching Regulator

FEATURES

DESCRIPTIO

■

Output Stages Operate Antiphase Reducing Input

Capacitance Requirements and Power Supply

Induced Noise

TheLTC^®1709-7isa2-phase,VIDprogrammable,synchro-

nous step-down switching regulator controller that drives

twoallN-channelexternalpowerMOSFETstagesinafixed

frequencyarchitecture.The2-phasecontrollerdrivesitstwo

output stages out of phase at frequencies up to 300kHz to

minimize the RMS ripple currents in both input and output

capacitors.The2-phasetechniqueeffectivelymultipliesthe

fundamental frequency by two, improving transient re-

sponse while operating each channel at an optimum fre-

■

Dual Input Supply Capability for Load Sharing

5-Bit Mobile VID Code: V_OUT= 0.925V to 2V

Current Mode Control Ensures Current Sharing

True Remote Sensing Differential Amplifier

Power Good Output Indicator

OPTI-LOOP^TMCompensation Minimizes C_OUT

Three Operational Modes: PWM, Burst and Cycle Skip quency for efficiency. Thermal design is also simplified.

Programmable Fixed Frequency: 150kHz to 300kHz

An operating mode select pin (FCB) can be used to regu-

±1% Output Voltage Accuracy

late a secondary winding or select among three modes

Wide V_INRange: 4V to 36V Operation

includingBurstMode^TMoperationforhighestefficiency.An

Adjustable Soft-Start Current Ramping

internaldifferentialamplifierprovidestrueremotesensing

Internal Current Foldback and Short-Circuit Shutdown

of the regulated supply’s positive and negative output ter-

Overvoltage Soft Latch Eliminates Nuisance Trips

minals as required in high current applications.

Active Voltage Positioning Capable

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

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

short-circuit shutdown. Current foldback limits MOSFET

APPLICATIO S

■

dissipation during short-circuit conditions when the

overcurrentlatchoffisdisabled.OPTI-LOOPcompensation

allows the transient response to be optimized for a wide

range of output capacitors and ESR values.

Mobile/Desktop Computers

Internet Servers

Large Memory Arrays

■

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

OPTI-LOOP and Burst Mode are trademarks of Linear Technology Corporation.

■

DC Power Distribution Systems

TYPICAL APPLICATIO

5V TO 28V

10µF

35V

×4

0.1µF

FCB

TG1

0.002Ω

RUN/SS

BOOST1

SW1

0.47µF

220pF

3.3k

1µH

LTC1709-7

BG1

SGND

PGND

SENSE1

PGOOD

–

5 VID BITS VID0–VID4

TG2

BOOST2

SW2

0.002Ω

OUT

0.925V TO 2V

40A

EAIN

0.47µF

1µH

ATTENOUT

ATTENIN

BG2

INTV

DIFFOUT

10µF

OUT

–

SENSE2

1000µF

–

×2

170989 F01

Figure 1. High Current Dual Phase Step-Down Converter

12 3 4 5 6 7...28

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与LTC1709-7相关器件

型号	品牌	获取价格	描述	数据表
LTC1709-8	Linear	获取价格	2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulat
LTC1709-8	ADI	获取价格	两相、5 位 VID、电流模式、高效率、同步降压型开关稳压器
LTC1709-8_1	Linear	获取价格	2-Phase, 5-Bit VID,Current Mode, High Efficiency,Synchronous Step-Down Switching Regulator
LTC1709-8_15	Linear	获取价格	2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulat
LTC1709-85	Linear	获取价格	2-Phase, 5-Bit VID,Current Mode, High Efficiency,Synchronous Step-Down Switching Regulator
LTC1709-85	ADI	获取价格	两相、5 位 VID、电流模式、高效率、同步降压型开关稳压器
LTC1709-9	Linear	获取价格	2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulat
LTC1709-9	ADI	获取价格	两相、5 位 VID、电流模式、高效率、同步降压型开关稳压器
LTC1709-9_15	Linear	获取价格	2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulat
LTC1709EG	Linear	获取价格	2-Phase, 5-Bit Adjustable, High Efficiency, Synchronous Step-Down Switching Regulator

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