LT3742

更新时间： 2024-09-16 05:43:35

品牌	Logo	应用领域
凌特 - Linear		开关控制器
页数	文件大小	规格书
24页	275K
描述
Dual, 2-Phase Step-Down Switching Controller

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中文翻译

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数据手册

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LT3742 数据手册

LT3742

Dual, 2-Phase Step-Down

Switching Controller

FEATURES

DESCRIPTION

TheLT^®3742isadualstep-downDC/DCswitchingregulator

controllerthatdriveshighsideN-channelpowerMOSFETs.

A 500kHz ﬁxed frequency current mode architecture pro-

vides fast transient response with simple loop compensa-

tion components and cycle-by-cycle current limiting. The

output stages of the two controllers operate 180° out of

phase to reduce the input ripple current, minimizing the

noise induced on the input supply, and allowing less input

capacitance.

■

Wide Input Voltage Range: 4V to 30V

■

Wide Output Voltage Range: 0.8V to V

■

Low Shutdown I : 20μA

■

Out-of-Phase Controllers Reduce Required Input

Capacitance and Power Supply Induced Noise

0.8V 1.5% Voltage Reference

■

500kHz Current Mode Fixed Frequency Operation

Internal Boost Converter Provides Bias Rail for

N-Channel MOSFET Gate Drive

Power Good Voltage Monitor for Each Output

Programmable Soft-Start

24-Lead 4mm × 4mm × 0.75mm Package

■

AninternalboostregulatorgeneratesabiasrailofV +7V

to provide gate drive for the N-channel MOSFETs allowing

low dropout and 100% duty cycle operation. The LT3742

can be used for applications where both controllers need

to operate independently, or where both controllers are

used to provide a single higher current output.

APPLICATIONS

■

Satellite and Cable TV Set-Top Boxes

■

Distributed Power Regulation

The device is available in a thermally enhanced 4mm ×

4mm QFN package.

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

All other trademarks are the property of their respective owners.

■

Automotive Systems

Super Capacitor Charger

■

TYPICAL APPLICATION

8V and 5V Dual Step-Down Converter

10μH

14V

4.7μF

45.3k

20.0k

Efﬁciency vs Load Current

SWB BIAS

UVLO

1μF

100

OUT

LT3742

OUT

10μF

6.5μH

0.010Ω

OUT1

OUT2

SW1

SW2

–

SENSE1

FB1

SENSE2

1.8k

1.05k

–

FB2

47μF

200Ω

PG1

PG2

2.5

LOAD CURRENT (A)

0.5

1.5

3.5

RUN/SS1

RUN/SS2

30k

20k

RUN1

3742 TA03b

RUN2

GND

1nF

1000pF

1nF 1000pF

3742 TA03a

3742f

12 3 4 5 6 7...24

中文翻译

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与LT3742相关器件

型号	品牌	获取价格	描述	数据表
LT3742_1	Linear	获取价格	Dual, 2-Phase Step-Down Switching Controller Programmable Soft-Start
LT3742EUF#PBF	Linear	获取价格	LT3742 - Dual, 2-Phase Step-Down Switching Controller; Package: QFN; Pins: 24; Temperature
LT3742EUF#TRPBF	Linear	获取价格	LT3742 - Dual, 2-Phase Step-Down Switching Controller; Package: QFN; Pins: 24; Temperature
LT3742EUF-PBF	Linear	获取价格	Dual, 2-Phase Step-Down Switching Controller
LT3742EUF-TRPBF	Linear	获取价格	Dual, 2-Phase Step-Down Switching Controller
LT3743	Linear	获取价格	High Current Synchronous Step-Down LED Driver with Three-State Control
LT3743	ADI	获取价格	具三态控制功能的高电流、同步降压型 LED 驱动器
LT3743_10	Linear	获取价格	High Current Synchronous Step-Down LED Driver with Three-State Control
LT3743EFE#PBF	Linear	获取价格	LT3743 - High Current Synchronous Step-Down LED Driver with Three-State Control; Package:
LT3743EFE#TRPBF	Linear	获取价格	LT3743 - High Current Synchronous Step-Down LED Driver with Three-State Control; Package:

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