LM3478

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2.97V~40V 宽输入范围升压/SEPIC/反激式直流/直流控制器

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数据表

LM3478

正在供货

数据表

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产品详细信息

Vin (Min) (V)

2.97

Vin (Max) (V)

40

Vout (Min) (V)

1.26

Vout (Max) (V)

500

Regulated outputs (#)

1

Switching frequency (Min) (kHz)

100

Switching frequency (Max) (kHz)

1000

Iq (Typ) (mA)

2.7

Features

Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Pre-Bias Start-Up

Duty cycle (Max) (%)

100

Rating

Catalog

Operating temperature range (C)

-40 to 125

Vin (Min) (V)

2.97

Vin (Max) (V)

40

Vout (Min) (V)

1.26

Vout (Max) (V)

500

Regulated outputs (#)

1

Switching frequency (Min) (kHz)

100

Switching frequency (Max) (kHz)

1000

Iq (Typ) (mA)

2.7

Features

Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Pre-Bias Start-Up

Duty cycle (Max) (%)

100

Rating

Catalog

Operating temperature range (C)

-40 to 125

SOIC (D)

8

19 mm² 4.9 x 3.9

VSSOP (DGK)

8

15 mm² 3 x 4.9

8-lead VSSOP-8 and SOIC-8 packages
Internal Push-Pull Driver With 1-A Peak Current Capability
Current Limit and Thermal Shutdown
Frequency Compensation Optimized With a Capacitor and a Resistor
Internal Soft Start
Current Mode Operation
Undervoltage Lockout With Hysteresis
Create a Custom Design Using the LM3478 with the WEBENCH Power Designer

8-lead VSSOP-8 and SOIC-8 packages
Internal Push-Pull Driver With 1-A Peak Current Capability
Current Limit and Thermal Shutdown
Frequency Compensation Optimized With a Capacitor and a Resistor
Internal Soft Start
Current Mode Operation
Undervoltage Lockout With Hysteresis
Create a Custom Design Using the LM3478 with the WEBENCH Power Designer

The LM3478 is a versatile Low-Side N-Channel MOSFET controller for switching regulators. It is suitable for use in topologies requiring a low side MOSFET, such as boost, flyback, SEPIC, etc. Moreover, the LM3478 can be operated at extremely high switching frequency in order to reduce the overall solution size. The switching frequency of the LM3478 can be adjusted to any value between 100 kHz and 1 MHz by using a single external resistor. Current mode control provides superior bandwidth and transient response, besides cycle-by-cycle current limiting. Output current can be programmed with a single external resistor.

The LM3478 has built-in features such as thermal shutdown, short-circuit protection, over voltage protection, etc. Power saving shutdown mode reduces the total supply current to 5 µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up.

The LM3478 is a versatile Low-Side N-Channel MOSFET controller for switching regulators. It is suitable for use in topologies requiring a low side MOSFET, such as boost, flyback, SEPIC, etc. Moreover, the LM3478 can be operated at extremely high switching frequency in order to reduce the overall solution size. The switching frequency of the LM3478 can be adjusted to any value between 100 kHz and 1 MHz by using a single external resistor. Current mode control provides superior bandwidth and transient response, besides cycle-by-cycle current limiting. Output current can be programmed with a single external resistor.

The LM3478 has built-in features such as thermal shutdown, short-circuit protection, over voltage protection, etc. Power saving shutdown mode reduces the total supply current to 5 µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up.

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LM5156H

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	类型	项目标题		日期
*	数据表	LM3478 High-Efficiency Low-Side N-Channel Controller for Switching Regulator 数据表 (Rev. X)	PDF \| HTML	28 Feb 2017
	应用手册	LM34xx How to Design Flyback Converter with LM3481 Boost Controller (Rev. A)		08 Apr 2019
	技术文章	How to add overvoltage protection to a synchronous boost controller		17 Sep 2018
	选择指南	电源管理指南 2018 (Rev. K)		31 Jul 2018
	选择指南	电源管理指南 2018 (Rev. R)		25 Jun 2018
	应用手册	Softstart Using Constant Current Constant Voltage Approach		24 Jul 2015
	技术文章	Portable speaker power: Making the bass possible		12 May 2015
	应用手册	Demystifying Type II and Type III Compensators Using Op-Amp and OTA for DC/DC Co		11 Jul 2014
	应用手册	小功率便携式音频产品(含Charger 和DC-DC)的辐射发射超标对策		07 Jan 2014
	用户指南	AN-1204 LM3478/LM3488 Evaluation Board (Rev. A)		30 Oct 2013
	应用手册	AN-1286 Compensation For The LM3478 Boost Controller (Rev. C)		23 Apr 2013
	应用手册	AN-1484 Designing A SEPIC Converter (Rev. E)		23 Apr 2013
	应用手册	AN-1990 Compensation for Current Mode Control SEPIC Converters (Rev. A)		23 Apr 2013
	应用手册	Modeling & Design of Current Mode Control Boost Converters (Rev. B)		23 Apr 2013
	更多文献资料	Die D/S LM3478 MDC Hi Efficiency Low-Side N-Chan Controller For Switching Reg		25 Sep 2012
	应用手册	Application Note 1286 Compensation For The LM3478 Boost Controller (cn)		19 May 2009
	应用手册	Application Note 1484 Designing A SEPIC Converter (cn)		30 Apr 2008

设计和开发

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High Efficiency Low-Side N-Channel Controller for Switching Regulator

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