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  • The L4978 is a step down monolithic power switching regulator delivering 2A at a voltage between 3.3V and 50V (selected by a simple external divider). Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical Rdson of 0.25Ω) to obtain very high efficency and high switching speed.

    A switching frequency up to 300KHz is achievable (the maximum power dissipation of the packages must be observed). A wide input voltage range between 8V to 55V and output voltages regulated from 3.3V to 50V cover the majority of today’s applications. Features of this new generations of DC-DC converter include pulse-by-pulse current limit, hiccup mode for short circuit protection, voltage feedforward regulation, soft-start, protection against feedback loop disconnection, inhibit for zero current consumption and thermal shutdown.
    The device is available in plastic dual in line, DIP-8 for standard assembly, and SO16W for SMD assembly.

    主要特性

    • PROTECTION AGAINST FEEDBACK DISCONNECTION
    • INHIBIT FOR ZERO CURRENT CONSUMPTION
    • SOFT START FUNCTION
    • THERMAL SHUTDOWN
    • ZERO LOAD CURRENT OPERATION
    • VOLTAGE FEEDFORWARD
    • UP TO 2A STEP DOWN CONVERTER
    • PRECISE 3.3V (±1%) INTERNAL REFERENCE VOLTAGE
    • OPERATING INPUT VOLTAGE FROM 8V TO 55V
    • SWITCHING FREQUENCY ADJUSTABLE UP TO 300KHz
    • INTERNAL CURRENT LIMITING (PULSE-BYPULSE AND HICCUP MODE)
    • OUTPUT VOLTAGE ADJUSTABLE FROM 3.3V TO 50V

电路原理图

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样片和购买

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L4978D013TR SO-16W Tape And Reel
Active
1.389 10000 EAR99 MALAYSIA 查看供货情况

Distributor availability ofL4978D013TR

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 2415 1 Order Now
MOUSER WORLDWIDE 4130 1 Order Now

代理商库存报告日期: 2019-09-13

代理商名称

DIGIKEY

库存

2415

Min.Order

1

地区

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MOUSER

库存

4130

Min.Order

1

地区

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代理商库存报告日期: 2019-09-13

Get sample
L4978 DIP-8 Tube
Active
1.389 10000 EAR99 MALAYSIA 查看供货情况

Distributor availability ofL4978

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 857 1 Order Now
FUTURE WORLDWIDE 595 1 Order Now
MOUSER WORLDWIDE 966 1 Order Now
Farnell Element14 EUROPE 1235 1 Order Now

代理商库存报告日期: 2019-09-13

代理商名称

DIGIKEY

库存

857

Min.Order

1

地区

WORLDWIDE Order Now

FUTURE

库存

595

Min.Order

1

地区

WORLDWIDE Order Now

MOUSER

库存

966

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

1235

Min.Order

1

地区

EUROPE Order Now

代理商库存报告日期: 2019-09-13

Get sample
L4978D SO-16W Tube
Active
1.389 10000 EAR99 MALAYSIA 查看供货情况

Distributor availability ofL4978D

代理商名称
地区 库存 最小订购量 Third party link
RS COMPONENTS EUROPE 848 1 Order Now
ARROW AMERICA 9 1225 Order Now
MOUSER WORLDWIDE 948 1 Order Now
Farnell Element14 EUROPE 1185 1 Order Now

代理商库存报告日期: 2019-09-13

代理商名称

RS COMPONENTS

库存

848

Min.Order

1

地区

EUROPE Order Now

ARROW

库存

9

Min.Order

1225

地区

AMERICA Order Now

MOUSER

库存

948

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

1185

Min.Order

1

地区

EUROPE Order Now

代理商库存报告日期: 2019-09-13

立即购买

L4978D013TR

封装

SO-16W

包装类型

Tape And Reel

Unit Price (US$)

1.389*

Distributor availability ofL4978D013TR

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 2415 1 Order Now
MOUSER WORLDWIDE 4130 1 Order Now

代理商库存报告日期: 2019-09-13

代理商名称

DIGIKEY

库存

2415

Min.Order

1

地区

WORLDWIDE Order Now

MOUSER

库存

4130

Min.Order

1

地区

WORLDWIDE Order Now

代理商库存报告日期: 2019-09-13

供货状态

Active

Unit Price (US$)

1.389

数量

10000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

L4978

封装

DIP-8

包装类型

Tube

Unit Price (US$)

1.389*

Distributor availability ofL4978

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 857 1 Order Now
FUTURE WORLDWIDE 595 1 Order Now
MOUSER WORLDWIDE 966 1 Order Now
Farnell Element14 EUROPE 1235 1 Order Now

代理商库存报告日期: 2019-09-13

代理商名称

DIGIKEY

库存

857

Min.Order

1

地区

WORLDWIDE Order Now

FUTURE

库存

595

Min.Order

1

地区

WORLDWIDE Order Now

MOUSER

库存

966

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

1235

Min.Order

1

地区

EUROPE Order Now

代理商库存报告日期: 2019-09-13

供货状态

Active

Unit Price (US$)

1.389

数量

10000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

L4978D

封装

SO-16W

包装类型

Tube

Unit Price (US$)

1.389*

Distributor availability ofL4978D

代理商名称
地区 库存 最小订购量 Third party link
RS COMPONENTS EUROPE 848 1 Order Now
ARROW AMERICA 9 1225 Order Now
MOUSER WORLDWIDE 948 1 Order Now
Farnell Element14 EUROPE 1185 1 Order Now

代理商库存报告日期: 2019-09-13

代理商名称

RS COMPONENTS

库存

848

Min.Order

1

地区

EUROPE Order Now

ARROW

库存

9

Min.Order

1225

地区

AMERICA Order Now

MOUSER

库存

948

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

1185

Min.Order

1

地区

EUROPE Order Now

代理商库存报告日期: 2019-09-13

供货状态

Active

Unit Price (US$)

1.389

数量

10000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

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产品型号 供货状态 封装 等级规格 符合RoHS级别 材料声明**
L4978
Active
DIP-8 工业 Ecopack2 (**)
L4978D
Active
SO-16W 工业 Ecopack1
L4978D013TR
Active
SO-16W 工业 Ecopack1

L4978

Package:

DIP-8

Material Declaration**:

Marketing Status

Active

Package

DIP-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2 (**)

L4978D

Package:

SO-16W

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-16W

Grade

Industrial

RoHS Compliance Grade

Ecopack1

L4978D013TR

Package:

SO-16W

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-16W

Grade

Industrial

RoHS Compliance Grade

Ecopack1

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.