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  • The L4973 is a step down monolithic power switching regulator delivering 3.5A at fixed voltages of 3.3V or 5.1V and using a simple external divider output adjustable voltage up to 50V. Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical RDS(on) of 0.15Ω) to obtain very high efficiency and very fast switching times. Switching frequency up to 300KHz are 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 40V cover the majority of the today applications. Features of this new generation of DC-DC converter includes pulse by pulse current limit, hiccup mode for output short circuit protection, voltage feed forward regulation, soft start, input/output synchronization, protection against feedback loop disconnection, inhibit for zero current consumption and thermal shutdown. Packages available are in plastic dual in line, DIP- 18 (12+3+3) for standard assembly, and SO20 (12+4+4) for SMD assembly.

    主要特性

    • Inhibit for zero current consumption (100mA at VCC= 24V)
    • Input/output synchronization function
    • Thermal shutdown
    • Protection against feedback disconnection
    • Soft start function
    • Output over voltage protection
    • Internal current limiting (pulse by pulse and HICCUP mode)
    • Zero load current operation (min 1mA)
    • Up to 3.5A step down converter
    • 3.3V and 5.1V (±1%) fixed output, and adjustable outputs from: 0.5V to 50V (3.3 type)5.1V to 50V (5.1 type)
    • Operating input voltage from 8V to 55V
    • Voltage feed forward
    • Precise 5.1V (1.5%) reference voltage externally available
    • Frequency adjustable up to 300kHz

电路原理图

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L4973D3.3 SO-20 Tube
批量生产
1.811 10000 EAR99 MALAYSIA 查看供货情况

Distributor availability ofL4973D3.3

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DIGIKEY WORLDWIDE 1000 1 Order Now
RS COMPONENTS EUROPE 323 1 Order Now
MOUSER WORLDWIDE 1348 1 Order Now
Farnell Element14 EUROPE 127 1 Order Now

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代理商库存报告日期: 2019-09-24

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L4973D5.1-013TR SO-20 Tape And Reel
批量生产
1.861 10000 EAR99 MALAYSIA 查看供货情况

Distributor availability ofL4973D5.1-013TR

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地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 877 1 Order Now
ARROW AMERICA 2000 1000 Order Now
MOUSER WORLDWIDE 2034 1 Order Now
ANGLIA Live EUROPE 23145 1 Order Now

代理商库存报告日期: 2019-09-24

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DIGIKEY

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877

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1000

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2034

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23145

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1

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EUROPE Order Now

代理商库存报告日期: 2019-09-24

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L4973V3.3 PDIP 18 Tube
批量生产
1.693 10000 EAR99 MALAYSIA 查看供货情况

Distributor availability ofL4973V3.3

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 980 1 Order Now
ARROW EUROPE 1000 0 Order Now
MOUSER WORLDWIDE 800 1 Order Now

代理商库存报告日期: 2019-09-24

代理商名称

DIGIKEY

库存

980

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1

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库存

1000

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0

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库存

800

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代理商库存报告日期: 2019-09-24

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L4973D3.3-013TR SO-20 Tape And Reel
批量生产
1.811 10000 EAR99 MALAYSIA 查看供货情况

Distributor availability ofL4973D3.3-013TR

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 986 1 Order Now
AVNET AMERICA 3000 0 Order Now
FUTURE WORLDWIDE 2000 1000 Order Now
MOUSER WORLDWIDE 479 1 Order Now
RUTRONIK EUROPE 1000 1000 Order Now

代理商库存报告日期: 2019-09-24

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DIGIKEY

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986

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1

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3000

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1000

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479

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1000

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1000

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代理商库存报告日期: 2019-09-24

立即购买
L4973D5.1 SO-20 Tube
批量生产
1.861 10000 EAR99 MALAYSIA 查看供货情况

Distributor availability ofL4973D5.1

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地区 库存 最小订购量 Third party link
RS COMPONENTS EUROPE 26 1 Order Now
ARROW EUROPE 37 0 Order Now
MOUSER WORLDWIDE 934 1 Order Now
ANGLIA Live EUROPE 307 1 Order Now

代理商库存报告日期: 2019-09-24

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RS COMPONENTS

库存

26

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1

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EUROPE Order Now

ARROW

库存

37

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0

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MOUSER

库存

934

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1

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ANGLIA Live

库存

307

Min.Order

1

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EUROPE Order Now

代理商库存报告日期: 2019-09-24

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L4973V5.1 PDIP 18 Tube
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1.778 10000 EAR99 MALAYSIA 查看供货情况

Distributor availability ofL4973V5.1

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地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 1000 1 Order Now
RS COMPONENTS EUROPE 413 1 Order Now
ARROW EUROPE 120 0 Order Now
MOUSER WORLDWIDE 428 1 Order Now
Farnell Element14 EUROPE 417 1 Order Now
ANGLIA Live EUROPE 1600 20 Order Now

代理商库存报告日期: 2019-09-24

代理商名称

DIGIKEY

库存

1000

Min.Order

1

地区

WORLDWIDE Order Now

RS COMPONENTS

库存

413

Min.Order

1

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EUROPE Order Now

ARROW

库存

120

Min.Order

0

地区

EUROPE Order Now

MOUSER

库存

428

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

417

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1

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EUROPE Order Now

ANGLIA Live

库存

1600

Min.Order

20

地区

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代理商库存报告日期: 2019-09-24

获取样片

L4973D3.3

封装

SO-20

包装类型

Tube

单价(US$)

1.811*

Distributor availability ofL4973D3.3

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 1000 1 Order Now
RS COMPONENTS EUROPE 323 1 Order Now
MOUSER WORLDWIDE 1348 1 Order Now
Farnell Element14 EUROPE 127 1 Order Now

代理商库存报告日期: 2019-09-24

代理商名称

DIGIKEY

库存

1000

Min.Order

1

地区

WORLDWIDE Order Now

RS COMPONENTS

库存

323

Min.Order

1

地区

EUROPE Order Now

MOUSER

库存

1348

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

127

Min.Order

1

地区

EUROPE Order Now

代理商库存报告日期: 2019-09-24

供货状态

批量生产

单价(US$)

1.811

数量

10000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

L4973D5.1-013TR

封装

SO-20

包装类型

Tape And Reel

单价(US$)

1.861*

Distributor availability ofL4973D5.1-013TR

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 877 1 Order Now
ARROW AMERICA 2000 1000 Order Now
MOUSER WORLDWIDE 2034 1 Order Now
ANGLIA Live EUROPE 23145 1 Order Now

代理商库存报告日期: 2019-09-24

代理商名称

DIGIKEY

库存

877

Min.Order

1

地区

WORLDWIDE Order Now

ARROW

库存

2000

Min.Order

1000

地区

AMERICA Order Now

MOUSER

库存

2034

Min.Order

1

地区

WORLDWIDE Order Now

ANGLIA Live

库存

23145

Min.Order

1

地区

EUROPE Order Now

代理商库存报告日期: 2019-09-24

供货状态

批量生产

单价(US$)

1.861

数量

10000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

L4973V3.3

封装

PDIP 18

包装类型

Tube

单价(US$)

1.693*

Distributor availability ofL4973V3.3

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 980 1 Order Now
ARROW EUROPE 1000 0 Order Now
MOUSER WORLDWIDE 800 1 Order Now

代理商库存报告日期: 2019-09-24

代理商名称

DIGIKEY

库存

980

Min.Order

1

地区

WORLDWIDE Order Now

ARROW

库存

1000

Min.Order

0

地区

EUROPE Order Now

MOUSER

库存

800

Min.Order

1

地区

WORLDWIDE Order Now

代理商库存报告日期: 2019-09-24

供货状态

批量生产

单价(US$)

1.693

数量

10000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

L4973D3.3-013TR

封装

SO-20

包装类型

Tape And Reel

单价(US$)

1.811*

Distributor availability ofL4973D3.3-013TR

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 986 1 Order Now
AVNET AMERICA 3000 0 Order Now
FUTURE WORLDWIDE 2000 1000 Order Now
MOUSER WORLDWIDE 479 1 Order Now
RUTRONIK EUROPE 1000 1000 Order Now

代理商库存报告日期: 2019-09-24

代理商名称

DIGIKEY

库存

986

Min.Order

1

地区

WORLDWIDE Order Now

AVNET

库存

3000

Min.Order

0

地区

AMERICA Order Now

FUTURE

库存

2000

Min.Order

1000

地区

WORLDWIDE Order Now

MOUSER

库存

479

Min.Order

1

地区

WORLDWIDE Order Now

RUTRONIK

库存

1000

Min.Order

1000

地区

EUROPE Order Now

代理商库存报告日期: 2019-09-24

供货状态

批量生产

单价(US$)

1.811

数量

10000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

L4973D5.1

封装

SO-20

包装类型

Tube

单价(US$)

1.861*

Distributor availability ofL4973D5.1

代理商名称
地区 库存 最小订购量 Third party link
RS COMPONENTS EUROPE 26 1 Order Now
ARROW EUROPE 37 0 Order Now
MOUSER WORLDWIDE 934 1 Order Now
ANGLIA Live EUROPE 307 1 Order Now

代理商库存报告日期: 2019-09-24

代理商名称

RS COMPONENTS

库存

26

Min.Order

1

地区

EUROPE Order Now

ARROW

库存

37

Min.Order

0

地区

EUROPE Order Now

MOUSER

库存

934

Min.Order

1

地区

WORLDWIDE Order Now

ANGLIA Live

库存

307

Min.Order

1

地区

EUROPE Order Now

代理商库存报告日期: 2019-09-24

供货状态

批量生产

单价(US$)

1.861

数量

10000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

L4973V5.1

封装

PDIP 18

包装类型

Tube

单价(US$)

1.778*

Distributor availability ofL4973V5.1

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 1000 1 Order Now
RS COMPONENTS EUROPE 413 1 Order Now
ARROW EUROPE 120 0 Order Now
MOUSER WORLDWIDE 428 1 Order Now
Farnell Element14 EUROPE 417 1 Order Now
ANGLIA Live EUROPE 1600 20 Order Now

代理商库存报告日期: 2019-09-24

代理商名称

DIGIKEY

库存

1000

Min.Order

1

地区

WORLDWIDE Order Now

RS COMPONENTS

库存

413

Min.Order

1

地区

EUROPE Order Now

ARROW

库存

120

Min.Order

0

地区

EUROPE Order Now

MOUSER

库存

428

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

417

Min.Order

1

地区

EUROPE Order Now

ANGLIA Live

库存

1600

Min.Order

20

地区

EUROPE Order Now

代理商库存报告日期: 2019-09-24

供货状态

批量生产

单价(US$)

1.778

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**
L4973D3.3
批量生产
SO-20 工业 Ecopack2
L4973D3.3-013TR
批量生产
SO-20 工业 Ecopack2
L4973D5.1
批量生产
SO-20 工业 Ecopack2
L4973D5.1-013TR
批量生产
SO-20 工业 Ecopack2
L4973V3.3
批量生产
PDIP 18 工业 Ecopack1
L4973V5.1
批量生产
PDIP 18 工业 Ecopack1

L4973D3.3

Package:

SO-20

Material Declaration**:

PDF XML

Marketing Status

批量生产

Package

SO-20

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L4973D3.3-013TR

Package:

SO-20

Material Declaration**:

PDF XML

Marketing Status

批量生产

Package

SO-20

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L4973D5.1

Package:

SO-20

Material Declaration**:

PDF XML

Marketing Status

批量生产

Package

SO-20

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L4973D5.1-013TR

Package:

SO-20

Material Declaration**:

PDF XML

Marketing Status

批量生产

Package

SO-20

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L4973V3.3

Package:

PDIP 18

Material Declaration**:

PDF XML

Marketing Status

批量生产

Package

PDIP 18

Grade

Industrial

RoHS Compliance Grade

Ecopack1

L4973V5.1

Package:

PDIP 18

Material Declaration**:

PDF XML

Marketing Status

批量生产

Package

PDIP 18

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.

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