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  • The L7981 device is a step-down switching regulator with a 3.7 A (minimum) current limited embedded Power MOSFET, so it is able to deliver up to 3 A current to the load depending on the application conditions.

    The input voltage can range from 4.5 V to 28 V, while the output voltage can be set starting from 0.6 V to VIN.
    Requiring a minimum set of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz.
    The QFN and the HSOP packages with exposed pad allow reducing the RthJAdown to 60°C/W and 40°C/W respectively.

    主要特性

    • 3 A DC output current
    • 4.5 V to 28 V input voltage
    • Output voltage adjustable from 0.6 V
    • 250 kHz switching frequency, programmable up to 1 MHz
    • Internal soft-start and enable
    • Low dropout operation: 100% duty cycle
    • Voltage feed-forward
    • Zero load current operation
    • Overcurrent and thermal protection
    • VFQFPN 3 x 3 - 8L and HSOP8 package

电路原理图

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样片和购买

产品型号
封装
包装类型
供货状态
预算价格(US$)
数量
ECCN (US)
Country of Origin
从分销商订购
从ST订购
L7981A PowerSO-8 Tube
Active
0.746 10000 EAR99 CHINA 查看供货情况

Distributor availability ofL7981A

代理商名称
地区 库存 最小订购量 Third party link
MOUSER WORLDWIDE 1352 1 Order Now
Farnell Element14 EUROPE 228 1 Order Now

代理商库存报告日期: 2019-08-23

代理商名称

MOUSER

库存

1352

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

228

Min.Order

1

地区

EUROPE Order Now

代理商库存报告日期: 2019-08-23

立即购买
L7981TR DFN8 3x3 Tape And Reel
Active
0.719 10000 EAR99 PHILIPPINES 查看供货情况

Distributor availability ofL7981TR

代理商名称
地区 库存 最小订购量 Third party link
Newark Element14 AMERICA 2740 0 Order Now
ARROW AMERICA 4000 4000 Order Now
MOUSER WORLDWIDE 3637 1 Order Now
Farnell Element14 EUROPE 4990 1 Order Now

代理商库存报告日期: 2019-08-23

代理商名称

Newark Element14

库存

2740

Min.Order

0

地区

AMERICA Order Now

ARROW

库存

4000

Min.Order

4000

地区

AMERICA Order Now

MOUSER

库存

3637

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

4990

Min.Order

1

地区

EUROPE Order Now

代理商库存报告日期: 2019-08-23

Get sample
L7981ATR PowerSO-8 Tape And Reel
Active
0.746 10000 EAR99 CHINA 查看供货情况

Distributor availability ofL7981ATR

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 15000 1 Order Now
FUTURE WORLDWIDE 2500 2500 Order Now
Newark Element14 AMERICA 261 0 Order Now
MOUSER WORLDWIDE 9000 1 Order Now
Farnell Element14 EUROPE 197 1 Order Now

代理商库存报告日期: 2019-08-23

代理商名称

DIGIKEY

库存

15000

Min.Order

1

地区

WORLDWIDE Order Now

FUTURE

库存

2500

Min.Order

2500

地区

WORLDWIDE Order Now

Newark Element14

库存

261

Min.Order

0

地区

AMERICA Order Now

MOUSER

库存

9000

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

197

Min.Order

1

地区

EUROPE Order Now

代理商库存报告日期: 2019-08-23

Get sample

L7981A

封装

PowerSO-8

包装类型

Tube

Unit Price (US$)

0.746*

Distributor availability ofL7981A

代理商名称
地区 库存 最小订购量 Third party link
MOUSER WORLDWIDE 1352 1 Order Now
Farnell Element14 EUROPE 228 1 Order Now

代理商库存报告日期: 2019-08-23

代理商名称

MOUSER

库存

1352

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

228

Min.Order

1

地区

EUROPE Order Now

代理商库存报告日期: 2019-08-23

供货状态

Active

Unit Price (US$)

0.746

数量

10000

ECCN (US)

EAR99

Country of Origin

CHINA

L7981TR

封装

DFN8 3x3

包装类型

Tape And Reel

Unit Price (US$)

0.719*

Distributor availability ofL7981TR

代理商名称
地区 库存 最小订购量 Third party link
Newark Element14 AMERICA 2740 0 Order Now
ARROW AMERICA 4000 4000 Order Now
MOUSER WORLDWIDE 3637 1 Order Now
Farnell Element14 EUROPE 4990 1 Order Now

代理商库存报告日期: 2019-08-23

代理商名称

Newark Element14

库存

2740

Min.Order

0

地区

AMERICA Order Now

ARROW

库存

4000

Min.Order

4000

地区

AMERICA Order Now

MOUSER

库存

3637

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

4990

Min.Order

1

地区

EUROPE Order Now

代理商库存报告日期: 2019-08-23

供货状态

Active

Unit Price (US$)

0.719

数量

10000

ECCN (US)

EAR99

Country of Origin

PHILIPPINES

L7981ATR

封装

PowerSO-8

包装类型

Tape And Reel

Unit Price (US$)

0.746*

Distributor availability ofL7981ATR

代理商名称
地区 库存 最小订购量 Third party link
DIGIKEY WORLDWIDE 15000 1 Order Now
FUTURE WORLDWIDE 2500 2500 Order Now
Newark Element14 AMERICA 261 0 Order Now
MOUSER WORLDWIDE 9000 1 Order Now
Farnell Element14 EUROPE 197 1 Order Now

代理商库存报告日期: 2019-08-23

代理商名称

DIGIKEY

库存

15000

Min.Order

1

地区

WORLDWIDE Order Now

FUTURE

库存

2500

Min.Order

2500

地区

WORLDWIDE Order Now

Newark Element14

库存

261

Min.Order

0

地区

AMERICA Order Now

MOUSER

库存

9000

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

197

Min.Order

1

地区

EUROPE Order Now

代理商库存报告日期: 2019-08-23

供货状态

Active

Unit Price (US$)

0.746

数量

10000

ECCN (US)

EAR99

Country of Origin

CHINA

(*) 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**
L7981A
Active
PowerSO-8 工业 Ecopack2
L7981ATR
Active
PowerSO-8 工业 Ecopack2
L7981TR
Active
DFN8 3x3 工业 Ecopack2

L7981A

Package:

PowerSO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PowerSO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L7981ATR

Package:

PowerSO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PowerSO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L7981TR

Package:

DFN8 3x3

Material Declaration**:

Marketing Status

Active

Package

DFN8 3x3

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) 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.

eDesignSuite

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Input

V This option is required. And must be less than or equal to Volt. Max [V]
V This option is required. And must be greater than or equal to Volt. Min [V]

Output Power

V This option is required and must be a number.
A This option is required and must be a number.