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  • The L4974A is a stepdown monolithic power switching regulator delivering 3.5A at a voltage variable from 5.1 to 40V.

    Realized with BCD mixed technology, the device uses a DMOS output transistor to obtain very high efficiency and very fast switching times. Features of the L4974A include reset and power fail for microprocessors, feed forward line regulation, soft start, limiting current and thermal protection. The device is mounted in a Powerdip 16 + 2 + 2 plastic package and requires few external components. Efficient operation at switching frequencies up to 200KHz allows reduction in the size and cost of external filter component.

    主要特性

    • PWM LATCH FOR SINGLE PULSE PER PERIOD
    • UNDER VOLTAGE LOCK OUT WITH HYSTERETIC TURN-ON
    • SWITCHING FREQUENCY UP TO 200KHz
    • VERY HIGH EFFICIENCY
    • CONTINUOUS MODE OPERATION
    • THERMAL SHUTDOWN
    • RESET AND POWER FAIL FUNCTIONS
    • PRECISE 5.1V ± 2% ON CHIP REFERENCE
    • 3.5A OUTPUT CURRENT
    • 0 TO 90% DUTY CYCLE RANGE
    • 5.1V TO 40V OUTPUT VOLTAGE RANGE
    • INTERNAL CURRENT LIMITING
    • INPUT/OUTPUT SYNC PIN
    • INTERNAL FEED-FORWARD LINE REG.

电路原理图

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样片和购买

产品型号
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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
L4974A PDIP 20 Tube
Active
5.108 10000 EAR99 MALAYSIA 查看供货情况

Distributor availability ofL4974A

代理商名称
地区 库存 最小订购量 Third party link
RS COMPONENTS EUROPE 233 1 Order Now
ARROW EUROPE 260 0 Order Now
MOUSER WORLDWIDE 467 1 Order Now
Farnell Element14 EUROPE 220 1 Order Now
ANGLIA Live EUROPE 10 1 Order Now
RUTRONIK EUROPE 1680 20 Order Now

代理商库存报告日期: 2019-09-20

代理商名称

RS COMPONENTS

库存

233

Min.Order

1

地区

EUROPE Order Now

ARROW

库存

260

Min.Order

0

地区

EUROPE Order Now

MOUSER

库存

467

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

220

Min.Order

1

地区

EUROPE Order Now

ANGLIA Live

库存

10

Min.Order

1

地区

EUROPE Order Now

RUTRONIK

库存

1680

Min.Order

20

地区

EUROPE Order Now

代理商库存报告日期: 2019-09-20

Get sample

L4974A

封装

PDIP 20

包装类型

Tube

Unit Price (US$)

5.108*

Distributor availability ofL4974A

代理商名称
地区 库存 最小订购量 Third party link
RS COMPONENTS EUROPE 233 1 Order Now
ARROW EUROPE 260 0 Order Now
MOUSER WORLDWIDE 467 1 Order Now
Farnell Element14 EUROPE 220 1 Order Now
ANGLIA Live EUROPE 10 1 Order Now
RUTRONIK EUROPE 1680 20 Order Now

代理商库存报告日期: 2019-09-20

代理商名称

RS COMPONENTS

库存

233

Min.Order

1

地区

EUROPE Order Now

ARROW

库存

260

Min.Order

0

地区

EUROPE Order Now

MOUSER

库存

467

Min.Order

1

地区

WORLDWIDE Order Now

Farnell Element14

库存

220

Min.Order

1

地区

EUROPE Order Now

ANGLIA Live

库存

10

Min.Order

1

地区

EUROPE Order Now

RUTRONIK

库存

1680

Min.Order

20

地区

EUROPE Order Now

代理商库存报告日期: 2019-09-20

供货状态

Active

Unit Price (US$)

5.108

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**
L4974A
Active
PDIP 20 工业 Ecopack1

L4974A

Package:

PDIP 20

Material Declaration**:

Marketing Status

Active

Package

PDIP 20

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.