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  • The L4977A is a stepdown monolithic power switching regulator delivering 7A 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 L4977A include reset and power fail for microprocessors, feed forward line regulation, soft start, limiting current and thermal protection. The device is mounted in a 15-lead multiwatt plastic power package and requires few external components. Efficient operation at switching frequencies up to 500KHz allows reduction in the size and cost of external filter components.

    主要特性

    • UNDER VOLTAGE LOCK OUT WITH HYSTERETIC TURN-ON
    • INPUT/OUTPUT SYNC PIN
    • VERY HIGH EFFICIENCY
    • PWM LATCH FOR SINGLE PULSE PER PERIOD
    • THERMAL SHUTDOWN
    • SWITCHING FREQUENCY UP TO 500KHz
    • CONTINUOUS MODE OPERATION
    • RESET AND POWER FAIL FUNCTIONS
    • PRECISE 5.1V ± 2% ON CHIP REFERENCE
    • 7A OUTPUT CURRENT
    • 0 TO 90% DUTY CYCLE RANGE
    • 5.1V TO 40V OUTPUT VOLTAGE RANGE
    • INTERNAL CURRENT LIMITING
    • SOFT START
    • INTERNAL FEED-FORWARD LINE REGULATION

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)
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从分销商订购
从ST订购
L4977A MW 15L Tube
批量生产
7.094 10000 EAR99 MOROCCO 查看供货情况

Distributor availability ofL4977A

代理商名称
地区 库存 最小订购量 Third party link
RS COMPONENTS EUROPE 399 1 Order Now
ARROW EUROPE 22 0 Order Now
ARROW AMERICA 491 500 Order Now
MOUSER WORLDWIDE 354 1 Order Now

代理商库存报告日期: 2019-12-08

代理商名称

RS COMPONENTS

库存

399

Min.Order

1

地区

EUROPE Order Now

ARROW

库存

22

Min.Order

0

地区

EUROPE Order Now

ARROW

库存

491

Min.Order

500

地区

AMERICA Order Now

MOUSER

库存

354

Min.Order

1

地区

WORLDWIDE Order Now

代理商库存报告日期: 2019-12-08

立即购买

L4977A

封装

MW 15L

包装类型

Tube

单价(US$)

7.094*

Distributor availability ofL4977A

代理商名称
地区 库存 最小订购量 Third party link
RS COMPONENTS EUROPE 399 1 Order Now
ARROW EUROPE 22 0 Order Now
ARROW AMERICA 491 500 Order Now
MOUSER WORLDWIDE 354 1 Order Now

代理商库存报告日期: 2019-12-08

代理商名称

RS COMPONENTS

库存

399

Min.Order

1

地区

EUROPE Order Now

ARROW

库存

22

Min.Order

0

地区

EUROPE Order Now

ARROW

库存

491

Min.Order

500

地区

AMERICA Order Now

MOUSER

库存

354

Min.Order

1

地区

WORLDWIDE Order Now

代理商库存报告日期: 2019-12-08

供货状态

批量生产

单价(US$)

7.094

数量

10000

ECCN (US)

EAR99

Country of Origin

MOROCCO

(*) 建议转售单价(美元)仅用于预算用途。如需以当地货币计价的报价,请联系您当地的 ST销售办事处 或我们的 经销商

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产品型号 供货状态 封装 等级规格 符合RoHS级别 Material Declaration**
L4977A
批量生产
MW 15L 工业 Ecopack1

L4977A

Package:

MW 15L

Material Declaration**:

Marketing Status

批量生产

Package

MW 15L

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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