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L4977A The ST L4977A is a monolithic power switching regulator designed for stepdown applications. It delivers up to 7A output current over a wide voltage range.
Mfr Part #:

L4977A

Available from 1 distributors
Mfr Name: STMicroelectronics
STMicroelectronics
The ST L4977A is a monolithic power switching regulator designed for stepdown applications. It delivers up to 7A output current over a wide voltage range.
✓ Total Stock: 2,276 pcs

L4977A Available from 1 distributor

✓ Authorised
✓ Non-Authorised
Distributor Stock Pricing MOQ PKG Lead Time Date Code On Order Quantity On Order Delivery
Optech Co.,Limited ✓
Non-Authorised Inventory information
2,276 pcs
On Request
2276 pcs On Request 1 On Request On Request 2017 On Request On Request
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L4977A Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Lead Spacing
Lead Style
Output Current
Output Voltage
Power Dissipation
Thermal Resistance
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L4977A Description

Short technical summary and product information.

The ST L4977A is a high-efficiency, monolithic stepdown switching regulator capable of delivering up to 7A of output current. It supports an adjustable output voltage range from 5.1V to 40V, making it versatile for various power supply designs.

 

Key electrical features include internal current limiting, thermal shutdown protection, and a precise 5.1V ± 2% on-chip reference voltage. The device operates with a switching frequency up to 500KHz, enabling the use of smaller external filter components. It also incorporates features like soft start and undervoltage lockout for robust operation.

 

This regulator is housed in a 15-lead Multiwatt power package, suitable for through-hole mounting. Its design is optimized for high efficiency and fast switching times, utilizing BCD mixed technology with a DMOS output transistor. The L4977A is well-suited for microprocessor-based systems requiring reliable power management.

L4977A Quick Information

Product Type: Switching Regulator
Series: L4977
Canonical Name: L4977A 7A Switching Regulator
Subcategory: Switching Regulators

L4977A Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

L4977A Features

  • 7A output current capability.
  • Adjustable output voltage from 5.1V to 40V.
  • High switching frequency up to 500KHz.
  • Internal current limiting and thermal shutdown.
  • Robust operation with soft start and UVLO.

L4977A Applications

  • Powering industrial motor control circuits efficiently.
  • Providing stable voltage rails for automotive electronics.
  • Converting higher bus voltages to lower logic levels.
  • Supplying high current to heavy-duty peripheral loads.
  • Enabling compact DC-DC conversion in dense PCB layouts.

L4977A FAQs

7 frequently asked questions generated from this part’s specifications.
What is the adjustable output voltage range?

The output voltage is adjustable from 5.1V to 40V.

What is the maximum output current capability?

The regulator provides up to 7A of internally limited output current.

What is the operating input voltage range?

The device operates with an input voltage up to 50V, with an absolute maximum rating of 55V.

What package type does the L4977A use?

The component is housed in a Multiwatt15V package.

What is the maximum switching frequency?

The switching frequency operates up to 500kHz.

What is the duty cycle range?

The duty cycle is adjustable from 0% to 90%.

What is the thermal resistance from junction to case?

The maximum thermal resistance from junction to case is 1°C/W.

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