L7981

Description：IC REG BUCK ADJ 3A 8VFQFPN
Series：-
Mfr：STMicroelectronics
Package：Tube

SKU:9ab8fb1a3bf9 Category: Voltage Regulators - DC DC Switching Regulators Brand: STMicroelectronics

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Product introduction

L7981 is listed in the Voltage Regulators - DC DC Switching Regulators range at ChipApex. The manufacturer field lists STMicroelectronics. Its product description is IC REG BUCK ADJ 3A 8VFQFPN. Review the specifications below when checking this part for your BOM.

Voltage Regulators - DC DC Switching Regulators specifications for L7981

Description：IC REG BUCK ADJ 3A 8VFQFPN
Series：-
Mfr：STMicroelectronics
Package：Tube
Function：Step-Down
Output Configuration：Positive
Topology：Buck
Output Type：Adjustable
Number of Outputs：1
Voltage - Input (Min)：4.5V
Voltage - Input (Max)：28V
Voltage - Output (Min/Fixed)：0.6V
Voltage - Output (Max)：28V
Current - Output：3A
Frequency - Switching：250kHz ~ 1MHz
Synchronous Rectifier：No
Operating Temperature：-40°C ~ 150°C (TJ)
Mounting Type：Surface Mount
Package / Case：8-VFDFN Exposed Pad
Supplier Device Package：8-VFQFPN (3x3)
Grade：-
Qualification：-

Voltage Regulators - DC DC Switching Regulators datasheet and documents for L7981

L7981

Voltage Regulators - DC DC Switching Regulators Overview

The L7981 is a synchronous step-down switching regulator from STMicroelectronics, featuring an embedded power MOSFET with a minimum current limit of 3.7 A to deliver up to 3 A output current. It operates with an input voltage range of 4.5 V to 28 V and provides an adjustable output voltage from 0.6 V to the input voltage. The device includes an internal 250 kHz oscillator that can be externally programmed up to 1 MHz. Available in VFQFPN 3x3-8L and HSOP8 packages, it supports industrial temperatures from -40°C to +150°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

Integrated 3.7 A current-limited power MOSFET for high-efficiency buck conversion
Internal 250 kHz oscillator with external programmability up to 1 MHz
Low dropout operation enabling 100% duty cycle performance
Built-in overcurrent and thermal protection mechanisms

Voltage Regulators - DC DC Switching Regulators Applications

Industrial bus-powered systems
HVAC power supplies
Battery-powered equipment
Decentralized intelligent nodes

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific package variant (VFQFPN or HSOP8) and tape/reel specifications against the official datasheet before ordering. Confirm RoHS compliance status and ensure the selected part number matches the required operating temperature range for the intended application environment.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a compact solution is needed for converting wide input voltages down to low output levels. The integrated MOSFET reduces external component count, while the programmable frequency allows optimization for size or efficiency. Ensure the load current requirements do not exceed the 3 A continuous limit under worst-case thermal conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

The L7981 belongs to STMicroelectronics' portfolio of monolithic buck converters designed for automotive and industrial applications. It complements other regulators like the L7980 and L6981 series, offering higher current capacity and wider input voltage tolerance suitable for robust power management in demanding environments.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The STEVAL-ISA093V1 is a demonstration board based on the L7981, not a direct replacement. No public confirmed substitute part numbers are available in the provided documentation.

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Return and Refund

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