Product overview
Description
The L6981 is an easy to use synchronous monolithic step-down regulator capable of delivering up to 1.5 A DC to the load. The wide input voltage range makes the device suitable for a broad range of applications. The L6981 is based on a peak current mode architecture and is packaged in an SO8 with internal compensation, thus minimizing design complexity and size.
The L6981 is available both in low consumption mode (LCM) and low noise mode (LNM) versions. LCM maximizes the efficiency at light-load with controlled output voltage ripple so the device is suitable for battery-powered applications.
LNM makes the switching frequency constant and minimizes the output voltage ripple for light-load operations, meeting the specification for low noise sensitive applications.
The EN pin provides output enable/disable functionality. The typical shutdown current is 2 µA when disabled. As soon as the EN pin is pulled up the device is enabled and the internal 1.3 ms soft-start takes place. Pulse-by-pulse current sensing on both power elements implements an effective constant current protection and thermal shutdown prevents thermal run-away.
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All features
- 3.5 V to 38 V operating input voltage
- Output voltage from 0.85 V to VIN
- 3.3 / 5 V fixed output voltage versions
- 1.5 A DC output current
- 20 μA operating quiescent current
- Internal compensation network
- Two different versions: LCM for high efficiency at light-loads and LNM for noise sensitive applications
- 2 μA shutdown current
- Internal soft-start
- High voltage VIN compatible Enable
- Output overvoltage protection
- Output voltage sequencing
- Thermal protection
- Synchronization to external clock for LNM devices
- SO8 package
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All resources
| Resource title | Version | Latest update |
|---|
Product Specifications (1)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| 3.0 | 21 Dec 2022 | 21 Dec 2022 |
Technical Notes & Articles (2)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| 2.4 | 11 Jul 2023 | 11 Jul 2023 | ||
| 1.0 | 02 May 2023 | 02 May 2023 |
Presentations (1)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| 2.2 | 02 Aug 2023 | 02 Aug 2023 |
Flyers (2)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| 2.0 | 05 Mar 2025 | 05 Mar 2025 | ||
| 1.0 | 22 Dec 2023 | 22 Dec 2023 |
Brochures (1)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| 6.0 | 30 Jul 2024 | 30 Jul 2024 |
EDA Symbols, Footprints and 3D Models
STMicroelectronics - L6981
Speed up your design by downloading all the EDA symbols, footprints and 3D models for your application. You have access to a large number of CAD formats to fit with your design toolchain.
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Symbols
Footprints
3D models
All resources
| Resource title | Version | Latest update |
|---|
SIMPLIS models (1)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| ZIP | 2023.07 | 25 Jan 2024 | 25 Jan 2024 |
Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| L6981C33DR | Active | SO-8 | Industrial | Ecopack2 | |
| L6981C50DR | Active | SO-8 | Industrial | Ecopack2 | |
| L6981CDR | Active | SO-8 | Industrial | Ecopack2 | |
| L6981N33DR | Active | SO-8 | Industrial | Ecopack2 | |
| L6981N50DR | Active | SO-8 | Industrial | Ecopack2 | |
| L6981NDR | Active | SO-8 | Industrial | Ecopack2 |
L6981C33DR
Package:
SO-8Material Declaration**:
L6981C50DR
Package:
SO-8Material Declaration**:
L6981N33DR
Package:
SO-8Material Declaration**:
L6981N50DR
Package:
SO-8Material Declaration**:
(**) 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.
Sample & Buy
| Part Number | Marketing Status | Budgetary Price (US$)*/Qty | Order from ST | Order from distributors | Package | Packing Type | RoHS | Country of Origin | ECCN (US) | ECCN (EU) | Operating Temperature (°C) (min) | Operating Temperature (°C) (max) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| L6981C50DR | Active | 0.94 / 10k | 5 distributors | SO-8 | Tape and Reel | CHINA | EAR99 | NEC | |||||
| L6981N50DR | Active | 0.94 / 10k | 4 distributors | SO-8 | Tape and Reel | CHINA | EAR99 | NEC | |||||
| L6981N33DR | Active | 0.94 / 10k | 4 distributors | SO-8 | Tape and Reel | CHINA | EAR99 | NEC | |||||
| L6981CDR | Active | 0.94 / 10k | 7 distributors | SO-8 | Tape and Reel | CHINA | EAR99 | NEC | |||||
| L6981NDR | Active | 0.94 / 10k | 6 distributors | SO-8 | Tape and Reel | CHINA | EAR99 | NEC | |||||
| L6981C33DR | Active | 0.94 / 10k | 5 distributors | SO-8 | Tape and Reel | CHINA | EAR99 | NEC |
L6981C50DR Active
L6981N50DR Active
L6981N33DR Active
L6981CDR Active
L6981NDR Active
L6981C33DR Active
(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors