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STMicroelectronics L6982N50DR
- Part No.:
- L6982N50DR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
L6982N50DR.pdf
- Description:
- IC REG BUCK 5V 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,262
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Product details
Overview
L6982N50DR from STMicroelectronics is a synchronous monolithic step-down DC-DC converter delivering up to 2 A output current with 3.5 V to 38 V input range, fixed 5.0 V output, and 20 μA quiescent current in LCM mode. It implements peak current mode control in SO-8L package and supports output voltage sequencing, overvoltage protection, and thermal shutdown - deployed in smart meters and robot cleaners requiring stable 5 V rail from 24 V bus.
For engineers reviewing the L6982N50DR datasheet, L6982N50DR pinout, L6982N50DR application, or L6982N50DR equivalent, key selection criteria include its 5 V fixed output accuracy (±0.9% over -40°C to +125°C), 400 kHz nominal switching frequency, EN/CLKIN dual-function pin for enable or external synchronization (LNM only), and VIN-compatible enable threshold (1.2 V rising).
Technical Context
The L6982N50DR uses peak current mode architecture with integrated slope compensation to prevent subharmonic oscillation. Its internal transconductance error amplifier features an embedded compensation network, eliminating external components while maintaining stability across 0.85–VIN output range.
This fixed 5.0 V variant operates in Low Consumption Mode (LCM), achieving 20 μA typical IQ from VIN at light load and enabling skip-mode regulation with 0.85 V feedback reference. The EN/CLKIN pin provides VIN-compatible enable functionality (1.2 V threshold) and supports output voltage sequencing via controlled soft-start (1.3 ms).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 38 V - supports direct connection to 24 V industrial buses and wide-range battery inputs without pre-regulation. |
| Output Voltage | Fixed 5.0 V ±0.9% - guaranteed over full temperature range (-40°C to +125°C), eliminating need for external resistor divider. |
| Max Output Current | 2 A DC - sustained delivery under continuous load with integrated high-side (0.175 Ω) and low-side (0.125 Ω) MOSFETs. |
| Quiescent Current | 20 μA (typ.) from VIN - enables always-on operation in sensors and smart meters with minimal standby power loss. |
| Switching Frequency | 400 kHz (typ.) - balances EMI performance and inductor size; synchronizable externally for LNM variants (not applicable to N50DR). |
| Soft-Start Time | 1.3 ms (typ.) - limits inrush current during power-up and ensures monotonic VOUT ramp for downstream logic sequencing. |
| Overvoltage Protection | Triggers at 120% nominal (6.0 V) - discharges output capacitor via low-side FET to protect downstream 5 V ICs during fault conditions. |
Pinout & Package
Supplied in SO-8L (Small Outline, 8-lead, exposed pad) package with standard 1.27 mm pitch and thermal pad for enhanced power dissipation. Pinout validated per STMicroelectronics DS13683 Rev 3 (page 3/50).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching node | Connection point between internal high-side and low-side MOSFETs; requires low-inductance layout to minimize switching losses and EMI. |
| 2 BOOT | Bootstrap supply | Connects 100 nF capacitor to SW to generate gate drive voltage for high-side MOSFET; critical for proper HS turn-on. |
| 3 VCC | Analog supply rail | Powers internal reference and error amplifier; requires ≥1 µF ceramic bypass capacitor to stabilize bandgap reference. |
| 4 FB/VOUT | Feedback / output sense | Internally connected to 5.0 V reference; no external divider needed - simplifies layout and improves accuracy vs adjustable versions. |
| 5 EN/CLKIN | Enable / sync input | Digital enable pin (1.2 V threshold); for L6982N50DR (LCM version), CLKIN function is not active - used solely for enable/disable control. |
| 6 AGND | Analog ground | Reference for error amplifier and internal circuits; must be separated from PGND and tied at single point near VCC capacitor. |
| 7 VIN | Main input supply | Accepts 3.5–38 V DC; connects to bulk input capacitor (10 µF min.) to suppress line transients and reduce ripple injection. |
| 8 PGND | Power ground | Return path for high-current switching paths (HS/LS FETs, SW, VIN); ties to thermal pad for optimal thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated compensation network | Eliminates external Type-II/III compensation components - reduces BOM count and design iteration time for stable 5 V output. |
| Internal soft-start (1.3 ms) | Prevents output overshoot and inrush current spikes during startup - essential for powering microcontrollers and sensors without reset issues. |
| VIN-compatible enable pin | EN threshold (1.2 V) referenced to VIN - allows direct interface with 3.3 V or 5 V logic without level-shifting circuitry. |
| Overvoltage protection (OVP) | Auto-discharges output via low-side FET when VOUT exceeds 6.0 V - protects downstream 5 V ICs without external crowbar circuit. |
| Thermal shutdown with hysteresis | Shuts down at 165 °C junction temperature and restarts at 135 °C - prevents thermal runaway in enclosed industrial enclosures. |
Applications
| Smart Meters | Robot Cleaners |
|---|---|
|
Use Scenario: Powering metrology ICs, RF modules, and real-time clocks in Class 0.5S electricity meters operating from 24 V backup battery or PLC-powered rails. IC Role / Device Role / Timing Role: Primary 5 V buck regulator supplying isolated analog front-end and secure MCU subsystems. Use Value: 20 μA quiescent current extends battery life beyond 10 years in standby; OVP prevents damage to precision ADCs during transient surges. |
Use Scenario: Providing regulated 5 V rail to motor control MCU, SLAM processor, and IR sensor array in compact vacuum robots with 24 V Li-ion packs. IC Role / Device Role / Timing Role: Main system power stage enabling coordinated actuator and sensing subsystem timing via clean, sequenced VOUT ramp. Use Value: 2 A capability supports burst motor current without brownout; SO-8L package fits tight PCB space constraints near battery connector. |
| Decentralized Sensor Nodes | Industrial 24 V Bus Systems |
|
Use Scenario: Always-on environmental monitoring nodes (temperature/humidity/CO₂) mounted on DIN-rail panels powered directly from 24 V factory bus. IC Role / Device Role / Timing Role: Standby-optimized DC-DC converter powering ultra-low-power wireless SoCs (e.g., Nordic nRF52840) and analog signal chains. Use Value: LCM mode maintains >85% efficiency at 1 mA load - critical for energy harvesting or battery-only deployments with multi-year lifetime. |
Use Scenario: Distributed I/O module power supply in PLC backplanes where multiple 5 V peripherals (valve drivers, encoder interfaces) draw from shared 24 V rail. IC Role / Device Role / Timing Role: Local point-of-load regulator ensuring noise-immune 5 V for digital isolators and RS-485 transceivers. Use Value: Internal compensation and 400 kHz switching enable small 22 µH inductor + 47 µF MLCC solution - reduces board area vs legacy controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR14020PDDAR | 40 V input, 2 A, 400 kHz, but requires external compensation and has 40 μA IQ (vs 20 μA). | Lacks integrated soft-start and OVP; needs external circuitry for sequencing and fault protection. | Choose if design requires adjustable output or TI ecosystem support; avoid if minimizing BOM and layout area is priority. |
| TPS54202DRCT | 6 V to 28 V input, 2 A, 400 kHz, 25 μA IQ, but no OVP and only 28 V max VIN (vs 38 V). | No overvoltage protection or thermal hysteresis; unsuitable for 36 V transients common in industrial 24 V systems. | Select for cost-sensitive consumer applications with strict 24 V input; reject for smart meter or DIN-rail use due to insufficient voltage margin. |
Compared with LMR14020PDDAR and TPS54202DRCT, the L6982N50DR delivers superior system-level integration (OVP, soft-start, compensation), wider input range (38 V), and lower quiescent current - reducing component count and improving reliability in industrial always-on designs.
Availability
L6982N50DR is available at Aetrix Electronics and suitable for smart meters, robot cleaners, decentralized sensor nodes, and industrial 24 V bus systems requiring stable component supply with long-term lifecycle assurance.
Supply support for L6982N50DR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in power management, microcontrollers, and automotive-grade ICs with ISO 9001 and IATF 16949 certified manufacturing.
The L6982 series targets industrial and battery-powered applications demanding high efficiency at light load, robust protection, and minimal external components - specifically engineered for 24 V bus infrastructure and always-on edge devices.
FAQ
Is the L6982N50DR pin-compatible with other L6982 variants?
Yes - all L6982 variants (including L6982N33DR and L6982ADJ) share identical SO-8L pinout and footprint. However, the FB/VOUT pin is internally tied to 5.0 V reference in N50DR, so external resistor dividers must be omitted to avoid conflict and ensure correct regulation.
Does the L6982N50DR support external clock synchronization?
No - external clock synchronization via the EN/CLKIN pin is exclusive to LNM (Low Noise Mode) variants such as L6982N50DR-LNM. The L6982N50DR is an LCM (Low Consumption Mode) part; its EN/CLKIN pin functions only as a digital enable input with 1.2 V threshold and no clock input capability.
What is the maximum recommended output capacitance for stable operation?
STMicroelectronics specifies 47 µF (MLCC) as the typical output capacitor value in the datasheet's application circuit. Stability is maintained up to 100 µF with appropriate ESR (≤5 mΩ), but exceeding this may degrade phase margin and cause soft-start overshoot - verify loop response using the provided compensation guidelines in Section 7.2 of DS13683.
How does overvoltage protection behave during a load dump event?
During a load dump (e.g., sudden 24 V bus surge to 36 V), the L6982N50DR's OVP triggers if VOUT exceeds 6.0 V (120% of 5 V). It activates the low-side MOSFET to sink up to 1.5 A (typ.), discharging the output capacitor until VOUT falls below 5.9 V (2% hysteresis). This clamps overvoltage without latch-off, allowing automatic recovery once input stabilizes.
L6982N50DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 38V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
L6982N50DR FAQ
1.How can I place an order for L6982N50DR through Aetrix?
Please submit a Request for Quotation (RFQ) for L6982N50DR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for L6982N50DR reliable?
The price and inventory of L6982N50DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6982N50DR is usually 5 days.
3.What payment methods are accepted for L6982N50DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6982N50DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L6982N50DR?
L6982N50DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L6982N50DR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for L6982N50DR?
For technical support, including L6982N50DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6982N50DR requirements.
6.How does Aetrix verify that L6982N50DR is sourced from the original manufacturer or authorized distributors?
All L6982N50DR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that L6982N50DR meets industry standards.
7.What is the process for return or replacement of L6982N50DR?
All L6982N50DR units undergo pre-shipment inspection (PSI). If there is an issue with L6982N50DR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The L6982N50DR part is unused and in its original packaging.
Return procedure for L6982N50DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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