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STMicroelectronics L6982C50DR
- Part No.:
- L6982C50DR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
L6982C50DR.pdf
- Description:
- IC REG BUCK 5V 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,345
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Product details
Overview
L6982C50DR from STMicroelectronics is a synchronous step-down DC-DC converter optimized for industrial 24 V bus systems and always-on sensor nodes. It delivers up to 2 A DC output current, operates from 3.5 V to 38 V input, supports fixed 5.0 V output with ±0.5% accuracy over temperature, and features 550 µA typical quiescent current in LNM mode. Its SO 8L package integrates internal compensation and enables low-noise operation via external clock synchronization.
For engineers reviewing the L6982C50DR datasheet, L6982C50DR pinout, L6982C50DR application, or L6982C50DR equivalent, key selection criteria include light-load noise performance (LNM mode), VIN-compatible enable threshold (1.2 V), 400 kHz nominal switching frequency, overvoltage protection trip at 120% VOUT, and thermal shutdown at 165 °C.
Technical Context
The L6982C50DR implements peak current mode control with integrated high-side and low-side MOSFETs (RDSON_HS = 0.175 Ω, RDSON_LS = 0.125 Ω) and slope compensation to prevent subharmonic oscillation. Its LNM variant enforces constant-frequency PWM across all load conditions, eliminating frequency modulation artifacts critical for EMI-sensitive applications like smart meters and robot cleaners.
Functional blocks include a transconductance error amplifier with internal compensation, pulse-by-pulse current sensing on both switches, a 1.3 ms internal soft-start, and dual-threshold EN/CLKIN pin supporting wake-up (0.5 V) and enable (1.2 V) logic levels. Synchronization capability (200–500 kHz) is exclusive to LNM versions and uses the same pin for enable and clock input.
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 ±0.5% - eliminates external feedback resistors and ensures stable MCU/peripheral supply under load and temperature variation. |
| Max Output Current | 2 A DC - sufficient to power microcontrollers, sensors, and communication ICs in decentralized nodes without external boost stages. |
| Quiescent Current (LNM) | 550 µA typical - enables multi-year battery life in always-on sensor applications while maintaining low-noise regulation. |
| Switching Frequency | 400 kHz nominal - balances EMI filtering size and efficiency; synchronizable to external clock for system-level noise coordination. |
| OVP Threshold | 120% of VOUT (6.0 V) - fast low-side sinking (1.5 A max) discharges output capacitor to protect downstream 5 V logic during fault events. |
| Thermal Shutdown | 165 °C with 30 °C hysteresis - prevents thermal runaway in enclosed industrial enclosures or high ambient environments. |
Pinout & Package
Package: SO 8L (8-pin small outline, exposed pad, RoHS-compliant). Thermal resistance RthJA = 55 °C/W on ST reference board. Pin 1 marked by notch or dot; top view orientation per DS13683 Rev 3 Figure 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching node | Connection point between HS and LS MOSFETs; requires low-inductance layout to minimize voltage spikes and EMI. |
| 2 BOOT | Bootstrap capacitor terminal | Connects 100 nF ceramic capacitor to SW to gate-drive HS MOSFET; critical for reliable high-side conduction. |
| 3 VCC | Analog supply rail | Powers internal bandgap, error amp, and logic; requires ≥1 µF ceramic bypass capacitor for stable reference generation. |
| 4 FB/VOUT | Feedback / output sense | Fixed 5 V version ties internal 0.85 V reference to output; no external divider needed - simplifies BOM and layout. |
| 5 EN/CLKIN | Enable + sync input | Dual-function pin: 1.2 V enable threshold for VIN-compatible control; 200–500 kHz clock input for LNM synchronization. |
| 6 AGND | Analog ground | Reference for error amplifier and internal circuits; must be separated from PGND and connected at single point near VCC capacitor. |
| 7 VIN | Main input supply | Accepts 3.5–38 V DC; requires 10 µF input capacitor close to pin to suppress ripple and handle transient currents. |
| 8 PGND | Power ground | Return path for HS/LS switch currents; connects to thermal pad; must be low-impedance copper pour under device. |
Key Features
| Feature | Design Value |
|---|---|
| Low Noise Mode (LNM) | Forced PWM with constant 400 kHz frequency - eliminates audible noise and spectral spreading, meeting strict EMC requirements in smart meters. |
| Internal Compensation | No external compensation components required - reduces design cycle time and PCB area; validated for 22 µH inductor + 47 µF MLCC output. |
| VIN-Compatible Enable | EN pin accepts up to 38 V logic - eliminates level-shifter circuitry when controlled directly from 24 V system rails. |
| Overvoltage Protection | Active low-side sinking (1.5 A max) triggers at 6.0 V - clamps output during startup overshoot or load-dump transients without external TVS. |
| Thermal Protection | 165 °C shutdown with 30 °C hysteresis - allows safe recovery after overload without manual reset or system intervention. |
Applications
| Industrial 24 V Power Nodes | Smart Meter Power Supply |
|---|---|
|
Use Scenario: Distributed I/O modules powered from centralized 24 V DC bus in factory automation systems. IC Role / Device Role / Timing Role: Primary 5 V regulator supplying PLC controllers, analog front-ends, and CAN transceivers. Use Value: Wide 3.5–38 V input range tolerates bus voltage fluctuations; 2 A output supports multiple peripherals; SO 8L footprint enables compact DIN-rail mount designs. |
Use Scenario: Mains-powered utility meter requiring ultra-low EMI and long-term reliability in sealed enclosures. IC Role / Device Role / Timing Role: Low-noise 5 V supply for metrology ADC, real-time clock, and secure MCU subsystems. Use Value: LNM mode ensures fixed 400 kHz switching avoids interference with 50/60 Hz line harmonics; 550 µA IQ enables >10-year battery backup runtime. |
| Robot Cleaner Control Board | Always-On Sensor Node |
|
Use Scenario: Compact vacuum robot mainboard with motor drivers, IMU, and Wi-Fi SoC sharing a single 5 V rail. IC Role / Device Role / Timing Role: Central DC-DC converter delivering clean 5 V to mixed-signal loads under dynamic motor load transients. Use Value: Internal soft-start (1.3 ms) limits inrush during boot; OVP protects Wi-Fi module from 5 V rail faults; thermal shutdown prevents overheating during stalled-motor conditions. |
Use Scenario: Battery-powered environmental sensor node deployed in remote locations with 10+ year lifetime requirement. IC Role / Device Role / Timing Role: Primary regulator converting 3.6–4.2 V Li-ion to stable 5 V for BLE SoC and digital sensors. Use Value: 550 µA LNM IQ minimizes standby drain; VIN-compatible EN allows direct MCU GPIO control; SO 8L package supports automated assembly and reflow reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54202DRCT | 3.5–28 V input, 2 A, 500 kHz, 25 µA IQ (non-synchronous), no OVP or sync input | Lacks overvoltage protection and clock synchronization; higher IQ in light-load PWM mode | Select only if input voltage never exceeds 28 V and system-level OVP is implemented externally. |
| MP2451DT-LF-Z | 4.5–36 V input, 2 A, 340 kHz, 260 µA IQ, no LNM/LCM modes, no sync, no OVP | Fixed-frequency only, no low-noise optimization; no VIN-compatible enable; no thermal hysteresis spec | Use where cost is primary constraint and EMI filtering budget allows wider spectral spread. |
Compared with TPS54202DRCT and MP2451DT-LF-Z, the L6982C50DR uniquely combines 38 V input tolerance, integrated OVP with active sinking, VIN-compatible enable, and selectable LNM mode - making it the only option qualified for unregulated 24 V industrial bus and certified low-noise metering applications.
Availability
L6982C50DR is available at Aetrix Electronics and suitable for industrial 24 V power nodes, smart meter power supplies, and robot cleaner control boards requiring stable component supply across extended product lifecycles.
Supply support for L6982C50DR 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 vertical manufacturing and rigorous AEC-Q100 alignment.
The L6982 belongs to ST's industrial-grade synchronous buck regulator family, designed specifically for robust operation in 24 V industrial buses, battery-powered equipment, and noise-critical metering applications - emphasizing reliability, integrated protection, and simplified design-in.
FAQ
What is the difference between L6982C50DR and L6982C33DR?
The L6982C50DR provides a fixed 5.0 V output with ±0.5% accuracy over –40 °C to 125 °C, while the L6982C33DR delivers fixed 3.3 V output with identical tolerance and thermal specs. Both share the same SO 8L package, LNM operation, 400 kHz switching, and protection features - selection depends solely on required output voltage for the target load.
Can L6982C50DR synchronize to an external clock in LNM mode?
Yes - the EN/CLKIN pin (Pin 5) accepts external clock signals from 200 kHz to 500 kHz in LNM versions only. The device locks to the external frequency within one cycle and maintains phase coherence, enabling deterministic EMI reduction in multi-rail systems without requiring additional timing ICs.
Does L6982C50DR require external compensation components?
No - the L6982C50DR integrates a complete compensation network optimized for standard 22 µH inductors and 47 µF MLCC output capacitors. External compensation is unnecessary for stable operation across full load and temperature ranges, reducing BOM count and layout complexity.
How does overvoltage protection work on L6982C50DR?
When FB voltage exceeds 120% of nominal (6.0 V), the L6982C50DR activates its low-side MOSFET to sink up to 1.5 A, discharging the output capacitor until voltage falls below hysteresis (5.9 V). This second-level protection operates independently of the main control loop and responds within microseconds to prevent damage to 5 V logic devices.
L6982C50DR 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
L6982C50DR FAQ
1.How can I place an order for L6982C50DR through Aetrix?
Please submit a Request for Quotation (RFQ) for L6982C50DR 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 L6982C50DR reliable?
The price and inventory of L6982C50DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6982C50DR is usually 5 days.
3.What payment methods are accepted for L6982C50DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6982C50DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L6982C50DR?
L6982C50DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L6982C50DR 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 L6982C50DR?
For technical support, including L6982C50DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6982C50DR requirements.
6.How does Aetrix verify that L6982C50DR is sourced from the original manufacturer or authorized distributors?
All L6982C50DR 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 L6982C50DR meets industry standards.
7.What is the process for return or replacement of L6982C50DR?
All L6982C50DR units undergo pre-shipment inspection (PSI). If there is an issue with L6982C50DR, 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 L6982C50DR part is unused and in its original packaging.
Return procedure for L6982C50DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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