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STMicroelectronics L6982C33DR
- Part No.:
- L6982C33DR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
L6982C33DR.pdf
- Description:
- IC REG BUCK 3.3V 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,220
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Product details
Overview
L6982C33DR from STMicroelectronics is a synchronous step-down DC-DC converter delivering up to 2 A output current with fixed 3.3 V output, 3.5–38 V input range, 20 µA quiescent current (LCM mode), and SO-8L package. It integrates peak-current-mode control, internal compensation, soft-start, overvoltage/thermal protection, and supports output voltage sequencing for industrial power rails and always-on sensor nodes.
For engineers reviewing the L6982C33DR datasheet, L6982C33DR pinout, L6982C33DR application, or L6982C33DR equivalent, this device is selected for 24 V bus systems requiring low-light-load quiescent current, noise-sensitive fixed-output regulation, and VIN-compatible enable with synchronization capability in LNM variants.
Technical Context
The L6982C33DR implements peak-current-mode control with integrated slope compensation to prevent subharmonic oscillation. Its error amplifier features an internal compensation network, eliminating external components for stability. The device operates in either Low Consumption Mode (LCM) - enabling pulse-skipping at light loads for <20 µA IQ - or Low Noise Mode (LNM) - enforcing constant-frequency PWM with 360–440 kHz switching and external clock synchronization capability.
It integrates high-side and low-side MOSFETs (RDSON_HS = 0.175 Ω, RDSON_LS = 0.125 Ω), pulse-by-pulse current sensing on both switches, and valley-current limiting (2.2–2.6 A) for robust overcurrent protection. The EN/CLKIN pin serves dual function: digital enable with 1.2 V threshold and, in LNM versions only, 200–500 kHz synchronization input with 2.3 V amplitude threshold.
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 3.3 V ±1% - eliminates external feedback resistors; ensures stable logic supply for microcontrollers and sensors. |
| Max Output Current | 2 A DC - sufficient for powering multiple peripherals or embedded controllers from a single buck stage. |
| Quiescent Current (LCM) | 20 µA typical from VIN - enables multi-year battery life in always-on sensor nodes and smart meters. |
| Switching Frequency | 360–440 kHz (typ. 400 kHz) - balances EMI, inductor size, and efficiency; synchronizable in LNM mode. |
| Soft-Start Time | 1.3 ms internal ramp - prevents inrush current and output overshoot during power-up or recovery from fault. |
| OVP Threshold | 120% of nominal (3.96 V) with 2% hysteresis - discharges output via low-side FET to protect downstream ICs during transient overvoltage. |
Pinout & Package
Package: SO-8L (Small Outline, 8-lead, exposed pad variant not specified; standard SOIC-8 footprint per DS13683 Rev 3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching node | Connection point between HS and LS FETs; requires low-inductance layout to minimize ringing and EMI. |
| 2 BOOT | Bootstrap capacitor terminal | Connects 100 nF ceramic cap to SW; supplies gate drive voltage for high-side MOSFET during conduction. |
| 3 VCC | Analog supply rail | Internally regulated ~3.3 V; powers control circuitry; requires ≥1 µF ceramic bypass to AGND. |
| 4 FB/VOUT | Feedback / Fixed-output sense | Internally connected to 3.3 V reference; no external divider needed for fixed-output version. |
| 5 EN/CLKIN | Enable input / Sync clock input | Digital enable (1.2 V threshold); in LNM variants only, accepts 200–500 kHz external clock for EMI reduction. |
| 6 AGND | Analog ground | Reference for error amp and sensing circuits; must be separated from PGND and tied at single point near VCC cap. |
| 7 VIN | Main input supply | Accepts 3.5–38 V; connects to bulk input capacitor; pin rated to 42 V absolute max. |
| 8 PGND | Power ground | Return path for HS/LS FETs and inductor; requires low-impedance copper pour to minimize voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Compensation | Eliminates external Type-II/III compensation network - reduces BOM count and design iteration time. |
| Two Light-Load Modes | LCM (pulse-skipping, 20 µA IQ) for battery longevity; LNM (forced PWM, constant fSW) for low-noise analog/sensor rails. |
| VIN-Compatible Enable | EN pin operates up to 38 V - allows direct tie to unregulated input without level-shifting circuitry. |
| Overvoltage Protection | Active discharge via low-side FET when VOUT exceeds 3.96 V - protects downstream 3.3 V logic without external TVS. |
| Pulse-by-Pulse OCP | Independent peak (HS) and valley (LS) current sensing - ensures full-duty-cycle protection without masking gaps. |
Applications
| Industrial 24 V Power Rail | Smart Meter Power Supply |
|---|---|
|
Use Scenario: Distributed 24 V bus powering PLC I/O modules, field transmitters, and HART communicators. IC Role / Device Role / Timing Role: Primary 3.3 V point-of-load regulator converting unregulated 24 V bus to clean logic supply. Use Value: 2 A output sustains burst current for RS-485 transceivers; 20 µA IQ minimizes standby loss across hundreds of nodes. |
Use Scenario: Battery-backed utility meter with real-time clock, metrology ADC, and RF/PLC communication. IC Role / Device Role / Timing Role: Always-on 3.3 V supply maintaining RTC and memory during main power outage. Use Value: 20 µA quiescent current extends 10-year lithium battery life; internal soft-start prevents meter reset on wake-up. |
| Robot Cleaner Control Board | Decentralized Sensor Node |
|
Use Scenario: Compact motor-control board with MCU, IMU, and brushless driver ICs operating from 24 V battery pack. IC Role / Device Role / Timing Role: Main 3.3 V domain regulator powering MCU core, flash, and interface peripherals. Use Value: SO-8L package fits tight layouts; thermal shutdown (165 °C) prevents damage during motor stall conditions. |
Use Scenario: Wireless environmental sensor node (temp/humidity/pressure) deployed in factory HVAC ducts. IC Role / Device Role / Timing Role: Low-noise 3.3 V supply for precision analog front-end and ultra-low-power BLE SoC. Use Value: LNM mode provides constant 400 kHz switching and minimal VOUT ripple (<5 mV with MLCC), preserving ADC SNR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36520RNXR | 4.5–65 V input, 2 A, 26 µA IQ, no internal compensation, requires external loop compensation. | Higher VIN max suits 48 V industrial systems; lacks fixed 3.3 V option - needs FB resistor network. | Select when wider input range or higher voltage margin is required; accept added design complexity for compensation. |
| TPS62865ARGTR | 2.7–6 V input, 3 A, 15 µA IQ, 2.4 MHz fSW, integrated inductor option available. | Optimized for low-VIN battery apps (e.g., USB-C PD); incompatible with 24 V input due to VIN limit. | Choose only for sub-6 V systems where ultra-small solution size and high fSW outweigh input range limitations. |
Compared with LMR36520RNXR and TPS62865ARGTR, the L6982C33DR uniquely combines 3.5–38 V operation, fixed 3.3 V output, internal compensation, and dual LCM/LNM modes - making it optimal for 24 V industrial nodes where simplicity, low IQ, and noise control are jointly critical.
Availability
L6982C33DR is available at Aetrix Electronics and suitable for industrial automation, smart metering, robotics, and decentralized sensor networks requiring stable component supply across long product lifecycles.
Supply support for L6982C33DR 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 broad industrial qualification.
The L6982 series targets industrial and energy-metering applications demanding wide-input, low-IQ, and robust protection - designed specifically for 24 V bus systems and battery-powered always-on nodes.
FAQ
What is the difference between L6982C33DR and L6982C50DR?
The L6982C33DR delivers a fixed 3.3 V output, while the L6982C50DR provides a fixed 5.0 V output. Both share identical input range (3.5–38 V), 2 A current capability, SO-8L package, and dual LCM/LNM light-load modes. The internal feedback reference is trimmed to 0.85 V for adjustable versions, but hard-wired to 3.3 V or 5.0 V in their respective fixed-output variants - no external resistors are required in either case.
Can L6982C33DR synchronize to an external clock?
Only LNM-version devices (e.g., L6982L33DR) support external clock synchronization on the EN/CLKIN pin. The L6982C33DR is an LCM-version part and does not implement forced PWM or clock sync functionality. Its EN pin operates solely as a digital enable with 1.2 V threshold and 2 µA shutdown current; applying a clock signal will not yield synchronization and may cause erratic behavior.
How does the overvoltage protection (OVP) operate on L6982C33DR?
The OVP monitors the FB pin and triggers when output voltage exceeds 120% of nominal (3.96 V). Upon detection, the low-side MOSFET is activated to sink current and discharge the output capacitor. The device limits reverse current to 1.25–1.75 A (IVY_SINK) to prevent damage. OVP is a secondary safety feature - proper loop compensation and component selection must ensure regulation stays within ±1% under all load transients to avoid activation during normal operation.
Is thermal shutdown automatically recovered after cooling?
Yes. When junction temperature reaches 165 °C (TSHDWN), thermal shutdown disables switching and holds the device in hiccup mode until temperature falls below 135 °C (165 °C – 30 °C hysteresis). Once cooled, the internal soft-start sequence (1.3 ms ramp) automatically resumes regulation without requiring EN pin toggling or external reset - ensuring autonomous recovery in thermally constrained enclosures.
L6982C33DR 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):
- 3.3V
- 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
L6982C33DR FAQ
1.How can I place an order for L6982C33DR through Aetrix?
Please submit a Request for Quotation (RFQ) for L6982C33DR 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 L6982C33DR reliable?
The price and inventory of L6982C33DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6982C33DR is usually 5 days.
3.What payment methods are accepted for L6982C33DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6982C33DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L6982C33DR?
L6982C33DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L6982C33DR 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 L6982C33DR?
For technical support, including L6982C33DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6982C33DR requirements.
6.How does Aetrix verify that L6982C33DR is sourced from the original manufacturer or authorized distributors?
All L6982C33DR 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 L6982C33DR meets industry standards.
7.What is the process for return or replacement of L6982C33DR?
All L6982C33DR units undergo pre-shipment inspection (PSI). If there is an issue with L6982C33DR, 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 L6982C33DR part is unused and in its original packaging.
Return procedure for L6982C33DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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