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STMicroelectronics L6982N33DR
- Part No.:
- L6982N33DR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
L6982N33DR.pdf
- Description:
- IC REG BUCK 3.3V 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,295
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Product details
Overview
L6982N33DR from STMicroelectronics is a synchronous step-down DC-DC converter delivering up to 2 A output current with fixed 3.3 V output, operating from 3.5 V to 38 V input. It features 20 µA quiescent current in LCM mode, internal compensation, and SO 8L package - designed for industrial 24 V bus systems, smart meters, and always-on sensor nodes requiring high light-load efficiency and robust overvoltage/thermal protection.
For engineers reviewing the L6982N33DR datasheet, L6982N33DR pinout, L6982N33DR application, or L6982N33DR equivalent, key selection criteria include its dual-mode operation (LCM/LNM), VIN-compatible enable pin with 1.2 V threshold, 0.85 V feedback reference, 400 kHz typical switching frequency, and integrated soft-start with 1.3 ms ramp - critical for stable power-up in battery-backed and noise-sensitive embedded systems.
Technical Context
The L6982N33DR implements peak current mode control with internal slope compensation to prevent subharmonic oscillation. Its architecture integrates high-side and low-side MOSFETs (RDS(on) = 0.175 Ω / 0.125 Ω), pulse-by-pulse current sensing on both switches, and valley-current limiting (2.2–2.6 A) for reliable overcurrent protection across duty cycles.
This device supports two operational modes: Low Consumption Mode (LCM) for ultra-low IQ (1–6 µA from VIN in fixed-VOUT configuration) and Low Noise Mode (LNM) with forced PWM, constant 400 kHz switching, and external clock synchronization capability (200–500 kHz range) - enabling precise EMI control in sensitive measurement applications.
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 resistor divider, reduces BOM count, and ensures stable MCU/Sensor rail compliance. |
| Max Output Current | 2 A DC - sufficient to power microcontrollers, transceivers, and analog front-ends in decentralized nodes. |
| Quiescent Current (LCM) | 1–6 µA from VIN - enables multi-year battery life in always-on sensor applications with intermittent wake-up. |
| Switching Frequency | 360–440 kHz (typ. 400 kHz) - balances inductor size vs. EMI, compatible with standard 22 µH shielded inductors. |
| Soft-Start Time | 1.3 ms (typ.) - limits inrush current during power-up, preventing input rail droop and system reset events. |
| Enable Threshold | 1.08–1.32 V rising - VIN-compatible logic interface allows direct connection to 3.3 V GPIO without level-shifting. |
Pinout & Package
Package: SO 8L (8-pin Small Outline, exposed pad, RoHS-compliant). Thermal resistance RthJA = 55 °C/W on ST demo board - requires minimum 200 mm² copper pour under exposed pad for full 2 A thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching node | High dv/dt node connecting internal HS/LS FETs; requires tight layout with minimal loop area to reduce EMI. |
| 2 BOOT | Bootstrap capacitor connection | Connects 100 nF ceramic cap to SW; supplies gate drive voltage for high-side MOSFET during conduction. |
| 3 VCC | Analog supply rail | Powers internal error amplifier and logic; requires ≥1 µF ceramic bypass cap to stabilize reference and reduce noise coupling. |
| 4 FB/VOUT | Feedback input / output sense | Monitors regulated 3.3 V output directly (fixed version); no external resistors needed - simplifies layout and improves accuracy. |
| 5 EN/CLKIN | Enable input / sync clock input | Active-high enable with 1.2 V threshold; in LNM variants, accepts 200–500 kHz external clock for EMI spreading or system timing alignment. |
| 6 AGND | Analog ground reference | Separate ground for feedback and control circuitry; must be connected to PGND at single point near VCC capacitor to avoid noise injection. |
| 7 VIN | Main input supply | Accepts 3.5–38 V DC; requires 10 µF low-ESR input capacitor placed within 5 mm of VIN and PGND pins. |
| 8 PGND | Power ground return | High-current return path for HS/LS switches and output inductor; connects to thermal pad for optimal heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Compensation Network | Eliminates external Type-II/III compensation components - reduces design cycle time and PCB area by ~12 mm². |
| Two Operational Modes (LCM/LNM) | LCM delivers ≤6 µA IQ for battery longevity; LNM enforces constant frequency and <10 mVpp ripple at light load for ADC/reference stability. |
| Integrated Overvoltage Protection (OVP) | Triggers at 115–125% nominal output (3.8–4.1 V), discharging COUT via LS FET to protect downstream 3.3 V logic - no external crowbar needed. |
| VIN-Compatible Enable Pin | Operates from 0.7 V wakeup to 1.32 V enable threshold - interfaces directly with microcontroller GPIO or discrete comparator outputs without pull-up resistors. |
| Thermal Shutdown with Hysteresis | Shuts down at 165 °C (TSHDN) and restarts at 135 °C (30 °C hysteresis) - prevents cycling during sustained overload and enables safe derating. |
Applications
| Industrial 24 V Power Nodes | Smart Meter Power Supply |
|---|---|
|
Use Scenario: Distributed I/O modules powered from 24 V factory bus with variable load and ambient temperature up to 85 °C. IC Role / Device Role / Timing Role: Primary 3.3 V regulator supplying PLC controller, CAN transceiver, and isolation drivers. Use Value: 38 V max input withstands 24 V bus transients (IEC 61000-4-5); 2 A capacity supports burst communication loads; SO 8L package enables compact DIN-rail mount design. |
Use Scenario: Battery-backed electricity meter with real-time clock, metrology ADC, and RF mesh radio operating continuously for >10 years. IC Role / Device Role / Timing Role: Always-on 3.3 V rail generator with ultra-low quiescent current during sleep mode. Use Value: 1 µA typical IQ in LCM mode extends primary lithium battery life beyond 12 years; OVP protects metrology reference from surge-induced drift. |
| Robot Cleaner Control Board | Noise-Sensitive Sensor Hub |
|
Use Scenario: Compact vacuum robot mainboard with motor drivers, IMU, and SLAM processor sharing 24 V battery input. IC Role / Device Role / Timing Role: Secondary 3.3 V supply for MCU, flash memory, and Wi-Fi SoC - must survive repeated motor startup surges. Use Value: Input UVLO (2.15 V falling) prevents brownout resets during battery sag; thermal shutdown (165 °C) safeguards against enclosed chassis overheating. |
Use Scenario: Multi-sensor environmental station measuring temperature, humidity, and VOC with 24-bit sigma-delta ADCs. IC Role / Device Role / Timing Role: Low-noise 3.3 V reference rail for precision analog signal chain - synchronized to system clock to avoid beat frequencies. Use Value: LNM mode provides constant 400 kHz switching and <5 mVpp ripple with MLCC output cap; CLKIN sync eliminates spectral peaks in FFT analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQWR | 4.5–36 V input, 3.3 V fixed, 8 A output, 15 µA IQ, 2.1 MHz switching - higher current, higher frequency, larger solution size. | Targets high-power motor control or multi-rail systems where 2 A is insufficient; not optimized for ultra-low-IQ battery use. | Select when >2 A output or faster transient response is required; verify thermal design for SO PowerPAD footprint. |
| TPS6286413RTER | 3–18 V input, 3.3 V fixed, 4 A output, 1.5 µA IQ, 2.25 MHz - narrower VIN range, lower max voltage, smaller 1.5 mm × 2.0 mm QFN. | Suited for portable electronics with Li-ion input only; lacks 38 V surge tolerance and industrial temp grade (-40 to 125 °C). | Choose for space-constrained consumer designs with ≤18 V supply; avoid in 24 V industrial environments due to input voltage limit. |
Compared with LM61480RQWR and TPS6286413RTER, the L6982N33DR uniquely balances 38 V industrial input tolerance, 2 A output, ultra-low 1–6 µA IQ in LCM mode, and SO 8L manufacturability - making it optimal for cost-sensitive, long-life, 24 V-powered embedded nodes where reliability and thermal simplicity outweigh raw speed or current headroom.
Availability
L6982N33DR is available at Aetrix Electronics and suitable for industrial automation controllers, smart utility meters, robotic cleaning platforms, and noise-critical sensor hubs requiring stable component supply across extended product lifecycles.
Supply support for L6982N33DR 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 ICs - with over 40 years of analog/mixed-signal design heritage and ISO/TS 16949-certified manufacturing.
The L6982 series targets industrial and metering applications needing wide-input, low-quiescent-current DC-DC regulation - designed specifically for robustness in 24 V bus environments and battery-backed always-on systems.
FAQ
What is the difference between L6982N33DR and L6982N50DR?
The L6982N33DR delivers a fixed 3.3 V output, while the L6982N50DR 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 mode operation. Feedback reference is trimmed to 0.85 V internally for 3.3 V (3.27–3.33 V at 25 °C) or 5.0 V (4.955–5.045 V) versions, with no external resistor network required in either case.
Can L6982N33DR synchronize to an external clock?
Yes - but only in Low Noise Mode (LNM) variants. The EN/CLKIN pin serves dual function: enable control and external clock input (200–500 kHz, 2.3 V amplitude). The L6982N33DR is an LCM-part number (as indicated by 'N' suffix per ST naming convention), so synchronization is not supported. For sync capability, select L6982ADJ-LNM or L6982N33DR-LNM variants instead.
How does the overvoltage protection (OVP) behave during fault conditions?
OVP triggers when FB voltage exceeds 115–125% of nominal output (i.e., 3.8–4.1 V for 3.3 V version), activating the low-side MOSFET to discharge COUT. It sustains up to 1.75 A reverse current (IVY_SINK) before clamping, with 1–6 % hysteresis. This is a secondary protection - proper compensation and component selection must keep regulation within ±1% under all load transients to avoid OVP activation during normal operation.
Is thermal pad soldering required for full 2 A operation?
Yes - the SO 8L package includes an exposed thermal pad (Pin 0) that must be soldered to ≥200 mm² of inner-layer or bottom-side copper pour with ≥4 thermal vias (0.3 mm diameter) to achieve rated 2 A continuous output at 125 °C ambient. Without this, thermal derating begins above 1.2 A at 85 °C ambient, per RthJA = 55 °C/W specification on ST's evaluation board layout.
L6982N33DR 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
L6982N33DR FAQ
1.How can I place an order for L6982N33DR through Aetrix?
Please submit a Request for Quotation (RFQ) for L6982N33DR 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 L6982N33DR reliable?
The price and inventory of L6982N33DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6982N33DR is usually 5 days.
3.What payment methods are accepted for L6982N33DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6982N33DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L6982N33DR?
L6982N33DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L6982N33DR 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 L6982N33DR?
For technical support, including L6982N33DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6982N33DR requirements.
6.How does Aetrix verify that L6982N33DR is sourced from the original manufacturer or authorized distributors?
All L6982N33DR 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 L6982N33DR meets industry standards.
7.What is the process for return or replacement of L6982N33DR?
All L6982N33DR units undergo pre-shipment inspection (PSI). If there is an issue with L6982N33DR, 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 L6982N33DR part is unused and in its original packaging.
Return procedure for L6982N33DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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