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STMicroelectronics L6982NDR
- Part No.:
- L6982NDR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
L6982NDR.pdf
- Description:
- IC REG BUCK ADJ 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:618
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Product details
Overview
L6982NDR from STMicroelectronics is a synchronous monolithic step-down DC-DC converter delivering up to 2 A output current, operating from 3.5 V to 38 V input, with adjustable or fixed 3.3 V/5 V output, internal compensation, and 20 μA quiescent current in LCM mode. It targets industrial 24 V bus systems, smart meters, and always-on sensor nodes requiring high light-load efficiency or low-noise regulation.
For engineers reviewing the L6982NDR datasheet, L6982NDR pinout, L6982NDR application, or L6982NDR equivalent, key selection criteria include its dual-mode operation (LCM vs. LNM), VIN-compatible enable pin with wake-up threshold, SO-8L package thermal performance (RthJA = 55 °C/W), and integrated overvoltage/thermal/current protections enabling robust industrial deployment without external supervision circuitry.
Technical Context
The L6982NDR implements peak current mode control with internal slope compensation to prevent subharmonic oscillation, and features two distinct operational modes: Low Consumption Mode (LCM) for pulse-skipping at light loads (typ. 20 μA IQ), and Low Noise Mode (LNM) for forced PWM with constant 360–440 kHz switching frequency and external clock synchronization capability. Its embedded high-side (0.175 Ω RDS(on)) and low-side (0.125 Ω RDS(on)) MOSFETs eliminate external power switches.
Functional blocks include transconductance error amplifier with integrated compensation, pulse-by-pulse high-side/low-side current sensing for overcurrent protection, 1.3 ms internal soft-start, and analog ground (AGND) / power ground (PGND) separation to minimize noise coupling. The EN/CLKIN pin serves dual purpose: digital enable with 1.2 V threshold and, in LNM variants, 200–500 kHz external clock input with 2.3 V amplitude requirement.
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 12–36 V battery systems without pre-regulation. |
| Output Current | 2 A DC - sufficient to power microcontrollers, sensors, and communication ICs in decentralized nodes without external boost stages. |
| Quiescent Current (LCM) | 20 μA typical from VIN - enables multi-year battery life in always-on sensor applications with <100 μA system sleep current. |
| Switching Frequency | 360–440 kHz (LNM) - fixed-frequency operation minimizes EMI peaks and simplifies filter design for noise-sensitive instrumentation. |
| Feedback Reference | 0.85 V ±0.5% - precise reference enables accurate output regulation across temperature (−40 °C to 125 °C) using standard resistor dividers. |
| Thermal Protection | 165 °C shutdown with 30 °C hysteresis - prevents thermal runaway during overload or poor PCB heatsinking while allowing safe recovery. |
| Overvoltage Protection | 120% nominal trip (e.g., 6.0 V for 5 V output) - discharges output capacitor via low-side FET to protect downstream logic from transient overvoltage events. |
Pinout & Package
Package: SO-8L (Small Outline, 8-lead, exposed pad variant not specified; standard SO-8 footprint with PGND on pin 8 and AGND on pin 6).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switching node | Connects to inductor and bootstrap capacitor; carries high di/dt switching current - requires tight layout and Kelvin return path. |
| 2 BOOT | Bootstrap supply | Drives high-side gate via 100 nF capacitor between BOOT and SW; critical for maintaining NMOS gate drive above VIN during HS conduction. |
| 3 VCC | Analog supply rail | Powers internal bandgap, error amp, and logic; requires ≥1 µF ceramic bypass to stabilize reference and reduce noise sensitivity. |
| 4 FB/VOUT | Feedback input / Output sense | Monitors output voltage via resistor divider; 0.85 V reference sets VOUT = 0.85 × (1 + RH/RL) for adjustable versions. |
| 5 EN/CLKIN | Enable input / Clock sync | Digital enable with 1.2 V threshold; in LNM mode, accepts 200–500 kHz external clock to synchronize switching and reduce beat frequencies. |
| 6 AGND | Analog ground | Reference for feedback, error amp, and internal references; must be routed separately from PGND and joined 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); pin rated to 42 V absolute max for surge tolerance. |
| 8 PGND | Power ground | Return path for high-current switch node and low-side FET; must be low-inductance copper pour tied to AGND only at star point. |
Key Features
| Feature | Design Value |
|---|---|
| Internal compensation network | Eliminates need for external Type II/III compensation components - reduces BOM count and layout area while ensuring stability across 1–47 µF output capacitors. |
| Two operational modes (LCM/LNM) | LCM achieves >85% efficiency at 1 mA load; LNM maintains <10 mVPP ripple at light load with fixed frequency - selectable at part number level, not runtime configurable. |
| VIN-compatible enable pin | EN threshold of 1.2 V with 0.2 V hysteresis and 0.5 V wake-up level - allows direct interface with 3.3 V/5 V logic without level shifters and supports ultra-low-power wake-from-sleep sequencing. |
| Integrated overvoltage protection | Active discharge via low-side FET when FB exceeds 120% of setpoint - protects downstream 3.3 V/5 V logic from regulator fault or transient-induced overvoltage without external TVS. |
| Thermal and current protection | Pulse-by-pulse high-side/low-side current sensing (2.73 A peak / 2.2 A valley limits) plus 165 °C thermal shutdown - ensures reliable operation under short-circuit, overload, or ambient temperature extremes. |
Applications
| Industrial 24 V Power Systems | Smart Meters |
|---|---|
|
Use Scenario: Centralized or distributed power conversion in PLC I/O modules, motor drives, and fieldbus gateways powered from 24 V DC rails. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator supplying 3.3 V or 5 V to MCU, CAN transceivers, and analog front-ends. Use Value: Wide 3.5–38 V input range accommodates brownout and surge conditions per IEC 61000-4-5; 2 A output supports multi-rail local regulation without cascaded converters. |
Use Scenario: Metering units requiring long-term battery backup and precision analog measurement during mains failure. IC Role / Device Role / Timing Role: Always-on auxiliary supply generating stable 3.3 V from supercapacitor or LiSOCl₂ battery during grid outage. Use Value: 20 μA LCM quiescent current extends 10-year battery life; internal soft-start prevents inrush into metering ADC reference capacitors. |
| Sensors & Decentralized Nodes | Robot Cleaners |
|
Use Scenario: Battery-powered environmental sensors (temperature, humidity, gas) deployed in remote industrial sites with minimal maintenance. IC Role / Device Role / Timing Role: Efficient step-down from 3.6 V Li-ion or 24 V PoE-derived supply to 1.8 V/3.3 V sensor and BLE SoC rails. Use Value: Pulse-skipping LCM mode maintains >90% efficiency down to 100 μA load; EN pin enables MCU-controlled deep-sleep power gating. |
Use Scenario: Compact vacuum robot platforms requiring quiet, reliable power for navigation processors, motor drivers, and obstacle sensors. IC Role / Device Role / Timing Role: Low-noise 5 V supply for image signal processors and time-of-flight sensors sensitive to switching ripple. Use Value: LNM mode delivers <5 mVPP output ripple at 200 mA with MLCC output capacitor; synchronization eliminates beat interference with motor PWM clocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RGER | 4.5–60 V input, 3.5 A output, 15 μA IQ, no LNM mode, requires external compensation. | Better suited for higher input surges (e.g., automotive 42 V) but lacks synchronized low-noise operation for precision analog systems. | Select when >3 A output or >42 V surge immunity is required; avoid when EMI-sensitive imaging or metrology functions dominate. |
| TPS54202HDDCR | 4.5–28 V input, 2 A output, 26 μA IQ, no OVP, no thermal shutdown, requires external soft-start. | Lower cost but missing critical protections - unsuitable for unattended industrial deployments where fault containment is mandatory. | Consider only in cost-constrained consumer-grade designs with redundant system-level monitoring; not recommended for safety-critical or long-life equipment. |
Compared with LM61480RGER and TPS54202HDDCR, the L6982NDR uniquely combines industrial-grade protection (OVP, thermal, valley current limit), dual-mode efficiency/noise optimization, and full internal compensation - making it optimal for space-constrained, reliability-critical 24 V industrial nodes where design-in simplicity and field longevity are prioritized over raw current rating or ultra-wide VIN.
Availability
L6982NDR is available at Aetrix Electronics and suitable for industrial 24 V power systems, smart metering infrastructure, and battery-powered robotic platforms requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for L6982NDR 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 analog ICs for industrial, automotive, and IoT applications.
The L6982 belongs to ST's high-reliability DC-DC converter product line, designed specifically for ruggedized industrial power conversion where wide input range, low quiescent current, and integrated protection are non-negotiable for 10+ year deployments.
FAQ
What distinguishes L6982NDR from standard buck regulators in industrial settings?
The L6982NDR integrates overvoltage protection that actively discharges the output capacitor via its low-side FET, thermal shutdown with 30 °C hysteresis, and pulse-by-pulse valley current limiting - features rarely found together in monolithic 2 A buck regulators. Its SO-8L package delivers 55 °C/W junction-to-ambient thermal resistance on standard 2-layer PCBs, enabling operation up to 85 °C ambient without heatsinks in DIN-rail mounted enclosures.
Can L6982NDR operate with input voltages below 3.5 V?
No - the absolute minimum operating input voltage is 3.5 V as specified in the datasheet (DS13683 Rev 3, Table 6). Below this, the internal VCC LDO cannot regulate its 3.3 V supply, causing UVLO activation and disabling switching. For sub-3.5 V inputs, consider ST's L6983 series (1.8–5.5 V input) or discrete buck controller solutions.
How does the EN/CLKIN pin function differently in LCM versus LNM versions?
In all L6982 variants, EN/CLKIN provides enable/disable control with 1.2 V threshold. Only LNM versions (e.g., L6982NDR is LNM) support external clock synchronization: when EN is high, a 200–500 kHz square wave applied to this pin forces the internal oscillator to lock, eliminating switching frequency jitter and intermodulation noise - a capability absent in LCM parts like L6982IDR.
Is the L6982NDR pin-compatible with other ST buck regulators like L6983 or L6981?
No - L6982NDR uses an SO-8L package with unique pinout (e.g., SW on pin 1, BOOT on pin 2, AGND on pin 6, PGND on pin 8), whereas L6983 is in HTSSOP-16 and L6981 in SO-8 but with different pin assignments (e.g., PGND on pin 2, VIN on pin 8). Direct replacement requires PCB redesign and compensation network re-optimization due to differing internal architectures and compensation schemes.
L6982NDR 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 38V
- Voltage - Output (Min/Fixed):
- 0.85V
- Voltage - Output (Max):
- 38V
- 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
L6982NDR FAQ
1.How can I place an order for L6982NDR through Aetrix?
Please submit a Request for Quotation (RFQ) for L6982NDR 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 L6982NDR reliable?
The price and inventory of L6982NDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6982NDR is usually 5 days.
3.What payment methods are accepted for L6982NDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6982NDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L6982NDR?
L6982NDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L6982NDR 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 L6982NDR?
For technical support, including L6982NDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6982NDR requirements.
6.How does Aetrix verify that L6982NDR is sourced from the original manufacturer or authorized distributors?
All L6982NDR 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 L6982NDR meets industry standards.
7.What is the process for return or replacement of L6982NDR?
All L6982NDR units undergo pre-shipment inspection (PSI). If there is an issue with L6982NDR, 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 L6982NDR part is unused and in its original packaging.
Return procedure for L6982NDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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