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STMicroelectronics L6982CDR
- Part No.:
- L6982CDR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
L6982CDR.pdf
- Description:
- IC REG BUCK ADJ 2A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:6,875
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Product details
Overview
L6982CDR 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, 0.85 V to VIN adjustable output, and 20 μA quiescent current in LCM mode. It integrates peak current mode control, internal compensation, soft-start, overvoltage and thermal protection, and operates in either low-consumption (LCM) or low-noise (LNM) modes - used in industrial 24 V bus power supplies and always-on sensor nodes.
For engineers reviewing the L6982CDR datasheet, L6982CDR pinout, L6982CDR application, or L6982CDR equivalent, key selection criteria include light-load efficiency mode (LCM vs. LNM), EN/CLKIN dual-function pin behavior, SO 8L package thermal resistance (55 °C/W), and fixed 3.3 V or 5 V versus adjustable output configuration.
Technical Context
The L6982CDR implements peak current mode control with slope compensation to prevent subharmonic oscillation, featuring pulse-by-pulse high-side and valley current sensing for robust overcurrent protection across duty cycles. Its embedded transconductance error amplifier includes an internal compensation network, eliminating external components.
It supports two operational modes: LCM enables pulse-skipping at light loads for ultra-low IQ (20–60 μA), while LNM enforces constant-frequency PWM (360–440 kHz) with external clock synchronization capability (200–500 kHz) to minimize output voltage ripple in noise-sensitive applications like smart meters and robot cleaners.
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 Current | 2 A DC - sufficient for powering microcontrollers, sensors, and communication ICs in decentralized nodes. |
| Quiescent Current (LCM) | 20 μA typical from VIN - enables multi-year operation in battery-powered always-on applications. |
| Switching Frequency | 360–440 kHz (LNM) - fixed-frequency operation simplifies EMI filtering and allows external synchronization. |
| Feedback Reference | 0.85 V ±0.5% - enables precise output regulation from 0.85 V up to VIN using external resistor divider. |
| Shutdown Current | 2 μA - ensures minimal leakage when disabled via EN pin, critical for system-level power gating. |
| Thermal Shutdown | 165 °C with 30 °C hysteresis - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
Supplied in SO 8L (Small Outline, 8-lead) package with exposed thermal pad (not electrically connected), offering 55 °C/W junction-to-ambient thermal resistance on ST's reference board. Pinout optimized for compact layout with separated analog (AGND) and power (PGND) grounds and dedicated bootstrap (BOOT) and switching node (SW) routing.
| 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 ringing and EMI. |
| 2 BOOT | Bootstrap capacitor terminal | Connects to 100 nF ceramic capacitor between BOOT and SW to gate-drive the high-side NMOS during each cycle. |
| 3 VCC | Analog supply rail | Powers internal reference and error amplifier; requires ≥1 µF ceramic bypass capacitor to stabilize bandgap voltage. |
| 4 FB/VOUT | Feedback input / output sense | Monitors output voltage via resistor divider; sets regulated output as VOUT = 0.85 V × (1 + RFBH/RFBL). |
| 5 EN/CLKIN | Enable input / sync clock input | EN logic threshold: 1.2 V rising; in LNM versions only, accepts 200–500 kHz external clock for EMI reduction. |
| 6 AGND | Analog ground reference | Return path for VCC, FB, and internal analog circuitry; must be routed separately from PGND to avoid noise coupling. |
| 7 VIN | Main input supply | Accepts 3.5–38 V DC; connects to 10 µF input capacitor to suppress line transients and reduce RMS input current ripple. |
| 8 PGND | Power ground return | High-current return for internal MOSFETs and inductor; ties directly to input/output capacitors' ground planes. |
Key Features
| Feature | Design Value |
|---|---|
| Internal compensation network | Eliminates need for external Type II/III compensation components, reducing BOM count and layout area by ~30%. |
| Two light-load modes (LCM/LNM) | LCM achieves >85% efficiency at 1 mA load; LNM maintains <10 mVpp ripple at 200 kHz–1 MHz with constant fSW. |
| Synchronization input (LNM only) | Enables EMI reduction by locking switching frequency to system clock or adjacent converters, avoiding beat frequencies. |
| Overvoltage protection (OVP) | Triggers low-side MOSFET discharge at 120% nominal VOUT (e.g., 6.0 V for 5 V output), limiting fault energy transfer. |
| Integrated soft-start (1.3 ms) | Prevents inrush current surges into output capacitors, enabling safe hot-plug operation in modular systems. |
Applications
| Industrial 24 V Power Supply | Smart Meter Power Management |
|---|---|
|
Use Scenario: Primary DC-DC conversion in DIN-rail mounted PLC I/O modules powered from 24 V industrial bus. IC Role / Device Role / Timing Role: Main buck regulator supplying 3.3 V to MCU, CAN transceiver, and analog front-end. Use Value: 38 V max input withstands 40 V surge transients per IEC 61000-4-5; LCM mode extends battery backup runtime during brownout. |
Use Scenario: Always-on auxiliary supply in utility smart meters requiring decade-long battery life and low EMI. IC Role / Device Role / Timing Role: Secondary regulator deriving 3.3 V from main 5 V rail, powering real-time clock and metrology ADC. Use Value: 20 μA IQ in LCM mode reduces annual battery drain to <1.8 mAh; LNM option avoids interference with precision metrology sampling. |
| Robot Cleaner Motor Control Logic | Decentralized Sensor Node |
|
Use Scenario: Powering motor driver logic, IMU, and Wi-Fi SoC in battery-operated robotic vacuum cleaners. IC Role / Device Role / Timing Role: Point-of-load regulator stepping down 24 V battery to 5 V for MCU and peripherals. Use Value: SO 8L package enables compact layout near motor drivers; thermal shutdown (165 °C) prevents damage during stall conditions. |
Use Scenario: Compact environmental sensor node (temp/humidity/pressure) deployed in factory IoT networks. IC Role / Device Role / Timing Role: Single-chip power solution converting 24 V field bus to 3.3 V for ultra-low-power MCU and BLE radio. Use Value: Internal soft-start prevents brownout during wake-up bursts; EN pin enables MCU-controlled power cycling to extend node lifetime. |
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, 8 A output, 15 μA IQ, no internal compensation, requires external loop compensation. | Higher current capacity suits motor drivers; lacks LCM/LNM mode selection and OVP discharge function. | Select when >2 A output or programmable frequency is required; not drop-in due to compensation and pinout differences. |
| TPS54202HDDCR | 4.5–17 V input, 2 A output, 26 μA IQ, integrated FETs, no OVP, no sync input, 500 kHz fixed fSW. | Lower VIN range excludes 24 V bus use without pre-buck; no light-load mode flexibility or EN/CLKIN dual function. | Choose for cost-sensitive 12 V systems where 38 V tolerance and dual-mode operation are unnecessary. |
Compared with LM61480RQWR and TPS54202HDDCR, the L6982CDR uniquely combines 38 V input tolerance, selectable LCM/LNM operation, internal compensation, and integrated OVP discharge - making it optimal for ruggedized, low-noise, or battery-backed 24 V industrial applications.
Availability
L6982CDR is available at Aetrix Electronics and suitable for industrial 24 V bus power systems, smart meter auxiliary supplies, and robot cleaner motor control logic requiring stable component supply and long-term lifecycle support.
Supply support for L6982CDR 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, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.
The L6982 belongs to ST's high-voltage DC-DC converter product line, engineered specifically for robust, low-quiescent-power regulation in industrial automation, smart infrastructure, and battery-assisted equipment.
FAQ
What is the difference between L6982CDR and L6982IDR?
The L6982CDR is the commercial-grade version rated for –40 °C to +125 °C junction temperature, while the L6982IDR is the industrial-grade variant with identical electrical specs but extended qualification per AEC-Q100 stress testing. Both share the same SO 8L package, pinout, and functional features including LCM/LNM mode selection and EN/CLKIN dual functionality.
Can L6982CDR operate with 40 V input transient?
Yes - the absolute maximum VIN rating is 42 V per datasheet Table 3, and the device includes overvoltage protection that activates at 120% of nominal output. However, sustained operation above 38 V violates the recommended operating condition and may accelerate parametric drift or reduce reliability; external clamping is advised for 40 V transients.
Does the L6982CDR require external compensation components?
No - the L6982CDR integrates a complete Type II compensation network within the IC, eliminating external resistors and capacitors. This is confirmed in the Functional Description (Section 6) and Typical Application Circuits (Figures 3–4), where only input/output capacitors, inductor, and feedback resistors are shown.
How does the EN/CLKIN pin behave in LCM vs. LNM versions?
In all versions, EN/CLKIN serves as enable/disable with 1.2 V rising threshold. Only LNM versions (e.g., L6982LNMTR) accept external clock signals (200–500 kHz) on this pin; LCM versions (e.g., L6982LCMTR) ignore clock inputs and treat the pin solely as EN. The L6982CDR suffix indicates the commercial-grade part - its LCM/LNM variant must be verified from full part number (e.g., L6982CDR is LCM; L6982LDR is LNM).
L6982CDR 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
L6982CDR FAQ
1.How can I place an order for L6982CDR through Aetrix?
Please submit a Request for Quotation (RFQ) for L6982CDR 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 L6982CDR reliable?
The price and inventory of L6982CDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L6982CDR is usually 5 days.
3.What payment methods are accepted for L6982CDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L6982CDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L6982CDR?
L6982CDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L6982CDR 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 L6982CDR?
For technical support, including L6982CDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L6982CDR requirements.
6.How does Aetrix verify that L6982CDR is sourced from the original manufacturer or authorized distributors?
All L6982CDR 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 L6982CDR meets industry standards.
7.What is the process for return or replacement of L6982CDR?
All L6982CDR units undergo pre-shipment inspection (PSI). If there is an issue with L6982CDR, 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 L6982CDR part is unused and in its original packaging.
Return procedure for L6982CDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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