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STMicroelectronics STEVAL-L6981CDR
- Part No.:
- STEVAL-L6981CDR
- Manufacturer:
- STMicroelectronics
- Package:
- Datasheet:
-
STEVAL-L6981CDR.pdf
- Description:
- EVAL BOARD L6981CDR L6983CQTR
- Quantity:
- Payment:
- Shipping:
Inventory:3,585
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Product details
Overview
STEVAL-L6981CDR from STMicroelectronics is an evaluation board built around the L6981CDR synchronous step-down DC-DC converter, delivering 1.5 A at output voltages adjustable from 0.85 V to VIN, operating across 3.5 V–38 V input, and housed in an SO-8 package for industrial power systems.
For engineers reviewing the STEVAL-L6981CDR datasheet, STEVAL-L6981CDR pinout, STEVAL-L6981CDR application, or STEVAL-L6981CDR equivalent, key selection factors include its LCM-mode efficiency optimization, 2 μA shutdown current, internal soft-start, EN/SYNC dual-function pin, and synchronization capability with external clock for noise-sensitive designs.
Technical Context
The board implements peak current mode control using the L6981CDR IC, which integrates internal compensation and supports both low-consumption mode (LCM) and low-noise mode (LNM). It features pulse-by-pulse current sensing on high- and low-side MOSFETs for constant-current protection and thermal shutdown for safe operation.
EN/SYNC pin enables device startup and allows external clock synchronization in LNM mode; internal 1.3 ms soft-start prevents inrush current; overvoltage protection safeguards downstream circuitry; and output voltage sequencing supports multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 38 V - supports wide-range industrial and automotive battery-fed inputs. |
| Output Current | 1.5 A DC - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Output Voltage Range | 0.85 V to VIN - enables regulation down to sub-1 V for modern low-voltage logic rails. |
| Shutdown Current | 2 μA - minimizes battery drain in always-on or standby systems. |
| Soft-Start Time | 1.3 ms typical - limits inrush current during power-up without requiring external components. |
| Protection Features | Overvoltage, thermal shutdown, and pulse-by-pulse current limiting - ensures robust operation under fault conditions. |
Availability
STEVAL-L6981CDR is available at Aetrix Electronics and suitable for industrial power systems, battery-powered instrumentation, and multi-rail embedded controllers requiring stable component supply and rapid prototyping support.
Supply support for STEVAL-L6981CDR 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, MCU, power, and sensor solutions for industrial, automotive, and consumer applications.
The STEVAL-L6981CDR belongs to ST's evaluation board portfolio for DC-DC converters, specifically intended to accelerate design-in of the L6981 series in industrial power supplies and battery-operated equipment.
FAQ
What is the primary function of the STEVAL-L6981CDR evaluation board?
The STEVAL-L6981CDR is a fully assembled and tested evaluation platform for the L6981CDR synchronous step-down regulator. It enables engineers to validate performance-including efficiency, transient response, and sequencing-under real-world load and input conditions before final system integration.
Does the board support both LCM and LNM modes of the L6981CDR?
Yes - the board is configured for the L6981CDR in low-consumption mode (LCM), but its EN/SYNC pin and layout accommodate external clock injection to operate in low-noise mode (LNM), as confirmed by the schematic and DB4407 data brief revision notes.
Can the output voltage be adjusted, and how is it set on this board?
Yes - output voltage is set via resistor divider on FB pin (U1 pin 4); the default configuration delivers a fixed output, but R1 (0 Ω) and feedback network positions (R2, R3) allow reconfiguration to any value between 0.85 V and VIN per the L6981CDR's reference voltage of 0.8 V.
What external components are required to operate the STEVAL-L6981CDR?
No external components are required - the board includes all necessary input/output capacitors (C1–C14), power inductors (L1–L4), ferrite bead (L3), and feedback resistors. Only input power (3.5–38 V) and optional SYNC signal need connection to begin evaluation.
STEVAL-L6981CDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Main Purpose:
- DC/DC, Step Down
- Outputs and Type:
- 1 Non-Isolated Output
- Voltage - Output:
- -
- Current - Output:
- 0.85V
- Voltage - Input:
- 1.5A
- Regulator Topology:
- 3.5V ~ 38V
- Frequency - Switching:
- Buck
- Contents:
- 400kHz
- Utilized IC / Part:
- Board(s)
- Power - Output:
- L6981CDR, L6983CQTR
STEVAL-L6981CDR FAQ
1.How can I place an order for STEVAL-L6981CDR through Aetrix?
Please submit a Request for Quotation (RFQ) for STEVAL-L6981CDR 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 STEVAL-L6981CDR reliable?
The price and inventory of STEVAL-L6981CDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STEVAL-L6981CDR is usually 5 days.
3.What payment methods are accepted for STEVAL-L6981CDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STEVAL-L6981CDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STEVAL-L6981CDR?
STEVAL-L6981CDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STEVAL-L6981CDR 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 STEVAL-L6981CDR?
For technical support, including STEVAL-L6981CDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STEVAL-L6981CDR requirements.
6.How does Aetrix verify that STEVAL-L6981CDR is sourced from the original manufacturer or authorized distributors?
All STEVAL-L6981CDR 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 STEVAL-L6981CDR meets industry standards.
7.What is the process for return or replacement of STEVAL-L6981CDR?
All STEVAL-L6981CDR units undergo pre-shipment inspection (PSI). If there is an issue with STEVAL-L6981CDR, 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 STEVAL-L6981CDR part is unused and in its original packaging.
Return procedure for STEVAL-L6981CDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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