STMicroelectronics STEVAL-L6982CDR

Overview

STEVAL-L6982CDR from STMicroelectronics is an evaluation board built around the L6982CDR synchronous step-down DC-DC converter, delivering up to 2 A at adjustable output (0.85 V–VIN) or fixed 3.3 V/5 V, operating from 3.5 V to 38 V input, featuring low-quiescent-current LCM mode and SO 8L packaging-used for validating power supply designs in industrial tools and battery-powered systems.

For engineers reviewing the STEVAL-L6982CDR datasheet, STEVAL-L6982CDR pinout, STEVAL-L6982CDR application, or STEVAL-L6982CDR equivalent, this board enables rapid characterization of the L6982CDR's light-load efficiency, enable-controlled startup, internal soft-start timing, overvoltage protection behavior, and external clock synchronization capability in real PCB layouts.

Technical Context

The STEVAL-L6982CDR implements peak current mode control with internal compensation, eliminating need for external loop components. It supports two operational modes: Low Consumption Mode (LCM) for <100 µA quiescent current at light load and optimized battery runtime, and Low Noise Mode (LNM) for constant-frequency operation and minimized output ripple across full load range.

Board-level features include EN/SYNC pin routing for enable control or external clock synchronization, dedicated test points (TP1–TP6) for VIN, VOUT, EN, CLK_IN, and GND, and provisioned EMI filtering components (MPZ2012S221A ferrite bead, optional C8/C9), enabling noise-sensitive system validation.

Key Specifications

Availability

STEVAL-L6982CDR is available at Aetrix Electronics and suitable for industrial power tools, portable medical instrumentation, and 24 V–36 V battery-powered embedded systems requiring stable component supply and fast design validation cycles.

Supply support for STEVAL-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 microcontrollers, analog ICs, power management devices, and sensors for industrial, automotive, and consumer markets.

The STEVAL-L6982CDR belongs to ST's high-voltage DC-DC evaluation platform family, engineered to accelerate adoption of their L6982 series regulators in rugged, wide-input applications where efficiency, noise control, and reliability are design-critical.

FAQ

What is the purpose of the CLK_IN test point on STEVAL-L6982CDR?

The CLK_IN test point (TP2) connects to the EN/SYNC pin of the L6982CDR IC and allows external clock injection to synchronize switching frequency in LNM mode. This reduces beat frequencies in multi-rail systems and improves EMI predictability-confirmed in DB4478 schematic and functional description.

Can STEVAL-L6982CDR be used to evaluate both LCM and LNM versions of the L6982?

No-STEVAL-L6982CDR is specifically configured for the L6982CDR (LCM version). The LNM variant (L6982NDR) requires different internal oscillator settings and is evaluated on separate boards like STEVAL-L6982NDR; mixing modes is not supported by this hardware.

How is output voltage adjusted on this evaluation board?

Output voltage is set via resistor divider R2 (0 Ω) and R3 (82.5 kΩ) connected to FB pin, yielding ~3.3 V with default components. Adjusting R3 changes feedback ratio; full 0.85 V–VIN range is achievable per L6982CDR datasheet, validated using TP6 and onboard test points.

Does the board include EMI filtering components for conducted emissions testing?

Yes-C8 (10 pF), L3 (MPZ2012S221A ferrite bead), and optional C9 provide basic high-frequency filtering on VIN path. These are explicitly labeled "EMI Filters. Optional Components" in DB4478 schematic and intended for pre-compliance radiated/conducted emission assessment.