STMicroelectronics STEVAL-ISA076V2

Overview

STEVAL-ISA076V2 from STMicroelectronics is an evaluation board for the L6924U monolithic linear/quasi-pulse battery charger IC, designed to demonstrate single-cell Li-Ion/Li-Polymer charging from USB or AC adapter inputs. It implements full CC/CV charging, programmable current up to 1 A (AC mode) or 500 mA (USB high-power), ±1% 4.2 V regulation, thermal foldback, NTC/PTC temperature monitoring, and dual status outputs - validated on a compact PCB with VFQFPN16 footprint and layout-optimized thermal management.

For engineers reviewing the STEVAL-ISA076V2 datasheet, STEVAL-ISA076V2 user manual, STEVAL-ISA076V2 schematic, or STEVAL-ISA076V2 BOM, this page provides verified functional context, measured performance boundaries, pin-compatible reference design guidance, thermal validation data, and OEM-ready supply chain support for portable power subsystem development.

Technical Context

The STEVAL-ISA076V2 implements the L6924U's dual-input architecture with hardware-selectable AC/USB priority via MODE and ISEL pins, enabling seamless transition between regulated (linear) and current-limited (quasi-pulse) input sources. Its PCB layout incorporates dedicated Kelvin sensing (VOSNS/VOUT separation), low-inductance power paths, and thermally enhanced copper pour under the VFQFPN16 package to sustain >0.6 W dissipation at ambient ≤60 °C.

It validates real-world operation of all L6924U control loops: closed-loop thermal regulation (junction clamp at ~120 °C), gas-gauge–enabled charge termination (IEND resistor feedback), programmable pre-charge (VPRETH = 3.0 V), and adaptive end-of-charge timing (TPRG capacitor-based 3-hour max timer). All status outputs (ST1/ST2) are routed to LEDs and test points for direct visual and oscilloscope verification.

Key Specifications

Availability

STEVAL-ISA076V2 is available at Aetrix Electronics and suitable for GPS trackers, USB-powered medical sensors, digital still cameras, and wireless headsets requiring stable component supply, rapid prototyping validation, and production-ready reference design reuse.

Supply support for STEVAL-ISA076V2 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, Switzerland, specializing in automotive, industrial, and power management solutions with broad IP in analog, mixed-signal, and embedded processing.

The STEVAL-ISA076V2 belongs to ST's ST EVAL series of application-specific evaluation boards, engineered to accelerate time-to-prototype for battery-powered portable electronics by delivering fully tested, layout-validated, and documentation-rich reference designs.

FAQ

What input voltage ranges does STEVAL-ISA076V2 support?

The board supports 2.5 V to 12 V DC input, covering standard USB 5 V (±5%), 5 V wall adapters, and higher-voltage AC-DC supplies. Input voltage tolerance is validated per L6924U absolute maximum ratings (−0.3 V to 16 V), with safe linear operation above 4.1 V start-up threshold and quasi-pulse capability down to 2.5 V.

Can STEVAL-ISA076V2 be used to validate thermal performance in enclosure designs?

Yes - the board integrates thermal vias and 2 oz copper under the L6924U VFQFPN16 package, enabling direct junction temperature measurement via on-die thermal sensor output. Measured R_thJA is 75 °C/W on the demo board, allowing engineers to correlate thermal rise under 1 A fast-charge load with their mechanical housing airflow and material constraints.

Does STEVAL-ISA076V2 include battery presence detection circuitry?

Yes - it implements the L6924U's differentiated VOUT/VOSNS sensing scheme: a small current is forced through VOUT while VOSNS monitors return voltage. If no battery is connected, VOSNS fails to detect expected voltage drop, triggering standby mode. This is verified on-board with LED indicators and accessible test points.

How is USB vs. AC adapter mode selected on STEVAL-ISA076V2?

Mode selection is implemented via a jumper (JP1) connecting the MODE pin to GND (AC mode) or V_IN (USB mode). In USB mode, a second jumper (JP2) sets ISEL high (500 mA) or low (100 mA), directly configuring the L6924U's internal current scaling without external resistor changes.