STMicroelectronics STEVAL-ISA076V1

Overview

STEVAL-ISA076V1 from STMicroelectronics is a battery charger demonstration board based on the L6924D monolithic Li-Ion/Li-Polymer charger IC, featuring integrated power MOSFET, reverse-blocking diode, current-sense resistor, and thermal control circuitry. It supports linear and quasi-pulse charging modes, programmable 4.1 V or 4.2 V output (±1% accuracy), up to 1 A fast-charge current, and NTC/PTC thermistor interface for battery temperature monitoring - deployed in handheld devices and digital cameras.

For engineers reviewing the STEVAL-ISA076V1 datasheet, STEVAL-ISA076V1 pinout, STEVAL-ISA076V1 application, or STEVAL-ISA076V1 equivalent, key selection considerations include input voltage range (up to 12 V), dual-mode operation (linear vs. quasi-pulse), programmable charge termination thresholds, thermal protection architecture, and status LED/host interface signaling capability.

Technical Context

The board implements the L6924D's CC/CV charging profile with automatic mode switching: linear regulation when powered by a voltage-regulated adapter, and quasi-pulse operation under current-limited supply to reduce thermal stress. Charge sequencing is controlled via multifunction pins supporting timer-based, current-based, and temperature-based termination.

Thermal management integrates closed-loop feedback using an external NTC or PTC thermistor, enabling real-time battery temperature monitoring and dynamic charge current derating. Status outputs provide discrete signals for CHG_OK, FAULT, and THERM, compatible with LED drivers or host microcontroller GPIOs.

Key Specifications

Availability

STEVAL-ISA076V1 is available at Aetrix Electronics and suitable for battery management validation, portable device prototyping, and embedded power system integration requiring stable component supply and documented reference design support.

Supply support for STEVAL-ISA076V1 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 MEMS sensors for industrial, automotive, and consumer applications.

The STEVAL evaluation board series delivers application-specific reference designs built around ST's proprietary power management ICs - engineered to accelerate development of energy-efficient, thermally robust, and safety-compliant battery systems.

FAQ

What input power sources are supported by the STEVAL-ISA076V1?

The board accepts regulated DC inputs up to 12 V for linear-mode operation and current-limited DC inputs for quasi-pulse mode. It is designed for compatibility with standard 5 V USB adapters and 9–12 V wall adapters, with internal circuitry automatically selecting the optimal charging mode based on input characteristics.

Does the STEVAL-ISA076V1 support battery temperature monitoring?

Yes - it features dedicated circuitry for connecting NTC or PTC thermistors to monitor battery temperature in real time. The L6924D IC uses this input to dynamically adjust charge current and terminate charging if temperature exceeds user-defined thresholds, meeting IEC 62133 safety requirements.

Can the charge voltage threshold be changed between 4.1 V and 4.2 V?

Yes - the output voltage is selectable via a hardware jumper (JP1) on the board. Configuring JP1 connects the L6924D's VREF_SEL pin to either GND or VCC, setting the final charge voltage to 4.1 V or 4.2 V respectively, both with ±1% accuracy over temperature and load.

What status indicators does the board provide?

The board provides three discrete open-drain status outputs: CHG_OK (active during valid charging), FAULT (asserted on overvoltage, overtemperature, or battery absence), and THERM (activated when temperature limits are breached). These drive onboard LEDs and can be directly interfaced with a host microcontroller's GPIO pins.