Monolithic Power Systems Inc. EV2650-V-01A

Overview

EV2650-V-01A from Monolithic Power Systems is an evaluation board for the MP2650 buck/boost battery charger IC, supporting 2S–4S Li-ion/Li-polymer battery packs with NVDC power path management and USB OTG functionality. It integrates the MP2650GV QFN-30 (4mm × 5mm) IC, accepts 4–21V input, delivers up to 5A charge current, and provides configurable 5V/3A OTG output. The board enables full I²C-based configuration of charge parameters (VBATT_REG, ICC, IIN_LIM), safety timers, JEITA thermal profiles, and PROCHOT/PSYS monitoring - validated for use in portable medical devices, rugged tablets, and industrial handhelds.

For engineers reviewing the EV2650-V-01A datasheet, EV2650-V-01A pinout, EV2650-V-01A application, or EV2650-V-01A equivalent, this board serves as a production-ready reference platform for validating MP2650-based charging architectures - including automatic buck/boost mode selection, real-time ADC-monitored voltage/current/power telemetry, and I²C register-level control of NVDC behavior, OTG enablement, and fault reporting via status registers.

Technical Context

The EV2650-V-01A implements the MP2650's dual-mode switching architecture: boost mode activates at low VIN (e.g., 5V input into 2S–4S), while buck mode engages at higher VIN (≥9V into 2S, ≥12V into 3S). Its layout incorporates Kelvin-sense routing for the 10mΩ input current-sense resistor (R1), dedicated AGND/PGND separation per MPS layout guidelines, and optimized thermal pad grounding for the MP2650GV's exposed die paddle.

It supports full functional validation of the MP2650's integrated features: I²C-configurable charge termination (EN_BF), auto-recharge thresholds (VBATT_REG − VRECH_OS × cell count), NTC-based JEITA compliance (NTC_WARM/COOL, JEITA_ISET/VSET), and system-level protection (PROCHOT assertion on VSYS_UV, IIN_OCP, or discharge overcurrent).

Key Specifications

Availability

EV2650-V-01A is available at Aetrix Electronics and suitable for portable medical monitors, ruggedized tablet PCs, and industrial handheld terminals requiring stable component supply, rapid firmware validation, and production-grade charging architecture verification.

Supply support for EV2650-V-01A 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs, with expertise in integrated DC/DC converters, battery chargers, and motor drivers for consumer, industrial, and automotive markets.

The MP2650 product line targets space-constrained, multi-cell battery-powered systems requiring seamless power path arbitration between adapter, battery, and system rail - delivering NVDC operation, USB OTG capability, and comprehensive I²C configurability without external discrete components.

FAQ

What software and hardware are required to operate the EV2650-V-01A?

The board requires the MP2650 Evaluation Kit software (Windows XP/7/10/11 compatible), the EVKT-USBI2C-02 USB-to-I²C adapter, a 4–21V DC input supply, a 2S–4S battery pack or simulator, and a PC with USB port. All configuration, real-time telemetry, and register writes occur through the GUI - no external programming tools are needed.

How does the board handle automatic buck/boost mode selection?

Mode selection is fully autonomous and determined by VIN and battery cell count per Table 1 in the user guide: e.g., 5V input triggers boost mode for all cell counts (2S–4S), while 12V input forces buck mode for 2S only. The MP2650GV internally manages gate drive sequencing, current sensing, and loop compensation - no manual intervention or firmware logic is required.

Can the EV2650-V-01A be used to validate JEITA-compliant charging?

Yes - the board includes NTC circuitry (RT1/RT2, SW1/SW2 configured as VNTC/NTC) and supports full JEITA profile configuration via I²C registers: NTC_WARM/COOL thresholds, JEITA_ISET (low-temp current limit), and JEITA_VSET (high-temp voltage limit). Temperature sweep tests (rising/falling) are documented in Section 17 of the user guide.

What is the role of the PROCHOT and PSYS functions on this board?

PROCHOT asserts to throttle host processors during thermal or electrical faults; PSYS reports real-time system power (VSYS × ISYS). Configuration includes VSYS_UV, IIN_OCP, and discharge overcurrent thresholds (DIS_OC), plus debounce/duration timing (VSYS_TDB, TDUR). These signals are routed to U1 pins PCHOT and PSYS and monitored via GUI ADC readouts.

Is the board capable of measuring battery impedance compensation effects?

Yes - the GUI includes "Battery Impedance Compensation" controls (BATTTR resistance, VCLAMP max regulated voltage) that directly configure REG0Ah and REG0Bh. Test waveforms in Section 15 validate voltage droop correction under load transients, confirming the MP2650GV's ability to maintain precise VBATT_REG despite internal battery ESR.

Does the EV2650-V-01A support watchdog timer functionality?

Yes - the MP2650GV includes an I²C-configurable watchdog (REG0Ch) with programmable timeout, auto-reset enable, and manual reset trigger. The GUI exposes all settings (Rate, Watchdog AUTO Reset checkbox) and provides a "Watchdog Reset" button - critical for validating fail-safe behavior in mission-critical portable applications.