Monolithic Power Systems Inc. EV2661-C-00A

Overview

EV2661-C-00A from Monolithic Power Systems is an evaluation board for the MP2661 linear battery charger IC, designed to validate power path management and programmable charging of single-cell Li-ion/Li-polymer batteries. It supports autonomous CC/CV charging (8–535 mA), input voltage regulation (4.6–5.5 V), 0.5% battery voltage accuracy (3.60–4.545 V), I²C-based parameter configuration, and system-level short-circuit/UVLO protection in wearable and smart handheld applications.

For engineers reviewing the EV2661-C-00A datasheet, EV2661-C-00A pinout, EV2661-C-00A application, or EV2661-C-00A equivalent, this board enables rapid validation of MP2661's USB/adapter dual-input power path, programmable charge termination, battery disconnect control, thermal monitoring via NTC, and I²C register-level tuning of input current limit, charge voltage, UVLO threshold, and safety timers.

Technical Context

The EV2661-C-00A implements a complete reference design for the MP2661GC-0000 WCSP-packaged charger IC, featuring integrated power FETs, analog sensing circuitry, and an I²C interface routed to a 5-pin header. It validates simultaneous system powering and battery charging with automatic source selection between VIN, battery, or both - critical for uninterrupted operation in space-constrained portable devices.

Board-level implementation includes discrete passive BOM (GRM188R71E105KA12D, GRM21BR71E225KA73L, GRM31CR71E475KA88L capacitors; RC0603FR-07100KL/RC0603FR-0710KL resistors), micro-B USB connector (U2), and NTC thermistor support. The default firmware configures 4.200 V full-charge voltage, 246 mA CC current, and 2.8 V UVLO threshold per MP2661 register map Rev. 1.0.

Key Specifications

Availability

EV2661-C-00A is available at Aetrix Electronics and suitable for wearable device development, smart watch reference design validation, and fitness accessory battery subsystem integration requiring stable component supply and fast-turn evaluation capability.

Supply support for EV2661-C-00A 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 analog and power ICs, with core expertise in DC/DC converters, battery management, and motor drivers.

The MP2661 product line delivers highly integrated linear chargers with power path management for ultra-compact portable electronics - enabling continuous system operation during charging while minimizing external component count and PCB area.

FAQ

What power sources can be used with the EV2661-C-00A?

The board accepts regulated 4.6–5.5 V input from either a standard USB port (via micro-B connector) or an external DC adapter. Input voltage regulation is enforced by the MP2661's internal loop, and the board routes VIN directly to the IC's input pin without additional conditioning circuitry.

Does the EV2661-C-00A support battery temperature monitoring?

Yes - the board includes pads and routing for an NTC thermistor (RT1/RT2 positions), and the MP2661 IC supports NTC-based battery temperature supervision. Configuration is done via I²C register EN_PCB_OTP bit; when enabled, it activates PCB-level overtemperature protection independent of battery thermistor input.

How is charge termination configured on this evaluation board?

Termination is programmable via I²C registers: users select between battery full (EN_BF) or timer-based (TERM_TMR) methods. Default setting uses EN_BF = 1, terminating charge when battery current drops below IBF threshold in CV mode - verified in the factory-default MP2661GC-0000 configuration.

Can the EV2661-C-00A operate without a host PC or I²C connection?

Yes - the board powers up in autonomous mode with factory-default register settings (4.200 V charge voltage, 246 mA CC, 2.8 V UVLO). All charging functions operate stand-alone; I²C is required only for reconfiguration, status monitoring, or fault diagnostics.

What is the role of the INT pin on the I²C header?

The INT pin is an open-drain interrupt output from the MP2661 that asserts low on events including charge completion, fault conditions (overvoltage, overtemperature), or register-access timeouts. It connects directly to the I²C header and may be pulled up externally or monitored by host MCU GPIO.

Is the EV2661-C-00A RoHS-compliant and halogen-free?

Yes - all components on the board, including the MP2661GC-0000 IC and passive parts (muRata GRM series, Yageo resistors), are lead-free, halogen-free, and compliant with EU RoHS Directive 2011/65/EU, as confirmed in MPS documentation Rev. 1.0 and manufacturer declarations.