Monolithic Power Systems Inc. EV2690-R-01A

Overview

EV2690-R-01A from Monolithic Power Systems is an evaluation board for the MP2690GR IC, enabling rapid validation of all-in-one battery charge (up to 2.5A) and boost discharge (up to 2.1A) functionality in single-cell Li-ion/Li-Polymer systems. It implements dual-mode power path management-charge mode with programmable 4.2V/4.35V/4.45V termination and input-current limiting, and boost mode with regulated 5V SYS output-targeting portable power-bank and sub-battery applications.

For engineers reviewing the EV2690-R-01A datasheet, EV2690-R-01A pinout, EV2690-R-01A application, or EV2690-R-01A equivalent, this board provides verified reference design implementation, thermal shutdown protection, NTC-based battery temperature monitoring, LED-based fuel gauge indication, and USB-compliant load-detection logic for automatic boost activation.

Technical Context

The EV2690-R-01A implements a complete hardware reference for the MP2690's dual-path architecture: VIN-to-BATT switching regulation during charge mode (4.65–6V input, 2.5A max I_CHG, ±0.5% V_{BATT_FULL} accuracy), and BATT-to-SYS synchronous boost (3–4.5V battery input, 5V ±1% V_SYS, 2.1A I_SYS limit). It integrates discrete MOSFETs (M1–M3), current-sense resistors (RS1/RS2), and NTC biasing circuitry (RT1/RT2, R4/R5) to realize full system-level control without external microcontroller intervention.

Board-level features include jumper-selectable input detection (DCP/SDP1/SDP2), resistor-programmable limits (RILIM for I_{IN_LIM}, RISET for I_CHG, ROLIM for I_OLIM), PB-pin-triggered auto-boost via RC network (R11/C14), and four LEDs indicating battery voltage level and operating mode. All protections-input overvoltage, battery overvoltage, thermal shutdown, and programmable timer-are implemented per MP2690 specifications.

Key Specifications

Availability

EV2690-R-01A is available at Aetrix Electronics and suitable for power-bank development, portable medical device battery subsystem validation, and sub-battery backup systems requiring stable component supply, repeatable test conditions, and production-ready reference design fidelity.

Supply support for EV2690-R-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 analog and power ICs, with core expertise in DC/DC conversion, battery management, and motor control solutions.

The EV2690-R-01A belongs to MPS's evaluation board product line, designed specifically to accelerate adoption of the MP2690 family for compact, dual-role portable power systems requiring integrated charge + boost functionality without firmware dependency.

FAQ

What input voltage range does the EV2690-R-01A support in charge mode?

The board supports 4.65 V to 6 V input in charge mode, as defined by the MP2690's VIN specification. This range accommodates standard 5 V USB sources with tolerance for cable drop and ripple, while rejecting unstable or out-of-spec inputs via internal OVP circuitry.

How is automatic boost activation triggered on this evaluation board?

Automatic boost starts when a USB load is plugged into the SYS port (U3), grounding the VBUS shield and generating a falling edge on the PB pin via the R11/C14 RC network. This pulse enables the boost converter; M3 isolates PB after activation to prevent load-dependent instability.

Can the charge full voltage be adjusted, and how is it configured?

Yes-the charge termination voltage is selectable among 4.2 V, 4.35 V, or 4.45 V with ±0.5% accuracy. Configuration is done by connecting the VB pin to floating (4.2 V), L (ground, 4.35 V), or H (VCC, 4.45 V) using jumpers JP2.

What protections are implemented on the EV2690-R-01A board?

The board implements all MP2690-native protections: input overvoltage lockout (>6.5 V), battery overvoltage shutdown (>4.5 V), thermal shutdown (>150°C), battery temperature monitoring via NTC network (RT1/RT2, R4/R5), and programmable charge timer to prevent indefinite charging of deeply discharged cells.

Is the EV2690-R-01A compatible with real Li-ion batteries or only simulators?

It is fully compatible with both real single-cell Li-ion/Li-Polymer batteries and battery simulators. When using real cells, users must observe manufacturer-specified voltage, current, and temperature limits-e.g., never exceed 4.45 V charge voltage or 2.5 A charge current for cells rated ≤2.5 A max charge rate.

Does the board support USB Battery Charging (BC) 1.2 detection?

Yes-the DCP/SDP1/SDP2 jumpers configure DP1/DM1 detection logic per USB BC 1.2. With DCP jumper installed, the board identifies dedicated chargers and sets input current limit via RILIM; floating all three defaults to 500 mA I_{IN_LIM}.

What is the role of the four LEDs on the board?

LED1–LED4 form a voltage-based fuel gauge: LED states map linearly to battery voltage (e.g., LED1 on at ≥3.25 V, all four on at ≥4.0 V). Color coding distinguishes modes-green LEDs indicate charge mode; red LEDs indicate boost mode-as controlled by MP2690's internal status registers.