Monolithic Power Systems Inc. EV2631DQ-00A

Overview

EV2631DQ-00A from Monolithic Power Systems is an evaluation board for the MP2631DQ linear Li-ion battery charger IC, integrating a 5V/10mA high-voltage LDO, reverse-polarity protection, and programmable 200–1000mA charge current. It supports single-cell Li-Po/Li-Ion charging with CC/CV regulation, auto-recharge, and OVP-triggered input disconnect above 7V.

For engineers reviewing the EV2631DQ-00A datasheet, EV2631DQ-00A pinout, EV2631DQ-00A application, or EV2631DQ-00A equivalent, this board enables rapid validation of MP2631DQ-based charging systems in portable electronics requiring robust surge tolerance (±28V/−16V), precise 0.75% battery voltage accuracy, and dual-status LED feedback.

Technical Context

The EV2631DQ-00A implements the MP2631DQ IC in a fully assembled QFN10 evaluation platform with preconfigured 4.2V battery termination, selectable charge current via 3×2-pin jumpers (JP1–JP3), and dual-color LED indicators for input presence (green) and active charging (red). All passive components-including 4.7µF/35V input capacitor (C1), 2.2µF output cap (C4), and precision 1% current-setting resistors (R3–R5)-are populated per Rev. 1.0 schematic.

It operates from 4.5V to 6.5V DC input, delivers regulated 5V/10mA LDO output, and provides real-time status signaling through ACOK (input OK) and CHG (charging active) pins routed to LEDs and test points. The board includes no-stuff option R6 for optional thermal monitoring.

Key Specifications

Availability

EV2631DQ-00A is available at Aetrix Electronics and suitable for portable power design validation, battery management system prototyping, and Li-ion charging circuit qualification requiring stable component supply, traceable reference hardware, and manufacturer-verified performance.

Supply support for EV2631DQ-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 chargers, and motor drivers.

The MP2631 product line targets space-constrained portable electronics needing integrated, surge-tolerant Li-ion charging with auxiliary LDO functionality-designed specifically for smartphones, digital cameras, and PDAs where input robustness and battery accuracy are critical.

FAQ

What is the purpose of the JP1–JP3 jumpers on EV2631DQ-00A?

The JP1–JP3 3×2-pin headers configure the MP2631DQ's charge current by selecting different ISET resistor paths (R3=1.96kΩ, R4=3.09kΩ, R5=7.68kΩ). Per the quick-start guide, jumper combinations yield discrete ICHG values: 200mA, 500mA, 700mA, 800mA, or 1000mA-enabling rapid testing across common battery capacity ranges without soldering.

Does EV2631DQ-00A support charging without a battery connected?

Yes. The board safely idles with no battery: LED1 remains on if VIN is applied, while LED2 stays off. The MP2631DQ IC internally blocks reverse current (<1µA) and disables charging when BAT pin voltage falls below trickle threshold (~2.8V); OVP still protects VIN up to 7V regardless of battery presence.

Can the LDO output be used independently of the charger function?

Yes. The 5V LDO output (pin LDO) is powered directly from VIN and remains active as long as input voltage is within 4.5–6.5V, irrespective of battery connection, charge state, or CHG pin activity. Its 10mA rating supports low-power peripherals like sensors or logic rails in battery-backed systems.

What is the role of the ACOK signal on this evaluation board?

ACOK (pin 6 of U1) is an open-drain output that asserts low when valid input voltage (≥4.5V) is detected and the internal OVP circuit is not tripped. On EV2631DQ-00A, it drives LED1 (green) through a current-limiting resistor, providing immediate visual confirmation of proper adapter connection and input health before charging initiates.

Is thermal management implemented on this board?

The EV2631DQ-00A relies on the MP2631DQ's internal die temperature limiting (thermal foldback) rather than external heatsinking. The QFN10 package is soldered to a 2-layer PCB with exposed thermal pad connected to internal ground planes. No thermal vias or copper pours beyond the reference layout are added-designers must verify junction temperature under worst-case 1A charge + LDO load in their end application.

How is battery voltage accuracy verified on this board?

Battery voltage accuracy is maintained by the MP2631DQ's internal 0.75% reference and feedback network. On EV2631DQ-00A, the BAT pin connects directly to the battery terminal with minimal trace resistance; no external divider or calibration components are used. Accuracy is validated per MPS datasheet test conditions (TJ = 25°C, VIN = 5V, ICHG = 500mA) and holds across −40°C to +85°C per specification.