Monolithic Power Systems Inc. EV2605DQ-00B

Overview

EV2605DQ-00B from Monolithic Power Systems is a fully assembled and tested evaluation board for the MP2605DQ linear single-cell Li-ion battery charger IC, supporting 5V input, 0.8A programmable charge current, 4.2V CV regulation, and integrated thermal/NTC-based temperature monitoring for portable electronics power management.

For engineers reviewing the EV2605DQ-00B datasheet, EV2605DQ-00B pinout, EV2605DQ-00B application, or EV2605DQ-00B equivalent, this board enables rapid validation of CC/CV charging behavior, adapter power-good signaling, battery full termination, and RSET-based current programming across 200mA–1A range under real thermal and load conditions.

Technical Context

The EV2605DQ-00B implements the MP2605DQ's full functional interface: ACOK (input power-good), CHG (charge status), NTC (battery thermistor sensing), ISET (RSET-programmable current), TMR (timer capacitor connection), and BAT (battery terminal). It supports 28V surge-tolerant 5V input via integrated over-voltage protection.

Board-level features include dual-color LED indicators (green = VIN present, red = charging active), jumper-selectable charge current (200/500/700/800/1000 mA), and pre-populated 2.2µF timer capacitor setting 5Hz oscillator frequency per MP2605DQ specification.

Key Specifications

Availability

EV2605DQ-00B is available at Aetrix Electronics and suitable for battery management validation, portable power subsystem integration, and Li-ion charging algorithm development requiring stable component supply and documented reference design fidelity.

Supply support for EV2605DQ-00B 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, LED drivers, and motor drivers.

The MP2605 product line delivers highly integrated linear Li-ion chargers for space-constrained portable devices, emphasizing robust input surge tolerance, precise voltage regulation, and comprehensive battery safety monitoring.

FAQ

What input voltage does the EV2605DQ-00B accept?

The board operates at 5 V nominal input, compliant with USB and standard AC adapter sources. Its underlying MP2605DQ IC integrates proprietary over-voltage protection enabling safe operation during transient surges up to 28 V-no external TVS required.

How is charge current programmed on this evaluation board?

Charge current is selected using three 2-pin jumpers (JP1, JP2, JP3) per the Quick Start Guide table. Each jumper combination connects specific RSET resistors (e.g., R6 = 3.6 kΩ for 700 mA, R7 = 8.66 kΩ for 200 mA), directly configuring the MP2605DQ's ISET pin current.

Does the board provide battery temperature monitoring capability?

Yes-the board includes an NTC thermistor interface (U1 Pin 2) and routing for external NTC placement. The MP2605DQ monitors NTC voltage to enable temperature-dependent charge suspension, supporting JEITA-compliant charging profiles when paired with appropriate thermistor circuitry.

What do the green and red LEDs indicate?

Green LED (LED1) illuminates when 5 V input is applied and ACOK signal is asserted. Red LED (LED2) turns on only during active constant-current or constant-voltage charging; it extinguishes upon battery full termination, fault condition, or no battery connection.

Is the EV2605DQ-00B compatible with other MP2605 variants?

Yes-it is designed specifically for the MP2605DQ (QFN-10 package), as confirmed by BOM and schematic. Other MP2605 suffixes (e.g., MP2605DN) use different packages or pinouts and are not mechanically or electrically compatible with this board layout.

Can the timer timeout be adjusted?

Yes-C5 (2.2 µF) sets the default 5 Hz oscillator frequency. Per the formula F_osc = 5 / (C_F × 2.2 µF), replacing C5 with another value (e.g., 1 µF yields ~11.4 Hz) changes the internal timer clock and thus charge timeout duration.