Monolithic Power Systems Inc. EV26057DQ-00A

Overview

EV26057DQ-00A from Monolithic Power Systems is an evaluation board for the MP26057DQ linear Li-ion battery charger IC, supporting 5V input, 200mA–1A programmable charge current, 4.2V CV output, and integrated trickle charge, timer-based termination, and NTC-based temperature monitoring. It implements dual LED status indication (red/green) and reverse-polarity protection down to –16V, targeting portable USB/adapter-powered devices.

For engineers reviewing the EV26057DQ-00A datasheet, EV26057DQ-00A pinout, EV26057DQ-00A application, or EV26057DQ-00A equivalent, this board enables rapid validation of MP26057DQ's CC/CV charging behavior, thermal safety response, battery full detection accuracy (±0.75%), and input surge tolerance up to 28V in real PCB layouts.

Technical Context

The EV26057DQ-00A board hosts the MP26057DQ QFN-10 IC with integrated high-voltage input protection, enabling operation from 3.5V–6.5V input while surviving transient surges to 28V. It implements analog current-setting via ISET resistor network and digital status feedback through two discrete LEDs driven by dedicated CHG and BAT pins.

Board-level features include jumper-selectable charge current (200/500/700/800/1000 mA), on-board NTC interface for battery temperature sensing, and a programmable timer that forces charge termination after timeout - all configured using discrete resistors (R1–R8) and 3×2-pin headers (JP1–JP3).

Key Specifications

Availability

EV26057DQ-00A is available at Aetrix Electronics and suitable for battery management validation, portable device power subsystem prototyping, and Li-ion charger IC qualification requiring stable component supply and pre-tested reference hardware.

Supply support for EV26057DQ-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 design centers across Asia and North America and global distribution.

The MP26057 product line delivers highly integrated linear Li-ion chargers optimized for space-constrained, cost-sensitive portable electronics - emphasizing robustness against input transients, precision voltage regulation, and safe thermal management without external controllers.

FAQ

What input voltage range does the EV26057DQ-00A support?

The board accepts 3.5 V to 6.5 V DC input, aligned with the MP26057DQ IC's operational range. It tolerates transient surges up to 28 V due to integrated overvoltage protection, but sustained input must remain within the 3.5–6.5 V window for proper CC/CV charging control and thermal safety.

How is charge current selected on this evaluation board?

Charge current is set using three 2-pin jumpers (JP1, JP2, JP3) in combinations specified in the Quick Start Guide: e.g., JP1+JP2 closed = 800 mA; JP1+JP2+JP3 closed = 1000 mA. Each setting configures the ISET resistor network to deliver the corresponding current into a 4.2 V battery.

Does the board provide battery temperature monitoring?

Yes - the board includes an NTC thermistor interface (labeled "NTC" on schematic and silkscreen) connected to the MP26057DQ's dedicated NTC pin. When populated with a compatible NTC, the IC disables charging if battery temperature falls outside the programmed safe range (e.g., <0°C or >45°C).

What does the red/green LED behavior indicate during charging?

Red ON = charging active; Green ON = battery full and no fault; Red flashing = timer timeout; Green flashing = battery too cold. Both OFF indicates no VIN or invalid battery connection. Behavior matches MP26057DQ's native status logic and requires correct jumper/resistor configuration.

Can the output voltage be adjusted above 4.2 V?

No - the output is factory-preset to 4.2 V via internal resistor divider and is not user-adjustable. The MP26057DQ does not support external voltage programming; it is designed exclusively for single-cell Li-ion/Li-Polymer with fixed 4.2 V CV regulation and ±0.75% accuracy.

Is reverse polarity protection implemented on this board?

Yes - the MP26057DQ IC integrates input polarity reverse protection down to –16 V. The EV26057DQ-00A board routes VIN directly to the IC's input pin without external diodes, relying entirely on the IC's internal protection circuitry to block reverse current and prevent damage.