Monolithic Power Systems Inc. EV26075EQ-00A

Overview

EV26075EQ-00A from Monolithic Power Systems is an evaluation board for the MP26075 cradle charger IC, implementing a flyback AC-DC topology with HF0100HS primary-side controller and PC817C optocoupler feedback. It delivers 1 A constant-current charging for single-cell Li-ion/Li-polymer batteries at 4.2 V, supports 85–265 VAC input, and integrates power-up sequencing, battery temperature monitoring, and fault indication via dual-color LEDs.

For engineers reviewing the EV26075EQ-00A datasheet, EV26075EQ-00A pinout, EV26075EQ-00A application, or EV26075EQ-00A equivalent, this board enables rapid validation of cradle charger designs requiring regulated 4.2 V output, programmable 1 A charge current (via RSET = 1.69 kΩ), OVP/OCP/OTP protection, and pre-charge mode - all in a 5.66 cm × 3.91 cm PCB form factor.

Technical Context

The board implements a quasi-resonant flyback converter where HF0100HS controls primary-side switching, while MP26075 monitors battery voltage and current, feeding back to the flyback controller via PC817C optocoupler to regulate output voltage precisely against battery terminal voltage. This closed-loop opto-coupled control ensures high efficiency across line and load variations.

MP26075 governs system-level safety: it enforces controlled power-up sequencing (ramping AC adapter first to limit inrush), executes low-current pre-charge for deeply discharged cells, activates auto-recharge upon voltage drop below threshold, and triggers LED-based status/fault signaling (red/green combinations) per defined states including normal charge, end-of-charge, and fault conditions.

Key Specifications

Availability

EV26075EQ-00A is available at Aetrix Electronics and suitable for cradle charger development, portable medical device battery management, and consumer electronics reference design validation requiring stable component supply and fast-turn evaluation capability.

Supply support for EV26075EQ-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 MP26075 product line targets plug-in cradle chargers for portable electronics, delivering integrated safety, efficiency, and compact AC-DC + battery charge control in a single-chip solution.

FAQ

What input voltage range does the EV26075EQ-00A support?

The board accepts 85–265 VAC input, enabling global mains compatibility without external voltage selection. Its flyback topology with HF0100HS QR controller maintains regulation and efficiency across this full range, verified per Rev. 1.0 schematic and test data.

How is charge current set on this evaluation board?

Charge current is fixed at 1 A by RSET = 1.69 kΩ (Yageo RC0603FR-071K69L), per the formula CHG = 1.23 × 1400 / RSET(kΩ). The resistor location and value are documented in the BOM on page 4 of the reference design guide.

Does the board provide battery temperature monitoring?

Yes - the MP26075 IC supports battery temperature monitoring via an external NTC thermistor (RT1, Murata NTPAA100LDNBO, 10 Ω nominal at 25°C), connected to the TEMP pin. The IC uses this signal to suspend charging outside safe thermal limits.

What do the red and green LEDs indicate during operation?

LED status follows defined states: Red ON/Green OFF = normal charging; Red OFF/Green ON = end-of-charge; both OFF = fault or toggle condition (e.g., overvoltage, overtemperature); both ON = not defined in spec. These mappings are confirmed in the Quick Start Guide section 5.

Can the output voltage be adjusted for different battery chemistries?

No - the board is factory-configured for 4.2 V, matching standard single-cell Li-ion/Li-polymer termination. Output voltage is set by internal MP26075 reference and external feedback resistors (R10, R11, R13) as shown in the schematic; modification requires redesigning the feedback network and revalidating safety compliance.

Is the EV26075EQ-00A RoHS-compliant and lead-free?

Yes - all components listed in the BOM (pages 3–4) carry RoHS-compliant part numbers (e.g., Yageo RC0603FR-071K69L, Murata GRM188R71A225KE1), and MPS confirms RoHS/lead-free compliance for MP26075EQ and HF0100HS per their official product change notices.