Monolithic Power Systems Inc. EV2635-R-01A

Overview

EV2635-R-01A from Monolithic Power Systems is an evaluation board for the MP2635 switch-mode battery charge and system power path management IC, designed for single-cell Li-ion/Li-Polymer systems. It supports dual-mode operation-charge mode (up to 2A input current limit, 4.2V/3.6V selectable full-charge voltage) and boost mode (5V regulated SYS output, 1.5A current limit)-with integrated thermal shutdown, input over-voltage protection, battery temperature monitoring, and programmable charge timer.

For engineers reviewing the EV2635-R-01A datasheet, EV2635-R-01A pinout, EV2635-R-01A application, or EV2635-R-01A equivalent, this board enables rapid validation of MP2635-based portable power architectures including power banks, USB-C PD accessories, and sub-battery backup systems requiring seamless input-to-battery and battery-to-system power routing.

Technical Context

The EV2635-R-01A implements a fully configured reference design for the MP2635 QFN24 IC, with preset resistor networks setting key parameters: 5V SYS regulation (R1=31.6kΩ, R2=10kΩ), 2.7A input current limit (RILIM=15kΩ), 2A charge current (RS1=50mΩ, RISET=28kΩ), and 3-hour charge timer (CTMR=100nF). Operating frequency is fixed at 1.2MHz via floating FREQ pin.

Board-level protections include PWIN-based input over-voltage cutoff (trip at VIN >6V), REG-pin input voltage regulation (4.75V setpoint), battery reverse-leakage blocking, and thermal shutdown. Mode selection is hardware-controlled via MODE and EN jumpers, with LED indicators (LED1–LED3) distinguishing charge vs. boost states.

Key Specifications

Availability

EV2635-R-01A is available at Aetrix Electronics and suitable for power bank development, USB-C accessory prototyping, and portable medical device battery subsystem validation requiring stable component supply, traceable sourcing, and long-term evaluation board availability.

Supply support for EV2635-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 mixed-signal ICs for power management, motor drive, and automotive applications.

The EV2635-R-01A belongs to MPS's evaluation board product line, developed specifically to accelerate adoption of the MP2635 family for single-cell battery systems requiring bidirectional power path control and robust safety features.

FAQ

What is the primary function of the EV2635-R-01A?

The EV2635-R-01A is an evaluation board-not a standalone IC-that demonstrates the MP2635's dual-mode operation: charging a single-cell Li-ion battery from an external source (charge mode) and boosting battery voltage to power a 5V system rail (boost mode). It includes all necessary passives, jumpers, and LEDs for immediate functional validation without custom PCB design.

How do I configure the board for charge mode versus boost mode?

Charge mode is enabled by shorting the EN jumper to "H" and MODE to "L"; boost mode requires shorting MODE to "H" and EN to "L". These hardware-selectable modes are independent of firmware and reflect the MP2635's native pin-strapped control architecture, ensuring deterministic behavior during lab testing and system integration.

Can the 5V SYS output be adjusted to a different voltage?

Yes-the 5V SYS output is set by the R1/R2 resistor divider on the REG pin (31.6kΩ/10kΩ). To change the output, replace R1 and/or R2 using Equation VSYS = 1.2V × (R1 + R2)/R2. The board layout supports 0603 resistors, enabling quick reconfiguration for 4.5V, 5.5V, or other values within the MP2635's 4.2–5.5V boost range.

What battery voltage range does the board support in boost mode?

In boost mode, the EV2635-R-01A supports battery input voltages from 2.5 V to 4.35 V, covering full discharge to overcharge conditions of standard 1S Li-ion and Li-Polymer cells. The MP2635 automatically disables boost if VBATT falls below 2.5V to prevent deep discharge damage.

Does the board include battery temperature monitoring circuitry?

Yes-the board includes RT1 and RT2 (10kΩ NTC thermistor interface resistors) and associated traces for connecting a standard 10kΩ NTC thermistor to the MP2635's TS pin. This enables real-time battery temperature monitoring and automatic charge suspension outside user-defined thermal limits, as implemented in the MP2635's safety engine.

Is the EV2635-R-01A RoHS-compliant and lead-free?

Yes-all components on the EV2635-R-01A-including the MP2635GR IC, capacitors, resistors, inductor, and LEDs-are lead-free and compliant with the EU RoHS directive. MPS confirms green status for this board on its official Quality Assurance page, with full material declarations available upon request.