Monolithic Power Systems Inc. EV2635A-R-00A

Overview

EV2635A-R-00A from Monolithic Power Systems is an evaluation board for the MP2635A high-integration switching battery charger IC, designed to demonstrate dual-mode power management (charge and reverse boost) for single-cell Li-ion systems. It supports 4.24–6 V input, delivers up to 2 A programmable charge current and 1 A regulated 5 V SYS output in boost mode, with full protection including thermal shutdown, battery overvoltage, and NTC-based temperature monitoring - validated in portable media player and power-bank reference designs.

For engineers reviewing the EV2635A-R-00A datasheet, EV2635A-R-00A pinout, EV2635A-R-00A application setup, or EV2635A-R-00A equivalent evaluation platforms, this board provides verified hardware implementation of MP2635A's input-current-based power path management, selectable 3.6 V / 4.2 V charge voltage, and programmable charge timer - enabling rapid validation of battery charging and system backup power sequencing.

Technical Context

The EV2635A-R-00A implements the MP2635A's dual-path architecture: in charge mode, it regulates battery voltage to 4.2 V (±0.5%) while limiting input current to 2.7 A via ILIM pin resistor; in boost mode, it converts battery energy to a regulated 5 V SYS output with 1 A current limit set by OLIM and RS1. Operation mode is selected via MODE pin logic level, and switching frequency is configurable at 600 kHz or 1.2 MHz using the FREQ pin.

Power path control is fully autonomous: when VIN is present, the board prioritizes system load (SYS) before charging; when VIN is absent, it enables reverse boost from BATT to SYS. Protection features include PWIN-based input overvoltage cutoff at 6 V, REG-based input undervoltage lockout below 4.24 V, and battery reverse leakage blocking via internal MOSFET control.

Key Specifications

Availability

EV2635A-R-00A is available at Aetrix Electronics and suitable for power-bank development, portable media player reference design validation, and sub-battery system prototyping requiring stable component supply, traceable sourcing, and documented evaluation platform support.

Supply support for EV2635A-R-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 mixed-signal ICs for power management, motion control, and automotive applications - headquartered in Kirkland, WA, with global design and support centers.

The EV2635A-R-00A belongs to MPS's evaluation board product line targeting portable battery-powered systems, specifically engineered to accelerate adoption of the MP2635A's integrated charge/boost architecture in consumer and IoT edge devices.

FAQ

What is the primary function of the EV2635A-R-00A evaluation board?

The EV2635A-R-00A is a hardware platform designed exclusively to demonstrate and validate the MP2635A IC's dual-mode operation: charging a single-cell Li-ion battery from a 4.24–6 V input source, and delivering regulated 5 V/1 A system power from the battery via reverse boost when input is absent. It includes all necessary passive components, jumpers, and status LEDs for immediate functional testing without additional circuitry.

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

Charge mode is enabled by setting the EN jumper to "H" and MODE jumper to "L"; boost mode requires MODE jumper set to "H" and EN jumper to "L". These jumpers directly drive the MP2635A's EN and MODE pins. The board's LED indicators (LED1–LED3) provide real-time visual confirmation of active mode and fault conditions such as thermal shutdown or input OVP.

Can the charge full voltage be changed from 4.2 V to 3.6 V on this board?

Yes. The default charge voltage is 4.2 V, achieved by leaving the VB pin floating. To select 3.6 V, connect the VB pin to GND using a wire or zero-ohm jumper - this configures the MP2635A's internal reference to the lower threshold. No resistor changes or firmware updates are required; the switch is purely hardware-based and confirmed in the Quick Start Guide (Section 4).

What is the role of the PWIN and REG pins on the EV2635A-R-00A?

PWIN monitors input voltage and triggers automatic disconnect at 6 V using RH/RL resistor divider (215 Ω / 51 Ω); REG senses input voltage via R3/R4 (110 Ω / 51 Ω) to ensure minimum 4.24 V operation and prevent startup under weak input conditions. Both pins implement hardware-level protection independent of MCU control, ensuring fail-safe behavior during adapter transients or brownouts.

Does the board support programmable charge current and boost current limits?

Yes. Charge current is set to 2 A by default using RISET = 28 kΩ and RS1 = 50 mΩ, per the formula I_CHG = 70 × 0.04 / (RISET × RS1). Boost current limit is set to 1 A using ROLM = 56 kΩ and same RS1, per I_OLIM = 70 × 0.04 / (ROLM × RS1). All current-setting resistors are 0603 footprints and user-replaceable for custom tuning.

Is thermal management implemented on the EV2635A-R-00A board?

Yes. The board incorporates thermal shutdown via the MP2635A's internal junction sensor, with activation at ~150 °C. It also includes NTC thermistor interface (R_T1/R_T2 = 10 kΩ) connected to the NTC pin for real-time battery temperature monitoring and charge suspension if thresholds are exceeded - critical for safe operation with high-capacity Li-ion cells.