Monolithic Power Systems Inc. EV2637A-R-00A

Overview

EV2637A-R-00A from Monolithic Power Systems is an evaluation board for the MP2637A switch-mode battery charger IC, enabling power path management (PPM) and bidirectional energy flow between input, battery, and system rails. It supports 2.5A charging of single-cell Li-ion/Li-Polymer batteries and 2.2A boost-mode SYS output at 5V, with integrated thermal shutdown, input/battery overvoltage protection, and battery temperature monitoring via NTC interface.

For engineers reviewing the EV2637A-R-00A datasheet, EV2637A-R-00A pinout, EV2637A-R-00A application, or EV2637A-R-00A equivalent, this board provides validated reference design implementation, quick-start configuration guidance for charge/boost mode selection, programmable current/voltage settings, and real-world validation of PPM behavior under input source presence or absence.

Technical Context

The EV2637A-R-00A implements dual-mode operation: charge mode (VIN → BATT + SYS) with up to 2.5A ICHG and input-current limiting via ILIM pin; and boost mode (BATT → SYS) with up to 2.2A ISYS and adjustable VSYS regulation via resistor divider on REG pin. Mode selection is controlled by the MODE pin logic level.

It integrates full status indication (LED1–LED3), programmable charge timer (CTMR-based), battery reverse-leakage blocking, and input voltage regulation feedback via REG pin. The board uses the MP2637AGR QFN-24 (4mm × 4mm) as its core IC, with all critical passive components pre-populated per MPS reference layout.

Key Specifications

Availability

EV2637A-R-00A is available at Aetrix Electronics and suitable for power-bank development, portable medical device prototyping, and sub-battery system validation requiring stable component supply, repeatable test conditions, and reference-grade implementation fidelity.

Supply support for EV2637A-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, motor drive, and automotive applications.

The MP2637A product line targets portable electronics requiring integrated battery charging and dynamic power path control - designed specifically for space-constrained, single-cell Li-ion systems needing simultaneous charge and system power delivery.

FAQ

What is the primary purpose of the EV2637A-R-00A evaluation board?

The EV2637A-R-00A is a fully assembled reference design board for evaluating the MP2637A battery management IC. It demonstrates charge mode (up to 2.5A), boost mode (up to 2.2A at 5V), power path management, and protection features including thermal shutdown, input/battery overvoltage, and NTC-based temperature monitoring.

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

Set EN jumper to H and MODE jumper to L for charge mode; set MODE jumper to H and EN jumper to L for boost mode. These hardware jumpers directly control the MODE and EN pins of the MP2637AGR IC, selecting operational state without firmware or external controller.

Can the charge voltage be adjusted, and how is it set?

Yes - the full-charge voltage is selectable between 4.055V and 4.2V with 0.5% accuracy. Connect the VB pin to GND for 4.2V or leave it floating (or tie to logic high) for 4.055V. No resistor programming is required; configuration is digital-level pin strapping.

What is the role of the CTMR capacitor on this board?

The CTMR capacitor (C4, 100nF) sets the total charge timer duration. With RS1 = 20mΩ and ICHG = 2.5A, it yields ~2.4 hours of maximum charge time - a safety mechanism preventing indefinite charging of deeply discharged or faulty batteries.

Does the board support battery temperature monitoring, and how is it implemented?

Yes - the board includes an NTC thermistor interface (NTC header) connected to the MP2637A's TS pin. This enables real-time battery temperature sensing for charge rate derating or thermal cutoff, using standard 10kΩ NTC thermistors with B-value matching the IC's internal reference.

Is the 5V SYS output regulated, and what determines its accuracy?

Yes - the SYS output is actively regulated to 5V ±1% via the MP2637A's internal feedback loop. Accuracy depends on the resistor divider (R1/R2 = 31.6kΩ/10kΩ) on the REG pin and the IC's internal 1.5V reference; layout and component tolerance contribute to final system-level precision.