Monolithic Power Systems Inc. EV2681B-S-00A

Overview

EV2681B-S-00A from Monolithic Power Systems is an evaluation board for the MP2681B CC/CV lithium-ion/polymer battery charge controller IC, supporting 3S–5S configurations, 0–4 A programmable charge current, and full protection including NTC monitoring, overtemperature, charge timeout, and power line fault detection. It implements AC adapter input (85–220 V_AC) with integrated offline regulation and status LED indication for cradle and standalone fast-charger applications.

For engineers reviewing the EV2681B-S-00A datasheet, EV2681B-S-00A pinout, EV2681B-S-00A application, or EV2681B-S-00A equivalent, this board enables rapid validation of MP2681B-based charger designs with pre-verified layout, BOM, thermal management, and protection sequencing - critical for portable tools and industrial battery systems requiring safe, adaptive multi-cell charging.

Technical Context

The EV2681B-S-00A is a functional hardware platform-not an IC-built around the MP2681B SOIC-16 controller and HFC0400 SOIC-8 offline regulator. It implements full AC-DC conversion (via GBU406 bridge, 33 mH/LX2 + 3.3 μH/L1 filter, and 700 V Q1 MOSFET), precision current sensing (R19 = 50 mΩ), and dual LED status signaling (LEDG/LEDR) driven directly by MP2681B's CHG_OK and FAULT pins.

Board-level functionality includes automatic battery cell detection via ID resistor voltage mapping (0.3–2.65 V thresholds for 3S/4S/5S), fixed 16.59 V output for 4S mode, and safety-critical isolation between primary-side AC input and secondary-side battery interface using PC817A optocoupler feedback and reinforced creepage/clearance per IEC 62368-1.

Key Specifications

Availability

EV2681B-S-00A is available at Aetrix Electronics and suitable for portable power tools, industrial handheld equipment, medical battery packs, and consumer fast-charging systems requiring stable component supply and validated reference design implementation.

Supply support for EV2681B-S-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 management, motor drivers, and AC-DC solutions.

The EV2681B-S-00A belongs to MPS's battery charger evaluation platform family, designed specifically to accelerate development of safe, efficient, multi-cell Li-ion charging systems for industrial and professional-grade portable equipment.

FAQ

What is the function of the EV2681B-S-00A?

The EV2681B-S-00A is a fully assembled evaluation board for the MP2681B battery charge controller IC. It provides a working AC-input (85–220 V_AC) to multi-cell Li-ion battery charging solution with verified layout, protection circuitry, and status LEDs - enabling immediate functional testing and design validation without custom PCB development.

Does the board support 3S, 4S, and 5S battery configurations?

Yes. The board automatically detects battery configuration via the ID pin voltage: 0.3–0.7 V selects 3S (12.44 V), 0.95–1.6 V selects 4S (16.59 V), and 1.75–2.65 V selects 5S (20.74 V). An external resistor network or direct voltage source can configure the ID pin per the MP2681B VID lookup table.

How is charge current programmed on this board?

Charge current is set to 3 A by default using R19 = 50 mΩ, based on the MP2681B's internal 0.16 V current-sense reference (ICHG = 0.16 V / R_SENSE). The ±15% tolerance of the reference means actual current may range from ~2.55 A to ~3.45 A unless trimmed via R19 value adjustment.

What safety protections are implemented on the EV2681B-S-00A?

The board implements all MP2681B-native protections: NTC-based battery temperature monitoring, overtemperature shutdown, programmable charge timeout, and power line fault detection. Fault conditions trigger LEDR flashing and disable charging, while thermal derating and automatic restart behavior follow MP2681B's internal logic.

Can the EV2681B-S-00A be used with non-MPS AC-DC controllers?

No - the board is purpose-built for the MP2681B and integrates the HFC0400 offline regulator as its primary AC-DC stage. Replacing either IC would require redesigning gate drive, feedback, transformer bias, and protection interlocks; it is not a generic platform for other controllers.

Is the board RoHS-compliant and lead-free?

Yes. All components listed in the BOM - including the MP2681BGS IC, HFC0400HS regulator, and passive parts - are lead-free, halogen-free, and compliant with the EU RoHS Directive. MPS confirms green status for these parts on its official Quality Assurance webpage.