Monolithic Power Systems Inc. MP2678EG-LF-P

Overview

MP2678EG-LF-P from Monolithic Power Systems is a single-cell Li-ion/Li-polymer battery charger protection IC with integrated 5V low-dropout regulation, input surge tolerance up to 30V, 10.4V input OVP threshold, and proprietary battery OVP at 4.35V. It functions as a redundant safety layer upstream of linear chargers in portable electronics, delivering regulated output while enforcing over-voltage, over-current (1.5A), and thermal shutdown (140°C) protection.

For engineers reviewing the MP2678EG-LF-P datasheet, MP2678EG-LF-P pinout, MP2678EG-LF-P application, or MP2678EG-LF-P equivalent, this device is selected for high-reliability battery charging paths requiring precise 5V regulation, fast fault response (<1µs OVP propagation), and minimal external component count in space-constrained QFN-8 (2mm×2mm) layouts.

Technical Context

The MP2678EG-LF-P operates as a linear regulator with internal N-channel MOSFET pass element, maintaining 5V output across 3.3V–10.4V input range while monitoring VIN, VBATT, temperature, and load current. Its functional block includes independent comparators for input OVP (10.4V), battery OVP (4.35V), and OCP (1.5A), each with dedicated blanking times (170–176µs) to reject transients.

Fault handling is hardware-automated: FLT pin asserts open-drain low on any fault (input OVP, battery OVP, SCP, OTP), and recovery requires both fault clearance and 8ms reset delay. Thermal shutdown triggers at 140°C with 20°C hysteresis, and CE enables/disables operation via active-low logic with built-in pull-down.

Key Specifications

Pinout & Package

MP2678EG-LF-P is housed in a thermally enhanced QFN-8 package (2mm × 2mm, 0.5mm pitch) with exposed thermal pad. The pad must be soldered to PCB ground plane for optimal thermal performance (θJA = 80°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Li-ion battery charger protection applications.

Compared with MP2678EG-LF-P, MP2672EG-LF-Z sacrifices battery OVP and surge resilience for lower cost, while BQ24075RGTR merges functions but lacks high-voltage input robustness-making MP2678EG-LF-P uniquely suited for unregulated adapter inputs in compact consumer devices.

Availability

MP2678EG-LF-P is available at Aetrix Electronics and suitable for smartphone charging protection, digital camera power management, portable medical monitors, and Bluetooth headset battery safety requiring stable component supply and RoHS-compliant packaging.

Supply support for MP2678EG-LF-P 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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP2678 belongs to MPS's battery protection IC product line, engineered specifically for space-constrained portable electronics needing robust, integrated safety against input surges, overvoltage, overcurrent, and thermal faults in Li-ion charging paths.

FAQ

What is the purpose of the VB pin, and how is it connected?

The VB pin monitors battery voltage for proprietary battery OVP at 4.35V. It connects to the battery pack's positive terminal through an external resistor (RVB = 200kΩ–1MΩ) to limit fault current and minimize sensing error. Typical VB leakage is 20nA, contributing ≤20mV error at 1MΩ.

Does MP2678EG-LF-P require external capacitors, and what values are recommended?

Yes: CIN (1–4.7µF ceramic) decouples input transients; COUT (1–4.7µF ceramic) stabilizes regulated 5V output and shares node with downstream charger. Both are mandatory for stable operation and OVP response integrity per datasheet Figure 1.

How does the FLT pin behave during different fault conditions?

FLT is open-drain and pulls low identically for all four fault types: input OVP, battery OVP, output short-circuit, and thermal shutdown. It remains low until fault clears and 8ms reset timer expires; CE high forces FLT high regardless of fault state.

Can MP2678EG-LF-P operate without the CE pin connected?

Yes. CE has an internal pull-down resistor, so leaving it unconnected defaults the device to disabled state. To enable operation, CE must be actively pulled below 0.4V; no external pull-down is required.

What is the significance of the 330mV dropout voltage specification?

The 330mV dropout at 1A defines the minimum VIN–VOUT differential needed to sustain regulation. At VIN = 5.33V, MP2678EG-LF-P still delivers stable 5V output-extending usable input range below standard 5.5V USB limits and improving adapter compatibility.

Is thermal shutdown reversible, and what is the recovery behavior?

Yes. Thermal shutdown is fully reversible: when junction temperature falls below 120°C (20°C hysteresis), the internal MOSFET re-enables automatically after the 8ms reset delay-no external reset signal is needed.

How does the MP2678EG-LF-P differ from a standard linear regulator?

Unlike generic LDOs, MP2678EG-LF-P integrates four independent protection functions (input OVP, battery OVP, OCP, OTP), fault signaling (FLT), and enable control (CE) in one QFN-8 package-specifically architected for Li-ion charger safety, not general-purpose regulation.