Monolithic Power Systems Inc. MP2678EG-104-LF-P

Overview

MP2678EG-104-LF-P from Monolithic Power Systems is a single-cell Li-ion/Li-polymer battery charger protection IC with integrated 5V low-dropout regulation, 10.4V input over-voltage protection (OVP), proprietary battery OVP at 4.35V, 1.5A over-current protection, and thermal shutdown at 140°C. It functions as a redundant safety layer between the AC adapter and linear charger in portable electronics, using an internal N-channel MOSFET to disconnect VIN from OUT during fault events.

For engineers reviewing the MP2678EG-104-LF-P datasheet, MP2678EG-104-LF-P pinout, MP2678EG-104-LF-P application, or MP2678EG-104-LF-P equivalent, this device delivers precise 5V output regulation with sub-1µs OVP response, open-drain FLT fault signaling, active-low CE enable control, and QFN-8 (2mm×2mm) package compatibility for space-constrained battery management systems.

Technical Context

The MP2678EG-104-LF-P implements a linear regulator architecture with integrated protection logic: its internal N-channel MOSFET regulates VOUT to 5V across VIN = 3.3V to 10.4V, while independent comparators monitor VIN (OVP threshold 10.4V ±0.5V), VBATT (battery OVP 4.35V ±0.12V), and current sense (OCP 1.5A ±0.3A). All fault responses-input OVP, battery OVP, OCP, and thermal shutdown-force the MOSFET into high-impedance off-state within ≤1µs to 50ms depending on fault type.

It features a dedicated VB pin with 100nA leakage for accurate battery voltage monitoring via external resistor divider, a CE pin with 0.4V logic-low enable threshold and internal pull-down, and an open-drain FLT pin that sinks ≥5mA when any fault occurs. Thermal shutdown activates at 140°C (rising) and recovers at 120°C (falling), with die temperature continuously monitored via on-die sensor.

Key Specifications

Pinout & Package

MP2678EG-104-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 to achieve θJA = 80°C/W and sustain 1.25W power dissipation at TA = 25°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2672GQ-Z and BQ296xxx, MP2678EG-104-LF-P uniquely combines 10.4V input OVP, 4.35V battery OVP, and 5V LDO regulation in one QFN-8 device-enabling compact, self-contained protection for single-cell portable devices without external regulators or secondary supervisors.

Availability

MP2678EG-104-LF-P is available at Aetrix Electronics and suitable for smartphone charging circuits, portable medical monitors, digital cameras, and Bluetooth headsets requiring stable component supply with guaranteed long-term lifecycle support.

Supply support for MP2678EG-104-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 mixed-signal ICs for power management, motion control, and interface applications, with global design and support centers.

The MP2678 belongs to MPS's battery protection IC product line, engineered specifically to provide integrated, high-speed fault protection for single-cell Li-ion charging architectures in consumer and portable medical electronics.

FAQ

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

The VB pin is a high-impedance input for monitoring battery voltage (VBATT) to enable MPS's proprietary battery OVP function. It must be connected to the battery's positive terminal through an external resistor (RVB = 200kΩ to 1MΩ) to limit fault current and minimize OVP threshold error. Typical VB leakage is 100nA, so RVB selection balances fault safety against voltage sensing accuracy.

Does MP2678EG-104-LF-P require external components to operate?

Yes-minimum required external components are input capacitor (CIN = 1μF ceramic), output capacitor (COUT = 1μF ceramic), VB resistor (RVB), and FLT pull-up resistor (RFLT = 6.04kΩ typical). No external MOSFETs, op-amps, or voltage references are needed, as all regulation and protection functions are fully integrated.

How does the CE pin behave when left unconnected?

When CE is left unconnected, its internal pull-down resistor (value not specified but sufficient per datasheet) holds the pin below 0.4V, enabling the IC by default. This allows "plug-and-play" operation without requiring active GPIO control, though tying CE to a microcontroller enables software-controlled charge enable/disable.

Can MP2678EG-104-LF-P be used with lithium iron phosphate (LiFePO₄) batteries?

No-it is designed exclusively for single-cell Li-ion and Li-polymer batteries with 4.2V nominal charge voltage. Its battery OVP threshold is fixed at 4.35V, which is incompatible with LiFePO₄'s 3.6V nominal and ~3.7V max charge voltage; using it would cause premature charge cutoff and reduced capacity utilization.

What happens during thermal shutdown, and how does recovery work?

When die temperature reaches 140°C, the internal N-MOSFET turns off and FLT goes low. Operation remains suspended until the die cools to ≤120°C (20°C hysteresis), at which point the IC automatically resumes normal regulation after an 8ms power-on reset delay-no external reset signal is required.

Is the 30V input surge rating applicable for continuous operation?

No-the 30V rating is absolute maximum stress limit for short-duration transients only (e.g., ESD or hot-plug spikes). Continuous operation is limited to VIN ≤ VOVP = 10.4V; sustained input above this level triggers immediate OVP shutdown and may cause permanent damage if repeatedly stressed.