Monolithic Power Systems Inc. MP2670DQ-LF-P

Overview

MP2670DQ-LF-P from Monolithic Power Systems is a single-cell Li-ion/Li-polymer battery charger protection IC with integrated high-voltage input surge tolerance (up to +30V), input overvoltage protection (5.8V threshold, 1µs response), battery overvoltage protection (4.475V trip), programmable overcurrent limit (0.9–1.1A via ILIM resistor), and thermal shutdown at 150°C. It serves as redundant safety layer in portable charging systems such as smartphones and digital cameras.

For engineers reviewing the MP2670DQ-LF-P datasheet, MP2670DQ-LF-P pinout, MP2670DQ-LF-P application, or MP2670DQ-LF-P equivalent, key selection considerations include its 10-pin QFN package, open-drain FLT fault indicator, EN enable control with internal 200kΩ pull-down, VB pin for isolated battery voltage monitoring, and RDS(ON) of 450mΩ typical - all critical for fail-safe linear charger integration.

Technical Context

The MP2670 operates as a series protection switch between input (VIN) and output (OUT), using an internal N-channel MOSFET controlled by analog comparators monitoring VIN, VB, and current sense via ILIM. Its protection logic includes 170µs OCP blanking and 180µs BOVP blanking to suppress transients, plus dual 4-bit counters that permanently disable the FET after 16 cumulative OCP or BOVP events unless reset by power cycle or EN toggle.

It features a 2.6V POR with 110mV hysteresis, soft-start sequencing with ~10ms delay to mitigate hot-insertion surges, and temperature-dependent hysteresis (150°C trip, 110°C recovery). The FLT pin provides open-drain fault signaling across all four protection domains: input OVP, battery BOVP, charge OCP, and die OTP.

Key Specifications

Pinout & Package

MP2670DQ-LF-P is housed in a thermally enhanced 10-pin 3mm × 3mm QFN package with exposed thermal pad (must be connected to GND plane). The package supports high-power dissipation (θJA = 50°C/W on 4-layer PCB) and enables compact layout in space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ29700DRVR and TP4056+DW01A, MP2670DQ-LF-P uniquely delivers 30V input surge tolerance, unified FLT signaling, and permanent fault latching - making it the only option for unregulated adapter environments requiring IEC-compliant safety without external components.

Availability

MP2670DQ-LF-P is available at Aetrix Electronics and suitable for smartphone charging systems, digital camera power management, and desktop Li-ion battery chargers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2670DQ-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 MP2670 belongs to MPS's battery protection product line, engineered specifically to provide redundant, fault-tolerant safety layers for Li-ion charging systems where reliability and compliance with IEC 62368-1 are mandatory.

FAQ

What is the purpose of the ILIM pin, and how is the overcurrent threshold calculated?

The ILIM pin sets the overcurrent protection threshold by connecting an external resistor to GND. The threshold current is calculated as I_OCP = 0.8V / R_ILIM, where R_ILIM is the resistor value in ohms. For example, a 25kΩ resistor yields 32mA × 25 = 0.8V → 1.0A OCP. This uses an internal 0.8V reference and matched FET current mirroring for ±10% accuracy.

Can the MP2670DQ-LF-P be used without the VB pin connection?

No. The VB pin is mandatory for battery overvoltage protection functionality. It connects via RVB resistor to the battery pack's positive terminal and provides the voltage reference for the BOVP comparator (CP3). Omitting this connection disables BOVP, leaving the system vulnerable to overcharging - violating core safety intent of the device.

How does the FLT pin behave during simultaneous protection events?

The FLT pin is a wired-OR open-drain output that pulls low whenever any of the four protection conditions occurs - input OVP, battery BOVP, overcurrent, or overtemperature. It remains low for the duration of the active fault and resets only after the fault clears *and* the internal recovery sequence completes (e.g., 40ms OCP hold-off + 10ms soft-start).

What is the role of the exposed thermal pad, and how should it be connected?

The exposed pad is electrically and thermally connected to GND internally. It must be soldered to a dedicated GND copper pour on the PCB to achieve specified θJA = 50°C/W and ensure reliable thermal shutdown operation. Leaving it unconnected degrades thermal performance by >30% and risks premature OTP activation under load.

Does the MP2670DQ-LF-P support automatic reset after fault clearance?

It supports automatic reset for single-event faults (e.g., transient OVP), but implements permanent latch-off after 16 cumulative OCP or BOVP events. Recovery requires either cycling VIN power or toggling the EN pin - a deliberate design choice to force system-level fault investigation before resuming operation.

Is the EN pin compatible with standard GPIO voltage levels from microcontrollers?

Yes. With logic HIGH threshold of 1.5V and LOW threshold of 0.4V, the EN pin is compatible with 1.8V, 3.3V, and 5V GPIO outputs. Its internal 200kΩ pull-down ensures default-enable behavior when left unconnected, simplifying interface design in battery-powered systems.