Monolithic Power Systems Inc. MP2671DL-LF-P

Overview

MP2671DL-LF-P from Monolithic Power Systems is a single-cell Li-ion/Li-polymer battery charger protection IC integrating input overvoltage (5.85 V typ), battery overvoltage (4.34 V typ), overcurrent (1.0 A typ with 25 kΩ ILIM resistor), and overtemperature (140 °C rising threshold) protection functions. It features a 3 mm × 4 mm QFN-12 package, 1 µs OVP response, and open-drain WRN fault indicator - deployed in portable electronics requiring redundant safety layer between AC adapter and linear charger.

For engineers reviewing the MP2671DL-LF-P datasheet, MP2671DL-LF-P pinout, MP2671DL-LF-P application, or MP2671DL-LF-P equivalent, key selection criteria include programmable OCP via ILIM resistor, integrated 30 V surge-tolerant input stage, thermal latch-off behavior, and compatibility with MP2602-family chargers in dual-protection architectures.

Technical Context

The MP2671 operates as a series protection switch placed between the input power source and the downstream battery charger IC. Its internal N-channel MOSFET (R_DS(ON) = 280 mΩ max) is controlled by analog comparators monitoring VIN, VB, and current-sense voltage derived from a 31,250× mirrored sensing FET.

Protection logic includes 4-bit counters for BOVP and OCP events - latching off permanently after 16 occurrences unless reset by cycling EN or VIN. The WRN output asserts low on any active fault, while EN provides external enable/disable with 200 kΩ internal pull-down and 1.5 V logic-high threshold.

Key Specifications

Pinout & Package

MP2671DL-LF-P is housed in a thermally enhanced 12-pin QFN package (3 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad connected to GND. Pin 1 is marked by index area on top surface; exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2672DL-LF-Z, MP2671DL-LF-P trades minor OCP accuracy for lower unit cost and broader legacy design adoption; versus BQ297xx, it eliminates external FET and surge protection components - reducing total solution footprint by ~40% in single-cell applications.

Availability

MP2671DL-LF-P is available at Aetrix Electronics and suitable for smartphone charging systems, digital camera power management, and desktop USB charger modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2671DL-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, headquartered in California and serving global markets since 1997.

The MP2671 belongs to MPS's battery protection product line, designed specifically to provide redundant, hardware-based safety layers for single-cell Li-ion systems where failure of the primary charger IC must not compromise battery integrity.

FAQ

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

The ILIM pin sets overcurrent protection threshold using an external resistor to GND. OCP current is calculated as I_OCP = (0.8 V / R_ILIM) × 31250. For example, a 25 kΩ resistor yields 1.0 A typical limit. This current-mirror architecture avoids precision shunt resistors while maintaining programmability across 0.5–2.0 A range.

Can MP2671DL-LF-P be used without the VB pin connection?

No - the VB pin is mandatory for battery overvoltage protection. It connects via RVB (200 kΩ–1 MΩ) to the battery positive terminal to monitor voltage. Omitting this connection disables BOVP function entirely, violating the device's core safety architecture and leaving the battery unprotected against overcharge.

How does the WRN pin behave during simultaneous fault conditions?

WRN asserts low immediately upon detection of the first fault (OVP, BOVP, OCP, or OTP) and remains low until all active faults clear and the internal state machine completes soft-start recovery. It does not encode fault type - system firmware must infer cause via context or external monitoring of VIN, VB, and current.

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. It must be soldered to a dedicated PCB copper pour tied to the main ground plane using ≥4 thermal vias (0.3 mm diameter). This connection lowers θ_JA from 48 °C/W to ~35 °C/W and prevents thermal shutdown under 1 A continuous load.

Does MP2671DL-LF-P support automatic reset after fault clearance?

No - after latched shutdown (e.g., 16 BOVP events), MP2671 requires either full VIN power cycle or EN pin toggle (low→high) to reset internal counters and re-enable. This intentional fail-safe behavior prevents automatic re-engagement in persistent fault conditions, aligning with IEC 62368-1 safety requirements.

What is the minimum recommended input capacitor value, and why?

A minimum 1 µF X5R/X7R ceramic capacitor is required at VIN to suppress high-frequency noise and reduce overshoot during OVP-triggered FET turn-off. Larger values (up to 4.7 µF) further dampen transients from hot-plug events but do not affect OVP timing - the 1 µs response is governed solely by internal comparator propagation delay.

How does the EN pin interact with fault counters?

Toggling EN from low to high resets both 4-bit BOVP and OCP counters to zero and initiates soft-start. This allows controlled recovery after manual intervention or system-level fault diagnosis. Leaving EN floating maintains default enabled state due to internal 200 kΩ pull-down resistor.