Monolithic Power Systems Inc. MP2671DL-LF-Z

Overview

MP2671DL-LF-Z 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 smartphone and digital camera charging systems to prevent catastrophic battery failure.

For engineers reviewing the MP2671DL-LF-Z datasheet, MP2671DL-LF-Z pinout, MP2671DL-LF-Z application, or MP2671DL-LF-Z equivalent, key selection criteria include programmable OCP via ILIM resistor, ±30 mV BOVP hysteresis, integrated 170 µs OCP blanking time, thermal latch-off at 140 °C with 90 °C recovery, and compatibility with linear chargers such as MP2602 family devices.

Technical Context

The MP2671 operates as a redundant safety layer between the AC adapter and primary charger IC, using internal N-channel MOSFET (R_DS(ON) = 280 mΩ max) to disconnect VIN from OUT during fault events. Its protection logic relies on three independent comparators (CP1 for OVP, CP2 for OCP, CP3 for BOVP), each with built-in blanking timers (1 µs, 170 µs, 180 µs) and 4-bit latching counters that permanently disable the FET after 16 cumulative faults unless reset by EN toggle or power cycle.

It implements analog current sensing via a 31,250:1 mirrored FET ratio, enabling precise OCP programming with external R_ILIM; monitors VB through high-impedance input (20 nA leakage) with user-selected RVB divider; and incorporates POR (2.58 V typ) with 110 mV hysteresis and soft-start delay (~10 ms) to suppress hot-insertion transients before enabling the power path.

Key Specifications

Pinout & Package

MP2671DL-LF-Z uses a 12-pin 3 mm × 4 mm QFN package with exposed thermal pad (to be connected to GND). Pin 1 is marked by a dot or notch; pins 5, 6, and 12 are no-connect and must remain floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2672DL-LF-Z, the MP2671DL-LF-Z provides stricter fault containment via permanent latch, while BQ29700DRVR demands additional discrete elements to achieve comparable protection coverage - making MP2671 optimal for space-constrained, safety-critical consumer Li-ion applications.

Availability

MP2671DL-LF-Z is available at Aetrix Electronics and suitable for smartphone charging protection, digital camera power management, MP3 player battery safety, and desktop USB charger modules requiring stable component supply across production lifecycles.

Supply support for MP2671DL-LF-Z 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 for power conversion, motor control, and battery management.

The MP2671 belongs to MPS's battery protection product line, designed specifically to provide certified-safe, redundant overvoltage, overcurrent, and thermal protection for single-cell Li-ion systems in portable electronics.

FAQ

What is the purpose of the RVB resistor in the MP2671DL-LF-Z application circuit?

The RVB resistor (200 kΩ–1 MΩ) connects the VB pin to the battery positive terminal and serves two critical roles: it limits fault current if the VB pin shorts to VIN (e.g., during IC failure), and it forms a voltage divider that allows accurate battery voltage sensing despite the IC's 20 nA VB pin leakage. With 200 kΩ, worst-case error is only 4 mV - well within BOVP tolerance.

Can the MP2671DL-LF-Z be used without an external ILIM resistor?

No. The ILIM pin requires an external resistor to GND to set the overcurrent protection threshold. Without it, the OCP function is undefined and will not operate reliably. The datasheet specifies R_ILIM = 25 kΩ for 1.0 A trip; values from 10 kΩ to 100 kΩ yield 0.4 A to 2.5 A range per the formula I_OCP = 0.8 V × 31250 / R_ILIM.

How does the WRN pin behave during simultaneous fault conditions?

The WRN pin is a wired-OR open-drain output that asserts low whenever any one of the four protection events occurs - input OVP, battery BOVP, overcurrent OCP, or overtemperature OTP. It remains low for the duration of the fault and clears only after the condition is resolved *and* the internal fault counter resets (via EN toggle or power recycle).

Is the MP2671DL-LF-Z compatible with lithium iron phosphate (LiFePO₄) batteries?

No. The MP2671DL-LF-Z is calibrated for Li-ion/Li-polymer chemistry with a fixed 4.34 V BOVP threshold and 30 mV hysteresis. LiFePO₄ cells require ~3.65 V cutoff; using this IC would prematurely terminate charging and reduce usable capacity. It is not configurable for alternate chemistries.

What is the significance of the 10 ms soft-start delay after power-on reset?

The 10 ms delay after POR (2.58 V) allows input transients - especially from hot-plug events - to settle before enabling the internal MOSFET. This prevents false OVP triggering during initial power application and ensures stable turn-on of the protected power path, improving system robustness in real-world USB insertion scenarios.

Does the MP2671DL-LF-Z support reverse polarity protection?

No. The MP2671DL-LF-Z does not include reverse polarity protection. Its VIN pins are unidirectional and rated only for positive voltage up to +30 V. Reverse input voltage will damage the device. External diode or ideal diode controller must be added upstream if reverse polarity risk exists.