Monolithic Power Systems Inc. MP2670DQ-LF-Z

Overview

MP2670DQ-LF-Z 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), and programmable overcurrent protection (0.9–1.1A range via ILIM resistor). It serves as redundant safety layer between AC adapter and linear charger in portable electronics.

For engineers reviewing the MP2670DQ-LF-Z datasheet, MP2670DQ-LF-Z pinout, MP2670DQ-LF-Z application, or MP2670DQ-LF-Z equivalent, key selection considerations include its 10-pin QFN package, dual open-drain fault indication, thermal shutdown at 150°C with 40°C hysteresis, and compatibility with linear charger systems requiring triple-fault-tolerant protection.

Technical Context

The MP2670 operates as a series protection switch using an internal N-channel MOSFET (R_DS(ON) = 250–450 mΩ) placed between VIN and OUT. Its protection logic monitors three independent parameters-input voltage (via comparator CP1), battery voltage (via CP3), and charge current (via sensing FET Q2 and ILIM resistor)-with dedicated blanking times (170 µs for OCP, 180 µs for BOVP) to suppress transients.

It implements two 4-bit binary counters that permanently disable the power FET after 16 cumulative OCP or BOVP events unless reset by toggling EN or cycling VIN. The EN pin features internal 200 kΩ pull-down and 1.5 V logic-high threshold, enabling system-level control of protection activation without external biasing.

Key Specifications

Pinout & Package

MP2670DQ-LF-Z uses a 10-pin 3 mm × 3 mm QFN package with exposed thermal pad on underside, requiring connection to PCB ground plane for thermal performance and electrical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ29700DRVR and RT9527GQW, MP2670DQ-LF-Z uniquely delivers four-layer protection (OVP, BOVP, OCP, OTP) in one chip, enabling true two-fault-tolerant charging systems without external components-critical for UL/IEC-certified consumer devices.

Availability

MP2670DQ-LF-Z is available at Aetrix Electronics and suitable for smartphones, digital cameras, MP3 players, and PDA devices requiring stable component supply across long-lifecycle consumer electronics programs.

Supply support for MP2670DQ-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, founded in 1997 and headquartered in Kirkland, Washington.

The MP2670 belongs to MPS's battery protection product line, designed specifically to provide certified, fault-tolerant redundancy for linear Li-ion charging systems in space-constrained portable devices.

FAQ

What is the purpose of the two NC pins (4 and 5) on MP2670DQ-LF-Z?

Pins 4 and 5 are unconnected internally and must remain floating per the datasheet. They exist for mechanical symmetry and package standardization-not for thermal relief or ESD protection. Routing traces or placing vias on these pads violates the recommended land pattern and may compromise solder joint integrity or thermal performance.

Can MP2670DQ-LF-Z be used with switching chargers instead of linear chargers?

Yes, but only as input-stage protection. The MP2670 does not regulate charging current or voltage-it acts solely as a smart series switch. When paired with a buck charger, it protects against input surges and overvoltage but cannot replace the charger's own current/voltage control loop or battery-side safety functions like JEITA thermal regulation.

How does the ILIM resistor affect overcurrent protection accuracy?

The ILIM resistor sets OCP threshold via I_OCP = 0.8 V / R_ILIM. With typical R_ILIM tolerance of ±1%, and 0.8 V reference accuracy of ±2%, total OCP error is ±3%. For 1.0 A target, this yields ±30 mA absolute error-sufficient for most Li-ion applications where ±5% current tolerance is acceptable.

Is the FLT pin compatible with 1.8 V microcontrollers?

Yes. With 1 µA leakage and 0.8 V max low-level voltage at 5 mA sink, FLT can drive 1.8 V GPIO directly using a 100 kΩ pull-up. The output remains valid down to 1.2 V supply, satisfying I²C-compatible logic thresholds and enabling interrupt-driven fault logging without level-shifting.

Does MP2670DQ-LF-Z require external capacitors for stable operation?

Yes. C_IN (1–4.7 µF ceramic) is mandatory for input decoupling to suppress hot-insertion overshoot; C_OUT (1 µF) stabilizes the output rail into the charger IC. Omitting either capacitor risks false OVP triggering or unstable OCP response due to voltage droop during load transients.

What happens if the VB pin is shorted to VIN?

The external RVB resistor (200 kΩ–1 MΩ) limits fault current to ≤130 µA in worst-case 30 V–4.2 V differential. This keeps power dissipation below 4 mW at VB pin, preventing thermal damage and allowing downstream circuitry to safely detect and respond to the fault condition without catastrophic failure.