Monolithic Power Systems Inc. MP2606DQ-LF-Z

Overview

MP2606DQ-LF-Z from Monolithic Power Systems is a single-cell linear Li-ion battery charger IC with integrated 28V input surge protection, programmable 85mA–1A constant-current charging, ±0.75% battery voltage regulation at 4.2V, thermal shutdown (105–135°C), and reverse current blocking (<1µA). It operates in CC/CV mode and delivers charge status (CHG) and AC adapter power-good (ACOK) signals for portable electronics.

For engineers reviewing the MP2606DQ-LF-Z datasheet, MP2606DQ-LF-Z pinout, MP2606DQ-LF-Z application, or MP2606DQ-LF-Z equivalent, key selection criteria include input surge tolerance, programmable termination threshold (IBFL), soft-start timing control via external capacitor, thermal foldback behavior, and QFN10 package thermal resistance (θJA = 50°C/W).

Technical Context

The MP2606DQ-LF-Z implements a dual-loop analog control architecture: a precision bandgap-referenced CV loop maintains 4.2V ±0.75% across temperature (–5°C to +75°C), while a resistor-programmed CC loop regulates charge current from 85mA to 1A using ISET pin feedback. Battery full detection occurs when charge current drops to IBFL (10–50% of ICHG), triggering CHG pin high-impedance state.

Input protection includes automatic disable below 2.5V or above 7.0V, with open-drain ACOK asserting low only within that window. Thermal management uses proprietary foldback-reducing average current to a sawtooth waveform above 120°C junction temperature-while soft-start time (10–35ms) is set by SS pin capacitor value.

Key Specifications

Pinout & Package

MP2606DQ-LF-Z is housed in a thermally enhanced 10-pin 3mm × 3mm QFN package with exposed thermal pad (JEDEC MO-229 VEED-5 compliant). The package supports θJA = 50°C/W and θJC = 12°C/W on standard 1"² 1oz copper PCB.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-cell linear Li-ion charger applications.

Compared with BQ24075RGTR and TP4056, MP2606DQ-LF-Z uniquely combines 28V surge tolerance, programmable IBFL/ICHG, dual status outputs (CHG/ACOK), and thermal foldback-making it optimal for compact, robust, host-aware portable chargers.

Availability

MP2606DQ-LF-Z is available at Aetrix Electronics and suitable for cell phones, smart phones, MP3/multimedia players, and digital cameras requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2606DQ-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 mixed-signal ICs for power management, motion control, and automotive applications.

The MP2606 belongs to MPS's battery management product line, designed specifically for space-constrained, cost-sensitive portable electronics requiring robust, programmable single-cell Li-ion charging with minimal external components.

FAQ

What is the maximum input voltage the MP2606DQ-LF-Z can tolerate without damage?

The MP2606DQ-LF-Z features integrated input surge protection rated up to +28V on the IN pin. This absolute maximum rating is specified in the datasheet and allows direct connection to unregulated 12V or 24V adapter rails without external TVS diodes. Operation outside the recommended 3.5–6.5V range will disable charging but does not cause permanent damage if duration and energy remain within SOA limits.

How is the charge termination current (IBFL) programmed, and what is its functional range?

IBFL is programmed by connecting a resistor RBFL from the IBFL pin to GND. Per the datasheet, IBFL = (1.7kΩ / RBFL) × 1A, yielding a programmable range of 10–50% of the programmed ICHG. For example, with ICHG = 800mA and RBFL = 3.4kΩ, IBFL = 500mA. This threshold determines when the CHG pin transitions to high-impedance, signaling battery full condition.

Does the MP2606DQ-LF-Z support trickle charging for deeply discharged batteries?

No-the MP2606DQ-LF-Z explicitly omits trickle charge functionality, as stated in its product title and datasheet description. It initiates constant-current charging immediately upon enable if battery voltage exceeds the UVLO threshold (~2.6V). Batteries below this level require pre-conditioning via external circuitry before MP2606DQ-LF-Z engagement.

What thermal management features prevent overheating during high-current charging?

The MP2606DQ-LF-Z employs proprietary thermal foldback: when junction temperature exceeds 120°C, it modulates charge current into a sawtooth waveform instead of DC, reducing average power dissipation. Hysteresis (10°C) ensures stable recovery. Designers can mitigate thermal stress by lowering VIN, increasing copper area under the exposed pad, or reducing ICHG via RCHG.

Can the MP2606DQ-LF-Z operate without a battery connected to the BATT pin?

Yes-the MP2606DQ-LF-Z is designed to start up and remain stable even with no battery attached. In this condition, the BATT pin floats at ~4.2V due to internal regulation, and the CHG pin remains low. This capability simplifies factory test modes and enables pre-charge validation before battery insertion.

How does the ACOK pin function, and what voltage thresholds trigger its state change?

The ACOK pin is an open-drain output that pulls low only when VIN is within 2.5V to 7.0V-indicating valid AC adapter or USB power. Below 2.5V or above 7.0V, ACOK floats high. This window aligns with USB 2.0 (4.75–5.25V) and common 5V/6V wall adapters, enabling simple host-side power-source validation without ADC polling.

Is the MP2606DQ-LF-Z RoHS-compliant and halogen-free?

Yes-the "-LF" suffix in MP2606DQ-LF-Z denotes lead-free and RoHS-compliant packaging per EU Directive 2011/65/EU. The device meets JEDEC J-STD-020 moisture sensitivity level (MSL) 3 and is halogen-free per IEC 61249-2-21, with bromine and chlorine content <900 ppm each.