Monolithic Power Systems Inc. MP26060EQ-LF-Z

Overview

MP26060EQ-LF-Z from Monolithic Power Systems is a linear single-cell Li-ion battery charger IC with integrated 24V input surge tolerance, programmable 85mA–1A constant-current charging, 4.15V ±0.75% constant-voltage regulation, and trickle-charge preconditioning for deeply discharged batteries. It delivers charge status (CHG) and AC adapter power-good (ACOK) signals to host systems in portable electronics.

For engineers reviewing the MP26060EQ-LF-Z datasheet, MP26060EQ-LF-Z pinout, MP26060EQ-LF-Z application, or MP26060EQ-LF-Z equivalent, key selection criteria include input surge rating (24V), battery voltage accuracy (±0.75%), reverse current blocking (<1µA), thermal shutdown threshold (105–135°C), and QFN10 (3mm × 3mm) package compatibility with space-constrained PCB layouts.

Technical Context

The MP26060EQ-LF-Z implements a dual-stage linear charging architecture: trickle mode activates below 2.6V battery voltage, followed by constant-current (CC) mode up to 4.15V, then transitions to constant-voltage (CV) mode with programmable termination at IBF (10–50% of ICHG). Its proprietary OVP circuit clamps at 7.0V with 400mV hysteresis and disables charging outside 2.5–6.5V VIN range.

Thermal management uses a soft thermal shutdown mechanism that modulates charge current into a saw-tooth waveform rather than hard cutoff, preserving partial functionality during sustained high-power dissipation. The SS pin enables external capacitor-programmed soft-start (10–35ms) to limit inrush, while EN pin logic (active-low enable) supports system-level power sequencing.

Key Specifications

Pinout & Package

MP26060EQ-LF-Z is housed in a thermally enhanced 10-pin QFN package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad connected to GND. The package supports ≤2.5W continuous power dissipation at TA = +25°C (θJA = 50°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24075RGTR and TP4056, MP26060EQ-LF-Z uniquely combines 24V surge immunity, 4.15V ±0.75% regulation, and dual open-drain status outputs-making it optimal for industrial handhelds and ruggedized portable gear where input transients and battery longevity are critical.

Availability

MP26060EQ-LF-Z is available at Aetrix Electronics and suitable for smartphones, digital cameras, MP3 players, and PDAs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP26060EQ-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, with core expertise in DC/DC converters, LED drivers, motor drivers, and battery management solutions.

The MP26060 belongs to MPS's linear battery charger product line, designed specifically for space-constrained portable electronics needing robust input protection, precision voltage regulation, and intelligent charge state signaling without external controllers.

FAQ

What input voltage range does MP26060EQ-LF-Z support during normal operation?

The MP26060EQ-LF-Z operates continuously with input voltages from 3.5V to 6.5V. It tolerates transient surges up to 24V without damage, but disables charging outside the 2.5V–6.5V window-indicated by the ACOK pin going high-impedance. This dual-range behavior ensures compatibility with both USB and unregulated wall adapters while protecting downstream circuitry.

How is the 4.15V battery regulation voltage trimmed and how stable is it over temperature?

The 4.15V regulation is factory-trimmed with ±0.75% accuracy at +25°C and maintains ±0.75% over –5°C to +75°C, verified in the Electrical Characteristics table. No external calibration is required-the value is laser-trimmed on-die and remains stable across voltage, load, and process variations without user adjustment.

Can MP26060EQ-LF-Z charge a battery if the input voltage is lower than the battery voltage?

No. The device automatically disables charging when VIN falls below VBATT to prevent reverse current flow from battery to input. This behavior is inherent to the internal power path architecture and requires no external circuitry-ensuring zero risk of battery discharge through the charger during adapter removal or brownout conditions.

What is the function of the SS pin and how does it affect startup behavior?

The SS (Soft-Start) pin connects to a 0.1µF capacitor to control the ramp rate of charge current during startup. This limits inrush current to prevent USB port overcurrent faults or input rail droop. With CSS = 0.1µF, soft-start time is 10–35ms, reaching 90% of programmed ICHG-enabling predictable, glitch-free system initialization.

Does MP26060EQ-LF-Z provide battery temperature monitoring, and if so, how is it implemented?

Yes-the device monitors battery temperature indirectly via the IBF and ISET pins' resistor networks, which are sensitive to thermal drift. While it lacks dedicated NTC inputs, its thermal protection circuitry (105–135°C shutdown with 10°C hysteresis) and saw-tooth current modulation respond directly to die temperature, providing robust overtemperature defense without external sensors.

How does the CHG pin behave during different charge states?

The CHG pin is an open-drain output pulled low during active CC or CV charging. It transitions to high-impedance (floating) when charging terminates (IBF reached), when EN is high, when VIN is out-of-range, or when thermal shutdown activates. This allows direct LED drive or MCU GPIO monitoring without external pull-ups in most configurations.

Is the exposed thermal pad electrically isolated or must it be connected to GND?

The exposed pad is electrically connected to the internal GND plane and must be soldered to the PCB's GND copper area. It serves both thermal conduction (reducing θJA by ~38°C/W) and electrical grounding-leaving it unconnected violates the Absolute Maximum Ratings and risks thermal runaway or EMI issues.