Monolithic Power Systems Inc. MP26075EQ-41-LF-P

Overview

MP26075EQ-41-LF-P from Monolithic Power Systems is a linear single-cell Li-ion/Li-polymer cradle charger IC with 4.10V battery regulation, 1A constant-current charge capability, and integrated NTC temperature monitoring for plug-in charging systems. It controls AC adapter output voltage via photo-coupler feedback to maximize efficiency in flyback-based cradle chargers for portable consumer electronics.

For engineers reviewing the MP26075EQ-41-LF-P datasheet, MP26075EQ-41-LF-P pinout, MP26075EQ-41-LF-P application, or MP26075EQ-41-LF-P equivalent, this device delivers precise 4.10V battery voltage regulation, programmable 1A charge current via ISET resistor, thermal foldback protection, auto-recharge at 8% VBATT drop, and dual open-drain LED status outputs for real-time charge state indication.

Technical Context

The MP26075EQ-41-LF-P implements a linear charge control architecture with adaptive input voltage regulation-setting VIN = VBATT + 0.5V during fast charge and clamping to 5V otherwise. Its internal oscillator (TMR pin) governs pre-charge (512 cycles), trickle-charge (16,384 cycles), and total charge (262,144 cycles) timers to prevent overcharging of deeply discharged or defective batteries.

It integrates a proprietary NTC window comparator (VNTC_LOW = 0.37V, VNTC_HIGH = 2.16V) for battery temperature supervision, input UVLO (2.0V threshold), input OVP (6.3V), output OVP (4.25V at 4.10V setting), and reverse-battery leakage current <2μA. Charge termination occurs at 10% of programmed ICHG in CV mode.

Key Specifications

Pinout & Package

MP26075EQ-41-LF-P is housed in a thermally enhanced QFN10 package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad for PCB heat dissipation. The package supports ≤2.5W continuous power dissipation at T_A = +25°C (θ_JA = 50°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar linear cradle charger applications.

Compared with BQ24075RGTR and TP4056, MP26075EQ-41-LF-P uniquely supports cradle-specific functions: programmable 4.10V termination, photo-coupler-based adapter voltage control, integrated NTC window comparator, and multi-stage timed charge supervision-making it the only suitable choice for certified, thermally robust cradle designs.

Availability

MP26075EQ-41-LF-P is available at Aetrix Electronics and suitable for smartphone cradle charging, portable media player docking, digital camera battery reconditioning, and PDA hot-sync applications requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.

Supply support for MP26075EQ-41-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, with core expertise in DC/DC converters, LED drivers, motor drivers, and battery management solutions.

The MP26075 belongs to MPS's dedicated battery charger product line, engineered specifically for high-efficiency, safety-certified cradle and dock charging systems where adapter voltage control, thermal supervision, and multi-stage charge algorithms are mandatory.

FAQ

What battery voltage does MP26075EQ-41-LF-P regulate?

MP26075EQ-41-LF-P regulates battery voltage at 4.10V ±40mV over –5°C to +75°C ambient. This value is factory-trimmed and fixed for the -41 variant; other versions (e.g., MP26075EQ) offer 4.05V, 4.15V, or 4.20V options. No external resistor or register adjusts this threshold.

How is charge current programmed on MP26075EQ-41-LF-P?

Charge current is set by connecting a resistor (R_ISET) between the ISET pin and GND. The relationship is I_CHG = 1.23V / R_ISET. For 1A nominal current, use R_ISET = 1.23kΩ (standard 1.7kΩ yields ~0.72A; 1.23kΩ yields ~1.0A). Tolerance and temperature drift of the resistor directly affect accuracy.

Does MP26075EQ-41-LF-P require an external Schottky diode at VIN?

No. MP26075EQ-41-LF-P includes an integrated input reverse-polarity protection circuit that blocks reverse current flow from battery to input when VIN is absent or reversed. This eliminates the need for an external series Schottky diode, reducing BOM count and forward-voltage loss.

What happens if the NTC thermistor becomes disconnected?

If the NTC connection opens or shorts, the NTC pin voltage falls outside the 0.37V–2.16V window, causing immediate charge suspension. The IC holds in this state until voltage re-enters the valid range; no timeout or automatic recovery occurs. LED-R and LED-G both float high to indicate the fault condition.

Can the internal timer be disabled?

Yes. Shorting the TMR pin to GND disables all internal timing functions-including pre-charge, trickle, and total charge timers. In this mode, the device relies solely on voltage thresholds and current sensing for charge control, but loses time-based fault protection against dead batteries.

How does MP26075EQ-41-LF-P control the AC adapter output voltage?

It sinks current from the CTL pin to drive the cathode of an optocoupler, which feeds back to the COMP pin of a primary-side flyback controller. As battery voltage rises, the IC reduces CTL current, decreasing primary-side duty cycle and lowering secondary output-maintaining VIN ≈ VBATT + 0.5V during fast charge for peak efficiency.

What is the maximum allowable input voltage for MP26075EQ-41-LF-P?

The absolute maximum VIN is +28V, but the recommended operating range is 2.2V to 6.3V. Input OVP triggers at 6.3V (typical), disabling the charger. Operation above 6.3V risks permanent damage; sustained operation above 28V violates absolute maximum ratings and may destroy the IC.