Monolithic Power Systems Inc. MP26053DQ-LF-P

Overview

MP26053DQ-LF-P from Monolithic Power Systems is a linear single-cell Li-Ion/Li-Polymer battery charger IC with integrated 28V input surge protection, 10% battery-full threshold, and programmable charge current (200mA–1A). It implements trickle → constant-current → constant-voltage charging, supports NTC-based temperature monitoring, and delivers fault/status indication via open-drain CHG and ACOK pins for portable electronics power management.

For engineers reviewing the MP26053DQ-LF-P datasheet, MP26053DQ-LF-P pinout, MP26053DQ-LF-P application, or MP26053DQ-LF-P equivalent, key selection criteria include its 28V tolerant VIN, 4.20V ±20mV battery regulation accuracy, thermal foldback behavior at ≥120°C, 10-pin QFN (3mm × 3mm) package with exposed thermal pad, and compatibility with standard 50kΩ/10kΩ NTC thermistor networks.

Technical Context

The MP26053 operates in three sequential charge phases-trickle (at 10% ICHG until VBATT ≥2.6V), constant-current (programmed via external R_ISET), and constant-voltage (regulated at 4.20V with ±0.04V tolerance). Charge termination occurs when current drops to 10% of ICHG, and auto-recharge triggers at VBATT ≤4.0V with 100mV hysteresis.

Its internal timer uses an external capacitor on TMR pin to enforce safety limits: 32768 cycles for trickle timeout and 262144 cycles for total charge timeout. Thermal protection reduces average ICHG above 120°C, while NTC monitoring compares voltage at pin 9 against upper (1.76V) and lower (0.38V) thresholds to validate 0°C–50°C battery temperature range.

Key Specifications

Pinout & Package

MP26053DQ-LF-P is housed in a thermally enhanced 10-pin QFN package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad requiring solder connection to PCB ground plane for thermal management and electrical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24075RGTR and TP4056, MP26053DQ-LF-P uniquely integrates 28V surge tolerance, dual-cycle timer, and NTC comparator in a 3mm × 3mm QFN-reducing external component count and enhancing reliability for consumer portable devices.

Availability

MP26053DQ-LF-P is available at Aetrix Electronics and suitable for cell phones, digital cameras, and MP3 players requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP26053DQ-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 conversion, LED drivers, and battery management solutions.

The MP26053 belongs to MPS's linear battery charger product line, designed specifically for cost-effective, space-constrained portable electronics requiring robust input protection, precise voltage regulation, and integrated safety features.

FAQ

What is the maximum input voltage the MP26053DQ-LF-P can withstand without damage?

The MP26053DQ-LF-P features proprietary input surge protection rated to +28V absolute maximum. This allows direct connection to unregulated wall adapters or automotive USB sources without external TVS diodes. Operation is guaranteed only between 3.5V and 6.5V, but transient spikes up to +28V will not damage the IC.

How does the 10% battery-full threshold improve charge accuracy over fixed-voltage termination?

The 10% ICHG threshold dynamically adapts to battery aging and impedance rise, ensuring consistent full-charge detection even as capacity degrades. Unlike fixed-voltage cutoff (e.g., 4.20V alone), it confirms actual current taper-preventing undercharging in high-ESR cells and overcharging in low-impedance packs.

Can the MP26053DQ-LF-P operate without an NTC thermistor?

Yes-the NTC pin (pin 9) can be configured with a fixed 10kΩ resistor to ground if temperature monitoring is not required. The IC will skip NTC validation and proceed with charging. However, this removes critical thermal safety for battery packs operating outside 0°C–50°C, and is not recommended for certified consumer products.

What happens when the MP26053DQ-LF-P enters thermal protection mode?

When junction temperature exceeds ~120°C, the IC reduces average charge current to limit power dissipation. This foldback behavior slows charging but maintains safe operation without shutdown. Recovery occurs automatically once temperature falls below the hysteresis threshold (~105°C), resuming normal CC/CV operation.

Is the TMR pin required for basic charging functionality?

No-the TMR pin can be shorted to GND to disable both trickle and total charge timers. In this configuration, the IC relies solely on the 10% ICHG threshold for termination. However, disabling TMR removes critical safety layers against dead-battery overcharge and indefinite trickle cycling.

How is charge current programmed, and what resistor yields 1A output?

Charge current is set by connecting a resistor (R_ISET) from pin 8 (ISET) to GND. Per the datasheet table, a 1.65kΩ resistor programs 1000mA. Tolerance and temperature drift of the resistor directly affect ICHG accuracy; 1% metal-film resistors are recommended for production designs.