Monolithic Power Systems Inc. MP26057DQ-LF-P

Overview

MP26057DQ-LF-P from Monolithic Power Systems is a linear single-cell Li-ion/Li-polymer travel charger IC with integrated 28V input surge tolerance, programmable 200mA–1A constant-current charging, and full CC/CV regulation. It delivers 4.20V ±0.75% battery voltage accuracy, supports trickle preconditioning below 2.6V, and includes die temperature limiting, NTC-based battery thermal monitoring (0°C–50°C), and dual LED status indication for portable consumer electronics.

For engineers reviewing the MP26057DQ-LF-P datasheet, MP26057DQ-LF-P pinout, MP26057DQ-LF-P application, or MP26057DQ-LF-P equivalent, key selection criteria include its 3mm × 3mm QFN10 package, 3.5V–7V input range compatible with USB/adapter sources, programmable timer for dead-battery protection, and open-drain GRN/RED status outputs driving tri-color LED indicators.

Technical Context

The MP26057DQ-LF-P implements a fully autonomous linear charge controller with three-phase operation: trickle charge (10% I_CHG) for deeply discharged batteries (<2.6V), constant-current (CC) mode up to 1A, then constant-voltage (CV) regulation at 4.20V with termination at programmable I_BF threshold. Its internal oscillator drives a cycle-counting timer (32,768 cycles for trickle, 262,144 for total charge) to enforce safe timeout limits.

Thermal management uses soft thermal shutdown (105°C–135°C trip range with 10°C hysteresis) that modulates current into a sawtooth waveform rather than hard cutoff, preserving partial functionality under thermal stress. Battery temperature sensing employs an external 100kΩ NTC thermistor with window-comparator logic detecting R_NTC <32.3kΩ (hot) or >376.6kΩ (cold), corresponding to TH11-4H104F characteristics.

Key Specifications

Pinout & Package

MP26057DQ-LF-P is housed in a 10-pin 3mm × 3mm QFN package with exposed thermal pad (pin 5). The package supports high-density PCB layouts and efficient heat dissipation via the soldered exposed pad connected to system ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24075RGTR and TP4056, MP26057DQ-LF-P uniquely combines 28V surge resilience, full programmability (I_CHG, I_BF, timer), and integrated NTC/thermal safety-making it the only option qualified for unregulated travel adapter use across consumer temperature ranges.

Availability

MP26057DQ-LF-P is available at Aetrix Electronics and suitable for smartphones, digital cameras, portable media players, and Bluetooth headsets requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP26057DQ-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP26057 belongs to MPS's battery management IC product line, engineered specifically for compact, high-reliability linear Li-ion charging in portable consumer electronics where input surge resilience, thermal safety, and autonomous operation are critical.

FAQ

What input voltage range does MP26057DQ-LF-P support, and how does it handle overvoltage?

MP26057DQ-LF-P operates from 3.5V to 7V nominal input and tolerates transient surges up to 28V without damage or latch-up, thanks to integrated input protection circuitry. It automatically disables when VIN falls below 3.0V or exceeds 7.2V (OVP threshold), and resumes operation once voltage returns to the valid range.

How is charge current programmed, and what is the accuracy over temperature?

Charge current is set by connecting a resistor from the ISET pin to GND, with values from 1.65kΩ (1A) to 15kΩ (100mA). Over temperature (0°C to +120°C) and supply variation, I_CHG maintains ±13% accuracy relative to the programmed value, verified per datasheet Table 1 and Figure 3.

Does MP26057DQ-LF-P support battery temperature monitoring, and how is it implemented?

Yes-it includes a dedicated NTC pin (pin 9) that interfaces with a 100kΩ NTC thermistor (e.g., TH11-4H104F) to monitor battery temperature. The IC compares the thermistor resistance against thresholds corresponding to 0°C (376.6kΩ) and 50°C (32.3kΩ), halting charge outside this window.

What happens during thermal overload, and how does the device recover?

At die temperatures between 105°C and 135°C, MP26057DQ-LF-P enters soft thermal limiting: charge current modulates into a sawtooth waveform with reduced average amplitude, avoiding hard shutdown. Recovery occurs automatically as junction temperature drops below the hysteresis threshold (typically 10°C below trip point).

Can the timer function be disabled, and what is its role in safety?

Yes-the timer is disabled by shorting the TMR pin (pin 4) to GND. When active, it enforces two hardware timeouts: 32,768 cycles (~6.5 hours at 5Hz) for trickle mode and 262,144 cycles (~52 hours) for total charge duration, preventing unsafe prolonged charging of defective or dead batteries.

What are the LED status indications, and how are they driven?

GRN (pin 2) and RED (pin 3) are open-drain outputs sinking up to 5mA each. Their states encode conditions: GRN ON + RED OFF = charging; GRN OFF + RED ON = VIN overvoltage or NTC fault; both flashing = timer timeout or thermal fault; both OFF = full charge or standby.

Is MP26057DQ-LF-P compatible with Li-polymer batteries, and what voltage regulation does it provide?

Yes-it is explicitly qualified for both single-cell Li-ion and Li-polymer batteries. It regulates battery voltage to 4.20V ±0.75% over –5°C to +75°C, meeting JEITA and IEC 62133 requirements for precision cell termination and longevity.