Monolithic Power Systems Inc. MP26056DQ-LF-P

Overview

MP26056DQ-LF-P from Monolithic Power Systems is a linear single-cell Li-ion/Li-polymer battery charger IC with dual-input (USB/AC adapter) support, 28V input surge tolerance, programmable charge current (200mA–1A), ±0.75% battery voltage regulation at 4.2V, and integrated thermal shutdown at 105–135°C. It serves as the primary charging controller in portable consumer electronics requiring automatic input detection and safe CC/CV charge management.

For engineers reviewing the MP26056DQ-LF-P datasheet, MP26056DQ-LF-P pinout, MP26056DQ-LF-P application, or MP26056DQ-LF-P equivalent, key selection criteria include USB/AC auto-current switching via MOD pin, IBF-programmable termination threshold, reverse current blocking (<1µA), ACOK/CHG open-drain status indicators, and QFN10 thermal performance (θJA = 50°C/W).

Technical Context

The MP26056 operates in two distinct constant-current modes: USB mode (MOD = HIGH, ICHG = 1.7/R_ISET1) and AC adapter mode (MOD = LOW, ICHG = 1.7/(R_ISET1∥R_ISET2)), enabling automatic current reduction when powered from USB. Its internal 8.2V overvoltage clamp and 7.0V OVP threshold protect against transient surges up to 28V.

Charge termination is determined by comparing real-time battery current against the IBF threshold (programmed via resistor to ground), while CV regulation maintains VBATT at 4.20V ±16mV across –5°C to +75°C. Thermal protection engages via soft-saturation current limiting-not hard shutdown-ensuring continuous but reduced-rate charging above 105°C.

Key Specifications

Pinout & Package

MP26056DQ-LF-P is housed in a thermally enhanced 10-pin 3mm × 3mm QFN package with exposed thermal pad (Pin 5), optimized for PCB heat dissipation in space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24075RGTR and TP4056, MP26056DQ-LF-P uniquely integrates dual-input current control, 28V surge immunity, and soft thermal limiting-making it optimal for compact, multi-source portable devices demanding reliability and minimal external components.

Availability

MP26056DQ-LF-P is available at Aetrix Electronics and suitable for cell phones, digital cameras, and smart phones requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability in QFN10 format.

Supply support for MP26056DQ-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, battery management, and motor control.

The MP26056 belongs to MPS's battery charger product line, engineered specifically for space-constrained portable electronics needing robust dual-input charging, precision voltage regulation, and integrated thermal safety without external protection circuitry.

FAQ

What is the maximum input voltage the MP26056DQ-LF-P can safely withstand?

The MP26056DQ-LF-P tolerates input surges up to +28V due to integrated clamping circuitry, though its normal operating range is strictly 3.5V to 6.5V. Operation outside this range disables charging, and sustained voltages above 7.2V trigger permanent OVP shutdown until VIN drops below 6.6V (400mV hysteresis).

How does the MOD pin affect charge current programming?

The MOD pin selects between two independent current programming paths: when HIGH, only ISET1 sets ICHG (USB mode, ≤297mA); when LOW, ISET1 and ISET2 operate in parallel to set higher ICHG (AC mode, ≤585mA). This eliminates software-based current switching and ensures hardware-level input source awareness.

Can the MP26056DQ-LF-P charge a deeply discharged battery?

Yes-it includes built-in trickle charge for batteries below 2.8V, followed by constant-current charging once VBATT rises above the recharge threshold (3.9–4.1V). A programmable safety timer prevents indefinite charging of faulty or shorted cells, terminating after timeout unless manually reset.

What is the purpose of the IBF pin, and how is it configured?

The IBF pin programs the battery full charge termination current as a percentage of ICHG (10–50%) using a resistor to GND. The formula is IBF = 1.7V / R_BF. This allows precise adaptation to battery capacity and aging-critical for maintaining cycle life and safety in certified Li-ion systems.

Does the MP26056DQ-LF-P require external MOSFETs or diodes for reverse current protection?

No-reverse battery current is internally limited to <1µA when SHDN = LOW and input is floating or 0V. This eliminates the need for external blocking diodes or load switches, reducing BOM count and forward voltage drop in the charging path.

How does thermal protection behave during high-temperature operation?

Unlike hard thermal shutdown, MP26056DQ-LF-P implements soft thermal limiting: above 105°C, it modulates charge current into a sawtooth waveform, reducing average current while maintaining continuous charging. This avoids abrupt stop/start cycles and preserves user-perceived charging progress.