Monolithic Power Systems Inc. MP26053DQ-LF-Z

Overview

MP26053DQ-LF-Z from Monolithic Power Systems is a linear single-cell Li-Ion/Li-Polymer battery charger with integrated 28V input surge protection, 10% battery-full threshold, and programmable charge current (200mA–1A). It operates in trickle/CC/CV modes, includes NTC-based temperature monitoring, thermal foldback, and fault/status indicators (CHG, ACOK), targeting compact portable electronics requiring safe, regulated charging under variable input conditions.

For engineers reviewing the MP26053DQ-LF-Z datasheet, MP26053DQ-LF-Z pinout, MP26053DQ-LF-Z application, or MP26053DQ-LF-Z equivalent, key selection considerations include its 3mm × 3mm QFN10 package, 40µA shutdown current, 7V input OVP, auto-recharge at 4.0V, and precise 4.20V ±20mV battery voltage regulation - all critical for space-constrained, thermally sensitive battery-powered designs.

Technical Context

The MP26053DQ-LF-Z implements a linear charging architecture with internal MOSFET control, supporting three sequential phases: trickle preconditioning (≤2.6V), constant-current (CC) charging up to 1A, and constant-voltage (CV) regulation at 4.20V. Its charge termination logic triggers when current drops to 10% of ICHG, verified by internal current-sense circuitry and timer-backed safety limits.

Thermal management integrates die-temperature sensing with automatic current reduction above 105°C, while NTC monitoring uses a window comparator on the NTC pin (0.35–1.81V thresholds) to enforce 0°C–50°C charging range. Input surge tolerance up to +28V is achieved via proprietary clamping, independent of external components.

Key Specifications

Pinout & Package

MP26053DQ-LF-Z is housed in a thermally enhanced 10-pin 3mm × 3mm QFN package with exposed thermal pad (must be soldered to ground plane). The package supports high power dissipation (θJA = 50°C/W) and meets RoHS requirements.

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-Z delivers superior robustness for variable-input systems-its 28V surge immunity, programmable 200mA–1A charging, integrated NTC window comparator, and dual-status pins reduce external component count and improve field reliability in portable electronics.

Availability

MP26053DQ-LF-Z is available at Aetrix Electronics and suitable for smartphones, digital cameras, and portable medical monitors requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for MP26053DQ-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 design centers in the US, China, and Taiwan.

The MP26053 belongs to MPS's battery management product line, engineered specifically for space-constrained, thermally sensitive portable electronics needing reliable, integrated linear charging with comprehensive safety features.

FAQ

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

The MP26053DQ-LF-Z incorporates proprietary internal clamping that allows it to survive input surges up to +28V without external protection components. However, normal operation is specified for 3.5V to 6.5V input, and the device disables charging if VIN exceeds 7.0V (OVP trip) or falls below 3.0V.

How does the MP26053DQ-LF-Z handle a deeply discharged battery below 2.6V?

When VBATT is below 2.6V, the MP26053DQ-LF-Z initiates trickle charging at 5–15% of the programmed ICHG. If the battery fails to reach 2.6V within 32768 internal oscillator cycles (~1 hour with 2.2µF TMR cap), the charger terminates and signals fault via CHG pin toggle.

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

Yes - the NTC pin must not be left floating, but if temperature monitoring is unused, a fixed 10kΩ resistor from NTC to GND satisfies the bias requirement. The IC will then skip NTC-based fault detection and proceed with normal charging.

What is the purpose of the SS (Soft-Start) pin, and how is it configured?

The SS pin controls inrush current during startup by setting the charge current ramp rate. A capacitor (e.g., 0.1µF) from SS to GND yields ~80ms soft-start time, limiting peak input current and preventing system voltage droop during initial connection.

Does the MP26053DQ-LF-Z support automatic recharge, and at what voltage does it trigger?

Yes - after charge termination, the MP26053DQ-LF-Z automatically resumes charging when battery voltage drops to 4.0V (±0.1V hysteresis). This ensures consistent state-of-charge maintenance without host MCU intervention.

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

Charge current is set by an external resistor (RCHG) from ISET to GND. Per the datasheet table, a 1.65kΩ resistor yields 1000mA. The relationship is approximately ICHG ≈ 3300mA·kΩ / RCHG(kΩ), so 1.65kΩ provides 1A with <±13% variation across temperature and process.