Monolithic Power Systems Inc. MP26058DQ-LF-Z

Overview

MP26058DQ-LF-Z from Monolithic Power Systems is a linear single-cell Li-ion/Li-polymer battery charger with integrated 28V surge tolerance, programmable 200mA–1A CC/CV charging, LDO mode for system power-up without battery, and thermal/NTC/timer safety protection. It operates from 2.8V–7V input, delivers ±0.75% battery voltage regulation, and uses a 3mm × 3mm QFN-10 package for space-constrained portable electronics.

For engineers reviewing the MP26058DQ-LF-Z datasheet, MP26058DQ-LF-Z pinout, MP26058DQ-LF-Z application, or MP26058DQ-LF-Z equivalent, key selection criteria include input surge rating (28V), LDO-mode system supply capability, programmable IBF threshold (10–50% ICHG), die temperature limiting (105–135°C), and NTC-based 0°C–50°C charging window compliance.

Technical Context

The MP26058 implements dual-mode operation: constant-current (CC) charge until VBATT reaches 4.20V, then transitions to LDO mode maintaining regulated output while reducing current to programmed IBF threshold. Its internal oscillator drives a 262144-cycle timer that terminates charging if full-state is not reached, preventing overcharge of defective cells.

Input surge protection clamps up to +28V, while 7V OVP and 2.2V UVLO ensure safe operation across USB and adapter sources. The IC integrates an NTC comparator with fixed thresholds (32.3kΩ/376.6kΩ) corresponding to 0°C/50°C for TH11-4H104F thermistors, and employs soft thermal shutdown with 10°C hysteresis.

Key Specifications

Pinout & Package

MP26058DQ-LF-Z uses a 10-pin 3mm × 3mm QFN package with exposed thermal pad (Pin 5). Pin functions are validated per MPS Rev. 0.92 datasheet and support compact layout with minimal external components.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24075RGTR and TP4056, MP26058DQ-LF-Z uniquely combines 28V surge tolerance, hardware-enforced thermal/NTC/timer safety, and LDO-mode system supply-enabling robust, battery-optional operation in space-constrained portable electronics without external protection components.

Availability

MP26058DQ-LF-Z is available at Aetrix Electronics and suitable for smartphones, digital cameras, PDAs, and MP3 players requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant packaging.

Supply support for MP26058DQ-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 MP26058 belongs to MPS's battery management product line, engineered specifically for cost-sensitive, space-constrained portable electronics requiring integrated safety, surge resilience, and battery-optional system operation.

FAQ

What is the maximum input voltage the MP26058DQ-LF-Z can safely withstand?

The MP26058DQ-LF-Z features built-in input surge protection rated to +28V. This allows direct connection to unregulated adapters without external TVS diodes. Normal operation is limited to 2.8V–7.0V; voltages above 7.0V trigger overvoltage protection and disable the IC, while sustained 28V surges are tolerated without damage per absolute maximum ratings.

How does the LDO mode function when no battery is connected?

In LDO mode, the MP26058DQ-LF-Z regulates the BATT pin to ~4.2V using the input supply, delivering up to 1A to the system load. This enables full system operation-including firmware boot and diagnostics-even with a missing or fully depleted battery. The LDO remains active as long as valid input (2.8V–7.0V) is present and SHDN is asserted.

Can the timer be disabled, and how is it configured?

Yes, the internal timer can be disabled by shorting the TMR pin (Pin 4) directly to GND. When enabled, the timer runs at 5Hz (set by CTMR capacitor) and counts 262144 cycles (~12.5 hours) before terminating charge if battery full condition is not met. Disabling it removes time-based termination but retains all other safety features including thermal and NTC monitoring.

What NTC thermistor is required for accurate 0°C–50°C temperature monitoring?

The MP26058DQ-LF-Z is calibrated for the TH11-4H104F NTC thermistor (100kΩ at 25°C). Its resistance window-376.6kΩ at 0°C and 32.3kΩ at 50°C-is hard-coded into the IC's comparator. Using this specific part ensures correct thermal cutoff without software calibration; substituting other NTCs requires recalculating resistor values and may invalidate the temperature window.

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

Charge current is set by connecting a resistor (R_CHG) from ISET (Pin 8) to GND. For 1A output, R_CHG = 1.65kΩ per the datasheet table. Valid range is 1.65kΩ–8.66kΩ (1000mA–200mA). The IC maintains ±13% ICHG variation over temperature and input conditions, ensuring stable charging across operating environments.

What happens when the die temperature exceeds the thermal limit?

When junction temperature exceeds 105°C, the MP26058DQ-LF-Z enters soft thermal limiting: charge current is progressively reduced to hold temperature near 120°C, rather than shutting down completely. This preserves partial charging functionality while preventing damage. Recovery occurs automatically once temperature falls below 110°C due to hysteresis, avoiding oscillatory behavior.

Is the MP26058DQ-LF-Z compatible with standard QFN-10 reflow profiles?

Yes, the MP26058DQ-LF-Z uses a standard 3mm × 3mm QFN-10 package with exposed thermal pad and complies with JEDEC J-STD-020 moisture sensitivity level 3. Peak reflow temperature is 260°C, matching industry-standard lead-free profiles. Proper thermal pad soldering to a 6–8-layer PCB with thermal vias is required to achieve θ_JA = 50°C/W and sustain 1A operation.