Monolithic Power Systems Inc. MP26124GR-P

Overview

MP26124GR-P from Monolithic Power Systems is a monolithic 4-series Li-ion battery switching charger IC with integrated high-side MOSFET, 24V input capability, 2A programmable charge current, ±0.75% battery voltage regulation accuracy, and fixed 600kHz switching frequency-designed for clean robots and drone battery management systems.

For engineers reviewing the MP26124GR-P datasheet, MP26124GR-P pinout, MP26124GR-P application, or MP26124GR-P equivalent, key selection criteria include 4S Li-ion charge profile compliance (trickle → CC → CV), NTC-based thermal monitoring, programmable safety timer, and QFN-16 package thermal performance in space-constrained portable power designs.

Technical Context

The MP26124GR-P implements peak-current-mode control with dual-loop regulation: COMPI governs constant-current (CC) charging via CSP–BATT sense resistor feedback, while COMPV manages constant-voltage (CV) regulation at 16.8V nominal for 4S Li-ion packs. It integrates a 0.2Ω high-side MOSFET and internal 3.3V LDO (VREF33) for biasing external circuitry.

Operation includes automatic mode transitions-trickle charge below 12.0V (3.0V/cell), CC until VBATT reaches 16.8V, then CV until termination at 5–15% of ICC-and fault handling via cycle-by-cycle OCP, thermal shutdown at 150°C, and NTC window comparator (64.2–66.2% and 34–36% of VREF33).

Key Specifications

Pinout & Package

MP26124GR-P is housed in a thermally enhanced QFN-16 (4mm × 4mm) package with exposed thermal pad, optimized for PCB heat dissipation in high-current battery charging applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4S Li-ion switching charger applications.

Compared with BQ24618RTWR and ISL9238HRZ-T, MP26124GR-P offers lowest component count for 4S applications, integrated thermal sensing without ADC, and minimal footprint - ideal for cost-sensitive, space-constrained portable equipment where analog reliability outweighs digital configurability.

Availability

MP26124GR-P is available at Aetrix Electronics and suitable for autonomous clean robots, commercial drones, industrial handheld scanners, and mobile medical diagnostic tools requiring stable component supply and long-term production continuity.

Supply support for MP26124GR-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 across Asia and North America and global distribution infrastructure.

The MP26124 belongs to MPS's battery management IC product line, engineered specifically for high-efficiency, single-chip switching chargers targeting 2–4S Li-ion applications in robotics, UAVs, and portable industrial equipment.

FAQ

What is the maximum supported battery voltage and how is it regulated?

The MP26124GR-P regulates terminal battery voltage to 16.8V nominal for 4S Li-ion packs, with ±0.75% accuracy over temperature and line. This is achieved via COMPV-controlled CV mode using internal 1.2V reference trimmed with 5-bit DAC, ensuring compliance with standard 4.2V/cell specifications without external feedback resistors.

How does the NTC thermistor interface function without external ADC?

The MP26124GR-P integrates a precision window comparator that monitors NTC voltage relative to fixed percentages (64.2–66.2% and 34–36%) of its internal 3.3V VREF33. With only two external resistors (R3, R6) forming a divider with the thermistor, it directly halts charging if voltage falls outside the window - eliminating need for microcontroller ADC sampling.

Can the MP26124GR-P charge a fully depleted battery below 12V?

Yes - the MP26124GR-P initiates trickle charge at 10% of the programmed CC current when VBATT < 12.0V (3.0V/cell), ramping up to full CC once voltage exceeds the threshold. It also includes a 30-minute trickle timeout to prevent indefinite low-current charging of faulty cells.

What is the role of the TMR pin and how is timing configured?

The TMR pin sources/sinks a precise 0.1µA current to charge/discharge an external capacitor to ground. A 0.1µF capacitor sets both 30-minute trickle and 3-hour total charge timeouts. The timer resets automatically during auto-recharge events, ensuring safety without firmware intervention.

Does the device support automatic recharge after full charge?

Yes - after reaching full charge (IBF ≤ 10% ICC), the MP26124GR-P enters low-leakage standby, monitoring VBATT continuously. If voltage drops to 16.0V (4.0V/cell), it restarts the full CC/CV cycle with soft-start, resetting the safety timer to prevent overcharge accumulation.

What package thermal characteristics enable 2A operation in QFN-16?

The QFN-16 (4mm × 4mm) package features an exposed thermal pad with θ_JA = 46°C/W on a 4-layer JEDEC board. Combined with the 0.2Ω integrated MOSFET and 90% peak efficiency, this allows continuous 2A charging at TA = 25°C with ≤2.7W power dissipation before thermal shutdown activates.

How is charge current programmed and what tolerance should be expected?

Charge current is set by external sense resistor RS1 using I_CHG = 200mV / RS1. With RS1 = 100mΩ, nominal current is 2A. Total error includes ±5% RS1 tolerance, ±1% VSENSE reference, and ±1% gain error - resulting in ±7% overall current accuracy across temperature and line conditions.