Monolithic Power Systems Inc. MP26029GTF-0000-P

Overview

MP26029GTF-0000-P from Monolithic Power Systems is a standalone, linear single-cell Li-ion/Li-polymer battery charger IC with integrated thermal regulation, 1A max charge current, ±0.5% battery voltage accuracy (4.2V), and NTC-based temperature monitoring. It operates from 4.35V–5.5V USB input, supports pre-charge/CC/CV charging, auto-recharge, and safety timer-designed for compact portable electronics requiring autonomous, thermally robust charging.

For engineers reviewing the MP26029GTF-0000-P datasheet, MP26029GTF-0000-P pinout, MP26029GTF-0000-P application, or MP26029GTF-0000-P equivalent, key selection criteria include programmable 30mA–1A charge current via ISET resistor, input voltage limit regulation to prevent source collapse, on-chip thermal limiting at 120°C, and OTP-configurable parameters including VBATT_REG, ITERM, and TJ_REG.

Technical Context

The MP26029GTF-0000-P implements a fully autonomous linear charging architecture with integrated IN-to-BATT MOSFET (RON_BATT = 450 mΩ in SOT563), eliminating external blocking diodes. Its control loop combines constant-current regulation (via ISET resistor feedback) and constant-voltage regulation (VBATT_REG = 4.2V ±0.5%) with automatic transition between pre-charge, fast-charge, and CV phases.

Thermal regulation is implemented via real-time junction temperature sensing and dynamic current reduction at 120°C, while independent NTC monitoring uses voltage-ratio comparison against internal reference dividers (VCOLD = 61.5% VIN, VHOT = 28.5% VIN) to suspend charging outside user-defined cold/hot thresholds. Input voltage limit regulation activates when VIN drops to 4.5V, reducing ICC to maintain stability.

Key Specifications

Pinout & Package

MP26029GTF-0000-P is housed in a 6-pin SOT563 package (1.6 mm × 1.6 mm, 0.5 mm pitch), optimized for space-constrained portable designs. Thermal pad is not present; power dissipation limited to 0.96 W at TA = +25°C (θJA = 130°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TP4056 and BQ24075, MP26029GTF-0000-P delivers superior thermal safety via on-die regulation and flexible configuration through OTP-enabling drop-in reliability in space-constrained, thermally demanding applications without firmware or external logic.

Availability

MP26029GTF-0000-P is available at Aetrix Electronics and suitable for smart wearables, Bluetooth audio devices, portable medical sensors, and IoT remote terminals requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP26029GTF-0000-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 manufacturing partnerships.

The MP26029 belongs to MPS's battery management IC product line, engineered specifically for autonomous, thermally aware, single-cell Li-ion charging in ultra-compact portable electronics where size, safety, and self-sufficiency are critical.

FAQ

What is the function of the ISET pin, and how is charge current calculated?

The ISET pin sets the constant-current charge level via an external resistor to GND. Charge current follows I_CC = 3200/(R_ISET − 1.05 kΩ) mA, where R_ISET is in kΩ. For 1 A, R_ISET = 3.01 kΩ (1% tolerance). Floating ISET disables charging entirely-no pull-up or pull-down is allowed.

Does MP26029GTF-0000-P support charging from sources above 5.5 V?

Yes-it accepts input up to 13 V, but includes input over-voltage protection triggered at 6.25 V (OTP-default). When VIN exceeds this threshold, the internal MOSFET turns off immediately. The 4.35–5.5 V range is specified for USB compliance; higher inputs require careful OVP validation and thermal derating.

How does the NTC temperature monitoring work without external ADC or MCU?

The MP26029 compares the voltage at the NTC pin-generated by an external thermistor/resistor divider-to internal reference ratios (VCOLD = 61.5% VIN, VHOT = 28.5% VIN). No external conversion is needed; violation of either threshold suspends charging and asserts STAT blink, all autonomously.

Can the battery regulation voltage be changed from the default 4.2 V?

Yes-VBATT_REG is OTP-programmable to 3.6 V, 3.8 V, 4.1 V, 4.2 V (default), 4.3 V, 4.35 V, or 4.4 V. This is performed at the factory; "0000" in the part number indicates the default 4.2 V setting. Custom OTP values require coordination with an MPS FAE.

What is the purpose of the input voltage limit regulation feature?

When the input source (e.g., weak USB port) cannot sustain the programmed charge current, VIN sags. At the configured VIN_MIN threshold (4.5 V default), the MP26029 dynamically reduces ICC to prevent further voltage collapse-ensuring stable operation without resetting host systems or triggering UVLO.

Is thermal regulation active during pre-charge and CV phases?

Yes-thermal regulation applies continuously across all charging phases. If junction temperature reaches 120°C, charge current is reduced regardless of phase. This protects both battery and IC during high-ambient conditions or poor PCB thermal design, unlike chargers that only regulate in CC mode.

What capacitor values are mandatory for stable operation?

A minimum 4.7 µF ceramic capacitor (X5R/X7R) must be placed between IN and GND; a ≥20 µF ceramic capacitor is required between BATT and GND. Both must be located as close as possible to their respective pins to minimize inductance and ensure loop stability under transient loads.