Monolithic Power Systems Inc. MP2651GVT-000A-P

Overview

MP2651GVT-000A-P from Monolithic Power Systems is an I²C-controlled buck-boost battery charger IC for 1–4 series Li-ion/Li-polymer cells, supporting 4V–22V input and delivering up to 6A charge current with ±0.5% voltage regulation accuracy, USB PD 3.0-compliant source mode (4V–21V/6A), and integrated N-channel MOSFET drivers. It enables bidirectional power management in portable power banks.

For engineers reviewing the MP2651GVT-000A-P datasheet, MP2651GVT-000A-P pinout, MP2651GVT-000A-P application, or MP2651GVT-000A-P equivalent, key selection criteria include configurable 4-phase charging, dual-mode operation (charge/source), JEITA temperature profiling, thermal regulation at 120°C, and TQFN-30 package compatibility with high-density PCB layouts.

Technical Context

The MP2651 implements a synchronous 4-switch buck-boost topology with seamless mode transitions, enabling battery voltage to sit above or below input voltage while maintaining continuous conduction. Its integrated power FETs (R_DS(on): Q1=10mΩ, Q2=8mΩ, Q3=8mΩ, Q4=20mΩ) support up to 26V sustainable input and 18.68V max battery voltage across 4-cell configurations.

Control is fully digital via I²C/SMBus interface (10–400kHz), allowing real-time configuration of charge parameters (I_IN limit, V_BATT regulation, pre-charge threshold), source mode outputs (V_{IN_SRC}, I_{IN_SRC}), and safety thresholds (thermal, OVP/UVP, NTC-based JEITA). The 10-bit ADC monitors V_BATT, I_CHG, V_IN, and temperature simultaneously in both operating modes.

Key Specifications

Pinout & Package

TQFN-30 (4mm × 5mm, 0.5mm pitch) with exposed thermal pad; RoHS-compliant, halogen-free, MSL Level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck-boost charger applications.

Compared with BQ25792RTWR and ISL9241HRTZ, the MP2651GVT-000A-P uniquely combines 6A bidirectional current, full JEITA implementation, and integrated ACGATE driver-enabling single-chip USB PD 3.0 power banks without external protection components or thermal compensation circuitry.

Availability

MP2651GVT-000A-P is available at Aetrix Electronics and suitable for power banks, wireless speakers, drones, and mobile printers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.

Supply support for MP2651GVT-000A-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 power management ICs, with over 20 years of expertise in DC-DC conversion, battery charging, and motor control solutions.

The MP2651 belongs to MPS's advanced battery management product line, designed specifically for high-efficiency, bidirectional USB PD power banks and portable electronics requiring integrated charge + source functionality in minimal footprint.

FAQ

What is the default factory configuration for MP2651GVT-000A-P?

The "-000A" suffix indicates the factory-default 2-cell configuration, with initial register settings optimized for 7.4V nominal battery packs. This includes pre-programmed V_{BATT_REG} = 8.4V, pre-charge threshold = 3.0V/cell, and JEITA cold/warm thresholds aligned to 0°C/45°C. All parameters remain fully reconfigurable via I²C after power-up.

Does MP2651GVT-000A-P support reverse current blocking during source mode?

Yes - the integrated ACGATE driver controls an external N-channel MOSFET to block reverse current flow from battery to input when source mode is inactive. When enabled, ACGATE provides 6V gate drive referenced to V_ADP, ensuring reliable turn-on of common logic-level MOSFETs with R_DS(on) < 20mΩ.

How does the MP2651 handle battery voltage measurement accuracy across temperature?

The MP2651 uses an internal 1.28V precision reference and 10-bit ADC to digitize battery voltage with ±0.7% total error over –40°C to +70°C. Calibration is performed at wafer test; no system-level trimming is required. Accuracy degrades only marginally at extremes due to package-level thermal gradients, not silicon drift.

Can the MP2651GVT-000A-P operate without an external NTC thermistor?

Yes - NTC functionality is optional. If NTC pins (9,10,8) are left unconnected, the device disables JEITA profiling and thermal charge suspension but retains all other protections (battery OVP/UVP, thermal shutdown at 150°C, and die temperature regulation). NTC floating detection (V_{NTC_FLT} = 95% of V_VNTC) triggers a fault flag.

What is the minimum input voltage required to initiate charging in 4-cell mode?

In 4-cell mode (V_{BATT_REG} = 16.8V), the MP2651 requires VIN ≥ 4.56V to exit input UVLO (configurable down to 4.44V). However, effective buck-boost operation begins only when VIN exceeds the battery's instantaneous voltage by ≥0.5V for stable regulation - so practical minimum is ~17.3V for full 6A charging into a 16.8V battery.

Is the FB pin used in source mode for MP2651GVT-000A-P?

No - in source mode, FB is inactive when V_{IN_SRC} is configured via register (REG09h). It is reserved for optional external feedback if using resistor-divider programming instead of register control. When unused, FB must be floated or tied to AGND to prevent noise coupling into the sensitive analog input path.

How does the MP2651 manage efficiency during low-load source mode operation?

At light loads (<500mA), the MP2651 automatically reduces switching frequency to 500kHz and enters pulse-skipping mode to maintain >85% efficiency down to 10% load. This is controlled by internal load-detection circuitry that monitors I_{IN_SRC} and adjusts f_SW without host intervention or register writes.