Monolithic Power Systems Inc. MP2651GVT-0000-Z

Overview

MP2651GVT-0000-Z 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, up to 6A), and integrated thermal regulation. It enables bidirectional power management in portable power banks and multi-cell USB PD devices.

For engineers reviewing the MP2651GVT-0000-Z datasheet, MP2651GVT-0000-Z pinout, MP2651GVT-0000-Z application, or MP2651GVT-0000-Z equivalent, key selection considerations include configurable IIN/VIN limits, JEITA-compliant battery temperature protection, reverse source mode resolution (20mV/step VIN_SRC, 50mA/step IIN_SRC), and TQFN-30 package thermal performance (θJA = 38°C/W).

Technical Context

The MP2651 implements a synchronous four-switch buck-boost topology with seamless mode transitions, enabling battery voltage to sit above or below input voltage while maintaining high efficiency across 1–4 cell configurations. Its integrated 10-bit ADC monitors VBAT, VIN, charge/discharge current, and die temperature in real time.

Charge sequencing includes trickle/pre-fast/constant-current/constant-voltage phases with auto-recharge and programmable termination; source mode supports precise IN output voltage (VIN_SRC) and current (IIN_SRC) regulation via I²C/SMBus registers, with OVP/UVP protection active in both directions.

Key Specifications

Pinout & Package

MP2651GVT-0000-Z is housed in a thermally enhanced TQFN-30 (4mm × 5mm) package with exposed thermal pad. Pin functions are validated per MP2651 Rev. 1.2 datasheet Figure 5 and Pin Functions table.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ25792RTWR and ISL9241IRZ-T, MP2651GVT-0000-Z uniquely delivers full USB PD 3.0–compliant source mode (4–21V/6A) alongside 6A charging in one TQFN-30 package, eliminating external boost circuitry and simplifying BOM for portable bidirectional power systems.

Availability

MP2651GVT-0000-Z is available at Aetrix Electronics and suitable for power banks, wireless speakers, drones, and mobile printers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2651GVT-0000-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 power management ICs, with over two decades of expertise in DC/DC conversion, battery management, and motor drivers.

The MP2651 belongs to MPS's advanced battery charger product line, designed specifically for high-efficiency, bidirectional, multi-cell portable applications where USB PD compliance and thermal robustness are critical.

FAQ

What is the function of the TS/IMON pin on MP2651GVT-0000-Z?

The TS/IMON pin is a dual-function terminal configurable via register settings: as a temperature-sense input (TS) for NTC-based battery thermal monitoring, or as an analog current monitor output (IMON) that provides a voltage proportional to charge current in charge mode or discharge current in source mode. Its design enables shared PCB routing for thermal and current sensing without additional pins.

Does MP2651GVT-0000-Z support USB PD communication directly?

No, MP2651GVT-0000-Z does not implement USB PD protocol negotiation. It supports USB PD 3.0–compliant electrical behavior in source mode-delivering programmable 4V–21V output with OVP/UVP and SCP-but requires an external PD controller (e.g., CYPD3177) to handle BMC signaling and policy engine functions.

How is battery cell count configured on MP2651GVT-0000-Z?

Cell count is set at factory via OTP programming (e.g., "-000A" = 2-cell default) and stored in internal registers. Users can modify it dynamically through I²C writes to REG0Bh bits[3:2], selecting 1–4 cells. The setting directly scales battery voltage regulation range (e.g., 4.67V/cell × 2 = 9.34V full-charge target) and JEITA thresholds.

What thermal protection mechanisms does MP2651GVT-0000-Z provide?

MP2651GVT-0000-Z implements three-tier thermal protection: configurable thermal regulation (threshold adjustable from 80°C to 120°C), fixed thermal shutdown at 150°C with 20°C hysteresis, and real-time die temperature monitoring via its integrated 10-bit ADC. All are active in both charge and source modes and report status via INT pin and I²C registers.

Can MP2651GVT-0000-Z operate without an external NTC thermistor?

Yes. While NTC support enables JEITA-compliant charging, the device operates safely without it: NTC floating detection triggers a fault flag but does not halt charging unless enabled in register REG0Dh. Battery UVLO, OVP, and thermal regulation remain fully functional using only internal sensors and voltage-based protections.

What is the purpose of the ACGATE pin and how is it used?

The ACGATE pin drives the gate of an external N-channel MOSFET placed between the input adapter and the IN pin. It enables input over-voltage protection (OVP) by turning off the pass FET when ADP voltage exceeds the OVLO threshold (23.9V typical), protecting downstream circuitry. A 1MΩ resistor must be placed between ACGATE and the FET source.

Is MP2651GVT-0000-Z compatible with lead-free reflow processes?

Yes. MP2651GVT-0000-Z is rated for lead-free reflow with a maximum lead temperature of 260°C and complies with RoHS Directive 2011/65/EU. Its TQFN-30 package uses matte tin plating and is qualified per JESD22-A113 moisture sensitivity level (MSL) 1, allowing unlimited floor life at ≤30°C/60% RH.