Monolithic Power Systems Inc. MP2664GG-0000-Z

Overview

MP2664GG-0000-Z from Monolithic Power Systems is a fully integrated, I²C-controlled single-cell Li-ion/Li-polymer battery charger with independent power path management in a QFN-10 (2mm×2mm) package. It delivers up to 455mA charge current, supports USB 5V input, provides ±0.5% battery voltage regulation accuracy at 4.2V, and integrates dual FETs (300mΩ IN→SYS LDO, 100mΩ BATT→SYS switch) for simultaneous system powering and battery charging-used in compact wearable devices requiring autonomous charge control and thermal-safe operation.

For engineers reviewing the MP2664GG-0000-Z datasheet, MP2664GG-0000-Z pinout, MP2664GG-0000-Z application, or MP2664GG-0000-Z equivalent, this page details its I²C-programmable charge parameters (input current limit, battery UVLO, safety timer), power path behavior under load conflict, thermal regulation at 120°C, and real-world use in space-constrained portable systems where battery disconnection and NTC-based temperature monitoring are critical.

Technical Context

The MP2664 implements a direct power path architecture with two independently controlled MOSFETs: a 300mΩ LDO FET between IN and SYS for regulated system supply, and a 100mΩ battery FET between BATT and SYS for bidirectional energy flow. Its I²C interface configures all key charge parameters-including pre-charge current (6–27mA), fast-charge current (8–535mA), battery regulation voltage (3.6–4.545V), and auto-recharge threshold (120–365mV)-with register-level access to status flags and fault conditions.

Operation includes three-phase charging (pre-charge → CC → CV), programmable termination current (5–64mA), thermal regulation at 120°C (not shutdown), and robust protection: input OVP (6.0V), input UVLO (3.9V), battery OVP (VBATT_REG +130mV), and battery UVLO (2.4–3.1V). The INT pin serves dual roles-interrupt reporting and forced battery disconnect after 16s low pulse-enabling host-controlled safe battery isolation.

Key Specifications

Pinout & Package

MP2664GG-0000-Z is housed in a thermally enhanced QFN-10 package (2mm × 2mm, 0.5mm pitch) with exposed thermal pad. Pin numbering follows top-view orientation per MPS package drawing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24296RGER and MAX77860EWJ+T, MP2664GG-0000-Z uniquely balances minimal footprint (QFN-10), autonomous power path decision-making, and host-controllable battery isolation-making it optimal for resource-constrained wearables where size, safety autonomy, and USB-native operation are non-negotiable.

Availability

MP2664GG-0000-Z is available at Aetrix Electronics and suitable for smart wearables, fitness trackers, and Bluetooth headsets requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2664GG-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 20 years of expertise in DC-DC conversion, battery charging, and motor control solutions.

The MP2664 belongs to MPS's single-cell Li-ion charger product line, designed specifically for space-constrained portable electronics that demand autonomous, thermally robust, and I²C-configurable battery management without external discrete components.

FAQ

What is the maximum continuous input current the MP2664GG-0000-Z can deliver to the system load?

The MP2664GG-0000-Z supports up to 3.2A continuous current from the battery to the system (BATT→SYS path) and up to 455mA from input to system (IN→SYS path) when configured for maximum input current limit. System current capability depends on both input source strength and battery state-during high load, the IC automatically supplements input power with battery current while maintaining VSYS at 4.65V.

How does the MP2664 handle battery over-voltage protection?

The MP2664 implements battery over-voltage protection (BATT_OVP) at VBATT_REG +130mV (e.g., 4.35V when VBATT_REG = 4.22V), with 70mV hysteresis. This hardware-level protection immediately disables charging current when the battery voltage exceeds the threshold, preventing lithium plating and cell swelling. Unlike software-only safeguards, this is an analog comparator-based feature independent of I²C communication or register settings.

Can the MP2664GG-0000-Z operate without an I²C host controller?

Yes-the MP2664GG-0000-Z operates autonomously with factory-default register values: 455mA input current limit, 4.2V battery regulation, 2.8V battery UVLO, and enabled thermal regulation. I²C is optional for customization; basic charging and power path functions work immediately upon power-up with no host interaction required.

What is the purpose of the INT pin beyond interrupt signaling?

Beyond generating charge-status interrupts, the INT pin provides hardware-level battery isolation: holding INT low for >16 seconds forces the internal BATT→SYS FET off, disconnecting the battery from the system. After >4 seconds, the FET automatically re-enables-this feature enables safe battery removal, field firmware updates, or emergency power-down without MCU involvement.

Does the MP2664GG-0000-Z support USB BC1.2 or proprietary fast-charge protocols?

No-the MP2664GG-0000-Z accepts only fixed 5V USB input and does not negotiate voltage or current with upstream sources via D+/D− lines. It relies on external circuitry (e.g., USB PD controller or BC1.2 detector) to set VIN; the IC itself regulates based solely on its internal I²C-configured input current limit and minimum input voltage threshold.

How is thermal performance affected by the QFN-10 package's exposed pad?

The QFN-10's exposed thermal pad must be soldered to a minimum 40mm² copper pour on the PCB for effective heat dissipation. With proper layout, θJA drops from 80°C/W (4-layer board, no thermal pad) to ~45°C/W-enabling sustained 455mA charging at ambient temperatures up to 60°C without entering thermal regulation, critical for sealed wearable enclosures.

What happens during input power removal while the system is active?

Upon input removal, the MP2664 instantly switches system supply from IN→SYS to BATT→SYS using the 100mΩ battery FET, maintaining VSYS at 4.65V without interruption. If battery voltage falls below the programmed UVLO threshold (e.g., 2.8V), the BATT→SYS path opens, preventing further discharge and protecting cell integrity-ensuring graceful system shutdown rather than brownout.