Monolithic Power Systems Inc. MP2660GC-0000-Z

Overview

MP2660GC-0000-Z from Monolithic Power Systems is a 5V USB-input, I²C-programmable linear battery charger IC for single-cell Li-ion/Li-polymer batteries, featuring integrated power path management, ±0.5% battery voltage regulation accuracy, 455mA max input current limit, and 100mΩ battery FET for system supplement mode-used in compact wearable devices requiring autonomous charge control and seamless system power continuity.

For engineers reviewing the MP2660GC-0000-Z datasheet, MP2660GC-0000-Z pinout, MP2660GC-0000-Z application, or MP2660GC-0000-Z equivalent, key selection considerations include programmable input current/voltage regulation thresholds, thermal-regulated 120°C junction limit, battery UVLO programmability (2.4–3.1V), I²C-accessible safety timer (3–12 hrs), and WLCSP-9 package compatibility with space-constrained PCB layouts.

Technical Context

The MP2660 implements a dual-FET power path architecture: a 300mΩ LDO FET between IN and SYS enables regulated 4.85–5.15V system output even with dead battery, while a 100mΩ battery FET between BATT and SYS supports bidirectional discharge/charge control. Charge sequencing follows pre-charge → constant-current → constant-voltage phases with auto-recharge triggered at 130–370mV below VBATT_REG.

I²C interface (400kHz) configures all critical parameters-including input current limit (85–455mA), input minimum voltage regulation (3.88–5.08V), fast charge current (8–535mA), battery regulation voltage (3.600–4.545V), and NTC temperature window-enabling dynamic adaptation to USB source quality and battery health without external component changes.

Key Specifications

Pinout & Package

MP2660GC-0000-Z uses a 9-pin WLCSP package (1.55mm × 1.55mm) with 0.4mm pitch, optimized for ultra-thin portable designs. Thermal pad is not exposed; soldering requires controlled reflow profile per MPS WLCSP guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24210RGET and MAX1555ETA+, MP2660GC-0000-Z provides full I²C configurability of charge parameters, wider battery voltage range (3.6–4.545V), and hardware-enforced input voltage regulation-critical for robust operation across diverse USB sources and battery chemistries.

Availability

MP2660GC-0000-Z is available at Aetrix Electronics and suitable for wearable fitness trackers, smart Bluetooth headphones, ultra-thin smart watches, and wireless earbud cases requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2660GC-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 converters, battery chargers, and motor drivers for portable and industrial applications.

The MP2660 belongs to MPS's single-cell Li-ion linear charger product line, designed specifically for space-constrained, USB-powered wearables and audio devices demanding autonomous power path control, precision voltage regulation, and comprehensive safety features.

FAQ

What is the maximum continuous system load current supported by MP2660GC-0000-Z?

The MP2660GC-0000-Z supports up to 1.6A continuous system load current through the SYS pin. This is enabled by its integrated 300mΩ LDO FET (IN→SYS) and 100mΩ battery FET (BATT→SYS), which operate in parallel during supplement mode. The actual achievable load depends on thermal dissipation and input/battery voltage headroom, but the device maintains regulation down to 4.85V at 10mA and sustains >1.2A with <100mV droop under typical conditions.

How does the MP2660 handle battery charging when the system load exceeds input source capability?

When system load demand exceeds input current limit, the MP2660 enters supplement mode: it fully turns on the 100mΩ battery FET to supply additional current from the battery while simultaneously reducing charge current. This preserves system voltage stability (VSYS_REG = 4.85–5.15V) without interrupting operation-even with a deeply discharged battery-and avoids premature charge termination caused by shared current paths.

Can the MP2660GC-0000-Z be used with lithium iron phosphate (LiFePO₄) batteries?

No-the MP2660GC-0000-Z is specified exclusively for single-cell Li-ion and Li-polymer batteries with a regulation voltage range of 3.600–4.545V. LiFePO₄ cells require ~3.6V nominal and 3.65V termination, falling outside the device's minimum VBATT_REG setting of 3.600V and lacking the necessary low-voltage charge profile support. Using it with LiFePO₄ risks undercharging and reduced capacity utilization.

What is the purpose of the INT pin's 8-second hold function?

Holding the INT pin low for ≥8 seconds triggers hardware-level battery disconnection (FET_DIS), isolating the battery from the SYS rail. This places the device in shipping mode, reducing battery leakage current to ≤5µA-meeting UN38.3 transportation safety requirements. The function operates independently of I²C or host firmware, providing fail-safe logistics compliance without software intervention.

Does the MP2660GC-0000-Z require external MOSFETs for power path control?

No-MP2660GC-0000-Z integrates both the 300mΩ IN→SYS LDO FET and the 100mΩ BATT→SYS battery FET on-die. These eliminate the need for external blocking diodes or discrete MOSFETs, reducing BOM count, PCB area, and forward voltage losses. The internal FETs are rated for 1.6A system load and support full-featured charge/discharge control including current limiting and thermal regulation.

How is battery temperature monitored using the NTC pin?

The NTC pin accepts a voltage divider formed by a negative temperature coefficient thermistor and two resistors tied between IN and GND. The MP2660 measures the divider output and compares it against programmable hot (33–37% of VIN) and cold (64–68% of VIN) thresholds. If the sensed voltage falls outside this window, charging suspends immediately-preventing unsafe operation at extreme temperatures without requiring external ADC or microcontroller intervention.

What is the significance of the 114°C/W θJA value for the WLCSP-9 package?

The 114°C/W junction-to-ambient thermal resistance (θJA) quantifies how effectively heat transfers from the die to ambient air on a standard 4-layer JEDEC PCB. With a 120°C thermal regulation threshold and 0.88W max power dissipation, this θJA allows ~2.5°C/W margin before reaching thermal shutdown at 25°C ambient-confirming suitability for sealed enclosures in wearables where airflow is restricted and board space limits copper area.