Monolithic Power Systems Inc. MP2665AGQB-0000-P

Overview

MP2665AGQB-0000-P from Monolithic Power Systems is a 21V-input, 1A I²C-configurable single-cell Li-ion/Li-polymer battery charger with integrated power path management, shipping mode, and NTC-based thermal monitoring. It delivers simultaneous system power and battery charging in space-constrained wearables and smart handhelds, featuring ±0.5% battery voltage regulation accuracy, 100mΩ battery FET, and 290mΩ input LDO FET.

For engineers reviewing the MP2665AGQB-0000-P datasheet, MP2665AGQB-0000-P pinout, MP2665AGQB-0000-P application, or MP2665AGQB-0000-P equivalent, key selection considerations include I²C-programmable input current limit (50mA–1A), configurable battery UVLO (2.2V–3.2V), shipping-mode leakage <350nA, and dual-FET power path architecture enabling true system-first operation with deep-battery startup.

Technical Context

The MP2665A implements a dual-FET power path architecture: a 290mΩ LDO FET between IN and SYS regulates system voltage (configurable 4.2V–4.95V), while a 100mΩ battery FET between BATT and SYS enables independent control of charge and discharge paths. This decouples system load demand from battery charging, allowing full-system operation even with deeply discharged batteries.

Charging control is fully I²C-driven with register-mapped parameters including fast-charge current (16mA–896mA), termination threshold (2.5mA–62mA), safety timer, and NTC cold/hot thresholds (63–68% / 31–35% of VDD). Thermal regulation activates at 120°C, and robust protections include input OVP (6.1–6.7V), battery OVP (110mV above VBATT_REG), and PCB over-temperature shutdown.

Key Specifications

Pinout & Package

MP2665AGQB-0000-P is housed in a thermally enhanced QFN-12 package (2.5mm × 3mm, 0.5mm pitch) with exposed thermal pad. The package supports high-density layout in compact portable designs and provides low-thermal-resistance path (θ_JA = 60°C/W) for sustained 1A operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ25618RTWR and MAX77751EWJ+, MP2665AGQB-0000-P uniquely balances wide-input ruggedness (21V OVP), sub-µA shipping mode, and compact QFN-12 footprint-making it optimal for size- and shelf-life-constrained wearables where input source variability is high.

Availability

MP2665AGQB-0000-P is available at Aetrix Electronics and suitable for wearable fitness trackers, smart Bluetooth headsets, medical patch monitors, and industrial handheld scanners requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for MP2665AGQB-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-efficiency power management ICs for consumer, industrial, and automotive markets, with emphasis on miniaturization and thermal performance.

The MP2665A belongs to MPS's battery management product line, designed specifically for space-constrained portable electronics requiring intelligent power path control, ultra-low quiescent current, and I²C configurability without external components.

FAQ

What is the maximum allowable input voltage for MP2665AGQB-0000-P, and how does over-voltage protection operate?

The MP2665AGQB-0000-P supports up to 21V absolute maximum input voltage with built-in over-voltage protection (OVP) triggering at 6.1–6.7V. When VIN exceeds this threshold, the internal LDO FET (Q1) turns off immediately to isolate the system and battery, preventing damage. Recovery occurs only after VIN falls below the hysteresis level (350mV), ensuring stable re-engagement without oscillation.

How does the power path management function during simultaneous charging and system operation?

MP2665AGQB-0000-P uses two independent FETs: a 290mΩ LDO FET (IN→SYS) and a 100mΩ battery FET (BATT→SYS). During concurrent operation, system load demand takes priority. If input power is insufficient, the device reduces charge current and supplements load from the battery-ensuring uninterrupted system operation while preserving battery health and enabling accurate charge termination.

Can the battery under-voltage lockout (UVLO) threshold be adjusted, and what are the valid settings?

Yes, the battery UVLO threshold is fully configurable via I²C register REG01h bits[2:0], offering three discrete settings: 2.2–2.6V (000), 2.6–2.92V (100), and 2.9–3.2V (111). This allows tailoring protection to specific Li-ion chemistry (e.g., LCO vs. NMC) and application safety margins without hardware changes.

What is the purpose of the INT pin, and how is it used for system reset functionality?

The INT pin serves dual roles: open-drain interrupt signaling (e.g., charge complete, fault) and hardware reset trigger. Holding INT low for ≥16s (configurable via REG01h) forces the battery FET to turn off for 4s (tRST_DUR), then automatically restores connection-enabling safe battery isolation and recovery without host MCU intervention or power cycle.

Does MP2665AGQB-0000-P support charging from weak USB adapters, and how is this implemented?

Yes, it implements a programmable input voltage regulation loop (VIN_MIN) ranging from 3.88V to 5.08V via REG00h bits[7:4]. When input voltage drops near this threshold, the device reduces input current limit to prevent collapse, maintaining stable SYS voltage and enabling reliable charging even from low-quality or long-cable USB sources.

How is thermal regulation managed, and what happens when junction temperature exceeds limits?

Thermal regulation activates at 120°C (configurable via REG07h bits[5:4]) by linearly reducing charge current to hold die temperature constant. If temperature reaches 150°C, thermal shutdown engages, disabling both FETs until cooldown. Hysteresis is 20°C, ensuring stable re-start without cycling.

What distinguishes the shipping mode from standard suspend mode, and how is it activated?

Shipping mode reduces battery leakage to ≤350nA-over 10× lower than suspend mode (0.7–1.5mA)-by disabling internal bias circuits and isolating the battery FET. It is activated via I²C register REG06h bit[5] and exited automatically on VIN plug-in or manually via INT pin assertion, making it ideal for long-term logistics and shelf storage.