Monolithic Power Systems Inc. MP2665AGQB-0000-Z

Overview

MP2665AGQB-0000-Z 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 powering and battery charging in space-constrained portable devices, supports USB-compliant input (4.35–5.5V), provides ±0.5% battery voltage regulation accuracy at 4.2V, and achieves ultra-low 350nA battery leakage in shipping mode.

For engineers reviewing the MP2665AGQB-0000-Z datasheet, MP2665AGQB-0000-Z pinout, MP2665AGQB-0000-Z application, or MP2665AGQB-0000-Z equivalent, key selection considerations include I²C-configurable input current limit (50mA–1A), programmable battery UVLO (2.2–3.2V), dual-FET power path architecture (290mΩ IN→SYS LDO + 100mΩ BATT→SYS switch), thermal regulation threshold (120°C), and shipping-mode entry/exit timing (1s/2s deglitch).

Technical Context

The MP2665A implements a dual-FET pass-through power path: an internal 290mΩ LDO FET regulates SYS from IN, while a 100mΩ battery FET controls energy flow between BATT and SYS. This decouples charging current from system load, enabling true charge termination and full-battery maintenance during system operation.

Its I²C interface (400kHz) configures all critical parameters-including input current limit, battery regulation voltage (3.6–4.53V), fast charge current (16–896mA), pre-charge/termination current (2.5–62mA), and thermal regulation thresholds-and reports status via the open-drain INT pin, which also serves as a hardware reset and battery disconnect control.

Key Specifications

Pinout & Package

MP2665AGQB-0000-Z 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 and efficient heat dissipation in compact wearable and handheld PCBs.

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 ISL9238HRZ-T, MP2665AGQB-0000-Z uniquely integrates 21V OVP, I²C-configurable thermal thresholds, and sub-1µA shipping mode-making it the only option for ruggedized, globally distributed, or medical-grade portable devices requiring autonomous safety and long-term logistics readiness.

Availability

MP2665AGQB-0000-Z 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, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP2665AGQB-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-efficiency DC-DC converters, battery management ICs, and motor drivers for portable, automotive, and industrial applications.

The MP2665A belongs to MPS's highly integrated battery charger product line, designed specifically for space-constrained, USB-powered portable electronics requiring intelligent power path arbitration, I²C configurability, and robust safety features.

FAQ

What is the maximum allowable input voltage for MP2665AGQB-0000-Z, and how does OVP behave?

The absolute maximum input voltage is +21V, with over-voltage protection (OVP) triggering at 6.1–6.7V (typ. 6.4V). When VIN exceeds this threshold, the IN→SYS LDO FET turns off immediately, blocking power to SYS and preventing damage. Recovery requires VIN to fall below the hysteresis level (350mV) before the 200µs immunity timer re-enables the FET.

How does the MP2665A handle system load priority during limited input power?

When input current is constrained (e.g., by IIN_LIM setting or weak adapter), the MP2665A automatically reduces charge current to maintain the regulated VSYS voltage. If the system load exceeds available input power, the battery FET supplements the deficit-ensuring uninterrupted SYS operation even during fast charging under marginal input conditions.

Can the battery UVLO threshold be adjusted, and what are the valid settings?

Yes-the battery under-voltage lockout (VBATT_UVLO) threshold is fully configurable via I²C register REG01h bits[2:0], offering three discrete settings: 2.2–2.6V (bits 000), 2.6–2.92V (bits 100), or 2.9–3.2V (bits 111). This allows tailoring to specific cell chemistry, aging profile, or safety margin requirements without hardware changes.

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

INT serves three functions: (1) open-drain status/fault reporting to host MCU, (2) hardware reset trigger (pull low >16s to force battery FET off/on), and (3) system disconnect control-allowing the host to isolate the battery from SYS during diagnostics or fault recovery without disabling the entire power path.

Does MP2665AGQB-0000-Z support charging from a 9V or 12V wall adapter?

No-it is rated for USB-compliant inputs (4.35–5.5V) only. While its absolute maximum input rating is 21V, sustained operation above 5.5V violates recommended operating conditions and risks violating the input voltage regulation loop (VIN_MIN range: 3.88–5.08V), potentially causing unstable power path behavior or premature OVP activation.

How is thermal regulation implemented, and can it be disabled?

Thermal regulation activates at a configurable junction temperature (default 120°C, adjustable via REG07h bits[5:4]) and reduces charge current to hold TJ near threshold. It cannot be disabled-this is a hardwired safety feature. Hysteresis (20°C) prevents oscillation, and thermal shutdown (150°C) provides final protection.

What external components are mandatory for basic operation?

Mandatory components include: 4.7μF ceramic capacitor on IN, 22μF on BATT, 10μF on SYS, 100nF on VDD, 10kΩ pull-ups on SDA/SCL, and an NTC thermistor on NTC. Optional but recommended: RC filter on NTC for noise immunity and 100nF bypass on INT for glitch suppression.