Monolithic Power Systems Inc. MP2659GQ-0000-Z

Overview

MP2659GQ-0000-Z from Monolithic Power Systems is a standalone 36V synchronous buck switching charger IC for 3–6-cell Li-ion/Li-polymer battery packs, delivering up to 3A charge current with ±0.5% battery voltage regulation accuracy, integrated MOSFETs (40mΩ HS/LS), and input voltage clamp up to 45V. It enables dead-battery recovery and supports configurable cell count (3S–6S) and regulation voltages (3.6V–4.35V/cell) in industrial power tools and portable medical equipment.

For engineers reviewing the MP2659GQ-0000-Z datasheet, MP2659GQ-0000-Z pinout, MP2659GQ-0000-Z application, or MP2659GQ-0000-Z equivalent, key selection criteria include input voltage hold-off (45V), integrated NTC thermal monitoring with programmable hot/cold thresholds, charge safety timer (20 hrs), and dual-loop input current/voltage regulation to protect upstream power supplies.

Technical Context

The MP2659 implements a synchronous buck topology with three integrated MOSFETs (Q1 reverse-blocking FET, Q2 high-side, Q3 low-side) and internal loop compensation-eliminating external compensation components. Its multi-phase charging logic (pre-charge → constant-current → constant-voltage) is governed by real-time battery voltage thresholds (e.g., 2.9–3.1V/cell pre-charge exit) and dynamically adjusted via CELL/VB pin configurations.

Input protection is enforced through dual independent regulation loops: VDPM-based input voltage regulation (1.2V reference) and ILIM-based input current limiting (resistor-programmable), both capable of throttling charge current before triggering fault shutdown. Thermal management integrates a 150°C junction shutdown threshold with 20°C hysteresis and NTC-based battery temperature window control (71% cold / 48% hot of VCC).

Key Specifications

Pinout & Package

MP2659GQ-0000-Z is housed in a thermally enhanced QFN-19 (3mm × 3mm, 0.5mm pitch) package with exposed thermal pad, supporting >2.5W continuous dissipation at 25°C ambient when properly soldered to PCB copper.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar standalone switching charger applications.

Compared with BQ25792RTWR and LTC4162EUFD-4, MP2659GQ-0000-Z uniquely combines 3S–6S configurability, integrated reverse-blocking FET, and dead-battery recovery in a 3mm×3mm package-making it optimal for portable industrial tools and robotics where pack versatility and field reliability are critical.

Availability

MP2659GQ-0000-Z is available at Aetrix Electronics and suitable for industrial power tools, portable medical devices, autonomous mobile robots, and high-end wireless speakers requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for MP2659GQ-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 charging, and motor control solutions.

The MP2659 belongs to MPS's standalone battery charger product line, engineered specifically for portable industrial and medical equipment requiring high integration, wide input voltage tolerance, and robust safety features without microcontroller dependency.

FAQ

What battery chemistries does MP2659GQ-0000-Z support?

MP2659GQ-0000-Z supports Li-ion and Li-polymer batteries exclusively. Its four configurable per-cell regulation voltages-3.6V, 4.2V, 4.35V, and 4.15V-are matched to standard NMC, LCO, and high-voltage LiCoO₂ variants. It does not support LiFePO₄, NiMH, or lead-acid chemistries due to fixed voltage thresholds and absence of dedicated charge algorithms for those chemistries.

How is dead battery recovery activated?

Dead battery recovery activates automatically when the battery voltage falls below 1.5V per cell. The IC enters a 60mA current-limited mode for 20ms, followed by a 1.4s suspension period, repeating until the battery voltage rises above the short-circuit threshold (e.g., 1.4–1.6V/cell for 4S). No external enable signal or configuration is required-this behavior is hardwired into the analog control logic.

Can MP2659GQ-0000-Z operate without an NTC thermistor?

Yes-NTC functionality is optional. If the NTC pin is left floating or pulled to AGND/VCC, the IC disables thermal monitoring and proceeds with charging. However, disabling NTC voids JEITA compliance and removes critical overtemperature protection; MPS strongly recommends connecting a valid NTC network for all production designs per datasheet Section 9.3.

What is the purpose of the PMID_S pin?

The PMID_S pin provides direct feedback of the PMID node voltage to the internal current-sense amplifier, enabling accurate high-side current measurement without external shunt resistors. It must be shorted to the PMID pin with minimal trace length-adding capacitance or resistance here degrades current regulation accuracy and may cause instability in the power stage.

How does input voltage regulation (VDPM) interact with input current limiting (ILIM)?

VDPM and ILIM operate independently but concurrently: VDPM regulates input voltage by reducing charge current when VIN approaches the programmed minimum (e.g., 12V), while ILIM caps total input current (e.g., 1.5A) regardless of VIN level. Both loops throttle charge current before triggering fault shutdown-ensuring upstream adapters remain within safe operating area under combined load and line-sag conditions.

Is MP2659GQ-0000-Z pin-compatible with earlier MP2658 variants?

No-MP2659GQ-0000-Z is not pin-compatible with MP2658. While both are QFN-19 packages, pin functions differ significantly: MP2659 relocates ACOK to Pin 13 (vs. Pin 8 on MP2658), moves STAT to Pin 8 (vs. Pin 10), and adds PMID_S (Pin 19) absent in MP2658. PCB layout and schematic must be redesigned for migration.

What thermal derating applies above 25°C ambient?

With θ_JA = 50°C/W, the maximum allowable power dissipation decreases linearly: at 75°C ambient, PD_MAX = (150°C − 75°C) / 50°C/W = 1.5W. Since typical power loss at 3A/24V input is ~1.2W, full 3A operation remains viable up to ~85°C ambient with adequate copper pour-verified in MPS Application Note AN-157.