Monolithic Power Systems Inc. MP2659GQ-0000-P

Overview

MP2659GQ-0000-P from Monolithic Power Systems is a standalone 36V switching battery charger IC with integrated high-side and low-side MOSFETs, designed for 3S–6S Li-ion/Li-polymer packs. It delivers up to 3A charge current, supports 3.6V/4.2V/4.35V/4.15V per-cell regulation voltages, achieves ±0.5% voltage accuracy, and operates with input hold-off up to 45V - enabling robust charging in power tools and portable medical devices.

For engineers reviewing the MP2659GQ-0000-P datasheet, MP2659GQ-0000-P pinout, MP2659GQ-0000-P application, or MP2659GQ-0000-P equivalent, key selection criteria include verified 3A charge capability, QFN-19 (3mm×3mm) thermal performance, cell-count configuration via CELL/VB pins, and integrated NTC-based thermal monitoring with cold/hot thresholds at 71% and 48.2% of VCC.

Technical Context

The MP2659 implements a synchronous buck topology with internal 40mΩ high-side (Q2) and 56mΩ low-side (Q3) MOSFETs, operating at selectable 350kHz or 680kHz switching frequencies. Its dual-loop control regulates both battery voltage (±0.5% accuracy) and charge current (set via ISET resistor), while independent input voltage (VDPM) and input current (ILIM) regulation loops protect upstream supplies.

Thermal management integrates a 150°C junction shutdown threshold with 20°C hysteresis, and battery safety includes programmable OVP (180mV/cell over-regulation), 50ms termination deglitch, and auto-recharge at 250mV/cell below regulation voltage - all coordinated by an on-chip state machine without external microcontroller dependency.

Key Specifications

Pinout & Package

MP2659GQ-0000-P is housed in a thermally enhanced QFN-19 (3mm×3mm) package with exposed thermal pad. Pin functions are validated per MPS MP2659 Rev. 1.2 datasheet (pp. 4–5), including dedicated inputs for cell count (CELL), regulation voltage (VB), NTC sensing (NTC), and regulation loop setting (VDPM, ILIM, ISET).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ25792RTWR and ISL9238HRZ-T, MP2659GQ-0000-P uniquely combines full integration (dual MOSFETs, internal current sensing), hardware-enforced safety (fixed OVP, 20h timer), and passive configuration (CELL/VB resistors) - making it optimal for cost-sensitive, MCU-less portable equipment where reliability trumps telemetry.

Availability

MP2659GQ-0000-P is available at Aetrix Electronics and suitable for industrial medical equipment, power tools, robotics, and wireless audio systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2659GQ-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-performance power management ICs, with design centers in the US, China, and Taiwan, and global distribution through authorized partners.

The MP2659 belongs to MPS's standalone battery charger product line, engineered specifically for portable industrial and consumer devices requiring robust, integrated, and configuration-flexible charging of 3S–6S Li-ion/Li-polymer packs without microcontroller supervision.

FAQ

What battery chemistries and configurations does MP2659GQ-0000-P support?

MP2659GQ-0000-P supports Li-ion and Li-polymer batteries in 3-series to 6-series configurations. Cell count is set via the CELL pin (AGND=3S, float=4S, VCC=5S, 100kΩ-to-AGND=6S), and per-cell regulation voltage is selected via the VB pin (AGND=3.6V, float=4.2V, VCC=4.35V, 100kΩ-to-AGND=4.15V). It does not support LiFePO₄ or NiMH chemistries.

How is charge current programmed, and what is the accuracy?

Charge current is set by a resistor (RISET) from ISET to AGND, using the formula ICC = 96kΩ / RISET(kΩ). For example, 48kΩ yields 2A. Accuracy is ±10% over temperature and line, verified per Electrical Characteristics table (p.7), with typical variation <±5% at 25°C. No external sense resistor is needed.

Does MP2659GQ-0000-P include thermal protection, and how is it implemented?

Yes - it features junction thermal shutdown at 150°C (rising) with 20°C hysteresis, plus battery temperature monitoring via the NTC pin. The NTC circuit compares thermistor voltage against cold (71% VCC) and hot (48.2% VCC) thresholds; charging halts if the voltage falls outside this window and resumes only upon return to range.

Can MP2659GQ-0000-P charge a completely depleted (0V) battery pack?

No - it requires ≥1.5V per cell to initiate pre-charge. However, it supports dead-battery recovery for packs down to ~1.5V/cell (e.g., 4.5V for 3S) by limiting input current to 60mA in 20ms bursts, allowing gradual voltage rise and reset of pack protection ICs before entering standard pre-charge at 200mA.

What is the role of the VDPM pin, and how is it configured?

VDPM is the input voltage regulation feedback pin. A resistor divider from IN to AGND sets the minimum input voltage (VIN_MIN); when VDPM drops to 1.2V, the IC reduces charge current to maintain that input voltage. Pulling VDPM below 0.2V disables charging entirely - enabling simple enable/disable control without additional logic.

Is there a recommended inductor value, and why?

MPS recommends a 10μH inductor with ≥5A saturation current (e.g., 10μH/35mΩ). This balances ripple current (designed for ~30–40% of CC current), core loss, and physical size. Equation (4) in the datasheet confirms 10μH is optimal for 24V input/16.8V battery at 2A, ensuring stable operation across 350–680kHz switching frequencies.

How does the STAT pin indicate fault conditions?

STAT is an open-drain output: low = active charging; Hi-Z = charge complete or disabled; blinking at 2Hz = fault (OVP, NTC out-of-range, or safety timer expiry); blinking at 1Hz = input regulation mode. No external pull-up is required for basic status, but a 10kΩ pull-up to 3.3V/5V is typical for LED or MCU interfacing.