Monolithic Power Systems Inc. MP2623GR-Z

Overview

MP2623GR-Z from Monolithic Power Systems is a monolithic, step-down switching charger IC for 1- or 2-cell LiFePO4 battery packs, integrating a 0.2Ω high-side MOSFET, peak-current-mode control, dual-loop (voltage/current) regulation, and programmable 2A charge current. It delivers ±0.75% battery voltage accuracy, operates from 5V–24V input, and supports preconditioning for deeply depleted batteries in power tools and handheld terminals.

For engineers reviewing the MP2623GR-Z datasheet, MP2623GR-Z pinout, MP2623GR-Z application, or MP2623GR-Z equivalent, key selection criteria include its fixed 1.1MHz switching frequency, NTC-based thermal monitoring, integrated TMR timer with 30-min trickle/3-hour total timeout, and QFN16 (4×4mm) package with exposed thermal pad.

Technical Context

The MP2623GR-Z implements peak-current-mode control with a 1.1MHz oscillator and internal ramp compensation to ensure fast transient response and stable loop behavior across wide input (5–24V) and battery voltage (3.6V/7.2V) ranges. Its dual-loop architecture uses COMPI for constant-current regulation via RS1-sensed current and COMPV for constant-voltage regulation at ±0.75% accuracy.

It integrates safety-critical functions including cycle-by-cycle over-current protection, thermal shutdown at 150°C, battery temperature monitoring via NTC resistor divider, and open-drain status outputs (CHGOK, ACOK) with defined logic states for fault detection and system-level coordination.

Key Specifications

Pinout & Package

The MP2623GR-Z is housed in a thermally enhanced 4mm × 4mm QFN-16 package with exposed thermal pad on the underside, optimized for high-power battery charging in compact portable systems.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LiFePO4 battery charging applications.

Compared with MP2623GR-Z, MP2625GR-Z scales current output while preserving pin compatibility and safety features, whereas BQ24610RGER trades integration for configurability-making MP2623GR-Z optimal for cost-sensitive, space-constrained LiFePO4-only applications demanding plug-and-play reliability.

Availability

MP2623GR-Z is available at Aetrix Electronics and suitable for power tools, handheld terminals, and medical portable devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for MP2623GR-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 analog and mixed-signal ICs for power management, motion control, and automotive applications.

The MP2623 belongs to MPS's dedicated battery charger product line, engineered specifically for safe, efficient, and autonomous charging of LiFePO4 chemistries in portable industrial and medical equipment.

FAQ

What battery chemistries does the MP2623GR-Z support?

The MP2623GR-Z is designed exclusively for LiFePO4 (lithium iron phosphate) batteries in 1-cell (3.6V) or 2-cell (7.2V) configurations. Its fixed 3.6V/cell CV threshold, 2.52V/cell trickle entry, and absence of Li-ion-specific features like -ΔV termination confirm chemistry specificity. It does not support LiCoO₂, NMC, or lead-acid chemistries.

How is charge current programmed on the MP2623GR-Z?

Charge current is set by an external sense resistor RS1 between CSP and BATT pins, using the formula I_CHG = 200mV / RS1. For example, a 100mΩ resistor yields 2A nominal current. The device regulates current to ±5% accuracy over temperature and line variations, with no digital interface or register programming required.

What protections does the MP2623GR-Z provide against battery faults?

The MP2623GR-Z includes cycle-by-cycle over-current limiting, thermal shutdown at 150°C, NTC-based temperature window monitoring (configurable 0°C–50°C), timer-based charge timeout (30 min trickle / 3 hr total), and under-voltage lockout (3.3V rising threshold). All protections halt charging and assert CHGOK HIGH or ACOK HIGH to signal faults to the host system.

Can the MP2623GR-Z operate with a 5V USB input?

Yes - the MP2623GR-Z accepts 5V–24V input, making it compatible with standard 5V USB power sources. At 5V input, it maintains >85% efficiency for 1-cell charging and supports minimum 180mV VIN–VBATT headroom, enabling operation even with low-dropout adapters or long cables.

What is the function of the CELLS pin?

CELLS is a configuration pin that selects battery stack count: grounded for 1-cell (3.6V) operation or tied to VREF33 (or left floating) for 2-cell (7.2V) operation. This single-pin strapping eliminates external resistors or firmware configuration, enabling hardware-defined chemistry and voltage scaling without software overhead.

Does the MP2623GR-Z require external compensation components?

Yes - the MP2623GR-Z requires external RC networks on COMPV (voltage-loop) and COMPI (current-loop) pins to stabilize both control loops. Typical values are 10kΩ + 1nF for COMPI and 47kΩ + 220pF for COMPV, selected per application conditions to ensure phase margin >45° and prevent oscillation during CC/CV transitions.

How does the MP2623GR-Z indicate charging status?

It uses two open-drain status outputs: CHGOK (LOW = charging active, HIGH = complete/fault) and ACOK (LOW = valid input supply present). Both require external pull-up resistors (typically 10kΩ). Their combined logic states distinguish normal charge, end-of-charge, NTC fault, timer timeout, and input undervoltage per Table 1 in the datasheet.