Monolithic Power Systems Inc. MP2604DQ-LF-P

Overview

MP2604DQ-LF-P from Monolithic Power Systems is a single-cell linear Li-ion battery charger IC with integrated 28V input surge protection, programmable 85mA–1A constant-current charging, ±0.75% battery voltage regulation at 4.2V, and thermal/NTC-based battery temperature monitoring. It operates in CC/CV mode, provides ACOK and CHG status indicators, and targets portable consumer electronics requiring compact, reliable charging.

For engineers reviewing the MP2604DQ-LF-P datasheet, MP2604DQ-LF-P pinout, MP2604DQ-LF-P application, or MP2604DQ-LF-P equivalent, key selection criteria include its 3mm × 3mm QFN10 package, absence of trickle charge, reverse current blocking (<1µA), soft-start programmability, and battery full threshold programmability via IBF resistor.

Technical Context

The MP2604DQ-LF-P implements a dual-loop CC/CV charging architecture with independent ISET (charge current) and IBF (termination threshold) programming pins, enabling precise control over both bulk and taper phases. Its proprietary over-voltage protection triggers at 7.0V input with 400mV hysteresis and disables charging when VIN < 2.5V or > 7.0V.

Thermal management uses a soft thermal shutdown mechanism activating at 105–135°C with 10°C hysteresis, producing a saw-tooth current waveform to reduce average power dissipation. The NTC interface supports 0°C–50°C charging windows using a 100kΩ thermistor and 500kΩ pull-up to IN.

Key Specifications

Pinout & Package

MP2604DQ-LF-P is housed in a 10-pin 3mm × 3mm QFN package with exposed thermal pad. Pin 1 is marked by a dot or notch; the exposed pad must be soldered to PCB ground for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24075RGTR and TP4056, MP2604DQ-LF-P uniquely integrates 28V surge tolerance, dual open-drain status pins, and factory-trimmed 0.75% VBATT accuracy-making it optimal for adapter-fed portable devices requiring robustness and precision without external protection components.

Availability

MP2604DQ-LF-P is available at Aetrix Electronics and suitable for cell phones, smartphones, MP3/multimedia players, and digital cameras requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP2604DQ-LF-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 analog and mixed-signal ICs for power management, motor drive, and automotive applications.

The MP2604 belongs to MPS's battery management product line, designed specifically for compact, high-reliability linear charging in portable consumer electronics with stringent safety and thermal constraints.

FAQ

What is the maximum input voltage the MP2604DQ-LF-P can safely withstand?

The MP2604DQ-LF-P features integrated input surge protection rated up to +28V. While normal operation occurs between 3.5V and 6.5V, the IC remains undamaged under transient surges up to 28V, eliminating the need for external TVS diodes in many adapter-fed designs.

How is the charge termination current (IBF) programmed?

IBF is set by connecting a resistor R_BF from the IBF pin to GND, where I_BF = 1.7A / R_BF(kΩ). Valid R_BF values range from 2×R_CHG to 10×R_CHG, enabling termination thresholds from 10% to 50% of the programmed I_CHG.

Does the MP2604DQ-LF-P support trickle charging?

No. The MP2604DQ-LF-P explicitly omits trickle charge functionality. It enters CC mode directly upon detecting a depleted battery and transitions to CV mode at 4.2V, terminating when current falls to the programmed IBF threshold.

What is the purpose of the SS pin, and how is it configured?

The SS pin controls soft-start duration via an external capacitor (e.g., 0.1µF), setting a controlled current ramp time of 10–35ms. This limits inrush current into the output capacitor and prevents input voltage droop during startup.

Can the MP2604DQ-LF-P operate without a battery connected?

Yes. The MP2604DQ-LF-P is stable and functional with no battery attached to the BATT pin. It will not attempt charging and maintains proper regulation and status signaling, enabling pre-assembly testing and system-level validation.

How does the NTC interface determine valid charging temperature?

The NTC pin compares the thermistor resistance against internal thresholds. With a 100kΩ NTC and 500kΩ pull-up to IN, charging halts if R_NTC < 32.3kΩ or > 376.6kΩ - corresponding to ~0°C and ~50°C for the TH11-4H104F thermistor used in the reference design.

What happens during thermal shutdown, and how is recovery handled?

At junction temperatures of 105–135°C, the MP2604DQ-LF-P enters soft thermal shutdown, modulating charge current into a saw-tooth waveform to reduce average power. Recovery occurs automatically once temperature falls below the hysteresis threshold (typically 10°C lower), resuming normal CC/CV operation.