Monolithic Power Systems Inc. MP2602DQ-LF-P

Overview

MP2602DQ-LF-P from Monolithic Power Systems is a linear single-cell Li-ion battery charger IC with integrated 28V input surge tolerance, programmable 85mA–1A constant-current charging, 4.20V ±0.042V battery voltage regulation, and trickle-charge preconditioning for deeply discharged cells. It operates in CC/CV mode with thermal shutdown, NTC-based temperature monitoring, and reverse current blocking (<1µA), targeting portable consumer electronics requiring compact, robust charging control.

For engineers reviewing the MP2602DQ-LF-P datasheet, MP2602DQ-LF-P pinout, MP2602DQ-LF-P application, or MP2602DQ-LF-P equivalent, this page delivers verified functional specifications, validated QFN10 package mapping, confirmed charge termination logic (IBF threshold), real-world thermal protection behavior, and direct alternatives with documented IBF/ICHG programming differences.

Technical Context

The MP2602DQ-LF-P implements a fully integrated linear charging architecture with dual-stage regulation: constant-current (CC) mode governed by external R_CHG on ISET pin (1.65kΩ–15kΩ), and constant-voltage (CV) mode with 0.75% VBATT accuracy and auto-recharge triggered at 50mV below 4.20V. Its proprietary overvoltage protection activates at VIN >6.2V with 400mV hysteresis.

Thermal management uses a soft thermal shutdown mechanism that converts DC charge current into a saw-tooth waveform above 105°C, with 10°C hysteresis and SS-pin capacitor-tunable frequency. Battery full detection relies on programmable IBF threshold (10–50% of ICHG) via resistor on IBF pin, while NTC monitoring compares R_NTC against 32.3kΩ–376.6kΩ window to enforce 0°C–50°C charging range.

Key Specifications

Pinout & Package

MP2602DQ-LF-P is housed in a 10-pin 3mm × 3mm QFN package with exposed thermal pad (JEDEC MO-229 VEED-5 compliant). The package supports high thermal conductivity and compact PCB layout for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24075RGTR and TP4056, MP2602DQ-LF-P uniquely combines 28V surge immunity, programmable IBF/ICHG, integrated trickle-charge, and NTC-comparator functionality in a single 3mm×3mm QFN - enabling safer, more autonomous charging in compact consumer devices without external protection components.

Availability

MP2602DQ-LF-P is available at Aetrix Electronics and suitable for smartphones, digital cameras, MP3 players, and PDAs requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.

Supply support for MP2602DQ-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, motion control, and automotive applications.

The MP2602 belongs to MPS's linear battery charger product line, designed specifically for space-constrained portable electronics needing robust, integrated, and thermally aware single-cell Li-ion charging solutions.

FAQ

What input voltage surge level does MP2602DQ-LF-P withstand?

The MP2602DQ-LF-P tolerates input surges up to +28V without damage or latch-up, thanks to integrated high-voltage input protection circuitry. This allows direct connection to unregulated wall adapters or automotive USB ports without external TVS diodes. Operation remains normal within 3.5V–5.5V, and the ACOK pin indicates valid input only between 2.5V and 6.0V.

How is 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, yielding a programmable termination threshold of 10–50% of the programmed ICHG. For example, with R_CHG = 3.3kΩ (500mA ICHG), R_BF = 17kΩ yields IBF = 100mA (20% of ICHG).

Does MP2602DQ-LF-P support battery temperature monitoring?

Yes - it includes an integrated NTC thermistor window comparator. With a standard 100kΩ NTC (e.g., TH11-4H104F) and 500kΩ pull-up to IN, the device monitors R_NTC and suspends charging if resistance falls below 32.3kΩ or exceeds 376.6kΩ - corresponding to a validated 0°C–50°C operating range. Pin 5 (NTC) must never be left floating.

What happens during thermal overload?

At junction temperatures exceeding 105°C–135°C, the MP2602DQ-LF-P enters soft thermal shutdown: charge current transitions from DC to a saw-tooth waveform with reduced average amplitude. This lowers power dissipation while maintaining partial charging capability. The SS pin capacitor value adjusts waveform frequency, and cooling measures (lower VIN, improved heatsinking) restore full-rate charging.

Can MP2602DQ-LF-P operate with USB-only input?

Yes - its 3.5V–5.5V input range and built-in ACOK indicator make it ideal for USB-powered devices. The ACOK pin asserts low when VIN is within 2.5V–6.0V, confirming valid USB VBUS presence. Input surge tolerance up to 28V also accommodates legacy chargers or noisy USB hubs without external protection.

Is reverse battery current blocked when the IC is disabled?

Yes - with EN held high (or pulled to VIN), the internal pass FET is fully off, limiting reverse current from BATT to IN to less than 1µA. This prevents battery discharge during system standby or when the adapter is disconnected, preserving runtime in always-on portable applications.

What is the accuracy of battery voltage regulation?

Battery voltage regulation is specified at 4.20V ±0.042V (±0.75%) across –5°C to +75°C ambient, measured at zero load. This tight tolerance ensures compliance with Li-ion cell specifications and prevents overcharging even under thermal drift, supporting long-term cycle life and safety certification.