Monolithic Power Systems Inc. MP2602DQ-LF-Z

Overview

MP2602DQ-LF-Z 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 delivers charge status (CHG) and AC adapter power-good (ACOK) signals to host systems in portable electronics.

For engineers reviewing the MP2602DQ-LF-Z datasheet, MP2602DQ-LF-Z pinout, MP2602DQ-LF-Z application, or MP2602DQ-LF-Z equivalent, key selection criteria include its 3mm × 3mm QFN10 package, thermal shutdown at 105–135°C, <1µA reverse battery current, 90µA VIN standby current, and NTC-based temperature monitoring for safe charging in consumer handheld devices.

Technical Context

The MP2602DQ-LF-Z implements a three-stage linear charging algorithm-trickle (10% ICHG below 2.6V), constant-current (CC), and constant-voltage (CV)-with auto-recharge triggered when VBATT drops 50mV below 4.20V. Its proprietary over-voltage protection clamps charge current to 0µA if VBATT exceeds 4.25V.

Input surge resilience up to 28V is achieved via internal high-voltage front-end circuitry, while soft-start timing (10–35ms) is set by an external capacitor on the SS pin. Charge termination is determined by IBF threshold (programmable 10–50% of ICHG), not timer-based, enabling precise full-charge detection under varying load conditions.

Key Specifications

Pinout & Package

MP2602DQ-LF-Z is housed in a thermally enhanced 10-pin 3mm × 3mm QFN package with exposed thermal pad on the underside. The package supports JEDEC MO-229 VEED-5 standard and provides θJA = 50°C/W on 1"² 1 oz copper PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65023BRSBT and BQ24075RGTR, MP2602DQ-LF-Z offers superior VBATT accuracy (0.75% vs. ≥0.5%), native 28V surge resilience, and independent programming of both ICHG and IBF-enabling tighter control over charge termination and thermal behavior in compact portable designs.

Availability

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

Supply support for MP2602DQ-LF-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, motor drive, and automotive applications.

The MP2602 belongs to MPS's battery management product line, engineered specifically for space-constrained, single-cell Li-ion charging in consumer portables where reliability, thermal safety, and input surge robustness are critical.

FAQ

What is the maximum input voltage the MP2602DQ-LF-Z can safely withstand?

The MP2602DQ-LF-Z integrates front-end protection that tolerates input voltage surges up to +28V without damage or functional disruption. Its normal operating range is 3.5V to 5.5V, and it automatically disables charging if VIN rises above 6.0V or falls below 2.5V, as confirmed in the Absolute Maximum Ratings and Operation sections of Rev. 1.3 datasheet.

How is charge termination determined on the MP2602DQ-LF-Z?

Charge termination is triggered when the battery current in constant-voltage (CV) mode drops to the programmed IBF threshold-set by a resistor from IBF pin to GND. IBF is adjustable from 10% to 50% of the programmed ICHG value, enabling precise full-charge detection independent of battery aging or temperature drift.

Does the MP2602DQ-LF-Z support battery temperature monitoring?

Yes. Pin 5 (NTC) interfaces with a 100kΩ NTC thermistor in the battery pack. The IC contains an internal window comparator that halts charging if the sensed resistance falls outside 32.3kΩ–376.6kΩ, corresponding to a validated 0°C–50°C temperature range for TH11-4H104F-type NTCs.

Can the MP2602DQ-LF-Z operate from a USB port without external components?

No. While it accepts USB 5V input, external passive components are mandatory: resistors on ISET (for ICHG), IBF (for termination), and NTC (for thermal sensing); plus a capacitor on SS (for soft-start) and decoupling capacitors on IN and BATT. These are specified in the Typical Application schematic and Operation section.

What is the function of the ACOK pin, and how is it used?

ACOK is an open-drain indicator that pulls low when VIN is within the valid 2.5V–6.0V window, signaling "AC adapter present and stable." It requires an external pull-up resistor to system VDD. This allows the host MCU to distinguish between valid adapter presence and invalid/absent input before enabling charging.

Is thermal protection active during normal operation?

No. Thermal protection activates only when junction temperature exceeds 105–135°C, causing the charge current to modulate as a saw-tooth waveform instead of DC. This reduces average current to limit die temperature. Proper PCB layout with thermal pad soldering and adequate copper area prevents entry into this mode under typical 1A charging conditions.

What does the "-LF-Z" suffix indicate in MP2602DQ-LF-Z?

The "-LF" denotes RoHS-compliant, lead-free packaging; "-Z" indicates tape-and-reel packaging format. Together, MP2602DQ-LF-Z specifies the 10-pin QFN device in environmentally compliant, machine-ready packaging per MPS's standard ordering nomenclature in the Package Reference table.