Monolithic Power Systems Inc. MP2625GL-Z

Overview

MP2625GL-Z from Monolithic Power Systems is a 2A synchronous buck switching battery charger IC with NVDC (Narrow Voltage DC) power path management for single-cell Li-ion batteries. It integrates input current limiting (up to 2A), programmable charge current (2A typical), 1.6MHz switching frequency, and five independent control loops (input current/voltage, constant current, terminal voltage, thermal foldback). It enables immediate system operation with deeply discharged batteries in tablets and portable media players.

For engineers reviewing the MP2625GL-Z datasheet, MP2625GL-Z pinout, MP2625GL-Z application, or MP2625GL-Z equivalent, key selection considerations include USB2.0/USB3.0 input compliance, SYS output voltage programmability via SYSFB, integrated ideal diode mode for battery-to-system supplementation, thermal regulation at 120°C, and NTC-based battery temperature monitoring.

Technical Context

The MP2625GL-Z implements a fixed-frequency (1.6MHz) synchronous buck converter with integrated high-side (130mΩ) and low-side (100mΩ) NMOS switches, enabling efficient step-down from 4V–14V inputs to regulated SYS output. Its NVDC architecture decouples system power and battery charging through independent control of VSYS and VBATT, using real-time prioritization of system load over charge current when input limits are reached.

Five closed-loop controls operate concurrently: average input current limit (programmable via ILIM resistor or M0/M1 logic), input voltage clamp (via VLIM resistor divider), constant-current charge (set by ISET resistor), terminal battery voltage regulation (4.2V ±32mV), and on-die thermal foldback (120°C activation). The device supports trickle charge (3.0V threshold), auto-recharge (3.9–4.1V hysteresis), and timer-based fault termination (6.5h max).

Key Specifications

Pinout & Package

MP2625GL-Z is housed in a thermally enhanced QFN-20 package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad. Pin numbering follows standard top-view orientation with pin 1 marked by dot or notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24192RGER and RT9466GQW, MP2625GL-Z delivers higher 2A charge current, native USB-compliant pin-strapped input limiting, and fully autonomous BATT-to-SYS ideal diode operation-making it optimal for cost-sensitive, MCU-less portable devices requiring robust cold-boot and adapter/battery hybrid power delivery.

Availability

MP2625GL-Z is available at Aetrix Electronics and suitable for smartphone power management, tablet PC charging systems, e-book reader battery subsystems, and portable media player power solutions requiring stable component supply across production lifecycles.

Supply support for MP2625GL-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 power ICs, with design centers in the US, China, and Taiwan, and global distribution since 1997.

The MP2625 belongs to MPS's battery management IC product line, engineered specifically for space-constrained portable devices requiring integrated switching charge control, intelligent power path arbitration, and comprehensive battery safety features.

FAQ

What is the function of the BST pin on MP2625GL-Z?

The BST (bootstrap) pin provides gate drive voltage for the internal high-side NMOS switch. A 0.1µF ceramic capacitor must be placed between BST and SW to generate a floating supply ~5V above SW, ensuring full enhancement of the 130mΩ high-side FET during 1.6MHz switching. Incorrect BST capacitor placement causes erratic regulation or thermal shutdown.

How does MP2625GL-Z handle system power when the input source is disconnected?

When IN is removed or drops below UVLO, MP2625GL-Z automatically enables ideal diode mode: the internal 40mΩ BATT-to-SYS FET turns on, supplying the system load directly from the battery. This transition occurs when VSYS falls below VBATT – 65mV, maintaining uninterrupted operation without external circuitry.

Can MP2625GL-Z charge a battery while powering a system load exceeding its input current limit?

Yes. When system load current exceeds the programmed input limit (e.g., 2A), MP2625GL-Z prioritizes system power: it reduces charge current to zero if needed, then draws supplemental current from the battery via the BATT-to-SYS path. This ensures continuous SYS rail regulation even during transient overloads.

What is the purpose of the VLIM pin and how is it configured?

VLIM sets the input voltage clamp threshold using a resistor divider from IN to VLIM to AGND. When the voltage at VLIM reaches 1.52V, the DC-DC converter reduces duty cycle to prevent input overvoltage. For a 9V clamp, use R1=499kΩ and R2=100kΩ (9V = 1.52V × (499k + 100k)/100k), protecting against incorrect adapters.

Does MP2625GL-Z support battery temperature monitoring, and how is it implemented?

Yes. The NTC pin accepts a thermistor (e.g., NCP18XH103F) connected between VCC and ground, with the thermistor junction at NTC. The IC monitors voltage at NTC to detect temperatures outside 0°C–50°C (65%–33.5% of VCC), suspending charge if exceeded. No external ADC or MCU is required for thermal safety compliance.

How is the SYS output voltage programmed, and what is its default value?

SYS voltage is set by a resistor divider from SYS to SYSFB to AGND. With SYSFB floating, VSYS defaults to 3.6V when VBATT ≤ 3.4V (enabling boot with dead battery) or VBATT + 0.2V when VBATT > 3.4V. To program 4.0V, use R6=200kΩ (SYS to SYSFB) and R7=100kΩ (SYSFB to AGND), per VSYS = 1.152V × (1 + R6/R7).

What happens if the battery voltage falls below the trickle charge threshold during charging?

If VBATT drops below 3.0V (±0.1V) during charging-indicating cell degradation or excessive load-the MP2625GL-Z re-enters trickle mode with 10% of programmed ICC. If trickle persists >45 minutes (set by TMR capacitor), CHGOK blinks and charging halts, signaling a potentially defective battery requiring replacement.