Monolithic Power Systems Inc. MP3429GL-P

Overview

MP3429GL-P from Monolithic Power Systems is a fully integrated, synchronous boost converter IC with 2.7V–13V input range, 16V maximum output, and 21.5A internal switch current limit. It delivers up to 30W average load power from a single-cell battery using integrated 6.5mΩ (LS) and 10mΩ (HS) MOSFETs, operates at 600kHz fixed frequency with adaptive constant-off-time (COT) control, and supports PSM/FCCM/USM modes for optimized light-load efficiency-used in portable quick-charge power banks requiring high-efficiency step-up from 3.3V to 9V/3.5A.

For engineers reviewing the MP3429GL-P datasheet, MP3429GL-P pinout, MP3429GL-P application, or MP3429GL-P equivalent, key selection considerations include its QFN-13 (3mm×4mm) package thermal performance, MODE pin-configurable ultrasonic operation (>23kHz), programmable UVLO hysteresis, external soft-start timing, and cycle-by-cycle current limiting on the low-side MOSFET.

Technical Context

The MP3429GL-P implements adaptive constant-off-time (COT) control with voltage-mode feedback via an internal error amplifier (300 V/V gain, 450 μA/V transconductance), where COMP pin voltage directly regulates inductor peak current. Its switching cycle is governed by VIN/VOUT ratio-determined off-time and COMP-controlled on-time, enabling fast transient response without loop compensation complexity.

Three selectable operating modes-pulse-skip (PSM), forced continuous conduction (FCCM), and ultrasonic (USM)-are determined by MODE pin voltage (0.2–0.7V, >1.6V, or 0.9–1.2V/floating), with USM enforcing ≥23kHz minimum frequency to avoid audible noise while maintaining DCM operation and ZCD-based energy recycling during light loads.

Key Specifications

Pinout & Package

MP3429GL-P is housed in a thermally enhanced QFN-13 package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad (PGND-connected) for efficient heat dissipation in high-power boost applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous boost converter applications.

Compared with RT4801BZQW and TPS61088RHLR, MP3429GL-P uniquely combines 16V output capability, 21.5A current limit, ultrasonic mode, and adaptive COT control-making it the only option among the three that meets full-spec quick-charge power bank and high-fidelity portable audio requirements.

Availability

MP3429GL-P is available at Aetrix Electronics and suitable for quick-charge power banks, Bluetooth speakers, and portable POS systems requiring stable component supply, consistent parametric performance across temperature, and long-term production continuity.

Supply support for MP3429GL-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 power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP3429GL-P belongs to MPS's high-current synchronous boost converter product line, engineered specifically for portable electronics demanding >30W power density, ultra-low quiescent current, and noise-immune operation in battery-powered environments.

FAQ

What is the minimum input voltage required for MP3429GL-P to start switching?

The MP3429GL-P starts switching at 2.7V input when powered solely from VIN, or as low as 0.9V if an external VDD bias ≥2.2V is applied. This dual-start capability supports deep battery discharge scenarios while maintaining regulation integrity through VDD bootstrap from VOUT when VIN drops below 3.4V.

How does the MODE pin affect efficiency and noise in light-load conditions?

When MODE is floating or biased to 0.9–1.2V, MP3429GL-P enters ultrasonic mode (USM), maintaining ≥23kHz switching to eliminate audible noise while retaining DCM operation and ZCD-based energy recycling. In contrast, pulse-skip mode (PSM) allows sub-20kHz frequencies that may cause coil whine but achieves slightly higher light-load efficiency.

Can MP3429GL-P operate with an input voltage higher than its 13V maximum rating?

No-absolute maximum VIN is 13V per datasheet. Exceeding this risks permanent damage to internal MOSFETs and control circuitry. For 15–24V input applications, a pre-regulator stage or alternative IC such as MP9486A (36V-rated) must be used.

What is the purpose of the FTY pin, and how should it be connected?

The FTY pin is reserved for factory testing and must be connected to AGND in all end-user applications. Leaving FTY unconnected or floating violates the recommended layout and may cause undefined behavior or failure to start due to internal logic state uncertainty.

How does the internal current limit protect the device during short-circuit events?

The MP3429GL-P implements cycle-by-cycle current limiting on the low-side MOSFET, triggering shutdown if sensed current exceeds 19–23.5A. During sustained overload, thermal shutdown at 150°C activates with 25°C hysteresis, allowing safe cooldown before automatic recovery-no latch-off or manual reset required.

Is external compensation required for stable operation?

Yes-COMP pin requires an external RC network (e.g., 6.8kΩ + 6.8nF) connected to AGND for loop stability. The error amplifier's 300 V/V gain and 450 μA/V transconductance necessitate tailored compensation to match output capacitance and load dynamics, especially above 2A loads.

Does MP3429GL-P support output voltages below 5V?

Yes-the FB pin references a precise 1.0V internal bandgap, enabling output voltages as low as ~1.2V using appropriate resistor dividers. However, practical minimum output is constrained by minimum on-time (80ns) and VIN/VOUT ratio; for example, 0.8V input cannot regulate 1.2V output reliably.