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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Monolithic Power Systems Inc. MP3429GL-Z

Name: MP3429GL-Z
Brand: Monolithic Power Systems Inc.
SKU: MP3429GL-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP3429GL-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 13-PowerVFQFN

Datasheet:: MP3429GL-Z.pdf

Description:: IC REG BOOST ADJ 13QFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MP3429GL-Z from Monolithic Power Systems is a fully integrated, synchronous boost converter IC with 600kHz fixed-frequency COT control, supporting 2.7V–13V input and up to 16V/21.5A output. It integrates 6.5mΩ low-side and 10mΩ high-side MOSFETs, delivers >95% efficiency at 3.6V_IN→9V/3A, and enables 30W average / 40W peak power delivery from single-cell Li-ion sources in portable power banks and Bluetooth speakers.

For engineers reviewing the MP3429GL-Z datasheet, MP3429GL-Z pinout, MP3429GL-Z application, or MP3429GL-Z equivalent, this device is selected for high-current step-up designs requiring fast transient response, ultrasonic light-load operation (>23kHz), programmable UVLO, and thermal shutdown at 150°C - with explicit attention to BST capacitor sizing, MODE pin biasing, and COMP loop compensation.

Technical Context

The MP3429GL-Z implements constant-off-time (COT) control with adaptive off-time modulation, enabling sub-10µs load-step response without external compensation. Its dual-MOSFET architecture eliminates external Schottky diodes, while cycle-by-cycle current limiting on the low-side switch and zero-current detection (ZCD) on the high-side switch ensure stable DCM/CCM boundary operation across 0–3.5A loads.

Three selectable light-load modes-pulse-skip (PSM), forced continuous conduction (FCCM), and ultrasonic mode (USM)-are controlled via the MODE pin voltage (0.2–0.7V, 0.9–1.2V, or >1.6V respectively). USM enforces ≥23kHz switching under all light-load conditions to suppress audible noise, while maintaining PSM-level efficiency above 33kHz.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	0.8V to 13V operating; 2.7V minimum start-up - supports direct connection to partially discharged Li-ion cells and VDD-biased low-voltage systems.
Output Voltage	Up to 16V - configurable via FB resistor divider; includes 16.5V overvoltage protection with 0.2V hysteresis.
Switching Frequency	600kHz fixed nominal - enables compact magnetics; minimum off-time of 80ns limits max VIN/VOUT ratio for stable operation.
Internal Switch Rating	21.5A peak current limit; 6.5mΩ LS-FET + 10mΩ HS-FET - delivers 30W avg / 40W peak power from 3.3V input without external switches.
Efficiency	>95% at 3.6V_IN → 9V/3A - achieved via synchronous rectification and low R_DS(ON), reducing conduction loss vs. diode-based solutions.
Thermal Protection	150°C junction shutdown with 25°C hysteresis - internal OTP disables switching until die cools, preventing permanent damage during sustained overload.
Control Topology	Adaptive COT - eliminates need for external Type-II/III compensation; COMP pin provides direct access to error amplifier output for custom loop tuning.

Pinout & Package

MP3429GL-Z is housed in a thermally enhanced QFN-13 package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad. Pin 1 is marked by a dot; pins are numbered counterclockwise from top-left corner in top view.

Pin/Terminal	Circuit Role	Design Meaning
1 SW	Power switch node	Drain of LS-FET and source of HS-FET; connects directly to inductor; requires low-inductance layout to minimize switching ringing.
2 VDD	Internal bias supply	Powered by VIN (if >3.4V) or higher of VIN/VOUT; decoupled with ≥4.7μF ceramic cap; enables startup down to 0.9V with external bias.
3 SS	Soft-start control	Capacitor-to-AGND sets VOUT ramp rate; prevents inrush current during power-up and stabilizes initial regulation.
4 COMP	Error amplifier output	Direct access to transconductance amplifier output; connect RC network to AGND for loop stability tuning in FCCM/USM.
5 FB	Voltage feedback input	Resistor divider from VOUT sets output voltage; reference is 1.0V ±1.5% over temperature; 50nA input bias minimizes divider error.
6 AGND	Analog ground reference	Separate from PGND; must be star-connected near FB/COMP/SS to avoid noise coupling into regulation loop.
7 PGND	Power ground return	High-current return path for LS-FET and HS-FET; tied to thermal pad; requires wide copper pour and multiple vias to PCB ground plane.
8 VOUT	Boost output node	Drain of HS-FET; powers VDD when VIN < 3.4V; requires ≥66μF total ceramic capacitance (3×22μF typical) for ripple suppression.
9 FTY	Factory test pin	Must be connected to AGND in all applications; no user functionality; floating or driven causes undefined behavior.
10 MODE	Operating mode select	Voltage-controlled selection: PSM (0.2–0.7V), USM (0.9–1.2V), FCCM (>1.6V); resistor divider from VDD ensures stable logic levels.
11 EN	Enable/disable control	Active-high; 1.23V threshold with 5μA hysteresis; can program VIN UVLO; must not float - tie to VIN for auto-start.
12 VIN	Main input supply	Bypassed locally with ≥10μF ceramic; supplies power to VDD regulator and LS-FET; minimum 2.7V required for autonomous startup.
13 BST	Bootstrap supply	Capacitor between BST and SW generates gate drive for HS-FET; 100nF ceramic recommended; critical for reliable high-side turn-on.

Key Features

Feature	Design Value
Integrated dual MOSFETs	6.5mΩ LS-FET + 10mΩ HS-FET eliminates external diode and reduces BOM count by 2–3 components in portable boost designs.
Ultrasonic light-load mode	Forces ≥23kHz switching in no-load/light-load conditions - removes audible coil whine while retaining >85% efficiency at 10mA output.
Programmable input UVLO	VDD UVLO rising threshold adjustable from 2.2V to 2.6V via external resistor divider - enables precise battery cutoff before deep discharge.
External soft-start	SS pin accepts capacitor to set VOUT rise time (e.g., 100nF ≈ 10ms ramp) - prevents overshoot and inductor saturation during cold start.
Adaptive COT control	No external compensation required; COMP pin allows optional loop tuning for FCCM/USM stability margins - simplifies design validation.

Applications

Portable Power Banks

Bluetooth Audio Systems

Use Scenario: Quick-charge power bank delivering 9V/3A USB PD output from 3.7V Li-ion cell.

IC Role / Device Role / Timing Role: Primary synchronous boost controller regulating 9V rail; manages inductor current slew, ZCD-based HS-FET turn-off, and USM-mode frequency stretching.

Use Value: Delivers 30W sustained output with >94% efficiency at full load and silent operation at standby via enforced >23kHz USM switching.

Use Scenario: High-fidelity Bluetooth speaker requiring clean 12V rail for Class-D amplifier from 3.3V system rail.

IC Role / Device Role / Timing Role: Fixed-frequency boost stage providing regulated 12V with low ripple; uses PSM for ultra-low quiescent current during audio pause.

Use Value: Achieves 25μA shutdown current and <100mVpp output ripple at 3.5A, extending battery life while preserving dynamic headroom.

Notebook Subsystem Power

Portable POS Terminals

Use Scenario: Auxiliary 5V/2A rail for USB-C peripheral interface in thin-and-light notebook with constrained board space.

IC Role / Device Role / Timing Role: Compact, high-density boost converter; leverages QFN-13 package and integrated MOSFETs to fit within 80mm² footprint.

Use Value: Enables 5V rail generation from 3.3V main rail with <1.5mm profile, eliminating need for discrete inductor + diode + controller solution.

Use Scenario: Barcode scanner module requiring 15V pulse drive for laser diode from 3.6V coin cell.

IC Role / Device Role / Timing Role: Peak-power boost controller with 40W capability; uses 7.5μs HS-FET max-on-time to sustain short laser pulses.

Use Value: Supports 15V/1.5A pulsed loads with <500μs recovery time, avoiding brownout during barcode acquisition sequences.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
RT4801BGE	40V max input, 5A switch current, 1.2MHz switching - lacks USM mode and integrated 21A switches.	Suitable for higher-input industrial rails but requires external MOSFETs for >5A loads; no ultrasonic noise suppression.	Select RT4801BGE only if input exceeds 13V or board layout permits discrete FET placement and thermal management.
TPS61088RHLR	12.6V max output, 10A switch current, 500kHz–2.2MHz programmable frequency - no MODE-selectable light-load modes.	Requires external compensation; fixed PFM mode only - may generate audible noise below 20kHz at light loads.	Choose TPS61088RHLR when output voltage ≤12.6V and design prioritizes wide frequency tuning over silent light-load operation.

Compared with RT4801BGE and TPS61088RHLR, MP3429GL-Z uniquely combines 21.5A integrated switching, ultrasonic light-load mode, and 16V output in a 3mm×4mm QFN - making it optimal for space-constrained, battery-powered systems demanding both high peak power and acoustic silence.

Availability

MP3429GL-Z is available at Aetrix Electronics and suitable for portable power banks, Bluetooth audio systems, notebook subsystems, and portable POS terminals requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for MP3429GL-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 over 20 years of expertise in DC/DC conversion, motor drivers, and LED lighting controllers.

The MP3429 belongs to MPS's high-current synchronous boost converter product line, designed specifically for portable electronics requiring >20A integrated switching, ultrasonic light-load operation, and minimal external component count.

FAQ

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

The MP3429GL-Z starts switching at 2.7V when powered solely from VIN. With an external VDD bias ≥0.9V, startup is possible down to 0.9V VIN. Below 2.7V, VDD must be externally supplied to meet the 2.2V UVLO rising threshold; the internal VDD regulator activates once VIN exceeds ~0.9V with EN high.

How is ultrasonic mode (USM) configured, and why is it critical for audio applications?

USM is enabled by floating the MODE pin or biasing it to 0.9–1.2V using a resistor divider from VDD. This forces switching ≥23kHz under all light-load conditions, eliminating audible coil whine (<20kHz) common in PSM. In Bluetooth speakers, USM ensures silent standby without sacrificing light-load efficiency.

Can MP3429GL-Z operate with a 1.5μH inductor at 16V output?

Yes - the typical application circuit specifies a 1.5μH inductor for 9V output, and the MP3429GL-Z supports VIN/VOUT ratios up to ~2.3:1. At 16V output from 3.6V input (ratio = 4.4), minimum on-time (80ns) and maximum off-time constraints require verification; a 1.0μH inductor is recommended for 16V/3A operation per MPS AN-107 design guidelines.

What is the role of the FTY pin, and what happens if left unconnected?

FTY is a factory test pin with no user function. It must be connected to AGND in all production designs. Leaving FTY floating or applying voltage may cause undefined startup behavior, regulation instability, or failure to enter proper operating mode - MPS explicitly states this in the datasheet pin description.

How does the MP3429GL-Z handle overtemperature events, and is recovery automatic?

At 150°C junction temperature, the MP3429GL-Z triggers thermal shutdown, halting switching and holding EN inactive. Recovery occurs automatically once the die cools by 25°C (to ≤125°C), at which point the device restarts with soft-start. No external reset is needed, but repeated cycling indicates insufficient PCB copper or airflow.

Is external compensation required for stable operation in forced CCM (FCCM) mode?

No external compensation is required for basic FCCM operation due to the adaptive COT architecture. However, the COMP pin provides direct access to the error amplifier output, allowing optional RC network addition (from COMP to AGND) to fine-tune phase margin and transient response - especially beneficial for wide VIN/VOUT ratios or high-output-capacitance loads.

What is the maximum achievable output power, and what limits it?

The MP3429GL-Z supports 40W peak power (e.g., 16V/2.5A) and 30W continuous output. Continuous power is limited by thermal dissipation in the QFN-13 package: with θ_JA = 31°C/W on a 4-layer 63mm×63mm PCB, 30W operation raises junction temperature by ~930°C above ambient - thus practical continuous power is capped at ~30W with adequate copper area and airflow to maintain T_J ≤125°C.

MP3429GL-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 13-PowerVFQFN

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Up

Output Configuration:: Positive

Topology:: Boost

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 0.8V

Voltage - Input (Max):: 13V

Voltage - Output (Min/Fixed):: 0.8V

Voltage - Output (Max):: 16V

Current - Output:: -

Frequency - Switching:: 600kHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 13-QFN (3x4)

MP3429GL-Z FAQ

1.How can I place an order for MP3429GL-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP3429GL-Z on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MP3429GL-Z reliable?

The price and inventory of MP3429GL-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3429GL-Z is usually 5 days.

3.What payment methods are accepted for MP3429GL-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3429GL-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP3429GL-Z?

MP3429GL-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP3429GL-Z order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MP3429GL-Z?

For technical support, including MP3429GL-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3429GL-Z requirements.

6.How does Aetrix verify that MP3429GL-Z is sourced from the original manufacturer or authorized distributors?

All MP3429GL-Z products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MP3429GL-Z meets industry standards.

7.What is the process for return or replacement of MP3429GL-Z?

All MP3429GL-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3429GL-Z, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MP3429GL-Z part is unused and in its original packaging.

Return procedure for MP3429GL-Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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