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

Monolithic Power Systems Inc. MP3431GL-Z

Name: MP3431GL-Z
Brand: Monolithic Power Systems Inc.
SKU: MP3431GL-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP3431GL-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 13-PowerVFQFN

Datasheet:: MP3431GL-Z.pdf

Description:: IC REG BOOST ADJ 21A 13QFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MP3431GL-Z from Monolithic Power Systems is a 600kHz fixed-frequency, synchronous boost converter IC with integrated 6.5mΩ low-side and 10mΩ high-side MOSFETs, programmable input current limit (up to 21.5A peak switch current), and adaptive constant-off-time (COT) control. It operates from 0.8V–13V input, delivers up to 16V output, and supports 30W average / 40W peak load power from single-cell Li-ion batteries in portable power banks and quick-charge systems.

For engineers reviewing the MP3431GL-Z datasheet, MP3431GL-Z pinout, MP3431GL-Z application, or MP3431GL-Z equivalent, key selection criteria include its 21.5A internal switch current limit, QFN-13 (3mm×4mm) thermal performance, selectable PSM/FCCM/USM light-load modes, 600kHz switching frequency, and programmable input current protection for battery-fed boost stages.

Technical Context

The MP3431GL-Z implements adaptive COT control with cycle-by-cycle inductor peak current limiting via COMP voltage feedback, enabling sub-10μs transient response under load steps. Its dual-MOSFET architecture eliminates external Schottky diodes while supporting bidirectional energy transfer during ultrasonic mode zero-current detection.

Three distinct light-load operating modes are hardware-selectable via the MODE pin: pulse-skip mode (PSM) for maximum efficiency below 100mA, forced continuous conduction mode (FCCM) for ripple-sensitive applications, and ultrasonic mode (USM) with >23kHz minimum frequency to suppress audible noise-each governed by precise voltage thresholds on MODE (0.2–0.7V, 0.9–1.2V, >1.6V).

Key Specifications

Parameter	Value and Actual Design Meaning
Switching Frequency	600kHz fixed - enables compact magnetics and predictable EMI filtering without frequency spread.
Input Voltage Range	0.8V to 13V - supports direct connection to partially discharged single-cell Li-ion (2.7V start-up) and wide-input industrial rails.
Output Voltage Range	Up to 16V - sufficient for USB PD 3.0 9V/12V/15V profiles and notebook auxiliary rails.
Peak Switch Current Limit	21.5A - sets hard overcurrent protection threshold for inductor and MOSFET stress management.
Internal MOSFET R_DS(ON)	6.5mΩ (LS) / 10mΩ (HS) - achieves >95% efficiency at 3.6V_IN→9V/3A, minimizing thermal derating in QFN-13 package.
Light-Load Mode Control	PSM/FCCM/USM selectable via MODE pin - allows trade-off between efficiency (<100μA quiescent in PSM), ripple (<15mV_PP in FCCM), and acoustic noise (USM >23kHz).
Soft-Start & Compensation	External SS capacitor + COMP RC network - provides adjustable V_OUT slew rate and loop stability tuning for diverse output capacitance and load inertia.

Pinout & Package

MP3431GL-Z is housed in a thermally enhanced QFN-13 (3mm × 4mm, 0.5mm pitch) package with exposed thermal pad (PGND-connected) for PCB-level heat dissipation. Pin 1 is marked with dot; top marking includes "MP" prefix, year/week code, and lot number.

Pin/Terminal	Circuit Role	Design Meaning
1 SW	Switch node	Drain of LS-FET / source of HS-FET; connects directly to inductor; carries full AC switching current and requires tight layout.
2 VDD	Internal bias supply	Regulated 2.55V output powered from VIN or VOUT; decoupled with 4.7μF ceramic; enables startup down to 0.9V VIN when EN is asserted.
3 SS	Soft-start control	Capacitor-to-AGND sets VOUT ramp time; prevents inrush current into large output capacitors during power-on.
4 COMP	Error amplifier output	Connects to RC compensation network; controls LS-FET on-time based on FB error; clamped at 2.6V for overvoltage protection.
5 FB	Voltage feedback input	Resistor divider from VOUT sets regulation point; 1.0V reference with ±0.5% tolerance ensures accurate 9V/12V/15V output setting.
6 AGND	Analog ground	Reference for FB, COMP, ILIM, MODE, EN; must be separated from PGND and tied at single point near IC for noise immunity.
7 PGND	Power ground	High-current return path for LS-FET and inductor; connects to thermal pad; requires wide copper pour for thermal management.
8 VOUT	Boost output	HS-FET drain node; supplies load and powers VDD when VIN < 3.4V; requires ≥66μF low-ESR ceramic output capacitance.
9 ILIM	Input current limit programming	Resistor-to-AGND sets input current limit (e.g., 22kΩ = 12.5A); 0.98V threshold with 3.45μA/A gain enables precise battery current capping.
10 MODE	Operating mode select	Voltage-controlled mode selector: 0.2–0.7V = PSM, 0.9–1.2V = USM, >1.6V = FCCM; floating defaults to USM.
11 EN	Enable input	Active-high logic control; 1.23V turn-on threshold; supports VIN UVLO programming via resistor divider from VIN to EN.
12 VIN	Main input supply	Battery or DC rail input; bypassed with ≥22μF ceramic; minimum 2.7V required for autonomous startup without VDD bias.
13 BST	Bootstrap supply	Capacitor between BST and SW generates gate drive for HS-FET; requires 0.1μF X7R ceramic placed adjacent to pins.

Key Features

Feature	Design Value
Integrated dual-MOSFET power stage	Eliminates external Schottky diode and reduces BOM count by 3 components while maintaining >95% efficiency at 3.6V→9V/3A.
Programmable input current limit	Resistor-based setting (e.g., 22kΩ → 12.5A) with ±5% accuracy enables precise battery discharge control in power banks.
Adaptive COT control	Delivers <5μs load-step response with no external compensation required beyond standard RC network on COMP pin.
Ultrasonic mode (USM)	Maintains >23kHz switching under all loads to prevent audible coil whine in Bluetooth speakers and portable POS terminals.
150°C thermal shutdown with 25°C hysteresis	Prevents permanent damage during sustained overload; automatic recovery after cooldown avoids system latch-up.

Applications

Quick-Charge Power Banks

Bluetooth Speakers

Use Scenario: Step-up from 3.3V–4.2V Li-ion battery to 9V/12V USB PD output for fast-charging smartphones.

IC Role / Device Role / Timing Role: Primary synchronous boost controller regulating output voltage and limiting input battery current to prevent over-discharge.

Use Value: Delivers 30W sustained output with <15mV_PP ripple in FCCM mode and extends battery runtime via 21.5A peak switch current headroom.

Use Scenario: Boosting 3.7V battery voltage to 12V rail for Class-D audio amplifier and DSP supply in compact wireless speakers.

IC Role / Device Role / Timing Role: High-efficiency DC-DC converter operating in USM to eliminate audible switching noise during low-volume playback.

Use Value: Achieves >92% efficiency at 100mA load while maintaining >23kHz minimum frequency, preventing speaker coil vibration artifacts.

Notebook Auxiliary Rails

Portable POS Terminals

Use Scenario: Generating 15V from 5V USB-C input for display backlight or fingerprint sensor module in thin-and-light notebooks.

IC Role / Device Role / Timing Role: Compact, high-power-density boost IC with soft-start and input current limiting to meet USB-C power delivery constraints.

Use Value: Supports 40W peak load with QFN-13 footprint and thermal pad, enabling integration into space-constrained motherboard layouts.

Use Scenario: Providing regulated 9V/2A output from 3.6V Li-ion battery for thermal printer head and EMV contactless reader in handheld payment devices.

IC Role / Device Role / Timing Role: Programmable input current limiter protects battery during high-pulse printer current draw while maintaining stable 9V output.

Use Value: Enables 12A input current limit configuration (via 18.2kΩ ILIM resistor) to sustain 2A output without brownout during print cycles.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
RT4801BZQW	Fixed 1.2MHz switching frequency; 18A peak switch current; no programmable input current limit; requires external bootstrap diode.	Lacks input current limiting and USM mode; better suited for space-constrained designs where higher frequency enables smaller inductors.	Select RT4801BZQW only if 1.2MHz operation and minimal footprint outweigh need for battery current control and ultrasonic noise suppression.
TPS61236PRLR	2.5V–5.5V input range; 12V max output; 4.5A switch current; integrated soft-start; no MODE pin or USM capability.	Not suitable for 0.8V–13V wide-input or >12V output applications; limited to low-power portable electronics with fixed input rails.	Choose TPS61236PRLR only for cost-sensitive, low-current (<2A) applications where input voltage is tightly regulated and acoustic noise is non-critical.

Compared with RT4801BZQW and TPS61236PRLR, MP3431GL-Z uniquely combines wide-input operation (0.8V–13V), programmable input current limiting, and ultrasonic mode-making it the only option among the three capable of robust, quiet, battery-optimized 30W boost conversion in portable power systems.

Availability

MP3431GL-Z is available at Aetrix Electronics and suitable for quick-charge power banks, Bluetooth speakers, and portable POS terminals requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP3431GL-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 across Asia and North America and global distribution through authorized partners.

The MP3431 belongs to MPS's high-current synchronous boost converter product line, engineered specifically for battery-powered portable electronics demanding high efficiency, small form factor, and intelligent power management under dynamic load conditions.

FAQ

What is the minimum input voltage required for MP3431GL-Z to start switching?

The MP3431GL-Z starts switching at 2.7V input voltage when no external VDD bias is applied. With an external 3V bias on VDD, startup is guaranteed down to 0.9V VIN. This dual-start capability supports deeply discharged Li-ion cells and ultra-low-voltage backup rails.

How does the ILIM pin implement programmable input current limiting?

The ILIM pin accepts a resistor-to-AGND that sets input current limit via I_IN = (0.98V / R_ILIM) × (1 / 3.45μA/A). For example, a 22kΩ resistor yields ~12.5A limit. The internal transconductance amplifier compares sensed input current against this reference to throttle switch duty cycle.

Can MP3431GL-Z operate without an external bootstrap capacitor on BST?

No. A 0.1μF X7R ceramic capacitor must be placed between BST and SW pins to generate the gate drive voltage for the high-side MOSFET. Omitting this capacitor prevents HS-FET turn-on, causing immediate failure to regulate and potential overvoltage on VOUT.

What is the purpose of the MODE pin's tri-state regions?

The MODE pin uses three non-overlapping voltage windows to select operating mode: 0.2–0.7V for PSM (max efficiency), 0.9–1.2V for USM (ultrasonic noise suppression), and >1.6V for FCCM (low-ripple fixed frequency). Floating MODE defaults to USM, simplifying basic designs.

How does the MP3431GL-Z handle thermal overload?

At 150°C junction temperature, the IC disables switching and holds VOUT in regulation via body diode conduction until temperature drops by 25°C hysteresis. This thermal shutdown is fully self-contained and requires no external circuitry, protecting both IC and system during sustained overload.

Is the FB reference voltage trimmed across temperature?

Yes. The internal 1.0V reference has ±0.5% tolerance over –40°C to +125°C (0.985V to 1.015V), ensuring stable output regulation across automotive and industrial temperature ranges without external calibration.

What layout guidance applies to the PGND and AGND connections?

PGND must connect directly to the exposed thermal pad with multiple vias to inner-layer ground planes; AGND should be routed separately and joined to PGND at a single point near the IC to avoid noise coupling into sensitive analog circuits like FB and COMP.

MP3431GL-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:: 21A

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)

MP3431GL-Z FAQ

1.How can I place an order for MP3431GL-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP3431GL-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 MP3431GL-Z reliable?

The price and inventory of MP3431GL-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP3431GL-Z is usually 5 days.

3.What payment methods are accepted for MP3431GL-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3431GL-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP3431GL-Z?

MP3431GL-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP3431GL-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 MP3431GL-Z?

For technical support, including MP3431GL-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3431GL-Z requirements.

6.How does Aetrix verify that MP3431GL-Z is sourced from the original manufacturer or authorized distributors?

All MP3431GL-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 MP3431GL-Z meets industry standards.

7.What is the process for return or replacement of MP3431GL-Z?

All MP3431GL-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3431GL-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 MP3431GL-Z part is unused and in its original packaging.

Return procedure for MP3431GL-Z:

1.Submit a request within 90 days.

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

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