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

Monolithic Power Systems Inc. MPQ2451GG-33-P

Name: MPQ2451GG-33-P
Brand: Monolithic Power Systems Inc.
SKU: MPQ2451GG-33-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPQ2451GG-33-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 6-VDFN Exposed Pad

Datasheet:: MPQ2451GG-33-P.pdf

Description:: IC REG BUCK 3.3V 600MA 6QFN

Quantity:: RFQ Add To RFQ list

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Inventory:1,778

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Product details

Overview

MPQ2451GG-33-P from Monolithic Power Systems is a 36V, 2.2MHz, 0.6A AEC-Q100 Grade 1 synchronous step-down DC/DC converter in QFN-6L package, featuring integrated 500mΩ high-side MOSFET, internal compensation, and fixed 3.3V output. It delivers >90% efficiency across load range and supports automotive infotainment power rails with 3.3V-to-36V input.

For engineers reviewing the MPQ2451GG-33-P datasheet, MPQ2451GG-33-P pinout, MPQ2451GG-33-P application, or MPQ2451GG-33-P equivalent, this device is selected for battery-powered automotive subsystems requiring low quiescent current (130µA), thermal shutdown protection, pulse-skipping light-load operation, and stable ceramic-capacitor compatibility.

Technical Context

This IC implements peak-current-mode control with internal error amplifier and COMP node for loop stability, enabling fast transient response without external compensation. Its 2.2MHz fixed-frequency PWM operation minimizes external component size while maintaining regulation under 3.3V–36V input variation.

The device integrates bootstrap charging circuitry with dedicated UVLO (2.4V rising) for the floating high-side driver, and employs cycle-by-cycle current limiting via internal sense-FET-eliminating need for external current-sense resistor. Soft-start time is factory-fixed at 0.5–1ms to prevent output overshoot during cold start.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.3V ±3.6% (3.168V–3.432V), internally trimmed for automotive-grade accuracy
Switching Frequency	2.2MHz ±18%, enables compact 2.2–4.7µH inductors and reduces EMI fundamental frequency
Max Output Current	0.6A continuous, limited by internal 0.75A typical current threshold and thermal design
Input Voltage Range	3.3V to 36V, supports 12V/24V automotive batteries including cold-crank (≥4.5V) and load-dump (≤36V)
Quiescent Current	130µA typical at no load, enabling >1-year standby in always-on vehicle modules
High-Side R_DS(ON)	500mΩ at V_BST–V_SW = 5V, defines conduction loss and thermal rise at full load
Shutdown Current	1µA max, ensures minimal battery drain when EN pin pulled low

Pinout & Package

MPQ2451GG-33-P uses a thermally enhanced 2mm × 2mm QFN-6L package with exposed thermal pad (pin 1 = EN, pin 2 = VIN, pin 3 = OUT, pin 4 = GND, pin 5 = SW, pin 6 = BST). The exposed pad must be soldered to PCB copper for thermal dissipation (θ_JA = 80°C/W).

Pin/Terminal	Circuit Role	Design Meaning
EN (Pin 1)	Enable control input	Logic-high (>1.5V) enables regulator; float or <1.2V disables with 1µA shutdown current
VIN (Pin 2)	Main power input	Supplies internal regulator and gate driver; requires local 10µF ceramic decoupling
OUT (Pin 3)	Feedback voltage sense	Connects to internal 3.3V divider tap; sets output without external resistors
GND (Pin 4)	Power ground reference	Return path for output capacitor and internal circuits; must tie to thermal pad
SW (Pin 5)	Switch node	Drives external freewheeling diode or synchronous rectifier; high dv/dt node requiring short trace routing
BST (Pin 6)	Bootstrap supply	Charges via internal PMOS from VIN to SW; requires 100nF ceramic capacitor to SW

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for −40°C to +125°C junction operation in automotive power systems
Internal soft-start	0.5–1ms ramp prevents output overshoot and inrush current during cold boot
Precision current limit	0.75A typical cycle-by-cycle limit eliminates need for external sensing resistor
Ceramic-capacitor stable	No external compensation required; works with low-ESR MLCCs for compact, low-noise designs
Frequency fold-back	Reduces switching frequency under light load to suppress inductor current runaway at startup

Applications

Automotive Infotainment

ADAS Camera Module

Use Scenario: Powering USB-C hub and display interface in head unit with 12V battery input and cold-crank tolerance.

IC Role / Device Role / Timing Role: Primary 3.3V buck converter supplying SoC I/O rails and USB PHY logic.

Use Value: 130µA quiescent current extends battery life during vehicle sleep mode; AEC-Q100 Grade 1 ensures reliability over 15-year vehicle lifecycle.

Use Scenario: Generating 3.3V for image sensor and ISP in rear-view camera with wide input range.

IC Role / Device Role / Timing Role: Point-of-load regulator delivering clean, low-noise 3.3V to CMOS image sensor analog front-end.

Use Value: 2.2MHz switching avoids AM radio band interference; internal compensation simplifies layout in space-constrained camera housing.

Industrial Telematics

EV Battery Management Node

Use Scenario: Powering LTE modem and GPS receiver in fleet-tracking device operating from 24V truck battery.

IC Role / Device Role / Timing Role: Main 3.3V supply for wireless communication subsystem with load-dump immunity.

Use Value: 36V absolute max input withstands 40V load-dump transients; thermal shutdown protects against enclosure overheating.

Use Scenario: Supplying 3.3V to microcontroller and CAN transceiver in BMS slave board connected to 48V pack.

IC Role / Device Role / Timing Role: Isolated auxiliary rail generator supporting CAN FD communication and sensor biasing.

Use Value: Pulse-skipping mode maintains >85% efficiency at µA-level sleep currents; QFN-6L package fits tight spacing between cell monitoring ICs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPQ2451GT-33-AEC1	SOT23-6L package (θ_JA = 220°C/W), lower thermal performance, same electrical specs	Suitable for low-power, non-thermally constrained PCBs where board area is less critical than cost	Select when thermal budget allows >30°C/W higher junction rise and footprint flexibility exists
TI TPS54331DR	3.5V–28V input, 3A output, external compensation, no AEC-Q100 qualification	Used in industrial PLCs where automotive qualification is not required but higher current is needed	Choose only if AEC-Q100 is waived and 3A output + adjustable VOUT justify added BOM complexity

Compared with MPQ2451GG-33-P, the SOT23-6L variant trades thermal capability for cost and legacy footprint compatibility, while the TPS54331DR offers higher current and adjustability at the expense of automotive qualification and integrated compensation.

Availability

MPQ2451GG-33-P is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial telematics requiring stable component supply with AEC-Q100 compliance, long-lifecycle support, and production-ready packaging.

Supply support for MPQ2451GG-33-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 core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.

The MPQ2451 product line targets automotive-grade power management, designed specifically for harsh-environment step-down applications demanding AEC-Q100 qualification, wide input range, and ultra-low quiescent current.

FAQ

What is the maximum allowable input voltage for MPQ2451GG-33-P?

The absolute maximum input voltage is +40V, but recommended operating range is 3.3V to 36V per datasheet specifications. Operation above 36V risks violating AEC-Q100 stress limits and may trigger UVLO shutdown at 2.9V rising threshold if input sags below that level during transients.

Does MPQ2451GG-33-P require an external bootstrap diode?

No external bootstrap diode is required under normal operation. The IC integrates a PMOS pass transistor to charge the BST capacitor from VIN to SW. An external diode (e.g., BAT54) is optional only for VIN ≤ 6V or duty cycles >65% to improve bootstrap voltage margin.

Can MPQ2451GG-33-P operate with ceramic output capacitors only?

Yes-it is internally compensated and stable with ceramic output capacitors alone. The datasheet confirms compatibility with low-ESR MLCCs without requiring additional series resistance or external compensation networks.

What is the thermal shutdown threshold and hysteresis?

Thermal shutdown activates at 150°C junction temperature and resets at approximately 135°C hysteresis, ensuring reliable fault recovery without oscillation. This threshold is factory-trimmed and tested per AEC-Q100 requirements.

How does pulse-skipping mode improve light-load efficiency?

Pulse-skipping disables PWM clock pulses when COMP voltage falls below internal sleep threshold, reducing gate drive and switching losses. Quiescent current drops to ~1µA in deep sleep, enabling >90% efficiency even at 10mA load.

Is the EN pin internally pulled down when floating?

Yes-the EN pin has an internal pull-down to GND, ensuring default disable state when unconnected. Pulling EN above 1.5V (typical) enables operation; hysteresis of 400mV prevents noise-induced toggling near threshold.

What is the minimum inductor value recommended for 12V input to 3.3V output?

Using the datasheet formula with 30% ripple current at 0.6A load and 2.2MHz switching, minimum inductance is ~2.2µH. Recommended parts include Wurth 7440430022 (2.2µH, 2.5A) or TDK LTF5022T-2R2N3R2 (2.2µH, 3.2A), both validated in EVQ2451-G-33 reference design.

MPQ2451GG-33-P Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 6-VDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Fixed

Number of Outputs:: 1

Voltage - Input (Min):: 3.3V

Voltage - Input (Max):: 36V

Voltage - Output (Min/Fixed):: 3.3V

Voltage - Output (Max):: -

Current - Output:: 600mA

Frequency - Switching:: 2.2MHz

Synchronous Rectifier:: No

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 6-QFN (2x2)

MPQ2451GG-33-P FAQ

1.How can I place an order for MPQ2451GG-33-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ2451GG-33-P 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 MPQ2451GG-33-P reliable?

The price and inventory of MPQ2451GG-33-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ2451GG-33-P is usually 5 days.

3.What payment methods are accepted for MPQ2451GG-33-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2451GG-33-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ2451GG-33-P?

MPQ2451GG-33-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ2451GG-33-P 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 MPQ2451GG-33-P?

For technical support, including MPQ2451GG-33-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2451GG-33-P requirements.

6.How does Aetrix verify that MPQ2451GG-33-P is sourced from the original manufacturer or authorized distributors?

All MPQ2451GG-33-P 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 MPQ2451GG-33-P meets industry standards.

7.What is the process for return or replacement of MPQ2451GG-33-P?

All MPQ2451GG-33-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2451GG-33-P, 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 MPQ2451GG-33-P part is unused and in its original packaging.

Return procedure for MPQ2451GG-33-P:

1.Submit a request within 90 days.

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

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