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

Monolithic Power Systems Inc. MPQ2451DT-AEC1-LF-P

Name: MPQ2451DT-AEC1-LF-P
Brand: Monolithic Power Systems Inc.
SKU: MPQ2451DT-AEC1-LF-P
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPQ2451DT-AEC1-LF-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: SOT-23-6

Datasheet:: MPQ2451DT-AEC1-LF-P.pdf

Description:: IC REG BUCK ADJ 600MA SOT23-6L

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Product details

Overview

MPQ2451DT-AEC1-LF-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, non-synchronous step-down DC/DC converter with integrated 500mΩ high-side MOSFET, delivering up to 0.6A at 5V output from a 3.3V–36V input. It operates at fixed 2MHz switching frequency, features current-mode control, internal soft-start, and achieves >90% efficiency across load range - deployed in automotive infotainment power rails and ADAS camera modules.

For engineers reviewing the MPQ2451DT-AEC1-LF-P datasheet, MPQ2451DT-AEC1-LF-P pinout, MPQ2451DT-AEC1-LF-P application, or MPQ2451DT-AEC1-LF-P equivalent, key selection criteria include AEC-Q100 qualification, 2MHz fixed-frequency operation for compact filter design, 130µA quiescent current for always-on battery systems, and precision current limit without external sense resistor.

Technical Context

The MPQ2451 employs peak-current-mode control with internal compensation and a dedicated error amplifier referenced to a 0.794V (±2%) feedback threshold. Its PWM logic includes blanking time (≥100ns) and cycle-by-cycle current limiting, enabling stable regulation under transient load steps up to 0.6A.

Under light load, it enters pulse-skipping mode-reducing switching and gate-drive losses-while maintaining regulation via COMP voltage threshold monitoring. The bootstrap driver uses an external BST capacitor charged from VIN during low-side conduction, with UVLO protection (2.4V rising / 0.3V falling) independent of main controller logic.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3.3V to 36V - supports direct connection to automotive battery (cold-crank down to 3.3V) and industrial 24V rails.
Output Current	0.6A continuous - sufficient for powering microcontrollers, sensors, and CAN transceivers in automotive ECUs.
Switching Frequency	2MHz ±30% - enables use of small 2.2–3.3µH inductors and ceramic capacitors for space-constrained layouts.
Quiescent Current	130µA - allows >1-year standby runtime on 10Ah automotive battery with 100µA system sleep current.
Feedback Reference	0.794V ±2% - sets output accuracy to ±2% over -40°C to +125°C when using 1% resistors.
Internal MOSFET R_DS(on)	500mΩ - limits conduction loss to <180mW at 0.6A, reducing thermal stress in SOT23-6L package.
Shutdown Current	3µA - ensures negligible drain during vehicle ignition-off state.

Pinout & Package

MPQ2451DT-AEC1-LF-P is packaged in SOT23-6L - a thermally enhanced, lead-free, RoHS-compliant surface-mount package with 0.95mm pitch and exposed pad (not electrically connected). Thermal resistance θ_JA = 220°C/W on 2-layer PCB.

Pin/Terminal	Circuit Role	Design Meaning
BST	Bootstrap supply	Charges external 0.1µF BST capacitor from VIN during SW low phase; powers floating gate driver for high-side MOSFET.
GND	Power ground	Reference node for all internal circuitry and output capacitor return; must be routed with low-inductance path to minimize switching noise.
FB	Feedback input	Compares divided output voltage against 0.794V reference; sets regulation point for adjustable or fixed-output variants.
EN	Enable control	Active-high logic input (1.35V–1.8V threshold); float-to-disable behavior simplifies power sequencing in automotive systems.
VIN	Main supply input	Accepts full 3.3V–36V range; requires local 4.7µF ceramic decoupling capacitor to suppress switching transients.
SW	Switch node	Drives external inductor; connects to cathode of freewheeling Schottky diode; high dv/dt node requiring tight layout.

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for operation from –40°C to +125°C ambient, meeting automotive reliability and stress-test requirements.
Internally compensated loop	Eliminates need for external compensation network - reduces BOM count and layout sensitivity in cost-sensitive designs.
Stable with ceramic output capacitors	Enables use of low-ESR, high-reliability MLCCs instead of tantalum/electrolytic - improves lifetime and temperature stability.
Precision current limit (no sense resistor)	Accurate 0.65A–1A cycle-by-cycle limit derived from MOSFET R_DS(on) sensing - avoids accuracy drift and board space of external resistor.
Frequency fold-back at startup	Prevents inductor current runaway during soft-start by temporarily lowering f_SW - ensures controlled VOUT ramp without overshoot.

Applications

Automotive Infotainment Power Supply

ADAS Camera Module Rail

Use Scenario: Powers ARM-based SoC and display interface in head-unit with cold-crank resilience and low EMI.

IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying core logic and USB PHY; operates in fixed 2MHz PWM mode to avoid AM band interference.

Use Value: 130µA IQ extends battery backup time during ignition-off; AEC-Q100 qualification ensures compliance with ISO 16750-2.

Use Scenario: Generates clean 3.3V rail for image sensor and ISP in rear-view camera with minimal thermal rise.

IC Role / Device Role / Timing Role: Fixed 3.3V output variant (MPQ2451GT-33-AEC1) delivering regulated power with <2% line/load regulation.

Use Value: Internal soft-start prevents sensor reset during hot-plug; 500mΩ R_DS(on) limits self-heating in TSOT23-6L package at 400mA load.

Industrial PLC I/O Module

Battery-Powered Telematics Unit

Use Scenario: Provides isolated 5V supply for digital I/O drivers in DIN-rail mounted controllers exposed to 36V field wiring.

IC Role / Device Role / Timing Role: Input-stage buck converter accepting wide-range 24V±25% industrial supply; handles surge events per IEC 61000-4-5.

Use Value: 40V absolute max VIN rating withstands 36V transients; thermal shutdown (150°C) protects during enclosure overheating.

Use Scenario: Powers LTE modem and GPS receiver in fleet-tracking device operating from 12V lead-acid battery with extended parking mode.

IC Role / Device Role / Timing Role: Always-on 3.3V rail generator with 3µA shutdown current; enabled via microcontroller GPIO during wake-up events.

Use Value: Pulse-skipping mode maintains <15mV output ripple at 100µA load - preserves RF performance without external LDO post-regulation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM61480-Q1	Higher 3.5A output, 2.1MHz switching, requires external compensation; larger QFN-16 package.	Targeted at higher-power ADAS domain controllers; not drop-in due to pinout and loop design differences.	Select when >1A output or tighter load regulation (<±1%) is required; verify thermal margin in same footprint.
TPS62130A-Q1	Lower 3V min input, 3.5MHz switching, 1.2A output; uses DCS-Control topology instead of current-mode.	Suitable for 5V rail in body electronics where input never drops below 4.5V; lacks cold-crank capability below 3.3V.	Choose for space-constrained 3.3V systems with stable input; avoid in engine-bay applications with wide VIN variation.

Compared with LM61480-Q1 and TPS62130A-Q1, MPQ2451DT-AEC1-LF-P offers optimal balance of AEC-Q100 compliance, ultra-low IQ, and SOT23-6L footprint for sub-0.6A automotive loads - making it ideal for cost-sensitive, thermally constrained nodes where simplicity and qualification rigor outweigh raw power density.

Availability

MPQ2451DT-AEC1-LF-P is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and industrial PLC I/O modules requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.

Supply support for MPQ2451DT-AEC1-LF-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 manufacturing partners certified to ISO/TS 16949.

The MPQ2451 belongs to MPS's automotive-grade DC/DC converter product line, engineered specifically for harsh-environment power conversion in engine control, safety, and connectivity systems - emphasizing AEC-Q100 reliability, wide-input tolerance, and minimal external component count.

FAQ

What is the maximum recommended output current for MPQ2451DT-AEC1-LF-P in SOT23-6L package at 85°C ambient?

The SOT23-6L package has θ_JA = 220°C/W. At 85°C ambient and 125°C max junction temperature, allowable power dissipation is 182mW. With 500mΩ R_DS(on), this limits continuous output current to approximately 0.43A - consistent with derating curves in the datasheet Figure 11. For 0.6A full-load operation, thermal relief (copper pour, airflow) or QFN-6L package is advised.

Can MPQ2451DT-AEC1-LF-P be used with a 3.3V fixed output configuration?

No - MPQ2451DT-AEC1-LF-P is the base part number for the adjustable version (0.8V–0.9×VIN). For fixed 3.3V output, the correct orderable part is MPQ2451GT-33-AEC1 (SOT23-6L) or MPQ2451GG-33-AEC1 (QFN-6L), which integrate internal feedback resistors and have top marking AGF or BQ respectively.

Does MPQ2451DT-AEC1-LF-P require an external bootstrap diode?

An external bootstrap diode is optional but recommended for high-duty-cycle applications (V_OUT/V_IN > 65%) or when VIN ≤ 5V. In standard 12V→5V operation, the internal bootstrap regulator adequately charges the BST capacitor. If added, BAT54 or IN4148 placed from 5V rail to BST pin improves efficiency by ~1–2% under heavy load.

How does the MPQ2451 handle short-circuit conditions?

During output short, the current-limit circuit triggers cycle-by-cycle, clamping peak inductor current to ~0.9A (typical). The device enters hiccup mode after repeated faults - shutting down for ~2ms before retrying - preventing thermal damage while allowing automatic recovery once fault clears, as verified in datasheet Figure 12 waveforms.

Is the FB pin internally pulled up or down when left unconnected?

The FB pin has no internal pull-up or pull-down; it is a high-impedance input to the error amplifier. Leaving it unconnected causes undefined regulation and potential oscillation. A valid resistive divider (e.g., 23.7kΩ + 124kΩ for 5V) must be connected between V_OUT and GND, with FB tied to the midpoint - per datasheet Section "Setting the Output Voltage".

What is the minimum recommended input capacitance for stable operation at 36V input?

At 36V input and 0.6A load, a minimum 4.7µF X7R ceramic capacitor is required close to VIN and GND pins. For improved surge immunity, add a 10µF tantalum or polymer capacitor in parallel. Total effective capacitance must maintain <100mV p-p ripple at 2MHz switching frequency - verified by Equation 10 in the datasheet Application Information section.

Does MPQ2451DT-AEC1-LF-P support forced PWM mode to eliminate audible noise?

No - MPQ2451DT-AEC1-LF-P only supports automatic transition between fixed-frequency PWM and pulse-skipping modes. It lacks a MODE pin or external control to force continuous PWM at light load. For noise-sensitive applications, select MPQ2451DG-AEC1 with external compensation or consider MPS's pin-compatible MPQ4420A with forced PWM option.

MPQ2451DT-AEC1-LF-P Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: SOT-23-6

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 3.3V

Voltage - Input (Max):: 36V

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

Voltage - Output (Max):: 32.4V

Current - Output:: 600mA

Frequency - Switching:: 2MHz

Synchronous Rectifier:: No

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

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-6L

MPQ2451DT-AEC1-LF-P FAQ

1.How can I place an order for MPQ2451DT-AEC1-LF-P through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ2451DT-AEC1-LF-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 MPQ2451DT-AEC1-LF-P reliable?

The price and inventory of MPQ2451DT-AEC1-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ2451DT-AEC1-LF-P is usually 5 days.

3.What payment methods are accepted for MPQ2451DT-AEC1-LF-P?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2451DT-AEC1-LF-P transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ2451DT-AEC1-LF-P?

MPQ2451DT-AEC1-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ2451DT-AEC1-LF-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 MPQ2451DT-AEC1-LF-P?

For technical support, including MPQ2451DT-AEC1-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2451DT-AEC1-LF-P requirements.

6.How does Aetrix verify that MPQ2451DT-AEC1-LF-P is sourced from the original manufacturer or authorized distributors?

All MPQ2451DT-AEC1-LF-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 MPQ2451DT-AEC1-LF-P meets industry standards.

7.What is the process for return or replacement of MPQ2451DT-AEC1-LF-P?

All MPQ2451DT-AEC1-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2451DT-AEC1-LF-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 MPQ2451DT-AEC1-LF-P part is unused and in its original packaging.

Return procedure for MPQ2451DT-AEC1-LF-P:

1.Submit a request within 90 days.

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

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