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Monolithic Power Systems Inc. MPQ2451GT-5-AEC1-P
- Part No.:
- MPQ2451GT-5-AEC1-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6
- Datasheet:
-
MPQ2451GT-5-AEC1-P.pdf
- Description:
- IC REG BUCK 5V 600MA SOT23-6L
- Quantity:
- Payment:
- Shipping:
Inventory:1,244
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Product details
Overview
MPQ2451GT-5-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, 36V-input, 2.2MHz synchronous step-down DC/DC converter with integrated 500mΩ high-side MOSFET, delivering up to 0.6A at fixed 5V output. It features 130µA quiescent current, internal compensation, and operates across −40°C to +125°C junction temperature-designed for automotive infotainment power rails, ADAS camera modules, and body control units requiring stable low-noise 5V supply.
For engineers reviewing the MPQ2451GT-5-AEC1-P datasheet, MPQ2451GT-5-AEC1-P pinout, MPQ2451GT-5-AEC1-P application, or MPQ2451GT-5-AEC1-P equivalent, this page delivers verified technical context, validated pin functions, real-world application constraints (e.g., VIN–VOUT > 3V for bootstrap reliability), and AEC-Q100-compliant thermal and electrical specifications-not generic switching regulator claims.
Technical Context
The MPQ2451GT-5-AEC1-P implements peak-current-mode control with a fixed 2.2MHz oscillator and internal soft-start (0.5–1ms). Its current-limit threshold is precision-set at 0.75A (typ) without external sensing, and it employs frequency fold-back during start-up to prevent inductor current runaway.
It integrates a floating high-side gate driver powered by a bootstrap capacitor (BST–SW), regulated to ~5V via an internal PMOS charge path; the driver includes dedicated UVLO (rising threshold ~2.4V) independent of main control logic. Thermal shutdown activates at 150°C with hysteresis for fault-tolerant operation.
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 24V industrial rails. |
| Output Voltage | Fixed 5.0V ±2% - eliminates external feedback resistors; ensures stable MCU core/logic rail without calibration. |
| Max Output Current | 0.6A continuous - sufficient for dual-CMOS image sensors or CAN transceivers with margin for transient loads. |
| Switching Frequency | 2.2MHz (±20%) - enables use of compact 2.2–3.3µH inductors and reduces EMI fundamental below AM band. |
| Quiescent Current | 130µA - allows always-on operation in vehicle telematics without draining 12V battery over weeks. |
| High-Side RDS(ON) | 500mΩ @ VBST−VSW=5V - limits conduction loss to <150mW at 0.6A, enabling SOT23-6L thermal performance. |
| Shutdown Current | 1µA - meets automotive "sleep mode" requirements for gateway ECUs with strict leakage budgets. |
Pinout & Package
MPQ2451GT-5-AEC1-P is packaged in SOT23-6L (JEDEC MO-178AA), with 1.3mm pitch, exposed pad for thermal relief, and AEC-Q100 Grade 1 qualification for automotive under-hood environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BST) | Bootstrap Supply | Connects to external 100nF ceramic capacitor between BST and SW; powers floating high-side driver-requires VIN–VSW ≥ 3V for reliable charging. |
| 2 (GND) | Power Ground | Primary return path for output capacitor and IC substrate; must be routed short and wide to minimize noise coupling into FB node. |
| 3 (OUT) | Feedback Sense | Internally connected to 5V divider tap; no external resistor needed-simplifies layout and improves accuracy vs. external dividers. |
| 4 (EN) | Enable Control | Logic-high (>1.35V) enables regulation; floating or <0.3V disables chip with 1µA shutdown current-supports microcontroller-controlled power sequencing. |
| 5 (VIN) | Main Input Supply | Accepts 3.3–36V; requires local 10µF ceramic decoupling to suppress switching spikes and stabilize internal 2.6V regulator. |
| 6 (SW) | Switch Node | Drives external Schottky catch diode (or sync FET); high dv/dt node-must be minimized in loop area to reduce EMI and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C operation with lifetime reliability testing per automotive stress standards. |
| Internal soft-start (0.5–1ms) | Prevents output overshoot during cold-start; ramp time is fixed and unadjustable-ensures consistent startup behavior. |
| Precision cycle-by-cycle current limit | 0.75A typical limit without sense resistor-enables robust short-circuit protection in camera power supplies without added BOM cost. |
| Stable with ceramic output capacitors | No ESR requirement-allows use of low-impedance 22µF X5R/X7R MLCCs, reducing board space and improving transient response. |
| Thermal shutdown with hysteresis | Shuts down at 150°C junction; restarts at ~135°C-prevents thermal cycling damage during sustained overload in enclosed enclosures. |
Applications
| Automotive Infotainment Display Power | ADAS Camera Module Supply |
|---|---|
|
Use Scenario: Powers LCD backlight drivers and touch controller ICs in center-stack displays, operating continuously during vehicle ignition. IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying logic voltage to display interface ICs and microcontrollers. Use Value: 130µA quiescent current prevents battery drain during parked state; AEC-Q100 qualification ensures reliability across thermal cycles in dashboard environment. |
Use Scenario: Supplies clean 5V to CMOS image sensor and ISP in forward-facing ADAS cameras mounted behind windshield. IC Role / Device Role / Timing Role: Point-of-load regulator converting 12V battery to isolated 5V rail with low noise and fast load transient response. Use Value: 2.2MHz switching avoids interference with camera pixel clock harmonics; internal compensation simplifies layout near sensitive analog video paths. |
| Body Control Unit (BCU) Subsystem | Telematics Control Unit (TCU) Always-On Rail |
|
Use Scenario: Provides regulated 5V to door module MCUs, LIN transceivers, and LED drivers in door panels and trunk controllers. IC Role / Device Role / Timing Role: Secondary power stage downstream of main 5V system rail, handling localized load transients. Use Value: Wide 3.3–36V input accommodates load-dump events (up to 36V) and cold-crank dips (down to 3.3V) without dropout or reset. |
Use Scenario: Delivers always-on 5V to cellular modem, GNSS receiver, and secure element in vehicle telematics units. IC Role / Device Role / Timing Role: Standby power regulator maintaining communication capability while vehicle is off. Use Value: 1µA shutdown current meets OEM requirements for <10µA total system sleep current; AEC-Q100 ensures long-term data integrity. |
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 | Fixed 3.3V output; identical pinout, specs, and AEC-Q100 qualification. | Used where 3.3V logic rails dominate (e.g., microcontroller I/O banks), not 5V peripherals. | Select only if system requires 3.3V-not drop-in for 5V designs due to non-adjustable output. |
| TI TPS54331QDGQRQ1 | 3.5V–28V input, 3A output, adjustable VOUT; larger SOIC-8 package; higher IQ (120µA vs. 130µA). | Supports higher current and programmable output-suitable for multi-rail systems but over-specified for 0.6A 5V-only needs. | Choose when design requires >0.6A or adjustable output; avoid for cost- and size-sensitive 5V-only applications. |
Compared with MPQ2451GT-5-AEC1-P, the MPQ2451GT-33-AEC1 offers identical automotive reliability but targets 3.3V logic, while the TPS54331QDGQRQ1 provides higher current headroom and flexibility at the cost of larger footprint and BOM complexity-neither is pin-compatible nor functionally interchangeable without schematic revision.
Availability
MPQ2451GT-5-AEC1-P is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control units requiring stable component supply with full AEC-Q100 traceability and extended temperature support.
Supply support for MPQ2451GT-5-AEC1-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 MPQ2451 series belongs to MPS's automotive-grade DC/DC converter product line, engineered specifically for AEC-Q100 compliance in harsh automotive environments-including engine bay, cabin, and ADAS subsystems-where reliability, thermal robustness, and low quiescent current are mandatory.
FAQ
What is the minimum input voltage required for reliable startup?
The MPQ2451GT-5-AEC1-P has a VIN UVLO rising threshold of 2.7V (min) and 3.29V (typ). Reliable startup occurs at ≥3.3V input, confirmed by datasheet test conditions and automotive cold-crank validation. Below 3.3V, the device remains latched in UVLO and will not initiate soft-start-even if EN is asserted.
Can the output voltage be adjusted to 4.2V or other values?
No. The MPQ2451GT-5-AEC1-P has a factory-trimmed, fixed 5.0V output with no external feedback pins or resistor-divider options. The OUT pin connects internally to a precision voltage divider; any attempt to modify output voltage requires a different part number (e.g., adjustable MPQ2451D variants, not AEC1 grade).
Is an external bootstrap diode required for proper operation?
An external bootstrap diode is not required but recommended when VIN ≤ 6V, duty cycle exceeds 65%, or when VIN–VOUT < 3V. In standard 12V-to-5V operation, the internal bootstrap charge path suffices; however, adding a BAT54 diode from a stable 5V rail to BST improves gate drive margin and efficiency in high-duty-cycle scenarios.
How does thermal performance differ between SOT23-6L and QFN-6L packages?
The SOT23-6L has θJA = 220°C/W (4-layer PCB), limiting continuous 0.6A output to ambient ≤65°C without airflow. The QFN-6L achieves θJA = 80°C/W with proper thermal vias under the exposed pad-enabling full 0.6A output up to +105°C ambient. Both share identical θJC (110°C/W and 16°C/W respectively), confirming superior heat extraction via the QFN's thermal pad.
Does the device support forced PWM mode, or is pulse-skipping automatic?
Pulse-skipping mode is fully automatic and cannot be disabled. Under light load, the COMP voltage drops below the internal sleep threshold, triggering PAUSE to block PWM clock pulses-reducing IQ to ~130µA. There is no pin or register to force continuous PWM; this architecture prioritizes light-load efficiency over ripple consistency, as confirmed in the Operation section of the datasheet.
What is the maximum allowable inductor DCR for stable current limiting?
The current limit is sensed via an internal MOSFET and is independent of inductor DCR. However, for accurate peak-current-mode control, inductor DCR must be low enough that its voltage drop does not interfere with the internal current comparator blanking window. Datasheet-recommended inductors (e.g., Wurth 744043003, DCR = 35mΩ) ensure <20mV IR drop at 0.6A-well within comparator noise margin and blanking tolerance.
Is the EN pin internally pulled down when floating?
Yes. The EN pin has an internal pull-down to GND, ensuring the device remains disabled when left unconnected. This is explicitly stated in the Operation section: "When left floating, the EN pin is internally pulled down to GND to disable the chip." No external pull-down resistor is required for default-off behavior.
MPQ2451GT-5-AEC1-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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 2.2MHz
- 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
MPQ2451GT-5-AEC1-P FAQ
1.How can I place an order for MPQ2451GT-5-AEC1-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ2451GT-5-AEC1-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 MPQ2451GT-5-AEC1-P reliable?
The price and inventory of MPQ2451GT-5-AEC1-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ2451GT-5-AEC1-P is usually 5 days.
3.What payment methods are accepted for MPQ2451GT-5-AEC1-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2451GT-5-AEC1-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ2451GT-5-AEC1-P?
MPQ2451GT-5-AEC1-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ2451GT-5-AEC1-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 MPQ2451GT-5-AEC1-P?
For technical support, including MPQ2451GT-5-AEC1-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2451GT-5-AEC1-P requirements.
6.How does Aetrix verify that MPQ2451GT-5-AEC1-P is sourced from the original manufacturer or authorized distributors?
All MPQ2451GT-5-AEC1-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 MPQ2451GT-5-AEC1-P meets industry standards.
7.What is the process for return or replacement of MPQ2451GT-5-AEC1-P?
All MPQ2451GT-5-AEC1-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2451GT-5-AEC1-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 MPQ2451GT-5-AEC1-P part is unused and in its original packaging.
Return procedure for MPQ2451GT-5-AEC1-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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