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Monolithic Power Systems Inc. MPQ2451GT-33-Z
- Part No.:
- MPQ2451GT-33-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6
- Datasheet:
-
MPQ2451GT-33-Z.pdf
- Description:
- IC REG BUCK 3.3V 600MA SOT23-6L
- Quantity:
- Payment:
- Shipping:
Inventory:1,468
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Product details
Overview
MPQ2451GT-33-Z from Monolithic Power Systems is a 36V-input, 3.3V-output, 0.6A asynchronous step-down DC/DC converter with integrated 500mΩ high-side MOSFET, 2.2MHz fixed switching frequency, AEC-Q100 Grade 1 qualification, and 130µA quiescent current - designed for automotive power rails requiring stable low-noise 3.3V supply under wide input transients.
For engineers reviewing the MPQ2451GT-33-Z datasheet, MPQ2451GT-33-Z pinout, MPQ2451GT-33-Z application, or MPQ2451GT-33-Z equivalent, this device supports battery-powered automotive subsystems, meets stringent thermal and EMI constraints in space-constrained ECUs, and delivers >90% efficiency across 1mA–600mA load range without external compensation.
Technical Context
The MPQ2451GT-33-Z implements peak-current-mode control with internal soft-start and frequency fold-back during start-up to prevent inductor current runaway. Its current-limit threshold is precision-set at 0.75A (typ) without external sense resistors, enabling accurate overcurrent protection in safety-critical automotive modules.
It operates in fixed-frequency PWM mode at full load and transitions to pulse-skipping mode under light loads (<10mA), reducing quiescent current to 1µA in shutdown and maintaining 3.3V output regulation across −40°C to +125°C junction temperature with internal thermal shutdown at 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 36V - accommodates cold-crank (4.5V) and load-dump (36V) conditions in 12V automotive systems. |
| Output Voltage | 3.3V ±3.6% (3.168V–3.432V) - tight tolerance enables direct powering of MCU I/O and CAN transceivers without post-regulation. |
| Switching Frequency | 2.2MHz (±18%) - enables use of compact 2.2–3.3µH inductors and avoids AM radio band interference. |
| Max Output Current | 0.6A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in body control modules. |
| Quiescent Current | 130µA (typ) - extends battery life in always-on vehicle subsystems such as door modules and occupancy sensors. |
| Internal MOSFET RDS(ON) | 500mΩ - minimizes conduction loss at 0.6A, supporting >90% efficiency at 12VIN/3.3VOUT with 3.3µH inductor. |
| Shutdown Current | 1µA - ensures negligible drain on vehicle battery during ignition-off states. |
Pinout & Package
MPQ2451GT-33-Z is packaged in SOT23-6L - a thermally enhanced, surface-mount package with exposed pad for improved heat dissipation in automotive environments. Pin mapping is validated per MPS datasheet Rev 1.0 (2016).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | Bootstrap Supply | Provides floating gate drive voltage for high-side MOSFET; requires 100nF ceramic capacitor between BST and SW to sustain 5V gate drive during high-duty-cycle operation. |
| GND (Pin 2) | Power Ground | Primary return path for output capacitor and internal regulator; must be connected directly to PCB ground plane with minimal trace length to reduce noise coupling. |
| OUT (Pin 3) | Feedback Sense | Connects to internal resistor divider tap; sets regulated 3.3V output - no external resistors required. |
| EN (Pin 4) | Enable Control | Logic-high (>1.35V) enables regulation; logic-low (<0.3V) reduces supply current to 1µA; floating disables device via internal pull-down. |
| VIN (Pin 5) | Main Input Supply | Accepts 3.3–36V input; requires local 10µF ceramic decoupling capacitor to suppress switching noise and stabilize internal 2.6V regulator. |
| SW (Pin 6) | Switch Node | Drives external Schottky catch diode (e.g., BAT54); high dv/dt node requiring shortest possible trace to minimize EMI and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualified | Validated for −40°C to +125°C operation - suitable for engine bay and front-end electronics without derating. |
| Internally compensated | Eliminates need for external compensation network - reduces BOM count and layout sensitivity in cost-sensitive automotive modules. |
| Stable with ceramic output capacitors | Supports low-ESR 22µF X5R/X7R ceramics - avoids bulkier tantalum/electrolytic caps and improves reliability in thermal cycling environments. |
| Precision cycle-by-cycle current limit | 0.75A typical limit without sense resistor - enables robust short-circuit protection in infotainment and ADAS camera power supplies. |
| Frequency fold-back at start-up | Prevents inductor saturation during VIN ramp-up - critical for reliable cold-start behavior in battery-supplied telematics units. |
Applications
| Automotive Body Control Module (BCM) | Automotive Infotainment Power Rail |
|---|---|
|
Use Scenario: Powers 3.3V I/O and CAN FD transceivers in door module ECUs subjected to 4.5–16V battery fluctuations and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator delivering regulated supply with <100ns response to load transients from window motor actuation. Use Value: 130µA quiescent current prevents parasitic drain during vehicle sleep mode; AEC-Q100 qualification ensures 15-year field reliability. |
Use Scenario: Supplies 3.3V core voltage to ARM-based infotainment SoC during ignition-on, with transient immunity to load-dump events up to 36V. IC Role / Device Role / Timing Role: High-frequency (2.2MHz) step-down converter enabling compact 2.2µH inductor placement near SoC, minimizing board area. Use Value: Internal soft-start limits inrush current to <100mA during cold boot; 500mΩ MOSFET sustains >88% efficiency at 500mA load. |
| Automotive Occupancy Detection Sensor | Automotive Telematics Control Unit (TCU) |
|
Use Scenario: Powers MEMS-based seat occupancy sensor and its signal-conditioning ADC in low-power always-on mode. IC Role / Device Role / Timing Role: Ultra-low-IQ DC/DC converter maintaining 3.3V rail while drawing only 130µA from 12V battery during vehicle sleep. Use Value: Pulse-skipping mode maintains regulation down to 1mA load; thermal shutdown protects against enclosure overheating in sealed cabin modules. |
Use Scenario: Generates 3.3V supply for LTE modem, GNSS receiver, and cellular baseband processor in TCU operating across −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Automotive-grade synchronous-capable buck converter (with external diode) delivering stable 3.3V under GSM burst current demands. Use Value: 2.2MHz switching allows filtering with small 1µF ceramic caps; EN pin enables firmware-controlled power sequencing with 400mV hysteresis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3.3V automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ2451GG-33-AEC1 | Same silicon, QFN-6L (2mm×2mm) package with exposed thermal pad - θJA = 80°C/W vs. SOT23-6L's 220°C/W. | Better thermal performance in high-ambient-density ECUs; requires reflow-compatible land pattern and thermal vias. | Select when board-level thermal resistance exceeds 100°C/W or ambient exceeds 85°C. |
| TI LM61480-Q1 | 4.5–36V input, 3.3V/3A output, 2.1MHz, integrated high/low-side FETs - higher current, lower RDS(ON), but larger QFN-16 package. | Supports higher-power domains (e.g., radar preprocessing); lacks pin-to-pin compatibility and requires external compensation. | Choose when >0.6A output or synchronous rectification is required; not drop-in compatible. |
Compared with MPQ2451GT-33-Z, the QFN variant offers superior thermal management for sustained 0.6A loads, while the LM61480-Q1 provides higher current headroom at the cost of increased footprint and design complexity - making MPQ2451GT-33-Z optimal for space- and cost-constrained 0.6A automotive subsystems.
Availability
MPQ2451GT-33-Z is available at Aetrix Electronics and suitable for automotive body control modules, infotainment power rails, and telematics control units requiring stable component supply with AEC-Q100 compliance and long-term production continuity.
Supply support for MPQ2451GT-33-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 in the US, China, and Taiwan, and global manufacturing partnerships.
The MPQ2451 product line delivers AEC-Q100-qualified DC/DC converters optimized for automotive subsystems demanding high input voltage tolerance, ultra-low quiescent current, and compact footprint - targeting body electronics, ADAS sensors, and infotainment power management.
FAQ
What is the minimum input voltage required for MPQ2451GT-33-Z to regulate 3.3V output?
The device requires a minimum input voltage of 3.3V to maintain regulation, as specified in the Recommended Operating Conditions table. Below 3.3V, UVLO activates and disables switching; the rising UVLO threshold is 2.7V, but stable 3.3V output is only guaranteed above 3.3V input due to dropout constraints of the internal high-side MOSFET and driver.
Can MPQ2451GT-33-Z operate without an external bootstrap capacitor?
No - the BST pin requires a 100nF ceramic capacitor connected between BST and SW to charge the floating gate driver. Omitting it causes insufficient gate voltage on the high-side MOSFET, resulting in erratic switching, excessive heating, and failure to regulate. This capacitor must be placed within 2mm of the IC pins per layout guidelines.
Is MPQ2451GT-33-Z pin-compatible with MPQ2451GT-5-Z?
Yes - both share identical SOT23-6L pinout, electrical characteristics, and functional block diagram. The only difference is the internally trimmed output voltage: 3.3V for MPQ2451GT-33-Z and 5V for MPQ2451GT-5-Z. No PCB redesign is needed when swapping between them for different system voltage requirements.
Does MPQ2451GT-33-Z require external compensation components?
No - the device is internally compensated, as confirmed in the FEATURES section and Functional Block Diagram. It achieves stable operation with only input/output capacitors and an inductor. Adding external compensation components will destabilize the control loop and is explicitly discouraged in the datasheet.
What is the maximum allowable duty cycle for reliable bootstrap charging?
Reliable bootstrap charging requires (VIN − VOUT) > 3V, as stated in the External Bootstrap Diode section. At 3.3V output, this means VIN must exceed 6.3V. For VIN ≤ 6V or duty cycles >65%, an external 5V-fed bootstrap diode (e.g., BAT54) is mandatory to maintain BST voltage above 2.4V UVLO threshold.
How does thermal shutdown behave during sustained overload?
When junction temperature exceeds 150°C, thermal shutdown disables the high-side MOSFET and pulls COMP low, halting switching. Recovery occurs only after die temperature falls below ~135°C (hysteresis ~15°C), preventing rapid cycling. During shutdown, EN and UVLO remain active, allowing external logic to detect fault conditions.
Is the 3.3V output voltage trimmed at final test?
Yes - the 3.3V output is factory-trimmed to ±3.6% (3.168V–3.432V) across temperature and line/load conditions, as verified in the ELECTRICAL CHARACTERISTICS table. This eliminates need for external feedback resistors and ensures accuracy without calibration in production.
MPQ2451GT-33-Z 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):
- 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:
- SOT-23-6L
MPQ2451GT-33-Z FAQ
1.How can I place an order for MPQ2451GT-33-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ2451GT-33-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 MPQ2451GT-33-Z reliable?
The price and inventory of MPQ2451GT-33-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ2451GT-33-Z is usually 5 days.
3.What payment methods are accepted for MPQ2451GT-33-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2451GT-33-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ2451GT-33-Z?
MPQ2451GT-33-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ2451GT-33-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 MPQ2451GT-33-Z?
For technical support, including MPQ2451GT-33-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2451GT-33-Z requirements.
6.How does Aetrix verify that MPQ2451GT-33-Z is sourced from the original manufacturer or authorized distributors?
All MPQ2451GT-33-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 MPQ2451GT-33-Z meets industry standards.
7.What is the process for return or replacement of MPQ2451GT-33-Z?
All MPQ2451GT-33-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2451GT-33-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 MPQ2451GT-33-Z part is unused and in its original packaging.
Return procedure for MPQ2451GT-33-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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