My Inquiry
My Account
Monolithic Power Systems Inc. MPQ2451GT-5-Z
- Part No.:
- MPQ2451GT-5-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- SOT-23-6
- Datasheet:
-
MPQ2451GT-5-Z.pdf
- Description:
- IC REG BUCK 5V 600MA SOT23-6L
- Quantity:
- Payment:
- Shipping:
Inventory:4,013
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MPQ2451GT-5-Z from Monolithic Power Systems is a 36V, 2.2MHz, 0.6A asynchronous step-down converter with integrated high-side MOSFET (RDS(ON) = 500mΩ), fixed 5V output, AEC-Q100 Grade 1 qualification, and 130µA quiescent current-designed for automotive power rails supplying infotainment, ADAS sensors, and body control modules.
For engineers reviewing the MPQ2451GT-5-Z datasheet, MPQ2451GT-5-Z pinout, MPQ2451GT-5-Z application, or MPQ2451GT-5-Z equivalent, this device delivers precision current-limit protection without external sense resistors, internal compensation for ceramic-capacitor stability, and pulse-skipping mode for battery-backed systems requiring <3µA shutdown current.
Technical Context
The MPQ2451GT-5-Z implements peak-current-mode control with a fixed 2.2MHz oscillator and internal soft-start (0.5–1ms ramp), enabling fast transient response in automotive 12V/24V systems. Its current-sense MOSFET enables cycle-by-cycle overcurrent protection at 0.75–1A, independent of external components.
It features an integrated bootstrap regulator that charges the BST capacitor to ~5V via VIN–SW path, with dedicated UVLO (2.4V rising) on the floating driver. Thermal shutdown activates at 150°C, and input UVLO has 2.9V rising / 2.6V falling thresholds with 0.4V hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±2% (4.8–5.2V), internally trimmed-eliminates external feedback resistor network. |
| Input Voltage Range | 3.3V to 36V-supports cold-crank (4.5V) and load-dump (36V) transients in automotive applications. |
| Switching Frequency | 2.2MHz ±20%-enables compact 2.2–3.3µH inductors and reduces EMI above AM band. |
| Max Output Current | 0.6A continuous-limited by thermal design (SOT23-6L θJA = 220°C/W, PD(MAX) = 0.57W @ 25°C). |
| Quiescent Current | 130µA typical at no load-enables >1-year battery life in always-on vehicle modules. |
| Shutdown Current | 1µA max-achieved by disabling internal regulator and gate drivers when EN < 0.3V. |
| Current Limit | 0.75–1A cycle-by-cycle-precision internal sensing avoids external RSENSE, reducing BOM cost and board space. |
Pinout & Package
MPQ2451GT-5-Z is housed in a thermally enhanced SOT23-6L package (2.9mm × 2.8mm × 1.3mm) with exposed pad for improved heat dissipation. Pin 1 is marked with a dot; pin numbering follows standard SOT23-6L orientation (pin 1 = BST, pin 2 = GND, pin 3 = OUT, pin 4 = EN, pin 5 = VIN, pin 6 = SW).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | Bootstrap supply for high-side driver | Requires 100nF ceramic capacitor to SW; enables gate drive voltage ≥5V for MOSFET turn-on under high duty cycles. |
| GND (Pin 2) | Power ground reference | Must connect output capacitor directly here; routing near SW or high-di/dt paths causes instability. |
| OUT (Pin 3) | Feedback node for internal 5V regulation | Internally connected to 5V divider tap-no external resistors needed; sets output precisely to 5V. |
| EN (Pin 4) | Enable/disable control input | Logic-high threshold 1.35–1.8V; floating = disabled; supports programmable UVLO by biasing with VOUT+3V. |
| VIN (Pin 5) | Main input supply rail | Accepts 3.3–36V; requires local 10µF ceramic decoupling; powers internal 2.6V regulator and gate drivers. |
| SW (Pin 6) | High-side switch node | Drives external Schottky diode (or sync FET); high dv/dt demands short, low-inductance PCB trace to minimize ringing. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Rated for −40°C to +125°C junction operation-validated for automotive engine bay and cabin electronics. |
| Internal soft-start (0.5–1ms) | Prevents output overshoot during cold-start; ramps COMP voltage linearly to avoid inrush into downstream LDOs or MCUs. |
| Stable with ceramic output capacitors | No external compensation required-reduces component count and improves reliability vs. electrolytic/tantalum alternatives. |
| Precision current limit (no sense resistor) | Uses matched current-sense MOSFET-avoids 5–10% tolerance drift and temperature coefficient errors of discrete resistors. |
| Frequency fold-back at light load | Reduces switching losses below 10% load-maintains >85% efficiency down to 10mA while suppressing audible noise. |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
|
Use Scenario: Powers USB-C hub, display controller, and audio codec in center-stack head unit with 12V battery input subject to load dump. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering stable rail under 4.5–16V cold-crank and 36V load-dump conditions. Use Value: AEC-Q100 qualification ensures functional safety compliance; 2.2MHz switching avoids interference with AM/FM radio bands. |
Use Scenario: Supplies image sensor, ISP, and MIPI interface in rear-view camera module mounted in bumper. IC Role / Device Role / Timing Role: Always-on 5V source with ultra-low quiescent current (<130µA) to preserve battery during vehicle sleep mode. Use Value: 1µA shutdown current extends parked vehicle battery life beyond 12 months; thermal shutdown prevents field failure in sealed enclosures. |
| Body Control Unit (BCU) Sub-Rail | Telematics Control Unit (TCU) Core Supply |
|
Use Scenario: Generates 5V for microcontroller, CAN transceiver, and door-lock actuator drivers in centralized BCU. IC Role / Device Role / Timing Role: High-efficiency intermediate rail converting 24V truck battery to MCU-compatible 5V with minimal heatsink requirement. Use Value: 500mΩ RDS(ON) and pulse-skipping mode deliver >90% efficiency at 100mA–600mA loads-reducing thermal stress in confined chassis space. |
Use Scenario: Provides clean 5V core power to LTE modem, GNSS receiver, and secure element in cellular-connected TCU. IC Role / Device Role / Timing Role: Low-noise, internally compensated buck converter minimizing conducted EMI into sensitive RF front-end circuits. Use Value: Fixed-frequency operation and ceramic-capacitor compatibility suppress ripple to <20mVPP, preventing data corruption in high-speed serial links. |
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-Z | Fixed 3.3V output (vs. 5V); identical pinout, specs, and AEC-Q100 qualification | Direct substitute where system requires 3.3V logic rail instead of 5V-no layout change needed | Select when powering 3.3V microcontrollers, FPGAs, or digital sensors without post-regulation. |
| MPQ4420AGJ-AEC1-Z | 2A output, 36V input, 500kHz switching, QFN-10 package-higher current, lower frequency, larger footprint | Suitable for higher-power domains (e.g., HVAC control, lighting drivers) but requires redesign of layout and magnetics | Choose only if >0.6A sustained load exists; not drop-in due to different pin count, frequency, and thermal profile. |
Compared with MPQ2451GT-33-Z, the MPQ2451GT-5-Z provides higher output voltage for legacy 5V peripherals; versus MPQ4420AGJ-AEC1-Z, it offers smaller size and higher frequency for space-constrained modules, but cannot support >0.6A loads without derating.
Availability
MPQ2451GT-5-Z is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MPQ2451GT-5-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.
The MPQ2451 product line targets automotive-grade DC/DC conversion, emphasizing AEC-Q100 reliability, wide-input operation, and integration to reduce external component count in harsh environments.
FAQ
What is the maximum recommended PCB temperature rise for MPQ2451GT-5-Z in SOT23-6L package?
The SOT23-6L package has θJA = 220°C/W. At 0.6A output and 12V input, typical power dissipation is ~0.3W. With 25°C ambient, junction temperature reaches ~91°C-well below the 125°C max operating TJ. Maintain ≥4 thermal vias under the exposed pad and use ≥1oz copper on inner layers to keep case temperature ≤65°C.
Can MPQ2451GT-5-Z operate with input voltage below 3.3V?
No. The absolute minimum operating input voltage is 3.3V per datasheet specifications. Below this, the internal 2.6V regulator cannot sustain full functionality, and UVLO (rising threshold 2.9V) forces shutdown. It is not rated for 2.5V or 3.0V brown-out operation.
Is an external Schottky diode mandatory for MPQ2451GT-5-Z?
Yes. As an asynchronous buck converter, MPQ2451GT-5-Z requires an external Schottky diode (e.g., SS14, BAT54) from SW to GND to provide freewheeling current path. Omitting it causes catastrophic failure due to lack of current recirculation during MOSFET off-time.
How does the internal current limit behave across temperature?
The current limit is specified as 0.75–1A at 25°C and 0.65–1A from −40°C to +125°C. It decreases slightly at high temperature due to MOSFET RDS(ON) increase, providing inherent thermal derating-no external adjustment needed.
Does MPQ2451GT-5-Z support forced PWM mode?
No. It operates exclusively in peak-current-mode PWM at full frequency under medium-to-heavy loads, and automatically transitions to pulse-skipping mode under light load. There is no pin or register to force continuous conduction mode.
What is the minimum recommended BST capacitor value and type?
A 100nF X7R ceramic capacitor placed between BST and SW is mandatory. It must be located within 2mm of the pins with short, wide traces. Larger values (e.g., 220nF) do not improve performance and may slow bootstrap charging during high-duty-cycle operation.
Can the EN pin be used to implement input undervoltage lockout at a custom threshold?
Yes. By connecting a resistor divider from VIN to EN, the effective UVLO threshold becomes VEN(HI) × (R1 + R2)/R2. For example, using R1 = 100kΩ and R2 = 20kΩ sets UVLO to ~6V, protecting downstream circuits during battery sag.
MPQ2451GT-5-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):
- 5V
- 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-5-Z FAQ
1.How can I place an order for MPQ2451GT-5-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ2451GT-5-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-5-Z reliable?
The price and inventory of MPQ2451GT-5-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-5-Z is usually 5 days.
3.What payment methods are accepted for MPQ2451GT-5-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2451GT-5-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ2451GT-5-Z?
MPQ2451GT-5-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ2451GT-5-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-5-Z?
For technical support, including MPQ2451GT-5-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2451GT-5-Z requirements.
6.How does Aetrix verify that MPQ2451GT-5-Z is sourced from the original manufacturer or authorized distributors?
All MPQ2451GT-5-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-5-Z meets industry standards.
7.What is the process for return or replacement of MPQ2451GT-5-Z?
All MPQ2451GT-5-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2451GT-5-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-5-Z part is unused and in its original packaging.
Return procedure for MPQ2451GT-5-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPQ2451GT-5-Z Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
