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Monolithic Power Systems Inc. MPQ4456GQT-Z
- Part No.:
- MPQ4456GQT-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MPQ4456GQT-Z.pdf
- Description:
- IC REG BUCK ADJ 1A 10TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,664
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Product details
Overview
MPQ4456GQT-Z from Monolithic Power Systems is an industrial-grade, non-synchronous step-down DC/DC converter with integrated 300mΩ high-side MOSFET, delivering 1A output current across a 3.8V–36V input range. It operates at up to 4MHz switching frequency, features 120µA quiescent current, and maintains PWM operation down to light loads for low-noise performance in automotive and industrial power rails.
For engineers reviewing the MPQ4456GQT-Z datasheet, MPQ4456GQT-Z pinout, MPQ4456GQT-Z application, or MPQ4456GQT-Z equivalent, key selection criteria include its programmable 4MHz frequency, 0.8V feedback reference, internal soft-start, extended PWM mode for EMI-sensitive designs (e.g., AM radio band), and TQFN-10 (3mm × 3mm) thermal performance with θJA = 50°C/W.
Technical Context
The MPQ4456GQT-Z uses peak-current-mode control with a transconductance error amplifier (Gm = 25–95 µA/V) and internal 0.8V reference to regulate output voltage via external resistive divider on FB. Its oscillator frequency is set by an external resistor on FREQ pin, supporting precise 4MHz operation with 80ns minimum on-time and 100ns minimum off-time.
It integrates bootstrap charging circuitry for the high-side driver, requiring an external BST–SW capacitor; shutdown is controlled via EN pin with 1.2V/1.5V thresholds and 300mV hysteresis. Thermal shutdown activates at 150°C with 15°C hysteresis, and UVLO engages below 2.6V (falling) with 400mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8V to 36V - supports direct connection to 12V/24V automotive batteries and industrial 24V/36V rails without pre-regulation. |
| Output Current | 1A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in distributed systems. |
| Switching Frequency | Up to 4MHz - enables use of small 2.2µH–4.7µH inductors and avoids AM radio band (0.53–1.71MHz) interference. |
| Feedback Reference | 0.8V ±2.5% - allows precise output setting from 0.8V to 36V using standard resistor tolerances (e.g., 1% R1/R2). |
| Quiescent Current | 120µA - ensures >1-year battery life in always-on 100mA-load applications powered by 3.7V Li-ion cells. |
| Efficiency | Up to 95% - achieved at mid-load (500mA–1A) with 12VIN/3.3VOUT, reducing thermal load in sealed enclosures. |
| Package Thermal Resistance | θJA = 50°C/W - enables 1A operation at +85°C ambient without forced airflow when using 2-layer PCB with 1-in² copper pour under exposed pad. |
Pinout & Package
MPQ4456GQT-Z is housed in a thermally enhanced 10-pin TQFN package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad on underside for direct PCB heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Switch Node | Drives external Schottky diode; requires low-inductance layout to minimize ringing and EMI during 4MHz transitions. |
| 3 EN | Enable Input | Logic-high enable (1.5V threshold); internal 1µA pull-up allows floating-enable; supports system-level power sequencing. |
| 4 COMP | Compensation Node | Output of Gm error amplifier; connects to RC network (e.g., 100kΩ + 100pF) to stabilize loop with ceramic output caps. |
| 5 FB | Feedback Input | Senses divided output voltage; 0.8V reference sets regulation point; bias current <1µA minimizes divider power loss. |
| 6 GND / Exposed Pad | Power & Signal Ground | Primary return path for switch current and IC ground; exposed pad must be soldered to ≥1-in² inner-layer copper for thermal conduction. |
| 7 FREQ | Frequency Set Input | Connects to ground via resistor (e.g., 18kΩ for 4MHz); tolerance directly impacts fS accuracy (±20% typical). |
| 8, 9 VIN | Input Supply | Dual pins reduce IR drop and high-frequency impedance; requires local 10µF ceramic cap within 3mm of pins. |
| 10 BST | Bootstrap Supply | Charges external BST–SW capacitor (e.g., 100nF); supplies floating gate driver; failsafe UVLO at 2.2V prevents shoot-through. |
Key Features
| Feature | Design Value |
|---|---|
| Extended PWM Operation | Maintains fixed-frequency switching down to ~10mA load, eliminating pulse-skipping noise critical for audio and RF subsystems. |
| Ceramic Capacitor Stability | Stable with zero-ESR ceramic output capacitors (e.g., 22µF X5R) without requiring added series resistance for phase margin. |
| Internal Soft-Start | 1.5ms monotonic VOUT ramp prevents inrush current into downstream LDOs or hot-plug circuits. |
| Industrial Temperature Range | –40°C to +125°C junction operation - qualified for under-hood automotive and factory-floor industrial environments. |
| High-Voltage MOSFET Integration | 300mΩ RDS(on) at VBST–VSW = 5V - eliminates external high-side switch and associated gate-drive complexity. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power Rail |
|---|---|
Use Scenario: Powering CAN transceiver, LIN bus IC, and door-lock MCU from 12V battery with cold-crank immunity. IC Role / Device Role / Timing Role: Primary 5V/1A buck regulator supplying isolated logic rails; handles 4.5V–36V input transients per ISO 7637-2. Use Value: 120µA IQ extends standby battery life; 4MHz operation avoids AM-band EMI during radio reception; UVLO hysteresis prevents cycling during cranking. |
Use Scenario: Generating 3.3V for FPGA configuration and sensor ADCs in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Point-of-load converter stepping down 24V field supply; operates continuously at +70°C ambient with no derating. Use Value: 95% efficiency reduces heat sink size; TQFN-10 footprint saves board space vs. SO-8 alternatives; -40°C start-up ensures outdoor deployment. |
| Portable Medical Diagnostic Device | Smart Building Sensor Node |
Use Scenario: Battery-powered ultrasound front-end requiring ultra-low-noise 3.3V rail for analog signal chain. IC Role / Device Role / Timing Role: Low-EMI power stage feeding precision ADC and op-amp stages; PWM-only mode suppresses switching artifacts in baseband signals. Use Value: 4MHz switching shifts noise spectrum above sensitive audio bands; 0.8V FB reference enables accurate 3.3V output with 1% resistors. |
Use Scenario: Energy-harvesting node using solar cell + supercapacitor to power Zigbee MCU and environmental sensors. IC Role / Device Role / Timing Role: Wide-input buck managing variable 3V–20V harvester output; maintains regulation during partial shading or low-light conditions. Use Value: 3.8V UVLO start-up enables operation from weakly charged supercaps; 120µA IQ maximizes energy capture between transmissions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | 2.2MHz max fS, 0.8V FB, 0.8A output, SOIC-8 package | Limited to ≤2.2MHz; higher θJA (70°C/W) requires larger thermal pad; lower current rating | Select when board space permits SOIC and 4MHz EMI avoidance is not required. |
| LM61480RQR | 3.6V–36V input, 1A, 2.1MHz, adjustable 0.8V FB, WQFN-16 | Lower max fS; includes integrated boot diode and PMOS high-side switch; higher BOM cost | Choose for simplified layout where bootstrap diode integration outweighs 4MHz capability loss. |
Compared with MPQ4456GQT-Z, MP2451DT-LF-Z trades 4MHz EMI suppression and thermal performance for legacy SOIC compatibility, while LM61480RQR adds integration at the expense of frequency agility and cost-making MPQ4456GQT-Z optimal for compact, noise-sensitive, high-temperature industrial designs.
Availability
MPQ4456GQT-Z is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power rails, and portable medical diagnostics requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MPQ4456GQT-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 manufacturing partners across Asia.
The MPQ4456 belongs to MPS's industrial-grade DC/DC converter product line, engineered for robust operation in harsh environments-including automotive, factory automation, and infrastructure-where wide input range, low IQ, and EMI resilience are mandatory.
FAQ
What is the minimum input voltage required for MPQ4456GQT-Z to start switching?
The MPQ4456GQT-Z has a UVLO rising threshold of 3.0V. It begins switching only when VIN rises above this level; operation below 3.0V is inhibited to prevent unstable regulation or excessive current draw during brown-out conditions.
Can MPQ4456GQT-Z operate with a 3.3V input?
No. The absolute minimum operating input voltage is 3.8V per the Recommended Operating Conditions table. At 3.3V, the device remains in UVLO shutdown and will not regulate-even if VIN exceeds the 3.0V UVLO threshold-due to internal regulator headroom requirements.
How is the 4MHz switching frequency programmed?
A 18kΩ resistor connected from FREQ pin (Pin 7) to GND sets 4MHz operation, per Table 1 in the datasheet. Resistor tolerance directly affects frequency accuracy; 1% metal-film is recommended for stable 4MHz performance across temperature.
Does MPQ4456GQT-Z require an external bootstrap diode?
No. The MPQ4456GQT-Z integrates a bootstrap charging circuit that uses the internal high-side switch node (SW) and VIN to charge the BST capacitor. An external diode is unnecessary unless operating at >90% duty cycle where bootstrap voltage may sag.
What is the maximum output voltage achievable with MPQ4456GQT-Z?
The datasheet specifies a maximum output voltage of 36V, limited by the absolute maximum rating of the SW pin (VIN + 0.3V). For 36V output, VIN must be ≥36.3V, but practical operation is constrained by the 36V max VIN rating-so 36V out is only possible with VIN = 36V and 0% duty cycle, which is not functional. Realistic max VOUT is VIN – VSW drop ≈ 35.7V.
Is MPQ4456GQT-Z RoHS-compliant and lead-free?
Yes. All MPS parts, including MPQ4456GQT-Z, are lead-free and fully compliant with the EU RoHS directive. The "GQT" suffix denotes green (halogen-free) packaging, and the device carries MPS's official RoHS certification per their Quality Assurance portal.
What is the purpose of the exposed thermal pad on the TQFN package?
The exposed pad (Pin 6) serves as the primary thermal and electrical ground path. It must be soldered to a dedicated PCB copper pour connected to the main GND plane. This reduces θJA from 50°C/W to ≤35°C/W in optimized layouts, enabling full 1A output at +85°C ambient.
MPQ4456GQT-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.8V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 36V
- Current - Output:
- 1A
- Frequency - Switching:
- Up to 4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TQFN (3x3)
MPQ4456GQT-Z FAQ
1.How can I place an order for MPQ4456GQT-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4456GQT-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 MPQ4456GQT-Z reliable?
The price and inventory of MPQ4456GQT-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ4456GQT-Z is usually 5 days.
3.What payment methods are accepted for MPQ4456GQT-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4456GQT-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4456GQT-Z?
MPQ4456GQT-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4456GQT-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 MPQ4456GQT-Z?
For technical support, including MPQ4456GQT-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4456GQT-Z requirements.
6.How does Aetrix verify that MPQ4456GQT-Z is sourced from the original manufacturer or authorized distributors?
All MPQ4456GQT-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 MPQ4456GQT-Z meets industry standards.
7.What is the process for return or replacement of MPQ4456GQT-Z?
All MPQ4456GQT-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4456GQT-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 MPQ4456GQT-Z part is unused and in its original packaging.
Return procedure for MPQ4456GQT-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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