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Monolithic Power Systems Inc. MP4462DQ-LF-Z
- Part No.:
- MP4462DQ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP4462DQ-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 3.5A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,935
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Product details
Overview
MP4462DQ-LF-Z from Monolithic Power Systems is a 3.5A, 4MHz, 36V non-synchronous step-down DC/DC converter with integrated 150mΩ high-side MOSFET, 120µA quiescent current, and programmable switching frequency via external resistor on FREQ pin. It operates across 3.8V–36V input range and delivers adjustable output from 0.8V to 30V - used in automotive infotainment power rails where high-frequency operation avoids AM-band EMI.
For engineers reviewing the MP4462DQ-LF-Z datasheet, MP4462DQ-LF-Z pinout, MP4462DQ-LF-Z application, or MP4462DQ-LF-Z equivalent, key selection criteria include its 4MHz max switching frequency capability, internal current limit (4.7A typ), thermal shutdown threshold (150°C), and QFN10 package thermal resistance (θJA = 50°C/W).
Technical Context
The MP4462DQ-LF-Z implements peak current-mode control with internal error amplifier (Gm = 60µA/V, gain = 200V/V), programmable oscillator (set by RFREQ to ground), and internal soft-start (1.5ms ramp). Its bootstrap driver powers the high-side gate using a capacitor between BST and SW pins, requiring ≥100ns minimum off time and 100ns minimum on time.
It features under-voltage lockout (UVLO rising threshold = 3.0V, hysteresis = 0.35V), precision enable logic (EN rising threshold = 1.5V, hysteresis = 300mV), and frequency foldback at light load to maintain efficiency. The FB pin references an internal 0.8V (±3%) bandgap, enabling accurate output regulation without external sensing resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8V to 36V - supports direct connection to automotive battery (9V–16V) and industrial 24V/36V rails without pre-regulation. |
| Output Current | 3.5A continuous - sufficient for powering FPGA I/O banks, DSP cores, or multi-rail PMIC front-ends. |
| Switching Frequency | Up to 4MHz - enables use of sub-3.3µH inductors and reduces EMI in noise-sensitive radio/audio systems. |
| Quiescent Current | 120µA - extends battery life in always-on telematics modules and low-power sensor nodes. |
| Internal MOSFET RDS(on) | 150mΩ - limits conduction loss to <150mW at 1A, reducing thermal stress in compact QFN10 layout. |
| Feedback Reference | 0.8V ±3% - allows precise output setting down to 0.8V for modern low-voltage processors and memory interfaces. |
| Thermal Shutdown | 150°C with 15°C hysteresis - provides fault-tolerant protection during overload or poor PCB heatsinking. |
Pinout & Package
MP4462DQ-LF-Z is housed in a thermally enhanced 3×3mm QFN10 package with exposed thermal pad (pin 5, GND), optimized for high-current DC/DC conversion in space-constrained automotive and industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1,2) | Switch Node | High-current drain of internal MOSFET; requires low-inductance Schottky diode path to GND and tight layout to minimize voltage spikes. |
| EN (Pin 3) | Enable Input | Positive-logic control with 1.5V rising threshold; internal 1µA pull-up enables default-on operation when left floating. |
| COMP (Pin 4) | Error Amplifier Output | Connects to RC compensation network; clamped between 0.9V–2.0V to stabilize current-mode loop and prevent saturation. |
| FB (Pin 5) | Feedback Input | Senses divided output voltage; referenced to internal 0.8V bandgap - sets VOUT = 0.8V × (1 + R1/R2). |
| GND (Pin 6, Exposed Pad) | Power & Signal Ground | Primary return path for high-switching-current loops; exposed pad must be soldered to solid GND plane for θJC = 12°C/W thermal performance. |
| FREQ (Pin 7) | Frequency Programming | Connect external resistor to GND to set fSW: 45kΩ → 2MHz, 18kΩ → 4MHz per datasheet Table 1. |
| VIN (Pins 8,9) | Input Supply | Supplies internal regulators and high-side driver; requires local 10µF ceramic decoupling placed within 2mm of pins. |
| BST (Pin 10) | Bootstrap Supply | Charged via external capacitor to SW; maintains gate drive voltage >5V for high-side MOSFET during duty cycles up to ~95%. |
Key Features
| Feature | Design Value |
|---|---|
| Ceramic-capacitor stable | Supports low-ESR MLCCs without external compensation - eliminates need for tantalum/electrolytic bulk caps in space-limited designs. |
| Internally set current limit | 4.7A typical cycle-by-cycle limit - removes external sense resistor, saving board area and eliminating 1–2% power loss from sensing. |
| Internal soft-start | 1.5ms controlled ramp - prevents output overshoot and inrush current into downstream LDOs or capacitive loads. |
| Frequency foldback | Reduces fSW at light load - cuts switching losses to sustain >85% efficiency even at 1mA output, critical for standby modes. |
| UVLO with hysteresis | 3.0V turn-on / 2.6V turn-off - ensures clean startup after cold-crank (down to 6V) and prevents oscillation near brownout thresholds. |
Applications
| Automotive Infotainment | Industrial PLC I/O Power |
|---|---|
|
Use Scenario: Powering 3.3V/1.8V rails for display controllers and audio codecs in head units. IC Role / Device Role / Timing Role: Primary buck regulator delivering 3.5A at 4MHz to avoid interference with AM/FM reception bands. Use Value: 4MHz operation shifts switching harmonics above 100MHz, eliminating filter components required at 500kHz solutions. |
Use Scenario: Generating isolated 5V/12V supplies for digital I/O modules in factory automation cabinets. IC Role / Device Role / Timing Role: High-input-voltage step-down stage accepting 24VDC field bus and regulating to 5V for microcontroller peripherals. Use Value: 36V absolute max rating and 3.8V–36V operating range tolerate 24V transients up to ±40V without external TVS clamping. |
| Battery-Powered Telematics | Distributed Telecom Power |
|
Use Scenario: Power management in GPS/GLONASS vehicle trackers with Li-ion (3.0–4.2V) or lead-acid (9–14V) input. IC Role / Device Role / Timing Role: Main system regulator with ultra-low 120µA quiescent current enabling >1-year battery life in sleep mode. Use Value: 120µA IQ allows 10µA system sleep current - critical for meeting ISO 16750-2 Class D (100µA max draw) requirements. |
Use Scenario: Point-of-load conversion for remote radio units in 4G/5G small cells powered from 48V backplane. IC Role / Device Role / Timing Role: Intermediate 12V rail generator feeding downstream POL converters for RF amplifiers and FPGAs. Use Value: QFN10 package with θJA = 50°C/W sustains 3.5A output at 70°C ambient without forced air - reduces heatsink cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4462DQ-LF-Z | Automotive-grade AEC-Q100 qualified version with extended temp range (–40°C to +125°C) and enhanced ESD tolerance (±8kV HBM). | Required for ASIL-B functional safety paths; not suitable for commercial temperature grade unless qualification is mandated. | Select MPQ4462DQ-LF-Z only if automotive qualification or extended junction temperature margin is required. |
| LM61480RQR | TI part with synchronous rectification, 50mΩ/60mΩ dual MOSFETs, and 1.5MHz fixed frequency; lacks programmable fSW and has higher IQ (18µA vs 120µA). | Better light-load efficiency due to sync FET but cannot reach 4MHz - unsuitable for AM-band EMI avoidance. | Choose LM61480RQR when highest full-load efficiency (>95%) is prioritized over EMI performance and ultra-low IQ. |
Compared with MP4462DQ-LF-Z, MPQ4462DQ-LF-Z adds automotive qualification at no cost penalty in size or efficiency, while LM61480RQR trades programmable high-frequency operation for synchronous efficiency - making MP4462DQ-LF-Z optimal for EMI-sensitive, battery-conscious, and cost-sensitive industrial designs.
Availability
MP4462DQ-LF-Z is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O power, and battery-powered telematics requiring stable component supply across long production lifecycles.
Supply support for MP4462DQ-LF-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 MP4462 belongs to MPS's high-frequency buck converter product line, engineered for EMI-sensitive applications like automotive audio and industrial control where 2–4MHz operation avoids regulatory frequency bands and enables miniaturized magnetics.
FAQ
What is the maximum recommended input voltage for reliable 4MHz operation?
The MP4462DQ-LF-Z supports 4MHz switching only up to 12V input per Figure 2 in the datasheet. At VIN >12V, minimum on-time limitation causes pulse-skipping; for 24V input, reduce fSW to ≤2MHz using RFREQ = 30kΩ to ensure stable regulation and avoid subharmonic oscillation.
Can the MP4462DQ-LF-Z drive a 10µH inductor at 4MHz without saturation?
Yes - with 3.5A output and 30% ripple target (1.05A ΔIL), the required inductance is ~1.2µH at 12V input. A 10µH inductor is oversized but usable; however, its higher DCR increases conduction loss. Wurth 7447789004 (4.7µH, 2.9A rating) is the optimal match per Table 2.
Is an external bootstrap diode required for MP4462DQ-LF-Z?
No - the MP4462DQ-LF-Z integrates a bootstrap charging circuit that uses VIN to charge the BST capacitor through an internal PMOS when SW is low. An external diode is only needed if duty cycle exceeds 95% or if VIN–VOUT < 3V, which is uncommon in standard 12V→3.3V or 24V→5V designs.
How does the internal current limit behave during short-circuit conditions?
Under short-circuit, the MP4462DQ-LF-Z enters hiccup mode: it limits peak switch current to 4.7A, shuts down for ~500µs upon overcurrent detection, then retries. This prevents thermal runaway while delivering ~200mA average short-circuit current - sufficient for fault signaling without tripping upstream fuses.
What is the minimum output voltage achievable with MP4462DQ-LF-Z?
The minimum regulated output is 0.8V, set by the internal feedback reference. To achieve lower voltages (e.g., 0.6V), an external reference can be injected into the FB node, but this voids guaranteed accuracy and stability - the device is not characterized for operation below 0.8V.
Does MP4462DQ-LF-Z support forced PWM mode?
No - the MP4462DQ-LF-Z uses automatic frequency foldback at light load and cannot be forced into fixed-frequency PWM. For applications requiring constant switching frequency across all loads (e.g., spread-spectrum EMI reduction), consider the pin-compatible MP4463 or MPQ4463 variants.
How is thermal performance affected by the exposed pad soldering?
Unsoldered exposed pad increases θJA from 50°C/W to >90°C/W, raising junction temperature by ~40°C at 3.5A. Full thermal pad soldering to a 4-layer PCB with 2-in² GND copper pour is mandatory to meet 125°C max operating junction temperature at full load.
MP4462DQ-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 10-VFDFN 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):
- 30V
- Current - Output:
- 3.5A
- 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-QFN (3x3)
MP4462DQ-LF-Z FAQ
1.How can I place an order for MP4462DQ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4462DQ-LF-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 MP4462DQ-LF-Z reliable?
The price and inventory of MP4462DQ-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4462DQ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP4462DQ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4462DQ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4462DQ-LF-Z?
MP4462DQ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4462DQ-LF-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 MP4462DQ-LF-Z?
For technical support, including MP4462DQ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4462DQ-LF-Z requirements.
6.How does Aetrix verify that MP4462DQ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP4462DQ-LF-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 MP4462DQ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP4462DQ-LF-Z?
All MP4462DQ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4462DQ-LF-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 MP4462DQ-LF-Z part is unused and in its original packaging.
Return procedure for MP4462DQ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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