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Monolithic Power Systems Inc. MP4322GDE-Z
- Part No.:
- MP4322GDE-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 12-PowerVFQFN
- Datasheet:
-
MP4322GDE-Z.pdf
- Description:
- IC REG BUCK ADJ 2A 12QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,643
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Product details
Overview
MP4322GDE-Z from Monolithic Power Systems is a 36V input, 2A synchronous step-down DC/DC converter with configurable switching frequency (350kHz–2.5MHz), 42V load dump tolerance, and 1μA shutdown current. It integrates 70mΩ/50mΩ HS/LS MOSFETs, supports automotive cold-crank down to 3.1V VIN, and delivers regulated output in fixed (1V–5V) or adjustable configurations. Used in aftermarket automotive USB chargers requiring robust transient immunity and low quiescent power.
For engineers reviewing the MP4322GDE-Z datasheet, MP4322GDE-Z pinout, MP4322GDE-Z application, or MP4322GDE-Z equivalent, key selection criteria include 42V load dump rating, -40°C to +125°C junction operation, wettable-flank QFN-12 package, AAM light-load efficiency mode, and CISPR25 Class 5 EMI compliance for automotive subsystems.
Technical Context
The MP4322 employs peak current mode control with frequency foldback during startup to prevent inductor current runaway. Its integrated 70mΩ high-side and 50mΩ low-side MOSFETs enable high efficiency across 3.3V–36V input, while advanced asynchronous modulation (AAM) reduces light-load switching losses by dynamically scaling fSW.
It features symmetric VIN pinout and Frequency Spread Spectrum (FSS) modulation to suppress EMI peaks, achieving CISPR25 Class 5 compliance. The device enters low-dropout (LDO) mode under automotive cold-crank conditions and provides hiccup-mode over-current protection with 2.7A–4.6A HS peak current limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 3.3V to 36V - supports wide automotive battery range including cold-crank (3.1V min post-startup) |
| Output current | 2A continuous - sufficient for dual-USB charging or microcontroller + peripheral rails |
| Switching frequency | 350kHz to 2.5MHz - configurable via external resistor; enables optimization of size vs. efficiency vs. EMI |
| Quiescent current | 20μA in sleep mode - extends battery life in always-on automotive modules |
| Load dump tolerance | 42V - meets ISO16750-2 pulse 5a requirements for 12V automotive systems |
| Feedback reference | 0.8V ±1% - enables precise output regulation with external resistor divider or fixed-output variants |
| Thermal shutdown | 160°C to 185°C - protects against sustained overload or poor PCB thermal design |
Pinout & Package
MP4322GDE-Z is housed in a wettable-flank QFN-12 package (2mm × 3mm), optimized for automated optical inspection (AOI) and thermal performance. The package includes exposed thermal pad connected internally to PGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 PGND | Power ground | Primary return path for high-current switching loop; must be low-inductance connection to thermal pad |
| 2, 10 VIN | Input supply | Dual pins reduce IR drop and EMI; each requires local 10μF ceramic decoupling to PGND |
| 3 BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 0.1μF ceramic capacitor between BOOT and SW |
| 4 FREQ | Frequency configuration | Resistor-to-AGND sets fSW (e.g., 86.6kΩ = 415kHz); enables EMI tuning without layout change |
| 5 VCC | Bias regulator output | Internal 5V LDO; requires ≥1μF ceramic capacitor to AGND for stable gate drive |
| 6 AGND | Analog ground | Reference for FB, EN, PG; must be star-connected to PGND at single point to avoid noise coupling |
| 7 FB | Feedback input | 0.8V reference node; connects to resistor divider (adjustable) or directly to VOUT (fixed versions) |
| 8 PG | Power good indicator | Open-drain output asserting when VOUT is within ±5.5% of nominal; requires external pull-up |
| 9 EN | Enable control | Logic-level input (1.02V threshold); no internal pull-up; must be actively driven high/low |
| 12 SW | Switch node | Connection point of HS-FET source and LS-FET drain; critical for EMI layout and snubber placement |
Key Features
| Feature | Design Value |
|---|---|
| 42V load dump tolerance | Withstands ISO16750-2 Pulse 5a transients without latch-up or parameter shift |
| Wettable flank QFN-12 | Enables reliable solder joint inspection and improves thermal transfer to PCB copper |
| Frequency spread spectrum (FSS) | ±10% modulation at 15kHz reduces peak radiated emissions to meet CISPR25 Class 5 |
| Low-dropout (LDO) mode | Maintains regulation down to VIN = VOUT + 0.3V during cold-crank, avoiding brownout |
| Hiccup over-current protection | Auto-retry current limiting prevents thermal runaway during short-circuit or overload |
| 65ns minimum on-time | Supports high VIN/VOUT ratios (e.g., 36V→5V) at 2.5MHz without pulse-skipping instability |
Applications
| Automotive USB Charging Modules | Aftermarket Head Unit Power Rails |
|---|---|
|
Use Scenario: Powering dual USB-A ports (5V/2.4A total) from vehicle battery with load dump and cold-crank resilience. IC Role / Device Role / Timing Role: Primary buck regulator delivering clean, regulated 5V with PG monitoring and thermal fault response. Use Value: Eliminates need for external TVS and discrete MOSFETs; 42V tolerance replaces costly front-end protection. |
Use Scenario: Generating 3.3V and 1.8V rails for infotainment SoC, display interface, and audio codec in non-OEM head units. IC Role / Device Role / Timing Role: Adjustable-output buck supplying core logic voltage with tight line/load regulation (<±0.1%). Use Value: 20μA sleep IQ extends standby time; AAM mode maintains >85% efficiency at 10mA load. |
| Industrial Telematics Gateways | Portable Diagnostic Tools |
|
Use Scenario: Power conversion in LTE/CAN-based fleet tracking devices operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Main 12V→3.3V converter with PG signaling system readiness and thermal derating feedback. Use Value: -40°C to +125°C TJ rating ensures reliability in sealed enclosures; QFN-12 footprint minimizes board area. |
Use Scenario: Battery-powered OBD-II scanners requiring ultra-low standby current and fast wake-up from deep sleep. IC Role / Device Role / Timing Role: System power manager enabling <1μA shutdown state and <5ms soft-start on EN assertion. Use Value: 1μA ISD extends Li-ion battery life to >6 months in storage; EN threshold hysteresis prevents false turn-on. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4322GDE-Z | Automotive-grade AEC-Q100 qualified version; identical electrical specs but enhanced reliability testing and traceability | Required for OEM-tier automotive designs; not necessary for aftermarket or industrial use | Select MPQ4322GDE-Z only if AEC-Q100 qualification is mandated by end-customer or safety standard |
| TPS54332DR | Lower 28V max VIN, no load dump rating, 3.5μA IQ, 500kHz–2.5MHz fSW, SOIC-8 package | Lacks 42V transient immunity and wettable flanks; unsuitable for direct automotive battery connection | Consider only for non-automotive 24V industrial systems where cost is prioritized over transient robustness |
Compared with MP4322GDE-Z, MPQ4322GDE-Z adds AEC-Q100 qualification for mission-critical automotive use, while TPS54332DR offers lower cost and wider fSW range but sacrifices load dump tolerance, thermal performance, and automotive temperature range.
Availability
MP4322GDE-Z is available at Aetrix Electronics and suitable for automotive USB charging modules, aftermarket head unit power rails, industrial telematics gateways, and portable diagnostic tools requiring stable component supply across extended temperature and transient-voltage environments.
Supply support for MP4322GDE-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 power management ICs, with design centers in the US, China, and Taiwan.
The MP4322 belongs to MPS's automotive-qualified DC/DC converter product line, engineered specifically for harsh-environment aftermarket and industrial applications demanding high input voltage tolerance, ultra-low IQ, and EMI robustness.
FAQ
What is the minimum input voltage required for startup?
The MP4322GDE-Z requires a minimum VIN of 3.9V to initiate startup due to its UVLO rising threshold of 3.65V (typical). Once running, it sustains regulation down to 3.1V VIN, supporting automotive cold-crank conditions without dropout.
How is switching frequency configured?
Switching frequency is set by connecting an external resistor between the FREQ pin and AGND. For example, 86.6kΩ yields 415kHz (typ), 34.8kΩ yields 1MHz (typ), and 15kΩ yields 2.2MHz (typ). The relationship is linear and documented in the Electrical Characteristics table.
Does MP4322GDE-Z support adjustable output voltage?
Yes - the MP4322GDE-Z is the adjustable-output variant. Output voltage is set using a resistor divider from VOUT to AGND, with the FB pin referenced to 0.8V. Fixed-output versions (e.g., MP4322AGDE-Z for 3.3V) are separate part numbers.
What thermal performance can be expected in a standard 4-layer PCB?
On the MPS reference EVB (8.3cm × 8.3cm, 4-layer, 2oz copper), θJA is 35.5°C/W. At 2A load and 12V input, case temperature rise is ~24°C above ambient - confirming suitability for compact, sealed automotive enclosures without forced airflow.
Is the PG pin compatible with 3.3V logic systems?
Yes - the open-drain PG pin operates with any pull-up voltage from 1.8V to 5.5V. When pulled up to 3.3V, it asserts high (≤0.3V low-state) only when VOUT is within 94.5%–105.5% of nominal, providing reliable power-good signaling for 3.3V microcontrollers.
What protection features are integrated?
The MP4322GDE-Z integrates hiccup-mode over-current protection (HS peak limit 2.7–4.6A), thermal shutdown (160–185°C), input over-voltage protection (35.5–40V), and undervoltage lockout (3.4–3.9V rising). All are fully autonomous with no external components required.
Can it operate with ceramic output capacitors only?
Yes - the MP4322GDE-Z is optimized for ceramic output capacitors. Typical designs use 22μF × 2 (X5R/X7R) with ≤22mΩ DCR. The control loop remains stable without added ESR, simplifying filtering and reducing board space versus electrolytic solutions.
MP4322GDE-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 12-PowerVFQFN
- 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):
- 3.3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 34.2V
- Current - Output:
- 2A
- Frequency - Switching:
- 350kHz ~ 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-QFN (2x3)
MP4322GDE-Z FAQ
1.How can I place an order for MP4322GDE-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4322GDE-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 MP4322GDE-Z reliable?
The price and inventory of MP4322GDE-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4322GDE-Z is usually 5 days.
3.What payment methods are accepted for MP4322GDE-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4322GDE-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4322GDE-Z?
MP4322GDE-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4322GDE-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 MP4322GDE-Z?
For technical support, including MP4322GDE-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4322GDE-Z requirements.
6.How does Aetrix verify that MP4322GDE-Z is sourced from the original manufacturer or authorized distributors?
All MP4322GDE-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 MP4322GDE-Z meets industry standards.
7.What is the process for return or replacement of MP4322GDE-Z?
All MP4322GDE-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4322GDE-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 MP4322GDE-Z part is unused and in its original packaging.
Return procedure for MP4322GDE-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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