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Monolithic Power Systems Inc. MP4320GDE-P
- Part No.:
- MP4320GDE-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 12-PowerVFQFN
- Datasheet:
-
MP4320GDE-P.pdf
- Description:
- IC REG BUCK ADJ 500MA 12QFN
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
MP4320GDE-P from Monolithic Power Systems is a 36V, 0.5A synchronous step-down DC/DC converter with integrated 70mΩ high-side and 50mΩ low-side MOSFETs, configurable switching frequency (350kHz–1.8MHz), 42V load dump tolerance, and 1μA shutdown current. It operates across -40°C to +125°C and supports automotive cold-crank (3.1V VIN) in USB chargers and aftermarket automotive power rails.
For engineers reviewing the MP4320GDE-P datasheet, MP4320GDE-P pinout, MP4320GDE-P application, or MP4320GDE-P equivalent, key selection criteria include 42V load dump survival, low-IQ operation under battery-powered standby, fixed/flexible output configuration (0.8V–5V), and CISPR25 Class 5 EMI compliance for automotive subsystems.
Technical Context
The MP4320GDE-P uses peak current mode control with frequency foldback during start-up to prevent inductor current runaway. Its advanced asynchronous modulation (AAM) reduces light-load switching losses by dynamically scaling fSW, while integrated MeshConnect™ flip-chip QFN-12 packaging improves thermal resistance (θJC = 7.3°C/W) and EMC performance.
It implements dual over-current protection (hiccup-mode HS/LS valley current limit), thermal shutdown at 160–185°C with 20°C hysteresis, and low-dropout (LDO) mode enabling regulation down to VIN = VOUT + 0.2V - critical for automotive cold-crank where input may dip to 3.1V while maintaining 3.3V or 5V outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 36V continuous; survives 42V transient load dump per ISO16750 - enables direct connection to automotive battery without external TVS. |
| Output Current | Up to 0.5A continuous; supported by integrated 70mΩ HS-FET and 50mΩ LS-FET - eliminates need for external power stage in compact USB PD or infotainment rails. |
| Quiescent Current | 20μA in sleep mode; 1μA in shutdown - extends battery life in always-on telematics or ADAS sensors. |
| Switching Frequency | Configurable 350kHz–1.8MHz via external resistor on FREQ pin - allows optimization of size (higher fSW → smaller inductor) vs. efficiency (lower fSW → reduced gate loss). |
| Power Good Threshold | 94.5%–105.5% of nominal VOUT on open-drain PG pin - provides precise system-level power sequencing and fault detection. |
| EMI Compliance | CISPR25 Class 5 compliant with FSS modulation and symmetric VIN pinout - meets OEM EMI requirements without added filtering in head units or camera modules. |
| Thermal Protection | Thermal shutdown at 160–185°C with 20°C hysteresis - ensures safe operation under sustained 0.5A load in sealed enclosures. |
Pinout & Package
MP4320GDE-P is housed in a wettable-flank QFN-12 package (2mm × 3mm), optimized for automated optical inspection (AOI) and thermal performance (θJA = 35.5°C/W on 4-layer EVB). The package integrates exposed thermal pad connected internally to PGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 PGND | Power ground reference | Low-impedance return path for high di/dt switch currents; must be tied directly to thermal pad and decoupling caps. |
| 2, 10 VIN | Main input supply | Dual pins reduce IR drop and EMI; each requires local 1μF ceramic cap to PGND near pin. |
| 3 BOOT | High-side gate driver supply | Connected via 0.1μF capacitor to SW; enables bootstrap charging for HS-FET drive above VIN. |
| 4 FREQ | Frequency configuration | Resistor-to-AGND sets fSW (e.g., 86.6kΩ → 415kHz); enables EMI tuning and inductor size trade-offs. |
| 5 VCC | Bias regulator output | Internal 5V LDO output; requires ≥1μF ceramic cap to AGND for stable gate drive and control logic. |
| 6 AGND | Analog ground reference | Separate from PGND to minimize noise coupling into FB and PG comparators. |
| 7 FB | Feedback input | 0.8V reference; connects to resistive divider (adjustable) or directly to VOUT (fixed versions) for regulation. |
| 8 PG | Power good indicator | Open-drain output; pulled high only when VOUT is within ±5.5% of target - used for MCU reset or enable sequencing. |
| 9 EN | Enable control | Logic-level input (1.02V threshold); no internal pull-up - must be actively driven to avoid floating state. |
| 12 SW | Switch node | Connection point between HS-FET source and LS-FET drain; routes high-frequency AC to external inductor. |
Key Features
| Feature | Design Value |
|---|---|
| 42V Load Dump Tolerance | Withstands automotive transients without latch-up or damage - eliminates need for upstream TVS in cost-sensitive aftermarket modules. |
| Low-Dropout (LDO) Mode | Maintains regulation when VIN drops to VOUT + 0.2V - sustains 3.3V/5V output during cold-crank events down to 3.1V input. |
| Frequency Spread Spectrum (FSS) | ±10% modulation at 15kHz - reduces peak EMI amplitude to meet CISPR25 Class 5 without increasing filter size or cost. |
| Hiccup Over-Current Protection | Auto-retry current limiting during short-circuit - prevents thermal runaway while allowing recovery after fault clears. |
| Wettable Flank QFN | Side-wettable leads enable AOI-compatible solder joint inspection - improves manufacturing yield in automotive-grade SMT lines. |
Applications
| USB Chargers | Aftermarket Automotive Modules |
|---|---|
Use Scenario: Compact 5V/3A USB-C power delivery adapter for vehicle dash mounts. IC Role / Device Role / Timing Role: Primary buck regulator converting 12V battery to stable 5V rail with fast transient response. Use Value: 42V load dump tolerance avoids external clamping; 1μA shutdown current preserves battery during parking mode. | Use Scenario: Rear-view camera power supply in retrofit kits operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Single-chip 3.3V supply with cold-crank support and thermal shutdown. Use Value: LDO mode maintains 3.3V output at 3.1V VIN; -40°C to +125°C TJ rating ensures reliability in unventilated enclosures. |
| Battery-Powered Telematics | Infotainment Display Backlight |
Use Scenario: GPS tracker powered by Li-ion battery with multi-year standby requirement. IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter supplying 3.3V MCU core voltage. Use Value: 20μA sleep IQ and 1μA shutdown extend battery life beyond 5 years in periodic wake-up operation. | Use Scenario: LED backlight driver bias supply in automotive center console displays. IC Role / Device Role / Timing Role: Efficient 5V rail generator feeding constant-current LED driver IC. Use Value: CISPR25 Class 5 compliance prevents display flicker or noise coupling into video signal paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQR | Higher 8A output; 3.5V–36V input; no 42V load dump rating; 15μA IQ | Targeted at high-power ADAS ECUs, not cost-sensitive aftermarket modules | Select if >0.5A output or lower thermal resistance (θJA = 22.5°C/W) is required; avoid if 42V transient immunity is mandatory. |
| TPS62865ARGRR | 6A output; 2.7V–6V input; 2.5μA IQ; no automotive qualification or load dump rating | Designed for portable consumer electronics, not automotive environments | Choose only for non-automotive battery-powered systems needing higher current and lower IQ; unsuitable for 12V/24V vehicle rails. |
Compared with LM61480RQR and TPS62865ARGRR, MP4320GDE-P uniquely balances 42V load dump survival, -40°C to +125°C operation, and sub-1μA shutdown - making it optimal for space-constrained, cost-sensitive automotive accessories where transient robustness and ultra-low standby power are non-negotiable.
Availability
MP4320GDE-P is available at Aetrix Electronics and suitable for USB chargers, aftermarket automotive modules, battery-powered telematics, and infotainment display backlight supplies requiring stable component supply across extended temperature and transient-voltage conditions.
Supply support for MP4320GDE-P 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 MP4320 product line targets automotive-grade DC/DC conversion for aftermarket and embedded vehicle systems, emphasizing transient robustness, wide temperature operation, and EMI-compliant integration in minimal footprint packages.
FAQ
What is the minimum input voltage required for startup and continuous operation?
The MP4320GDE-P starts up when VIN exceeds 3.65V (typical UVLO rising threshold) and continues regulating down to 3.1V (UVLO falling threshold) under cold-crank conditions. Below 3.1V, the device shuts down but remains functional upon VIN recovery - critical for engine-start scenarios in 12V automotive systems.
How does the frequency spread spectrum (FSS) feature reduce EMI?
FSS modulates the switching frequency by ±10% at 15kHz, spreading energy across a bandwidth instead of concentrating it at discrete harmonics. This lowers peak conducted and radiated emissions to meet CISPR25 Class 5 limits without adding ferrite beads or common-mode chokes in the BOM.
Can MP4320GDE-P operate with an adjustable output voltage?
Yes - the FB pin accepts a resistive divider to set VOUT from 0.8V up to 0.95×VIN. For example, using R1=100kΩ and R2=19.1kΩ yields 5.0V output. Fixed-output variants (1V, 1.8V, 3.3V, etc.) are also available with FB internally connected to VOUT.
What thermal derating applies at 125°C junction temperature?
At TJ = 125°C, the maximum continuous output current is reduced to ~0.4A due to increased RDS(ON) of internal MOSFETs (HS-FET rises to ~130mΩ, LS-FET to ~90mΩ). Derating curves in Figure 14 confirm <5°C case rise at 0.5A with 4-layer PCB cooling.
Is the PG pin compatible with 1.8V or 3.3V logic interfaces?
Yes - the open-drain PG pin can be pulled up to any voltage ≤6V. Using a 3.3V pull-up resistor (e.g., 10kΩ) ensures clean logic-level signaling to 3.3V microcontrollers, while its 0.3V max low-level output guarantees reliable low-state detection.
Does MP4320GDE-P support forced PWM mode to eliminate frequency variation?
No - MP4320GDE-P uses automatic AAM mode at light loads to improve efficiency; it lacks a dedicated MODE pin for forced PWM. However, setting fSW >1MHz and using small inductors minimizes audible noise and maintains consistent timing for sensitive analog circuits.
What is the recommended layout practice for the BOOT capacitor?
A 0.1μF X7R ceramic capacitor must be placed directly between BOOT and SW pins with minimal trace length (<2mm) and no vias. This ensures reliable high-side gate drive during 100ns-scale switching transitions and prevents shoot-through or bootstrap depletion.
MP4320GDE-P 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:
- 500mA
- Frequency - Switching:
- 350kHz ~ 1.8MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-QFN (2x3)
MP4320GDE-P FAQ
1.How can I place an order for MP4320GDE-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4320GDE-P 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 MP4320GDE-P reliable?
The price and inventory of MP4320GDE-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4320GDE-P is usually 5 days.
3.What payment methods are accepted for MP4320GDE-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4320GDE-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4320GDE-P?
MP4320GDE-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4320GDE-P 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 MP4320GDE-P?
For technical support, including MP4320GDE-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4320GDE-P requirements.
6.How does Aetrix verify that MP4320GDE-P is sourced from the original manufacturer or authorized distributors?
All MP4320GDE-P 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 MP4320GDE-P meets industry standards.
7.What is the process for return or replacement of MP4320GDE-P?
All MP4320GDE-P units undergo pre-shipment inspection (PSI). If there is an issue with MP4320GDE-P, 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 MP4320GDE-P part is unused and in its original packaging.
Return procedure for MP4320GDE-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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