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Monolithic Power Systems Inc. MP4321GDE-P
- Part No.:
- MP4321GDE-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 12-PowerVFQFN
- Datasheet:
-
MP4321GDE-P.pdf
- Description:
- IC REG BUCK ADJ 1A 12QFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,480
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Product details
Overview
MP4321GDE-P from Monolithic Power Systems is a 36V, 1A synchronous step-down DC/DC converter with integrated 70mΩ/50mΩ MOSFETs, configurable switching frequency (350kHz–2.5MHz), 42V load dump tolerance, and 1μA shutdown current. It operates from 3.3V to 36V input, supports automotive cold crank down to 3.1V, and delivers regulated output in adjustable or fixed configurations for USB chargers and aftermarket automotive electronics.
For engineers reviewing the MP4321GDE-P datasheet, MP4321GDE-P pinout, MP4321GDE-P application, or MP4321GDE-P equivalent, key selection criteria include its QFN-12 wettable flank package, CISPR25 Class 5 EMI compliance, low-quiescent-current AAM mode, thermal shutdown at 175°C, and power-good monitoring with ±1.5% threshold hysteresis.
Technical Context
The MP4321GDE-P uses peak current-mode control with frequency foldback during start-up to prevent inductor current runaway. Its advanced asynchronous modulation (AAM) dynamically scales switching frequency under light loads to minimize gate driver and switching losses while maintaining regulation.
It integrates high-side and low-side MOSFETs with 65ns minimum on-time and 50ns minimum off-time, enabling high duty-cycle operation for low-VIN conditions. The device implements zero-current detection (ZCD), hiccup-mode over-current protection, and a dedicated bootstrap circuit for HS-FET drive.
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 after start-up) |
| Output Current | 1A continuous - sufficient for USB PD 5V/1A and auxiliary automotive rails |
| Switching Frequency | 350kHz to 2.5MHz - programmable via external resistor; enables optimization for size (high-f) or efficiency (low-f) |
| Quiescent Current | 20μA in sleep mode - extends battery life in always-on vehicle systems |
| Load Dump Tolerance | 42V - meets ISO 16750-2 for automotive transient immunity |
| Thermal Shutdown | 175°C with 20°C hysteresis - ensures fault-tolerant operation in enclosed automotive enclosures |
| Power Good Accuracy | ±1.5% threshold hysteresis - provides reliable system reset and sequencing signaling |
Pinout & Package
MP4321GDE-P is housed in a QFN-12 (2mm × 3mm) package with wettable flanks for automated optical inspection (AOI) and enhanced solder joint reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 PGND | Power ground reference | Dual low-inductance ground paths for high-frequency return currents; requires local decoupling |
| 2, 10 VIN | Main input supply | Internally connected dual pins reduce IR drop and improve transient response; each requires dedicated 10µF ceramic capacitor to PGND |
| 3 BOOT | Bootstrap supply for HS-FET gate driver | Connects to SW node via 0.1µF ceramic capacitor; enables high-side NMOS drive above VIN |
| 4 FREQ | Frequency setting input | Resistor-to-AGND sets fSW from 350kHz to 2.5MHz; enables EMI tuning and inductor size optimization |
| 5 VCC | Bias regulator output | Internal LDO supplies control logic; requires ≥1µF ceramic capacitor to AGND for stability |
| 6 AGND | Analog ground reference | Separate ground for feedback and reference circuits; must be star-connected to PGND at single point |
| 7 FB | Feedback input | 0.8V reference; connects to resistor divider for adjustable outputs or directly to VOUT for fixed versions |
| 8 PG | Open-drain power-good indicator | Signals VOUT within ±5.5% of nominal; requires external pull-up for host microcontroller monitoring |
| 9 EN | Enable control | Logic-level input (1.02V rising threshold); no internal pull-up; must be actively driven |
| 12 SW | Switch node | Drives external inductor; high di/dt node requiring tight layout and minimized loop area |
Key Features
| Feature | Design Value |
|---|---|
| MeshConnect™ Flip-Chip Package | Reduces thermal resistance (θJC = 3.5°C/W) and improves power density vs. standard QFN |
| Frequency Spread Spectrum (FSS) | ±10% modulation at 15kHz - lowers peak EMI by spreading energy across bandwidth |
| Low-Dropout (LDO) Mode | Enables regulation down to VIN = VOUT + 0.3V - critical for automotive cold-crank operation |
| CISPR25 Class 5 Compliance | Validated with typical application circuit and EMI filters - eliminates need for external shielding in infotainment modules |
| Symmetric VIN Pinout | Dual VIN pins placed opposite each other - minimizes PCB current loop area and reduces radiated emissions |
Applications
| USB Charging Module | Aftermarket Automotive Camera System |
|---|---|
Use Scenario: Compact 5V/1A power rail for rear-view or dash cameras powered from vehicle battery. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 5V output with load dump immunity and cold-crank support. Use Value: Eliminates need for external TVS or pre-regulator; 1μA shutdown current prevents battery drain during vehicle off-state. | Use Scenario: Power supply for ADAS camera ECU operating in engine bay with wide temperature and voltage transients. IC Role / Device Role / Timing Role: Main DC/DC converter providing 3.3V or 5V rail with thermal shutdown and PG monitoring for safe boot sequencing. Use Value: MeshConnect™ package maintains junction temperature below 125°C at 1A load in 85°C ambient; CISPR25 Class 5 compliance avoids costly EMI rework. |
| Battery-Powered Telematics Unit | Automotive Infotainment Display Backlight |
Use Scenario: OBD-II dongle with BLE connectivity requiring ultra-low standby power and robust start-up under fluctuating battery voltage. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with AAM light-load mode and 3.1V cold-crank support. Use Value: 20μA sleep current extends coin-cell or supercap backup runtime; 65ns tON_MIN enables use of small inductors for compact form factor. | Use Scenario: LED backlight driver power stage in center-stack display, subject to load dump and thermal cycling. IC Role / Device Role / Timing Role: Pre-regulator supplying constant current LED driver IC with tightly regulated 5V or 12V input. Use Value: 42V load dump tolerance protects downstream LED drivers; PG signal enables backlight enable/disable synchronization with display controller. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQWR | Higher 3.5A rating, 4.2V–36V input, no wettable flanks, 2.1MHz max fSW | Targets higher-current infotainment SoCs; lacks 42V load dump rating | Select when >1A output or lower RDS(ON) required; verify external TVS needed for load dump |
| TPS543320RHLR | 3A rating, 4.5V–18V input, PMBus interface, 1.8MHz max fSW, no load dump tolerance | Designed for server/industrial POL; lacks automotive qualification and cold-crank support | Choose only for non-automotive applications requiring digital configuration and telemetry |
Compared with LM61480RQWR and TPS543320RHLR, MP4321GDE-P uniquely combines 42V load dump tolerance, 3.1V cold-crank operation, wettable flank packaging, and CISPR25 Class 5 compliance in a 1A solution-making it the only drop-in fit for space-constrained aftermarket automotive modules requiring full AEC-Q100 adjacent qualification.
Availability
MP4321GDE-P is available at Aetrix Electronics and suitable for USB charging modules, aftermarket automotive camera systems, battery-powered telematics units, and infotainment display backlight supplies requiring stable component supply across extended temperature and voltage ranges.
Supply support for MP4321GDE-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 MP4321 product line targets cost-sensitive, space-constrained automotive aftermarket applications requiring robustness against load dump, cold crank, and EMI-delivering integrated power solutions without external protection components.
FAQ
What is the minimum input voltage required to start up the MP4321GDE-P?
The MP4321GDE-P requires a minimum input voltage of 3.9V to initiate start-up, per its UVLO rising threshold specification. Once operational, it sustains regulation down to 3.1V, enabling functionality during automotive cold-crank events where battery voltage dips transiently.
Does the MP4321GDE-P require an external bootstrap capacitor?
Yes - a 0.1µF ceramic capacitor must be placed between the BOOT and SW pins. This capacitor supplies gate drive energy for the high-side MOSFET during each switching cycle and is essential for proper HS-FET turn-on; omission causes immediate failure to regulate.
How is switching frequency configured on the MP4321GDE-P?
Switching frequency is set by connecting a resistor between the FREQ pin and AGND. Values from 15kΩ to 100kΩ yield 2.2MHz to 415kHz respectively. The relationship is monotonic and documented in the Electrical Characteristics table; no calibration or trimming is required.
Can the MP4321GDE-P operate without the PG pin connected?
Yes - the PG pin is optional and may be left floating if power-good monitoring is not needed. However, if used, it must be pulled up externally (e.g., to 3.3V or 5V) with a resistor; the open-drain output drives low only when VOUT falls outside 94.5–105.5% of nominal.
What thermal performance can be expected in a 4-layer PCB layout?
On an 8.3cm × 8.3cm, 4-layer PCB with 2oz copper (EVQ4321-D-00A reference board), θJA is 35.5°C/W. At 1A load and 12V input, case temperature rise is ≤12°C - well within the -40°C to +125°C junction range, assuming ambient ≤85°C.
Is the MP4321GDE-P qualified to AEC-Q100?
No - MP4321GDE-P is not AEC-Q100 qualified. However, it is explicitly designed for aftermarket automotive use with 42V load dump tolerance (per ISO 16750-2), -40°C to +125°C operating junction temperature, and built-in protections aligned with automotive reliability requirements.
What is the purpose of the symmetric VIN pinout?
The symmetric VIN pinout (pins 2 and 10 placed diagonally opposite) minimizes high-frequency input current loop area on the PCB. This reduces magnetic field radiation and improves conducted/radiated EMI performance - a key factor in achieving CISPR25 Class 5 compliance without added filtering.
MP4321GDE-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:
- 1A
- 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)
MP4321GDE-P FAQ
1.How can I place an order for MP4321GDE-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4321GDE-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 MP4321GDE-P reliable?
The price and inventory of MP4321GDE-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4321GDE-P is usually 5 days.
3.What payment methods are accepted for MP4321GDE-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4321GDE-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4321GDE-P?
MP4321GDE-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4321GDE-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 MP4321GDE-P?
For technical support, including MP4321GDE-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4321GDE-P requirements.
6.How does Aetrix verify that MP4321GDE-P is sourced from the original manufacturer or authorized distributors?
All MP4321GDE-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 MP4321GDE-P meets industry standards.
7.What is the process for return or replacement of MP4321GDE-P?
All MP4321GDE-P units undergo pre-shipment inspection (PSI). If there is an issue with MP4321GDE-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 MP4321GDE-P part is unused and in its original packaging.
Return procedure for MP4321GDE-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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