My Inquiry
My Account
Monolithic Power Systems Inc. MP4320GDE-Z
- Part No.:
- MP4320GDE-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 12-PowerVFQFN
- Datasheet:
-
MP4320GDE-Z.pdf
- Description:
- IC REG BUCK ADJ 500MA 12QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MP4320GDE-Z 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 min VIN) in aftermarket USB chargers and battery-powered systems.
For engineers reviewing the MP4320GDE-Z datasheet, MP4320GDE-Z pinout, MP4320GDE-Z application, or MP4320GDE-Z equivalent, key selection criteria include 42V transient survivability, low-IQ operation under light loads, CISPR25 Class 5 EMI compliance, and QFN-12 wettable flank package suitability for automated optical inspection (AOI) in automotive-grade production.
Technical Context
The MP4320 employs peak current mode control with frequency foldback during start-up to prevent inductor current runaway. Its integrated power stage enables high efficiency across wide input (3.3V–36V) and output (0.8V–0.95×VIN) ranges, while advanced asynchronous modulation (AAM) reduces gate driver losses at light loads.
Thermal management is enhanced by MeshConnect™ flip-chip packaging and symmetric VIN pinout, enabling low θJA (35.5°C/W on EVB). The device delivers LDO-mode operation during cold-crank and hiccup over-current protection with zero-current detection threshold of ±0.15A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 36V continuous; withstands 42V automotive load dump transients per ISO16750. |
| Output Current | 0.5A continuous; peak current limit set at 0.8–2A (HS) and 0.5–1.5A (LS) for robust overload handling. |
| Switching Frequency | Configurable 350kHz–1.8MHz via external resistor; ±10% spread-spectrum modulation for EMI reduction. |
| Quiescent Current | 20μA in sleep mode; 1μA in shutdown-enables multi-year battery life in always-on automotive modules. |
| Power Good Threshold | 94.5%–105.5% of nominal VOUT with 1.5% hysteresis; open-drain PG signal supports system sequencing. |
| Thermal Protection | 160°C–185°C thermal shutdown with 20°C hysteresis; prevents permanent damage during sustained overload. |
| Package | QFN-12 (2mm × 3mm) with wettable flanks-supports AOI and improves solder joint reliability in automotive PCBs. |
Pinout & Package
MP4320GDE-Z is housed in a thermally enhanced QFN-12 (2mm × 3mm) package with wettable flanks and exposed thermal pad. Pin layout follows symmetric VIN routing to minimize loop inductance and improve EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 PGND | Power ground reference | Low-impedance return path for high-frequency switching currents; must be connected to solid ground plane beneath IC. |
| 2, 10 VIN | Main input supply | Dual pins reduce IR drop and EMI; each requires local 1μF ceramic decoupling to PGND near pin. |
| 3 BOOT | High-side gate driver supply | Connected via 0.1μF capacitor to SW; refreshes bootstrap voltage during HS-FET conduction. |
| 4 FREQ | Frequency configuration | Resistor-to-AGND sets fSW; 86.6kΩ yields 415kHz, 34.8kΩ yields 1MHz, 15kΩ yields 2.2MHz. |
| 5 VCC | Bias regulator output | Internal 5V LDO; requires ≥1μF ceramic cap to AGND for stable gate drive and control logic. |
| 6 AGND | Analog ground reference | Separate from PGND; connects FB, PG, EN, FREQ; routed away from noisy power traces. |
| 7 FB | Feedback input | 0.8V reference; for adjustable outputs, forms divider with R1/R2; fixed-output versions tie FB directly to VOUT. |
| 8 PG | Power good indicator | Open-drain output; pulled high when VOUT is within ±5.5% of target; deglitched (70μs rise, 60μs fall). |
| 9 EN | Enable control | Logic-level input; active-high with 1.02V rising threshold; no internal pull-up-must be driven. |
| 12 SW | Switch node | Drain of LS-FET/source of HS-FET; connects to inductor; high dv/dt node requiring tight layout. |
Key Features
| Feature | Design Value |
|---|---|
| 42V Load Dump Tolerance | Survives ISO16750-2 pulse 5a transients without latch-up or parameter shift-critical for aftermarket automotive integration. |
| Wettable Flank QFN | Enables automated optical inspection of solder joints on bottom-side pins-reduces field failure risk in high-reliability assemblies. |
| Frequency Spread Spectrum (FSS) | ±10% modulation at 15kHz suppresses narrowband EMI peaks, helping meet CISPR25 Class 5 conducted/radiated limits. |
| Low-Dropout (LDO) Mode | Maintains regulation down to VIN = VOUT + 0.1V during cold-crank, avoiding system brownout below 3.1V input. |
| Hiccup Over-Current Protection | Enters timed restart after fault clearance-prevents thermal runaway during sustained short-circuit conditions. |
Applications
| USB Chargers | Aftermarket Automotive Modules |
|---|---|
Use Scenario: Compact 12V-to-5V/3.3V conversion for dual-port vehicle-mounted USB-A/USB-C chargers. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated output with PG signaling for host microcontroller sequencing. Use Value: 42V load dump tolerance eliminates need for upstream TVS clamping; 1μA ISD extends battery backup runtime during ignition-off periods. | Use Scenario: Power supply for OBD-II dongles, dashcams, and HUD controllers operating directly from automotive battery rail. IC Role / Device Role / Timing Role: System PMIC providing clean, sequenced rails with cold-crank support and thermal fault reporting. Use Value: LDO mode sustains operation during engine cranking (3.1V min VIN); -40°C to +125°C TJ rating ensures reliability across full vehicle lifecycle. |
| Battery-Powered Telematics | Industrial Portable Instruments |
Use Scenario: Long-life power management for LTE/GPS asset trackers powered by Li-ion or LiFePO₄ cells. IC Role / Device Role / Timing Role: High-efficiency step-down converter enabling >5-year battery life in sleep mode with periodic wake-up bursts. Use Value: 20μA IQ and AAM light-load optimization reduce average current draw; QFN-12 footprint minimizes board area. | Use Scenario: Portable multimeters, handheld analyzers, and field calibration tools requiring stable 3.3V/5V rails from 9V or 12V batteries. IC Role / Device Role / Timing Role: Main DC/DC regulator with precise feedback (±0.75% VFB) and low-noise operation for analog front-end stability. Use Value: 0.8V FB reference and <±0.1% line/load regulation ensure measurement accuracy; CISPR25 compliance avoids EMI-induced reading errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4320GDE-AEC1-Z | AEC-Q100 Grade 1 qualified; identical electrical specs but validated for automotive production use. | Required for OEM-tier automotive designs; not needed for aftermarket or industrial use. | Select if qualification to AEC-Q100 is mandatory; otherwise MP4320GDE-Z offers same performance at lower cost. |
| TI TPS54332DR | 3.5V–28V input; no 42V load dump rating; 0.6A output; external MOSFETs required. | Lacks automotive transient robustness; suitable only for non-automotive 24V systems. | Choose only for non-automotive 24V applications where load dump immunity is irrelevant and external FET flexibility is preferred. |
Compared with MPQ4320GDE-AEC1-Z, the MP4320GDE-Z omits AEC-Q100 validation but retains identical electrical behavior and thermal performance; versus TPS54332DR, it integrates power FETs and adds 42V survivability-making it uniquely suited for unregulated automotive inputs.
Availability
MP4320GDE-Z is available at Aetrix Electronics and suitable for USB chargers, aftermarket automotive modules, battery-powered telematics, and portable instrumentation requiring stable component supply across extended temperature and transient-voltage conditions.
Supply support for MP4320GDE-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 MP4320 belongs to MPS's automotive-qualified buck converter product line, engineered specifically for robust operation in harsh 12V/24V vehicle environments-including load dump, cold crank, and wide ambient temperature extremes.
FAQ
What is the minimum input voltage required for startup?
The MP4320GDE-Z requires a minimum VIN of 3.9V to initiate startup due to its UVLO rising threshold of 3.4–3.9V. Once running, it sustains regulation down to 3.1V (cold-crank mode), enabled by low-dropout operation and internal bias circuitry that remains functional below typical UVLO falling thresholds.
How does the frequency foldback feature improve reliability?
During startup, frequency foldback reduces switching frequency under heavy load or low VIN conditions, preventing inductor current runaway by extending off-time and limiting peak current. This avoids saturation and thermal stress before regulation is established-particularly critical in automotive applications with large output capacitance.
Can the MP4320GDE-Z be used with fixed-output versions without external feedback resistors?
Yes. Fixed-output variants (e.g., MP4320GDE-33-Z for 3.3V) internally connect the FB pin to the output, eliminating external resistors. The MP4320GDE-Z is the adjustable version and requires an external resistor divider; selecting a fixed-output part simplifies layout and improves accuracy by removing resistor tolerance effects.
What is the purpose of the symmetric VIN pinout?
The dual VIN pins (pins 2 and 10) are placed symmetrically to balance high-current paths into the IC, reducing parasitic inductance and magnetic field asymmetry. This lowers radiated EMI and improves stability-especially critical for meeting CISPR25 Class 5 requirements in automotive EMC testing.
Does the device support forced PWM mode, or is it limited to AAM?
The MP4320GDE-Z operates exclusively in Advanced Asynchronous Modulation (AAM) mode-no forced PWM option is provided. AAM dynamically transitions between PWM and pulse-frequency modulation to maintain high efficiency across 10μA–500mA loads, eliminating audible noise and minimizing light-load quiescent current without external control signals.
How is thermal performance affected by the wettable flank package?
The wettable flank structure enables full-solder-joint inspection via AOI, ensuring consistent thermal interface quality. Combined with the exposed thermal pad and MeshConnect™ flip-chip construction, it achieves θJA = 35.5°C/W on the reference 4-layer EVB-directly improving power dissipation margin and long-term reliability in sealed enclosures.
What happens to the PG signal during thermal shutdown?
During thermal shutdown, the PG signal goes low (open-drain pulled down) because output regulation is lost-VOUT falls outside the 94.5%–105.5% window. PG resumes high only after junction temperature drops below TSD − TSD_HYS (≈155°C) and regulation is re-established, providing unambiguous fault indication to system controllers.
MP4320GDE-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:
- 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-Z FAQ
1.How can I place an order for MP4320GDE-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4320GDE-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 MP4320GDE-Z reliable?
The price and inventory of MP4320GDE-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4320GDE-Z is usually 5 days.
3.What payment methods are accepted for MP4320GDE-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4320GDE-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4320GDE-Z?
MP4320GDE-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4320GDE-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 MP4320GDE-Z?
For technical support, including MP4320GDE-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4320GDE-Z requirements.
6.How does Aetrix verify that MP4320GDE-Z is sourced from the original manufacturer or authorized distributors?
All MP4320GDE-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 MP4320GDE-Z meets industry standards.
7.What is the process for return or replacement of MP4320GDE-Z?
All MP4320GDE-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4320GDE-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 MP4320GDE-Z part is unused and in its original packaging.
Return procedure for MP4320GDE-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MP4320GDE-Z Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
