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Monolithic Power Systems Inc. MPQ4315GRE-AEC1-Z
- Part No.:
- MPQ4315GRE-AEC1-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 20-PowerVFQFN
- Datasheet:
-
MPQ4315GRE-AEC1-Z.pdf
- Description:
- IC REG BUCK ADJ 5A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,983
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Product details
Overview
MPQ4315GRE-AEC1-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated 48mΩ high-side and 20mΩ low-side MOSFETs, delivering up to 5A continuous output current across a 3.3V–45V input range. It features frequency spread spectrum (FSS), configurable 350–1000kHz switching, AEC-Q100 Grade 1 qualification, and 1.7μA shutdown quiescent current-designed for automotive infotainment power rails.
For engineers reviewing the MPQ4315GRE-AEC1-Z datasheet, MPQ4315GRE-AEC1-Z pinout, MPQ4315GRE-AEC1-Z application, or MPQ4315GRE-AEC1-Z equivalent, key selection criteria include cold-crank low-dropout mode, hiccup over-current protection, out-of-phase SYNC output for multi-phase operation, and wettable flank QFN-20 package compliance with automotive reflow and optical inspection requirements.
Technical Context
The MPQ4315 employs current-mode control with 100ns minimum on-time and frequency foldback at startup to prevent inductor current runaway. Its dual-mode light-load operation-Advanced Asynchronous Mode (AAM) or Forced Continuous Conduction Mode (FCCM)-is selected via the MODE pin and optimized for efficiency vs. ripple trade-offs in battery-sensitive systems.
Internal thermal shutdown (170°C) and robust protection suite-including open-drain power-good (PG) monitoring ±7% VREF window, hiccup OCP, and zero-current detection-enable fault-tolerant operation in harsh automotive environments where supply transients and extended temperature ranges (-40°C to +150°C TJ) are routine.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 45V - supports full automotive battery range including cold-crank (4.5V) and load-dump (40V+) |
| Output Current | 5A continuous - enables single-chip power delivery for 3.3V/5V domains in ADAS camera modules or cluster displays |
| Quiescent Current | 1.7μA in shutdown - preserves battery life during vehicle sleep modes (e.g., CAN wake-up standby) |
| Switching Frequency | Configurable 350–1000kHz via FREQ pin resistor - allows EMI optimization and inductor size reduction |
| Feedback Reference | 0.815V ±1.0% - enables precise output regulation with standard resistor divider networks |
| Thermal Shutdown | 170°C with 20°C hysteresis - prevents latch-up and ensures graceful recovery after overload events |
| EMI Performance | CISPR25 Class 5 compliant - meets stringent automotive radiated/conducted emissions limits without external shielding |
Pinout & Package
MPQ4315GRE-AEC1-Z uses a QFN-20 (4mm × 4mm) wettable flank package, enabling automated optical inspection (AOI) and reliable solder joint formation in automotive PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MODE | Light-load mode select | Pull high for FCCM (low-noise); pull low for AAM (high-efficiency); must not float |
| 2 SYNCIN | External clock input | Accepts 350–1000kHz sync signal; requires GND tie if unused to avoid floating |
| 3,12 VIN | Main power input | Supplies internal circuitry and power switches; requires local ceramic decoupling |
| 4,5,10,11 PGND | Power ground return | Low-impedance path for high di/dt switch currents; separate from AGND |
| 6 BST | Bootstrap supply | Drives high-side gate; requires capacitor between BST and SW per layout guidelines |
| 7,8 SW | Switch node | Connects to external inductor; high dv/dt node requiring tight loop layout |
| 9 EN | Enable control | Active-high logic; 0.85V threshold enables, 0.85V hysteresis prevents chatter |
| 13 SYNCO | Synchronization output | 180° out-of-phase clock; floats when unused; supports multi-phase interleaving |
| 14 PG | Power-good indicator | Open-drain output active when VOUT is 93–106% of nominal; requires external pull-up |
| 15 NC | No-connect terminal | Must be tied to VCC or ≥3V rail; never left floating |
| 16 VCC | Bias supply | Internally regulated 5V output; requires dedicated 1μF ceramic decoupling |
| 17 AGND | Analog ground | Reference for FB, SS, MODE; star-connected to PGND at single point |
| 18 FB | Feedback input | Monitors output via resistor divider; 0.815V reference sets VOUT = 0.815 × (1 + RUP/RDN) |
| 19 SS | Soft-start timing | 6μA current source charges external capacitor; controls ramp rate and inrush limiting |
| 20 FREQ | Frequency configuration | Resistor-to-GND sets fSW per published curve; enables EMI tuning without changing inductors |
Key Features
| Feature | Design Value |
|---|---|
| Frequency Spread Spectrum (FSS) | Reduces peak EMI amplitude by spreading energy across ~100kHz bandwidth-critical for CISPR25 Class 5 compliance |
| Low-Dropout Mode | Maintains regulation down to VIN ≈ VOUT + 0.5V-enables stable 5V output during 6V cold-crank conditions |
| Wettable Flank QFN-20 | Enables AOI-capable solder joints and IPC-A-610-compliant automotive assembly verification |
| Hiccup Over-Current Protection | Shuts down on sustained overload, then auto-retries-prevents thermal runaway while preserving system availability |
| Asymmetric VIN Layout Support | Optimized pin arrangement minimizes high-current loop area-reduces common-mode EMI without extra filtering |
Applications
| Automotive Infotainment Head Unit | ADAS Camera Module Power |
|---|---|
|
Use Scenario: Powers 3.3V SoC core and 5V display interface in head units exposed to 45V load-dump transients. IC Role / Device Role / Timing Role: Primary buck regulator with FSS and AEC-Q100 Grade 1 qualification for functional safety compliance. Use Value: Eliminates need for external EMI filters and discrete OVP clamps-reducing BOM count and board space by >30%. |
Use Scenario: Supplies 5V to image sensor and ISP in rear-view or surround-view cameras operating at -40°C to +105°C ambient. IC Role / Device Role / Timing Role: High-efficiency, low-IQ step-down converter with cold-crank dropout support and hiccup OCP. Use Value: Enables <1.7μA shutdown current for always-on vision systems-extending battery backup runtime to >72 hours. |
| Automotive Digital Cluster Display | Industrial Vehicle Telematics Unit |
|
Use Scenario: Generates 3.3V for MCU and 5V for backlight driver in TFT clusters subject to ISO 7637-2 pulse 5a/b transients. IC Role / Device Role / Timing Role: Synchronous buck with PG output for system-level power sequencing and fault reporting. Use Value: PG signal provides real-time VOUT validation to MCU-replacing external supervisor ICs and reducing firmware complexity. |
Use Scenario: Powers LTE modem, GNSS receiver, and CAN transceiver in ruggedized telematics gateways deployed in construction equipment. IC Role / Device Role / Timing Role: Automotive-grade DC/DC with wide VIN range and thermal shutdown for unregulated 24V vehicle batteries. Use Value: QFN-20 wettable flank package ensures solder joint reliability under 50g vibration-meeting ISO 16750-3 mechanical stress requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4316GRE-AEC1-Z | 6A output rating; identical pinout and feature set; higher RDS(on) HS-FET (42mΩ typical) | Supports higher current loads (e.g., multi-display clusters); slightly lower efficiency at 5A due to higher conduction loss | Select when future-proofing for >5A peak loads or when margin against thermal derating is required |
| TPS54560QDGQRQ1 | 5A, 60V max VIN; no FSS; external compensation; larger SOIC-8 package; no wettable flanks | Lacks CISPR25 Class 5 EMI certification; requires additional components for soft-start and PG functionality | Choose only if legacy design reuse or TI ecosystem integration outweighs EMI and footprint advantages of MPQ4315 |
Compared with MPQ4316GRE-AEC1-Z, this part offers tighter thermal performance at 5A and lower BOM cost; versus TPS54560QDGQRQ1, it delivers superior EMI behavior, smaller footprint, and integrated PG/FSS-reducing design validation effort for automotive Tier 1 programs.
Availability
MPQ4315GRE-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and digital instrument clusters requiring stable component supply with AEC-Q100 Grade 1 assurance and long-term production continuity.
Supply support for MPQ4315GRE-AEC1-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 over two decades of expertise in DC/DC conversion, motor drivers, and LED lighting solutions.
The MPQ4315 belongs to MPS's automotive-qualified MPQ series, engineered specifically for demanding vehicular power systems where efficiency, EMI control, and AEC-Q100 reliability are non-negotiable design requirements.
FAQ
What is the minimum recommended input voltage for reliable startup?
The MPQ4315 has a VIN UVLO rising threshold of 3.0V (typical), so startup is guaranteed above 3.2V. For cold-crank scenarios where battery dips to 4.5V, the low-dropout mode maintains regulation down to VIN ≈ VOUT + 0.5V-ensuring uninterrupted operation even below UVLO holdover.
How does the Advanced Asynchronous Mode (AAM) improve light-load efficiency?
AAM disables the low-side MOSFET during light loads and allows inductor current to decay to zero before restarting the switching cycle. This eliminates reverse conduction losses and reduces switching losses-achieving >85% efficiency at 1mA load, critical for always-on automotive subsystems.
Can the MPQ4315GRE-AEC1-Z be synchronized to an external clock while using Frequency Spread Spectrum?
No-FSS is disabled when SYNCIN receives an external clock signal. The device operates in fixed-frequency synchronized mode instead. FSS is only active in free-running oscillator mode (SYNCIN tied to GND).
What is the maximum allowable thermal resistance for a 5A continuous load at 85°C ambient?
With θJA = 44°C/W (QFN-20, JESD51-7), maximum power dissipation is 2.95W at TA = 85°C. At 5A output and 12V input, typical losses are ~1.1W-well within limit. For higher ambient or VIN, use the EVQ4315-R-00A evaluation board layout (θJA = 23°C/W) to maintain TJ < 150°C.
Is the NC pin (Pin 15) truly unused, or does it require biasing?
Pin 15 is not internally connected but must be tied to VCC or a ≥3V rail-never left floating. Leaving it unconnected risks noise coupling into adjacent analog pins (FB, SS, MODE) and may cause erratic soft-start or feedback behavior.
Does the power-good (PG) output indicate regulation status during low-dropout operation?
Yes-the PG window remains active (93–106% of nominal VOUT) regardless of operating mode. During low-dropout, the controller maintains regulation via reduced duty cycle, and PG asserts only when VOUT falls outside that band-providing consistent system-level fault signaling.
What is the recommended BST capacitor value and type for 5A operation?
A 0.1μF X7R ceramic capacitor placed directly between BST and SW is recommended. Its voltage rating must exceed VIN + 5.5V (e.g., 16V for 12V systems). Layout must minimize trace inductance-capacitor should be within 2mm of BST/SW pins per MPS AN-107 guidelines.
MPQ4315GRE-AEC1-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 20-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):
- 45V
- Voltage - Output (Min/Fixed):
- 0.815V
- Voltage - Output (Max):
- 42.75V
- Current - Output:
- 5A
- Frequency - Switching:
- 350kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 20-QFN (4x4)
MPQ4315GRE-AEC1-Z FAQ
1.How can I place an order for MPQ4315GRE-AEC1-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4315GRE-AEC1-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 MPQ4315GRE-AEC1-Z reliable?
The price and inventory of MPQ4315GRE-AEC1-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ4315GRE-AEC1-Z is usually 5 days.
3.What payment methods are accepted for MPQ4315GRE-AEC1-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4315GRE-AEC1-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4315GRE-AEC1-Z?
MPQ4315GRE-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4315GRE-AEC1-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 MPQ4315GRE-AEC1-Z?
For technical support, including MPQ4315GRE-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4315GRE-AEC1-Z requirements.
6.How does Aetrix verify that MPQ4315GRE-AEC1-Z is sourced from the original manufacturer or authorized distributors?
All MPQ4315GRE-AEC1-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 MPQ4315GRE-AEC1-Z meets industry standards.
7.What is the process for return or replacement of MPQ4315GRE-AEC1-Z?
All MPQ4315GRE-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4315GRE-AEC1-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 MPQ4315GRE-AEC1-Z part is unused and in its original packaging.
Return procedure for MPQ4315GRE-AEC1-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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