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Monolithic Power Systems Inc. MP4317GRE-Z
- Part No.:
- MP4317GRE-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 20-PowerVFQFN
- Datasheet:
-
MP4317GRE-Z.pdf
- Description:
- IC REG BUCK ADJ 7A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,772
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Product details
Overview
MP4317GRE-Z from Monolithic Power Systems is a 45V, 7A synchronous step-down DC/DC converter with integrated 48mΩ high-side and 20mΩ low-side MOSFETs, frequency spread spectrum (FSS) for EMI reduction, and 1.7μA shutdown current-designed for automotive cold-crank and battery-powered systems requiring stable 5V/3.3V rails.
For engineers reviewing the MP4317GRE-Z datasheet, MP4317GRE-Z pinout, MP4317GRE-Z application, or MP4317GRE-Z equivalent, key selection criteria include its 3.3–45V input range, configurable 350–1000kHz switching frequency, AAM/FCCM mode selection, wettable-flank QFN-20 package, and integrated PG signal for power-rail monitoring in harsh environments.
Technical Context
The MP4317GRE-Z implements current-mode control with fast loop response and supports both advanced asynchronous modulation (AAM) for light-load efficiency and forced continuous conduction mode (FCCM) for fixed-frequency operation. Its 100ns minimum on-time enables high VIN/VOUT ratios, while frequency foldback prevents inductor current runaway during startup.
It integrates symmetric VIN routing and FSS to suppress peak EMI emissions, achieving CISPR25 Class 5 compliance in typical layouts. Thermal shutdown (170°C) and hiccup-mode over-current protection ensure fault-tolerant operation across automotive (-40°C to +125°C) and industrial temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 45V - supports wide automotive battery transients including cold-crank down to 3.3V |
| Output Current | Up to 7A continuous - delivered via integrated 48mΩ/20mΩ HS/LS MOSFETs with low conduction loss |
| Quiescent Current | 18μA in sleep mode - enables >1-year battery life in always-on IoT sensors |
| Switching Frequency | Configurable 350–1000kHz via external resistor - allows optimization for size (high fSW) or efficiency (low fSW) |
| Feedback Voltage | 0.815V ±8mV - sets precise output voltage with standard resistor dividers |
| Power Good Threshold | 95–105% of VOUT nominal - provides reliable rail-valid indication with 35μs delay |
| Min On-Time | 100ns - supports high step-down ratios (e.g., 45V→3.3V at 470kHz) |
Pinout & Package
MP4317GRE-Z is housed in a wettable-flank QFN-20 (4mm × 4mm) package with exposed thermal pad for enhanced heat dissipation in high-power density designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MODE | Mode selection | High = FCCM (fixed-frequency); Low = AAM (pulse-skipping) - must be pulled, not floated |
| 2 SYNCIN | External clock input | Accepts 350–1000kHz sync signal; internal Hi-Z requires ≤51kΩ pull-down if unused |
| 3,12 VIN | Main input supply | Powers control circuitry and HS-FET; requires local decoupling to PGND |
| 4,5,10,11 PGND | Power ground | Low-impedance return path for high di/dt switch node currents |
| 6 BST | Bootstrap supply | Drives HS-FET gate; requires capacitor between BST and SW pins |
| 7,8 SW | Switch node | Connects internal HS/LS FETs; critical for layout to minimize EMI and ringing |
| 9 EN | Enable control | Active-high (1V threshold); enables/disables regulation and soft-start |
| 13 SYNCO | Synchronous clock output | 180° out-of-phase with internal oscillator or inverted SYNCIN - float if unused |
| 14 PG | Power good indicator | Open-drain output; pulled high when VOUT is within ±5% of target |
| 15 NC | No connect | Not internally bonded - leave unconnected |
| 16 VCC | Bias supply | Internal 4.9V regulator output; requires local decoupling to AGND |
| 17 AGND | Analog ground | Reference for FB, SS, MODE, SYNCIN; separate from PGND for noise immunity |
| 18 FB | Feedback input | Monitors output via resistor divider; 0.815V reference enables precise VOUT setting |
| 19 SS | Soft-start timing | Capacitor-to-AGND sets ramp time; 13μA current limits inrush current |
| 20 FREQ | Frequency setting | Resistor-to-AGND selects fSW (e.g., 62kΩ → 470kHz) |
Key Features
| Feature | Design Value |
|---|---|
| Frequency Spread Spectrum (FSS) | Reduces peak EMI by spreading switching energy across a band - enables CISPR25 Class 5 compliance without added filters |
| Low-Dropout Mode | Maintains regulation during automotive cold-crank (VIN < VOUT × duty cycle) - avoids system brownout |
| Out-of-Phase SYNCO Output | Enables interleaved multi-phase operation with second MP4317 - cuts input/output ripple by up to 50% |
| Wettable Flank QFN | Facilitates automated optical inspection (AOI) of solder joints - improves manufacturing yield in automotive PCB assembly |
| Thermal Shutdown with Hysteresis | Triggers at 170°C with 20°C hysteresis - prevents thermal cycling damage during overload conditions |
Applications
| Automotive Infotainment | Radios & Telematics |
|---|---|
Use Scenario: Powering DSP, display, and audio subsystems in head units under 12V/24V battery input with cold-crank dips to 3.3V. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 5V/3.3V rails with PG monitoring and FSS-enabled EMI control. Use Value: Maintains uninterrupted operation during engine start; meets OEM EMC requirements without external spread-spectrum ICs. |
Use Scenario: Supplying RF front-end, baseband processors, and GPS modules in vehicle-mounted communication systems. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC converter with synchronized clock output for multi-rail coordination. Use Value: Enables clean power delivery to sensitive analog/RF circuits; SYNCO allows phase-aligned sequencing with companion converters. |
| Industrial Battery-Powered Sensors | Portable Medical Devices |
Use Scenario: Long-life remote monitoring nodes powered by Li-ion or 4xAA batteries requiring ultra-low IQ and robust load transient response. IC Role / Device Role / Timing Role: Primary step-down regulator operating in AAM mode for sub-100μA quiescent current at no load. Use Value: Extends battery runtime beyond 12 months; 1.7μA shutdown current minimizes leakage in deep-sleep states. |
Use Scenario: Powering microcontrollers, ADCs, and wireless transceivers in handheld diagnostic tools with strict EMI and safety margins. IC Role / Device Role / Timing Role: Certified-compliant buck converter with hiccup-mode OCP and thermal shutdown for patient-safe operation. Use Value: Prevents thermal hazard during extended use; PG signal validates rail integrity before enabling critical functions. |
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 |
|---|---|---|---|
| MPQ4317GRE-A | Automotive-grade (AEC-Q100 Grade 1), same electrical specs but qualified for -40°C to +125°C junction temp with enhanced reliability testing | Required for production automotive ECUs; not needed for industrial or consumer designs | Select MPQ4317GRE-A only when AEC-Q100 qualification is mandated by end-equipment standards |
| LM61480RQR | TI part with 3.3–36V input, 8A rating, 12μA IQ, but no FSS or wettable flank; uses different pinout and control architecture | Lacks integrated EMI mitigation - requires external filtering for CISPR25; incompatible footprint and layout | Choose LM61480RQR only if TI ecosystem alignment or higher output current outweighs EMI and manufacturability trade-offs |
Compared with MPQ4317GRE-A, the MP4317GRE-Z offers identical performance at lower cost and qualification overhead for non-automotive use; versus LM61480RQR, it delivers superior EMI performance and AOI-friendly packaging but requires MPS-specific design practices.
Availability
MP4317GRE-Z is available at Aetrix Electronics and suitable for automotive infotainment, industrial battery-powered sensors, and portable medical devices requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MP4317GRE-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 and global distribution.
The MP4317 belongs to MPS's automotive-qualified DC/DC converter product line, engineered specifically for harsh-environment applications demanding wide VIN range, low EMI, and high reliability in space-constrained layouts.
FAQ
What is the maximum recommended PCB copper weight for thermal performance?
The MP4317GRE-Z achieves optimal thermal performance on 4-layer boards with 2oz copper on inner layers, per MPS EVQ4317-R-00A evaluation board spec. Using ≥2oz copper on PGND and thermal pad layers reduces θJA to 23°C/W, enabling full 7A output at +85°C ambient without derating.
Can the MP4317GRE-Z operate without an external bootstrap diode?
Yes-the MP4317GRE-Z integrates an internal bootstrap diode, eliminating the need for an external component. The BST pin connects directly to a capacitor between BST and SW; no external diode or resistor is required unless using ultra-low-ESR ceramic capacitors where charge injection may cause instability.
How does the FSS function interact with external synchronization?
When SYNCIN is active, FSS is automatically disabled-the device locks to the external clock and operates at fixed frequency. FSS only engages in free-running mode (SYNCIN floating or grounded). This ensures deterministic timing when synchronizing multiple converters while retaining EMI benefits in standalone operation.
What is the minimum output capacitance required for stability?
MPS specifies a minimum 22μF ceramic output capacitor (X7R, 10V rating) with ≤5mΩ ESR for stable operation across all loads and input voltages. Lower capacitance risks loop instability and excessive output ripple, especially under dynamic load steps above 1A/μs.
Is the PG pin compatible with 1.8V logic systems?
Yes-the open-drain PG pin can be pulled up to any voltage from 1.8V to 5.5V. When VOUT is in regulation, PG pulls high to the pull-up rail; sinking capability is rated for 1mA at 0.3V max. This allows direct interfacing with low-voltage MCUs without level-shifting.
Does the MP4317GRE-Z support output voltages below 0.815V?
No-the internal feedback reference is fixed at 0.815V. Output voltages below this require external amplification (e.g., op-amp-based feedback scaling), which degrades accuracy and transient response. For sub-0.8V rails, consider MPS's MPQ4470 or similar adjustable-reference converters.
What failure modes trigger hiccup-mode over-current protection?
Hiccup-mode OCP activates when valley current exceeds 8–12A (typical) in AAM mode or reverse current exceeds 2–7A in FCCM mode. After triggering, the device shuts down for ~3ms, then attempts restart-repeating until fault clears. This prevents thermal runaway during short-circuit or overload events.
MP4317GRE-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:
- 7A
- Frequency - Switching:
- 350kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 20-QFN (4x4)
MP4317GRE-Z FAQ
1.How can I place an order for MP4317GRE-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4317GRE-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 MP4317GRE-Z reliable?
The price and inventory of MP4317GRE-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4317GRE-Z is usually 5 days.
3.What payment methods are accepted for MP4317GRE-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4317GRE-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4317GRE-Z?
MP4317GRE-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4317GRE-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 MP4317GRE-Z?
For technical support, including MP4317GRE-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4317GRE-Z requirements.
6.How does Aetrix verify that MP4317GRE-Z is sourced from the original manufacturer or authorized distributors?
All MP4317GRE-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 MP4317GRE-Z meets industry standards.
7.What is the process for return or replacement of MP4317GRE-Z?
All MP4317GRE-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4317GRE-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 MP4317GRE-Z part is unused and in its original packaging.
Return procedure for MP4317GRE-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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