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Monolithic Power Systems Inc. MP4315GRE-Z
- Part No.:
- MP4315GRE-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 20-PowerVFQFN
- Datasheet:
-
MP4315GRE-Z.pdf
- Description:
- IC REG BUCK ADJ 5A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,613
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Product details
Overview
MP4315GRE-Z from Monolithic Power Systems is a 45V, 5A synchronous step-down DC/DC converter with integrated high-side (48mΩ) and low-side (20mΩ) MOSFETs, frequency spread spectrum (FSS), power good indication, and configurable 350–1000kHz switching frequency. It delivers high efficiency across load ranges via light-load frequency foldback and supports automotive cold-crank operation with low-dropout mode. Used in battery-powered radios and industrial power systems requiring stable 3.3V/5V rails.
For engineers reviewing the MP4315GRE-Z datasheet, MP4315GRE-Z pinout, MP4315GRE-Z application, or MP4315GRE-Z equivalent, key selection considerations include its 1.7μA shutdown current, 100ns minimum on-time, AAM/FCCM mode selectability, wettable flank QFN-20 package for solder inspection, and CISPR25 Class 5 EMI compliance in automotive layouts.
Technical Context
The MP4315GRE-Z employs current-mode control with fast loop response and integrates both power switches, eliminating external FETs. Its internal architecture supports out-of-phase synchronized clock output (SYNCO) and external clock synchronization (SYNCIN) for multi-phase designs.
It implements advanced protection including hiccup over-current, thermal shutdown at 170°C, and precise power-good monitoring (93–106% VREF window with 35μs delay). Frequency foldback prevents inductor current runaway during startup, while symmetric VIN routing and FSS reduce conducted and radiated EMI per CISPR25 Class 5.
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 | 5A continuous - enables single-chip 3.3V/5V supply for infotainment and ADAS subsystems. |
| Shutdown Current | 1.7μA - extends battery life in always-on vehicle modules like telematics and remote keyless entry. |
| Switching Frequency | 350–1000kHz configurable via resistor - allows EMI optimization and inductor size trade-offs. |
| Power Good Threshold | 93–106% of 0.815V feedback reference - provides reliable rail validation with ±7% hysteresis for noise immunity. |
| FSS & EMI Performance | Meets CISPR25 Class 5 peak/average conducted and radiated emissions - reduces need for external filtering in automotive PCBs. |
| Thermal Protection | 170°C shutdown with 20°C hysteresis - ensures fault-tolerant operation under sustained overload or poor heatsinking. |
Pinout & Package
MP4315GRE-Z is housed in a QFN-20 (4mm × 4mm) wettable flank package, enabling automated optical solder-joint inspection for automotive-grade assembly reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MODE | Light-load operation mode select | Pull high for FCCM (fixed-frequency); pull low for AAM (discontinuous conduction) to optimize light-load efficiency. |
| 2 SYNCIN | External clock input | Accepts 350–1000kHz sync signal; enables multi-phase interleaving or EMI reduction via frequency locking. |
| 3,12 VIN | Main power input | Supplies control circuitry and power switches; requires local ceramic decoupling to suppress switching spikes. |
| 4,5,10,11 PGND | Power ground return | Low-impedance path for high di/dt switch currents; must be connected to solid ground plane beneath IC. |
| 6 BST | Bootstrap supply | Drives high-side gate; requires 0.1μF ceramic capacitor between BST and SW for proper gate drive voltage generation. |
| 7,8 SW | Switch node | Connects to inductor and BST capacitor; high dv/dt node requiring minimized trace area and guard ring. |
| 9 EN | Enable control | Active-high logic: >1V enables, <0.85V shuts down; 190mV hysteresis prevents chatter near threshold. |
| 13 SYNCO | Synchronized clock output | 180° out-of-phase with internal oscillator or SYNCIN; used for phase-interleaved multi-converter systems. |
| 14 PG | Power good indicator | Open-drain output; requires external pull-up; asserts high when VOUT is within 93–106% of target. |
| 15 NC | No-connect terminal | Must be tied to VCC or ≥3V output; floating causes undefined behavior per datasheet requirement. |
| 16 VCC | Bias supply rail | Internally regulated 4.9V; powers gate drivers and control logic; requires dedicated 1μF decoupling. |
| 17 AGND | Analog ground reference | Separate from PGND; connects to FB, SS, MODE, and other analog pins to minimize noise coupling. |
| 18 FB | Feedback input | Monitors output via resistor divider; 0.815V reference enables adjustable VOUT from 0.815V to 0.95×VIN. |
| 19 SS | Soft-start timing | 6μA current source charges external capacitor; controls ramp rate of output voltage to limit inrush current. |
| 20 FREQ | Frequency configuration | Resistor-to-ground sets fSW (e.g., 62kΩ → 470kHz); enables precise EMI tuning without changing layout. |
Key Features
| Feature | Design Value |
|---|---|
| Wettable flank QFN-20 | Enables AOI-compatible solder joint inspection for zero-defect automotive manufacturing. |
| Frequency spread spectrum (FSS) | Reduces peak EMI amplitude by spreading energy across ~100kHz bandwidth, easing CISPR25 Class 5 compliance. |
| Selectable AAM/FCCM modes | AAM improves light-load efficiency (>85% at 1mA); FCCM maintains fixed frequency for predictable EMI and transient response. |
| Low-dropout mode | Maintains regulation down to VIN – VOUT = 0.5V, critical for automotive cold-crank (e.g., 6V input → 5V output). |
| Hiccup over-current protection | Shuts down on current limit violation, then auto-retries - prevents thermal runaway during short-circuit faults. |
| Symmetric VIN routing | Minimizes high-di/dt loop area between VIN and PGND pins, reducing magnetic field radiation at fundamental switching frequency. |
Applications
| Automotive Infotainment Power | Radios & Telematics Modules |
|---|---|
|
Use Scenario: Powering 3.3V DSP, 5V display interface, and CAN transceivers in head units under 12V/24V battery input with cold-crank dips to 6V. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 3.3V/5V rails with power-good sequencing and EMI-controlled switching. Use Value: Low 1.7μA shutdown current preserves battery during vehicle sleep; FSS and symmetric VIN meet OEM EMI requirements without added filters. |
Use Scenario: Supplying 5V to LTE/Wi-Fi modems and GNSS receivers in connected car gateways where RF sensitivity demands ultra-low noise. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with AAM mode minimizing idle power and SYNCO enabling multi-rail synchronization. Use Value: 100ns minimum on-time supports high VIN/VOUT ratios (e.g., 45V→5V); wettable flank package ensures IPC-A-610 Class 3 solder integrity. |
| Industrial Battery Systems | General-Purpose Consumer Power |
|
Use Scenario: Providing 3.3V to microcontrollers and sensors in portable test equipment powered by 12–36V Li-ion packs. IC Role / Device Role / Timing Role: Synchronous buck converter managing wide-input battery discharge curves while maintaining tight output regulation. Use Value: 18μA sleep-mode IQ extends runtime; thermal shutdown and hiccup OCP protect against cell imbalance or connector faults. |
Use Scenario: Generating 5V for USB peripherals and 3.3V for MCU logic in smart home hubs operating from 12V wall adapters. IC Role / Device Role / Timing Role: Compact, integrated DC/DC solution replacing discrete buck controllers + external MOSFETs. Use Value: QFN-20 footprint saves board space; configurable frequency avoids interference with wireless bands (e.g., 2.4GHz Wi-Fi). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4315GRE-A | Automotive-grade variant (AEC-Q100 qualified), same electrical specs, enhanced HTOL and temperature cycling performance. | Required for safety-critical automotive ECUs; not necessary for industrial or consumer use. | Select MPQ4315GRE-A only if AEC-Q100 qualification is mandated; MP4315GRE-Z suffices for non-automotive applications. |
| LM61480RQR | TI part with 3.3–36V input, 8A output, 1.5μA shutdown IQ, but no FSS or wettable flank package. | Lacks CISPR25 Class 5 EMI features; requires external EMI filters in automotive designs. | Choose LM61480RQR only if higher current (8A) is needed and EMI filtering budget allows added BOM cost and board area. |
Compared with MPQ4315GRE-A, the MP4315GRE-Z offers identical core functionality at lower cost and qualification overhead, while the LM61480RQR trades EMI integration for higher current and different input range-making MP4315GRE-Z optimal for cost-sensitive, EMI-constrained 5A automotive and industrial buck applications.
Availability
MP4315GRE-Z is available at Aetrix Electronics and suitable for automotive infotainment, industrial battery systems, and consumer electronics requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MP4315GRE-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 MP4315 belongs to MPS's automotive-qualified buck converter product line, engineered specifically for harsh-environment applications demanding low IQ, robust EMI control, and extended input voltage range.
FAQ
What is the minimum recommended output capacitor for stable operation?
The MP4315GRE-Z requires ≥22μF total output capacitance with ≤10mΩ ESR for stability across load and temperature. Ceramic capacitors are preferred; typical designs use two 10μF X5R 0805s in parallel to meet ripple and ESR targets while minimizing board area.
Can the MP4315GRE-Z operate without an external bootstrap capacitor?
No. A 0.1μF ceramic capacitor must be placed between BST and SW pins. Omitting it prevents proper high-side gate drive, causing immediate failure to regulate and potential damage due to shoot-through or excessive RDS(on) heating.
How does the MODE pin affect light-load efficiency?
In AAM (MODE = low), the converter skips pulses under light loads, reducing switching losses and achieving >85% efficiency at 1mA. In FCCM (MODE = high), it maintains fixed frequency, improving transient response but lowering light-load efficiency by ~10–15%.
Is the PG pin compatible with 3.3V logic systems?
Yes. The open-drain PG pin can be pulled up to any voltage ≤5.5V. For 3.3V systems, use a 10kΩ resistor to 3.3V; PG sinks <1mA when low and presents high impedance when high, ensuring clean interfacing with MCU GPIOs.
What thermal derating applies above 25°C ambient?
Using θJA = 44°C/W (4-layer board), maximum continuous output current drops linearly: at 85°C ambient, max output is ~3.5A; at 105°C, ~2.7A. Derating is accelerated above 100°C due to thermal shutdown activation at 170°C junction temperature.
Does the FREQ pin require a precision resistor?
A standard 1% tolerance resistor is sufficient. The fSW vs. RFREQ curve shows ±5% frequency variation across process and temperature; 62kΩ yields 470kHz ±30kHz, adequate for EMI tuning and avoiding sensitive frequency bands.
Can SYNCIN and SYNCO be used simultaneously in a dual-phase configuration?
Yes. One MP4315GRE-Z accepts an external clock on SYNCIN; its SYNCO output drives the SYNCIN of a second device, creating 180° phase offset for interleaved operation that cuts input/output ripple current by ~50%.
MP4315GRE-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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 20-QFN (4x4)
MP4315GRE-Z FAQ
1.How can I place an order for MP4315GRE-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4315GRE-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 MP4315GRE-Z reliable?
The price and inventory of MP4315GRE-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4315GRE-Z is usually 5 days.
3.What payment methods are accepted for MP4315GRE-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4315GRE-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4315GRE-Z?
MP4315GRE-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4315GRE-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 MP4315GRE-Z?
For technical support, including MP4315GRE-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4315GRE-Z requirements.
6.How does Aetrix verify that MP4315GRE-Z is sourced from the original manufacturer or authorized distributors?
All MP4315GRE-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 MP4315GRE-Z meets industry standards.
7.What is the process for return or replacement of MP4315GRE-Z?
All MP4315GRE-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4315GRE-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 MP4315GRE-Z part is unused and in its original packaging.
Return procedure for MP4315GRE-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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