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Monolithic Power Systems Inc. MP4312GRE-Z
- Part No.:
- MP4312GRE-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 20-PowerVFQFN
- Datasheet:
-
MP4312GRE-Z.pdf
- Description:
- IC REG BUCK ADJ 2A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,795
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Product details
Overview
MP4312GRE-Z from Monolithic Power Systems is a 45V, 2A synchronous step-down DC/DC converter with integrated 48mΩ/20mΩ high-side/low-side MOSFETs, 1.7μA shutdown current, and frequency spread spectrum (FSS) for CISPR 25 Class 5 EMI compliance - designed for automotive infotainment power rails requiring cold-crank operation down to 3.3V input.
For engineers reviewing the MP4312GRE-Z datasheet, MP4312GRE-Z pinout, MP4312GRE-Z application, or MP4312GRE-Z equivalent, key selection criteria include its 350–1000kHz configurable switching frequency, AAM/FCCM mode selectability, 0.815V feedback threshold, and wettable-flank QFN-20 package for automated optical inspection in automotive PCB assembly.
Technical Context
The MP4312GRE-Z employs current-mode control with frequency foldback during start-up to prevent inductor current runaway and integrates thermal shutdown at 170°C with 20°C hysteresis. Its dual-mode operation supports Advanced Asynchronous Modulation (AAM) for light-load efficiency and Forced Continuous Conduction Mode (FCCM) for low-noise output regulation.
It features symmetric VIN routing and FSS modulation to reduce peak EMI emissions, an open-drain power-good (PG) output with ±5% window and 35µs delay, and external synchronization capability via SYNCIN/SYNCO pins for multi-phase or noise-sensitive system timing coordination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 45V - supports full automotive battery range including cold-crank (≥3.3V) and load-dump transients. |
| Output Current | 2A continuous - sufficient for powering SoCs, DSPs, or display controllers in head units and telematics modules. |
| Quiescent Current | 18μA in sleep mode - enables >1-year battery hold-up in always-on vehicle subsystems without parasitic drain. |
| Switching Frequency | 350kHz–1000kHz, configurable via FREQ pin resistor - allows optimization for size (higher fSW) or efficiency (lower fSW) and EMI filtering design. |
| Feedback Voltage | 0.815V ±12mV - sets precise output regulation; enables adjustable VOUT from 0.815V up to 0.95×VIN using external resistor divider. |
| EMI Performance | CISPR 25 Class 5 compliant - meets stringent automotive radiated/conducted emission limits without additional shielding in typical layout. |
| Thermal Protection | 170°C shutdown with 20°C hysteresis - ensures fault-tolerant operation under sustained overload or poor heatsinking conditions. |
Pinout & Package
MP4312GRE-Z is housed in a wettable-flank QFN-20 (4mm × 4mm) package, enabling reliable solder-joint inspection in automotive-grade reflow processes. Thermal resistance θJA = 44°C/W on standard 4-layer JEDEC board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MODE | Mode selection | Logic-high enables FCCM; logic-low enables AAM - determines light-load efficiency vs. output ripple trade-off. |
| 2 SYNCIN | External clock input | Accepts 350–1000kHz sync signal; enables multi-phase interleaving or noise-frequency coordination with other converters. |
| 3,12 VIN | Main input supply | Supplies internal circuitry and HS-FET; requires local ceramic decoupling to PGND for stable switching. |
| 4,5,10,11 PGND | Power ground return | Low-impedance path for switch node current; must be connected to solid ground plane beneath IC footprint. |
| 6 BST | Bootstrap supply | Connects to SW via 0.1μF ceramic capacitor; powers HS-FET gate driver during high-side conduction. |
| 7,8 SW | Switch node | Drives external inductor; voltage swings between VIN and ~−0.3V; requires short, low-inductance trace to minimize ringing. |
| 9 EN | Enable control | Active-high enable with 1V rising threshold; supports controlled power sequencing in multi-rail systems. |
| 13 SYNCO | Synchronized clock output | 180° out-of-phase with internal oscillator or inverted SYNCIN - enables phase-shifted multi-converter operation. |
| 14 PG | Power-good indicator | Open-drain output pulled high when VOUT is within 95–105% of target - used for system reset or downstream enable sequencing. |
| 15 NC | No connect | Must remain unconnected; no internal connection or function. |
| 16 VCC | Bias supply | Internal LDO output; requires 1μF ceramic decoupling to AGND for stable gate drive and control logic. |
| 17 AGND | Analog ground | Reference for FB, SS, MODE, and internal error amplifier - must be tied to PGND at single point near VCC capacitor. |
| 18 FB | Feedback input | Monitors output via resistor divider; 0.815V reference enables accurate VOUT programming and line/load regulation. |
| 19 SS | Soft-start control | Capacitor-based ramp controls inrush current; 13μA current source sets tSS = 13μA × CSS for controlled startup. |
| 20 FREQ | Frequency setting | Resistor-to-AGND sets fSW per curve on datasheet page 15 - enables precise EMI band placement and filter design. |
Key Features
| Feature | Design Value |
|---|---|
| Frequency Spread Spectrum (FSS) | Reduces peak conducted/radiated EMI by spreading switching energy across 20–30kHz bandwidth - eliminates need for large EMI filters in space-constrained automotive modules. |
| Low-Dropout (LDO) Mode | Enables regulation down to VIN − VOUT < 1V during cold-crank - maintains 5V/3.3V rail stability even when battery drops to 6V. |
| Out-of-Phase SYNCO Output | Provides 180° phase-shifted clock for interleaved multi-phase designs - cuts input/output ripple by up to 50% versus single-phase operation. |
| Advanced Asynchronous Modulation (AAM) | Skips pulses under light load to maintain >85% efficiency at 1mA - critical for always-on vehicle networks with microamp-level standby requirements. |
| Wettable Flank QFN-20 | Exposed side-plated leads enable AOI-compatible solder-joint inspection - satisfies IPC-A-610 Class 3 reliability requirements for automotive production. |
Applications
| Radios & Infotainment Head Units | Battery-Powered Telematics Modules |
|---|---|
Use Scenario: Powering AM/FM/DAB tuners, audio codecs, and touch-display controllers in automotive head units with wide input voltage variation. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck regulator delivering 2A with fast transient response to handle burst-mode DSP loads. Use Value: FSS and symmetric VIN routing meet CISPR 25 Class 5 emissions limits without added ferrites or shields, reducing BOM cost and board area. | Use Scenario: Supplying GNSS receivers, cellular modems, and CAN transceivers in always-on vehicle tracking devices powered by 12V lead-acid or LiFePO₄ batteries. IC Role / Device Role / Timing Role: Main system PMIC with ultra-low 1.7μA shutdown current and AAM mode for sub-20μA system standby. Use Value: 3.3V to 45V input range accommodates battery voltage drift and jump-start transients while maintaining regulated output. |
| Industrial Vehicle Control Units | ADAS Camera Power Supplies |
Use Scenario: Providing isolated 5V/3.3V rails for microcontrollers, sensors, and CAN FD interfaces in heavy-duty truck ECUs operating in harsh thermal environments. IC Role / Device Role / Timing Role: High-reliability buck converter with 125°C junction rating and thermal shutdown at 170°C for extended life in engine bay locations. Use Value: Wettable flank QFN-20 package ensures solder-joint integrity during thermal cycling, meeting AEC-Q200 stress test requirements. | Use Scenario: Generating clean 1.2V/1.8V core supplies for image signal processors (ISPs) and MIPI CSI-2 serializers in rear-view and surround-view cameras. IC Role / Device Role / Timing Role: Secondary buck stage following primary 12V→5V conversion, optimized for low noise and fast load-step response. Use Value: FCCM mode eliminates low-frequency ripple that could couple into analog video paths, preserving image SNR. |
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 |
|---|---|---|---|
| MPQ4312GR-A | AEC-Q100 qualified version with same electrical specs and pinout; includes enhanced ESD protection and extended temperature validation. | Required for safety-critical automotive domains (e.g., powertrain, ADAS) where AEC-Q100 Grade 1 qualification is mandated. | Select MPQ4312GR-A when functional safety compliance (ISO 26262 ASIL-B ready) and automotive qualification documentation are required. |
| LM61480RGER | TI part with 3.5V–36V input, 8A output, 12μA IQ, but no FSS or wettable flank; uses different pinout and control architecture (constant-on-time). | Suitable for non-automotive industrial applications needing higher current, but lacks CISPR 25 compliance and automotive package features. | Choose LM61480RGER only for cost-sensitive, non-automotive designs where 2A output and FSS are not required. |
Compared with MPQ4312GR-A, the MP4312GRE-Z offers identical performance in non-automotive contexts but lacks AEC-Q100 certification; versus LM61480RGER, it delivers superior EMI performance and automotive-specific packaging at lower output current - making it optimal for cost-constrained infotainment and telematics designs.
Availability
MP4312GRE-Z is available at Aetrix Electronics and suitable for automotive infotainment systems, battery-powered telematics modules, and industrial vehicle control units requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MP4312GRE-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 MP4312 belongs to MPS's automotive-qualified buck converter product line, engineered specifically for demanding vehicle environments - emphasizing low EMI, cold-crank operation, and robust thermal behavior in compact packages.
FAQ
What is the minimum input voltage supported by MP4312GRE-Z during cold-crank conditions?
The MP4312GRE-Z operates down to 3.3V input, with UVLO rising threshold at 3.0V and hysteresis of 280mV. This ensures reliable startup and regulation even when automotive battery voltage dips to 6V during cranking, thanks to its low-dropout mode and wide VIN range.
How does the Frequency Spread Spectrum (FSS) feature reduce EMI in automotive applications?
FSS modulates the switching frequency by ±10–15kHz around the nominal value, spreading spectral energy across a wider bandwidth. This lowers peak emissions by 5–10dB compared to fixed-frequency operation - enabling compliance with CISPR 25 Class 5 without adding bulky EMI filters or shielding cans.
Can MP4312GRE-Z synchronize with external clock sources, and what is the acceptable frequency range?
Yes - the SYNCIN pin accepts external clocks from 350kHz to 1000kHz with TTL-compatible thresholds (0.4V/1.8V). It supports multiphase interleaving and noise-frequency coordination, and the SYNCO pin outputs a 180° phase-shifted copy for precise timing alignment across multiple converters.
What is the purpose of the MODE pin, and how does AAM mode improve light-load efficiency?
The MODE pin selects between FCCM (forced continuous conduction) and AAM (advanced asynchronous modulation). In AAM, the LS-FET turns off when inductor current reaches zero, eliminating reverse recovery losses and reducing switching losses - achieving >85% efficiency at 1mA load with 18μA quiescent current.
Is the MP4312GRE-Z RoHS-compliant and halogen-free?
Yes - MP4312GRE-Z is fully RoHS-compliant, lead-free, and halogen-free per IEC 61249-2-21. It meets JEDEC MSL Level 1 moisture sensitivity rating and is qualified for reflow per J-STD-020, with wettable flank leads supporting automated optical inspection in high-reliability automotive assembly lines.
What thermal derating guidance applies when operating above 25°C ambient?
With θJA = 44°C/W on standard 4-layer board, maximum continuous power dissipation drops linearly: PD(MAX) = (150°C − TA)/44°C/W. At 85°C ambient, max dissipation is ~1.48W - corresponding to ~1.5A at 12V input/5V output. For higher loads, use EVQ4312-R-00A reference layout (θJA = 23°C/W) or add copper thermal pads.
Does MP4312GRE-Z support output voltages below 0.815V?
No - the internal feedback reference is fixed at 0.815V ±12mV. Output voltage is set by VOUT = 0.815V × (1 + RFB_PU/RFB_PD), so minimum programmable VOUT equals the reference voltage. For sub-0.8V rails, an external reference or post-regulator is required.
MP4312GRE-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):
- 42.25V
- Current - Output:
- 2A
- 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)
MP4312GRE-Z FAQ
1.How can I place an order for MP4312GRE-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP4312GRE-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 MP4312GRE-Z reliable?
The price and inventory of MP4312GRE-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4312GRE-Z is usually 5 days.
3.What payment methods are accepted for MP4312GRE-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4312GRE-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP4312GRE-Z?
MP4312GRE-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP4312GRE-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 MP4312GRE-Z?
For technical support, including MP4312GRE-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4312GRE-Z requirements.
6.How does Aetrix verify that MP4312GRE-Z is sourced from the original manufacturer or authorized distributors?
All MP4312GRE-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 MP4312GRE-Z meets industry standards.
7.What is the process for return or replacement of MP4312GRE-Z?
All MP4312GRE-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4312GRE-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 MP4312GRE-Z part is unused and in its original packaging.
Return procedure for MP4312GRE-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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