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Monolithic Power Systems Inc. MPQ2178GQHE-12-AEC1-Z
- Part No.:
- MPQ2178GQHE-12-AEC1-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-VFDFN
- Datasheet:
-
MPQ2178GQHE-12-AEC1-Z.pdf
- Description:
- IC REG BUCK 1.2V 2A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,713
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Product details
Overview
MPQ2178GQHE-12-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, synchronous step-down DC/DC converter delivering 2A continuous output at fixed 1.2V from 2.5V–6V input. It integrates 70mΩ P-channel and 40mΩ N-channel MOSFETs, employs constant-on-time (COT) control with VIN feed-forward for 2.4MHz stable switching, and features power good (PG), external soft start (SS), and output discharge-designed for automotive infotainment power rails.
For engineers reviewing the MPQ2178GQHE-12-AEC1-Z datasheet, MPQ2178GQHE-12-AEC1-Z pinout, MPQ2178GQHE-12-AEC1-Z application, or MPQ2178GQHE-12-AEC1-Z equivalent, key selection criteria include its 1.2V ±2% output accuracy over –40°C to +150°C junction temperature, wettable flank QFN-8 (1.5mm×2mm) package for automated optical inspection, FCCM operation across full load, and integrated protection including hiccup-mode short-circuit and thermal shutdown.
Technical Context
The MPQ2178GQHE-12-AEC1-Z implements a constant-on-time (COT) control architecture with VIN feed-forward to maintain tight frequency stability (2.4MHz ±10%) across 2.5V–6V input and 0–2A load. Its internal dual-MOSFET power stage eliminates external high-side drive complexity while enabling 100% duty cycle for ultra-low dropout operation.
Functional safety support includes MPSafe™ QM documentation, and system-level robustness is enhanced by integrated features: open-drain PG with 90% VREF rising threshold, external SS pin with 3µA charge current (1nF min), and output discharge via internal 150Ω path-enabling controlled power sequencing in automotive clusters and telematics modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 1.2V ±2% (1.176V–1.224V) over –40°C to +150°C; no external feedback divider required. |
| Input voltage range | 2.5V to 6V; supports automotive battery transients including cold-crank (2.5V) and load-dump (6V). |
| Continuous output current | 2A; sustained under full thermal conditions with θJA = 59°C/W on 4-layer EV board. |
| Switching frequency | 2.4MHz ±10%; enables compact 1µH inductor and reduces EMI fundamental below AM band. |
| Feedback reference | Internal 0.6V reference; 1% FB accuracy (±6mV) ensures precise regulation without external trimming. |
| Thermal shutdown | 170°C with 20°C hysteresis; protects against sustained overload or poor PCB heatsinking. |
| Power good threshold | PG asserts high when VFB ≥ 90% of VREF (≥540mV); deasserts at ≤85% (≤510mV) for reliable rail monitoring. |
Pinout & Package
MPQ2178GQHE-12-AEC1-Z is housed in a wettable flank QFN-8 package (1.5mm × 2mm, 0.5mm pitch), optimized for solder joint inspection and thermal performance (θJC = 14°C/W). The exposed thermal pad must be soldered to PCB ground for safe 2A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PG | Open-drain power good indicator | Pulled high via external resistor when VFB ≥ 90% VREF; sinks ≥1mA at 0.4V for fault signaling. |
| 2 - VIN | Main input supply | Accepts 2.5V–6V; requires local 10µF ceramic decoupling adjacent to pin for transient suppression. |
| 3 - SW | Switch node | Drain of internal P-channel MOSFET; connects directly to inductor; high dv/dt node requiring tight layout. |
| 4 - GND | Power and signal ground | Common return for all internal circuits; must be low-impedance connection to thermal pad and output capacitor. |
| 5 - EN | Enable control | Digital input with 0.9V rising / 0.65V falling thresholds; internal 2MΩ pull-down enables default-off behavior. |
| 6 - SS | Soft-start timing | 3µA current source charges external capacitor; tSS = (CSS × 0.6V) / 3µA; 1nF yields ~200ms ramp. |
| 7 - OUT | Regulated output | Delivers 1.2V/2A; connects to output capacitor (22µF typical) and load; internal discharge path active when disabled. |
| 8 - FB | Feedback sense | Floating in fixed-output version; not connected-internal resistor divider sets 1.2V output without external components. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +150°C TJ), MPSafe™ QM documentation available for ISO 26262 ASIL-B system integration. |
| EMI optimization | 2.4MHz FCCM operation + MeshConnect™ flip-chip packaging reduces radiated emissions; passes CISPR25 Class 5 peak/average limits. |
| Board space savings | Integrated 70mΩ/40mΩ MOSFETs and compensation network eliminate 6 external components vs. controller-based solutions. |
| Robust protection suite | Hiccup-mode SCP, thermal shutdown (170°C), output OVP (115% VFB), and absolute VIN OVP (6.1V) prevent catastrophic failure. |
| Power sequencing support | EN-controlled startup, pre-biased start-up capability, and PG output enable synchronized multi-rail sequencing in ADAS domain controllers. |
Applications
| Automotive Infotainment | ADAS Camera Modules |
|---|---|
|
Use Scenario: Powering SoC I/O rails and DDR memory interfaces in head-unit systems operating across automotive battery voltage range. IC Role / Device Role / Timing Role: Primary 1.2V buck regulator supplying core logic voltage with fast transient response to handle burst-mode video processing loads. Use Value: 2.4MHz switching enables use of 1µH inductors and <100mVpp output ripple at 2A, reducing solution size by 35% vs. 500kHz alternatives. |
Use Scenario: Generating clean 1.2V supply for image signal processors (ISPs) and MIPI CSI-2 transceivers in rear-view and surround-view cameras. IC Role / Device Role / Timing Role: Fixed-output point-of-load regulator with PG monitoring to ensure ISP power integrity before frame capture initiation. Use Value: Integrated output discharge prevents reverse current into powered-down sensors during hot-plug events, eliminating need for external Schottky diodes. |
| Automotive Digital Clusters | Telematics Control Units (TCUs) |
|
Use Scenario: Supplying 1.2V to microcontroller cores and display interface circuitry in digital instrument clusters with aggressive thermal constraints. IC Role / Device Role / Timing Role: High-efficiency, thermally robust buck converter operating continuously at 1.5A with ambient up to 85°C. Use Value: Wettable flank QFN-8 package enables AOI-compatible solder joints and achieves 59°C/W θJA on 4-layer boards, sustaining 2A without derating. |
Use Scenario: Providing regulated 1.2V for LTE/5G modems and GNSS receivers in vehicle connectivity modules subject to wide temperature cycling. IC Role / Device Role / Timing Role: AEC-Q100 qualified power stage supporting functional safety requirements for cellular modem power sequencing and fault reporting. Use Value: PG output tied to modem reset logic ensures firmware only boots after stable 1.2V rail is confirmed, preventing communication lockups during cold starts. |
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 |
|---|---|---|---|
| MPQ2178GQHE-12-AEC1 | No -Z suffix; supplied in cut tape or tube, not tape-and-reel. | Same electrical specs and automotive qualification; lacks reel packaging for automated SMT lines. | Select when manual placement or low-volume prototyping is used; avoid for high-throughput production. |
| MPQ2178GQHE-125-AEC1-Z | Fixed 1.25V output (±2%), identical package, pinout, and protections. | Targets 1.25V FPGA I/O banks or specific sensor biasing; not drop-in for 1.2V logic rails. | Choose only if system requires precisely 1.25V; 1.2V tolerance mismatch may cause logic level violations in 1.2V domains. |
Compared with MPQ2178GQHE-12-AEC1-Z, the non-reel variant sacrifices SMT line efficiency but retains full automotive compliance, while the 1.25V version trades output voltage precision for incompatible rail alignment-making the -Z variant the sole choice for volume production of 1.2V automotive subsystems.
Availability
MPQ2178GQHE-12-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and digital cluster designs requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle assurance.
Supply support for MPQ2178GQHE-12-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MPQ2178 belongs to MPS's automotive-grade DC/DC converter product line, engineered specifically for demanding automotive subsystems-including infotainment, clusters, and telematics-where AEC-Q100 qualification, thermal resilience, and EMI robustness are mandatory.
FAQ
What is the minimum recommended soft-start capacitance for MPQ2178GQHE-12-AEC1-Z?
The datasheet specifies a minimum soft-start capacitance of 1nF for the MPQ2178GQHE-12-AEC1-Z. With its 3µA SS charge current, this yields a typical soft-start time of approximately 200ms. Using less than 1nF risks excessive inrush current and potential output overshoot during startup.
Does MPQ2178GQHE-12-AEC1-Z require an external feedback resistor divider?
No. The "-12" suffix denotes a fixed 1.2V output version; the internal resistor divider is laser-trimmed at wafer test, so the FB pin is left floating. External resistors are unnecessary and would disrupt regulation.
Can MPQ2178GQHE-12-AEC1-Z operate with 100% duty cycle?
Yes. The device supports 100% duty cycle operation in dropout mode-critical for maintaining 1.2V output when input drops to 2.5V. This is enabled by its COT control architecture and internal synchronous rectifier.
What is the purpose of the wettable flank feature in the QFN-8 package?
The wettable flank design exposes vertical copper sidewalls on all perimeter pins, enabling automated optical inspection (AOI) of solder fillets. This improves process yield and reliability verification in automotive manufacturing without requiring X-ray inspection.
How does the MPQ2178GQHE-12-AEC1-Z handle short-circuit faults?
It enters hiccup-mode short-circuit protection: after detecting overcurrent, it shuts down for ~500µs, then attempts restart. This limits average power dissipation and prevents thermal runaway while allowing automatic recovery once the fault clears.
Is the PG pin compatible with 3.3V logic systems?
Yes. The PG pin is open-drain and requires an external pull-up resistor (typically 10kΩ to 3.3V or 5V). When asserted, it pulls low to ≤0.4V at 1mA sink; when inactive, it floats, allowing direct interfacing with 3.3V microcontrollers.
What PCB layout guidance is critical for thermal performance?
Maximize copper area connected to the exposed thermal pad (pin 4/GND) using ≥4 thermal vias (0.3mm diameter) to inner ground planes. Keep high-current paths (VIN→SW→inductor→OUT→COUT→GND) short and wide to minimize parasitic inductance and resistive loss.
MPQ2178GQHE-12-AEC1-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-VFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 2.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-QFN (2x1.5)
MPQ2178GQHE-12-AEC1-Z FAQ
1.How can I place an order for MPQ2178GQHE-12-AEC1-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ2178GQHE-12-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 MPQ2178GQHE-12-AEC1-Z reliable?
The price and inventory of MPQ2178GQHE-12-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 MPQ2178GQHE-12-AEC1-Z is usually 5 days.
3.What payment methods are accepted for MPQ2178GQHE-12-AEC1-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2178GQHE-12-AEC1-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ2178GQHE-12-AEC1-Z?
MPQ2178GQHE-12-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ2178GQHE-12-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 MPQ2178GQHE-12-AEC1-Z?
For technical support, including MPQ2178GQHE-12-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2178GQHE-12-AEC1-Z requirements.
6.How does Aetrix verify that MPQ2178GQHE-12-AEC1-Z is sourced from the original manufacturer or authorized distributors?
All MPQ2178GQHE-12-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 MPQ2178GQHE-12-AEC1-Z meets industry standards.
7.What is the process for return or replacement of MPQ2178GQHE-12-AEC1-Z?
All MPQ2178GQHE-12-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2178GQHE-12-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 MPQ2178GQHE-12-AEC1-Z part is unused and in its original packaging.
Return procedure for MPQ2178GQHE-12-AEC1-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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