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Monolithic Power Systems Inc. MPQ2178GQHE-125-AEC1-Z
- Part No.:
- MPQ2178GQHE-125-AEC1-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-VFDFN
- Datasheet:
-
MPQ2178GQHE-125-AEC1-Z.pdf
- Description:
- IC REG BUCK 1.25V 2A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MPQ2178GQHE-125-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 1.25V with 2.4MHz switching frequency, 70mΩ/40mΩ internal MOSFETs, and integrated power-good (PG) and soft-start (SS) functions-designed for automotive infotainment power rails requiring high efficiency and low EMI in compact QFN-8 (1.5mm×2mm) wettable flank packages.
For engineers reviewing the MPQ2178GQHE-125-AEC1-Z datasheet, MPQ2178GQHE-125-AEC1-Z pinout, MPQ2178GQHE-125-AEC1-Z application, or MPQ2178GQHE-125-AEC1-Z equivalent, this part supports pre-biased start-up, FCCM operation across full load, 100% duty cycle capability, and meets CISPR25 Class 5 conducted/radiated EMI limits-critical for automotive cluster and telematics power supply design.
Technical Context
The MPQ2178GQHE-125-AEC1-Z employs constant-on-time (COT) control with VIN feed-forward to maintain stable 2.4MHz switching across 2.5V–6V input and full load range, enabling fast transient response without external compensation. Its integrated P-channel (70mΩ) and N-channel (40mΩ) MOSFETs support 2A continuous output with 1.25V ±2.4% regulation accuracy over –40°C to +150°C junction temperature.
Functional safety support includes MPSafe™ QM documentation, AEC-Q100 Grade 1 qualification, and robust fault protection: cycle-by-cycle current limiting, thermal shutdown (170°C), hiccup-mode short-circuit protection, output over-voltage (115% VFB), and power-good monitoring with 90% VFB rising threshold and 85% falling threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.25V ±2.4% (1.225V–1.275V) - ensures stable core voltage for automotive microcontrollers and sensors. |
| Max Output Current | 2A continuous - sufficient for powering SoCs, display drivers, or camera modules in constrained space. |
| Switching Frequency | 2.4MHz ±10% - enables use of small 1μH inductors and reduces EMI filtering footprint. |
| Input Voltage Range | 2.5V to 6V - compatible with 3.3V/5V automotive rails and battery-backed systems including start-stop conditions. |
| Feedback Accuracy | ±1% at TJ = 25°C, ±1.5% over –40°C to +150°C - guarantees tight regulation under extreme thermal stress. |
| Thermal Shutdown | 170°C with 20°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking. |
| Power Good Threshold | Rising at 90% VFB (1.125V), falling at 85% VFB (1.0625V) - provides reliable system reset sequencing for downstream logic. |
Pinout & Package
MPQ2178GQHE-125-AEC1-Z is housed in a wettable flank QFN-8 package (1.5mm × 2mm, 0.5mm pitch), optimized for automated optical inspection (AOI) and enhanced solder joint reliability in automotive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PG | Open-drain power-good indicator | Pulled high when VFB ≥ 90% of internal 0.6V reference; pulled low if VFB drops below 85%; requires external pull-up resistor. |
| 2 - VIN | Main input supply | Accepts 2.5V–6V; requires local ceramic decoupling to suppress high-frequency switching noise. |
| 3 - SW | Switching node | Drain of internal P-channel high-side MOSFET; connects directly to inductor; carries high di/dt current. |
| 4 - GND | Power and signal ground | Common return path for all internal circuits; must be connected to low-impedance PCB ground plane. |
| 5 - EN | Enable control | Digital input with 0.9V rising / 0.65V falling thresholds; internal 2MΩ pull-down enables default disable state. |
| 6 - SS | Soft-start timing | Charged by internal 16µA current source; sets controlled VOUT ramp time via external capacitor (min 5.3nF). |
| 7 - OUT | Regulated output | Delivers 1.25V to load; requires bulk and high-frequency ceramic capacitors for ripple suppression and stability. |
| 8 - FB | Feedback sense | Internally tied to fixed 1.25V divider; can be left floating in fixed-output configuration per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| MeshConnect™ Flip-Chip Packaging | Reduces parasitic inductance and improves thermal resistance (θJC = 14°C/W on EV board), enhancing EMI performance and power density. |
| Forced Continuous Conduction Mode (FCCM) | Maintains fixed 2.4MHz frequency across 0–2A load, eliminating audible noise and simplifying EMI filter design. |
| Pre-Biased Start-Up | Enables safe turn-on even when output capacitor is pre-charged - critical for hot-swap and multi-rail sequencing in automotive ECUs. |
| Integrated Output Discharge | Activates internal discharge FET upon shutdown, rapidly bleeding stored energy from COUT to prevent residual voltage hold-up. |
| AEC-Q100 Grade 1 Qualification | Validated for operation from –40°C to +150°C junction temperature, meeting automotive reliability and lifetime requirements. |
Applications
| Automotive Infotainment | Automotive Clusters |
|---|---|
Use Scenario: Powering SoC cores and GPU subsystems in head-unit displays with dynamic load profiles. IC Role / Device Role / Timing Role: Primary 1.25V buck regulator supplying processor I/O and memory interface rails. Use Value: FCCM operation ensures consistent 2.4MHz switching during rapid load transients, minimizing output voltage droop and avoiding system resets. | Use Scenario: Supplying instrument cluster microcontrollers and TFT-LCD bias rails in harsh thermal environments. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter delivering regulated 1.25V with integrated PG for MCU reset coordination. Use Value: AEC-Q100 Grade 1 rating and 150°C max junction temperature enable reliable operation behind dashboard without derating. |
| Camera Modules | Telematics Control Units |
Use Scenario: Providing clean, low-noise 1.25V power to image sensor analog front-ends and ISP processors. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter with ultra-low output ripple (<5mVpp) in steady state. Use Value: MeshConnect™ packaging and 2.4MHz operation reduce conducted EMI, easing CISPR25 Class 5 compliance for ADAS camera systems. | Use Scenario: Powering LTE/C-V2X modems and GNSS receivers requiring stable 1.25V under wide input voltage swings (e.g., cold crank). IC Role / Device Role / Timing Role: Input-robust buck converter supporting 2.5V–6V operation with 100% duty cycle for low-dropout scenarios. Use Value: Under-voltage lockout (2.45V rising threshold) and fast transient response prevent modem brownouts during engine cranking events. |
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 |
|---|---|---|---|
| MPQ2177GQHE-125-AEC1-Z | Same pinout and 1.25V fixed output, but rated for 1.5A max output current and 1.5MHz switching frequency. | Suitable for lower-power clusters or body control modules where thermal margin is less constrained. | Select when 1.5A suffices and lower switching frequency eases EMI filtering complexity. |
| TPS6286418RTERQ1 | 1.25V fixed output, 3A capability, 4MHz switching, but uses different pinout and lacks integrated output discharge. | Preferred for higher-current telematics or gateway applications needing >2A headroom and faster transient response. | Choose only if board redesign is acceptable and 4MHz operation aligns with system EMI strategy. |
Compared with MPQ2177GQHE-125-AEC1-Z, this part delivers 33% higher current and 60% higher switching frequency in identical footprint; versus TPS6286418RTERQ1, it offers pin compatibility, integrated discharge, and proven CISPR25 Class 5 compliance out-of-box-but with lower peak current rating.
Availability
MPQ2178GQHE-125-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment systems, instrument clusters, and telematics control units requiring stable component supply with AEC-Q100 Grade 1 qualification and long-term production continuity.
Supply support for MPQ2178GQHE-125-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 leadership in DC/DC conversion, motor drivers, and automotive-grade solutions.
The MPQ2178 belongs to MPS's automotive-qualified MPQ series of monolithic buck converters, designed specifically for demanding automotive subsystems requiring AEC-Q100 compliance, functional safety readiness (MPSafe™ QM), and minimal external component count.
FAQ
What is the minimum recommended soft-start capacitor value for MPQ2178GQHE-125-AEC1-Z?
The datasheet specifies a minimum soft-start capacitance of 5.3nF for the 1.25V fixed-output variant, due to its internal 16µA SS charge current. Using less than this value may cause excessive inrush current or output overshoot during startup, compromising reliability in automotive environments.
Does MPQ2178GQHE-125-AEC1-Z support pre-biased start-up?
Yes-it supports pre-biased start-up, allowing safe turn-on even when the output capacitor holds residual voltage. This feature eliminates potential shoot-through or reverse current issues during hot-swap or multi-rail power sequencing common in automotive ECUs and gateways.
Can the FB pin be left unconnected in the fixed-output version?
Yes. For fixed-output variants like MPQ2178GQHE-125-AEC1-Z, the FB pin is internally connected to the precision voltage divider and may be left floating. Connecting external resistors or capacitors to FB is unnecessary and may degrade regulation accuracy or stability.
What is the thermal resistance (θJA) of MPQ2178GQHE-125-AEC1-Z on a standard 4-layer JEDEC board?
On a JESD51-7 compliant 4-layer PCB, θJA is 130°C/W. However, on the recommended evaluation board (EVQ2178-QH-00A, 4-layer, 2oz copper), measured θJA is 59°C/W-demonstrating significant thermal improvement with proper layout and copper pour, critical for automotive under-hood applications.
How does the power-good (PG) pin behave during thermal shutdown?
During thermal shutdown, the PG pin is actively pulled low to indicate loss of regulation. It remains low until junction temperature falls below the hysteresis threshold (150°C), and VFB recovers above 90% of the 0.6V reference-ensuring downstream systems receive unambiguous fault signaling before resuming operation.
Is output discharge enabled by default when EN is pulled low?
Yes. When EN is driven below 0.65V, the device enters shutdown and automatically activates the internal output discharge FET, providing a 150Ω path from OUT to GND. This discharges the output capacitor within milliseconds, preventing unintended wake-up or latch-up in downstream circuitry.
What EMI certifications does MPQ2178GQHE-125-AEC1-Z meet out-of-the-box?
The device meets CISPR25 Class 5 limits for both conducted (150kHz–108MHz) and radiated (150kHz–1GHz) emissions in standard evaluation board configurations-verified with horizontal/vertical polarization and peak/average detection-making it suitable for automotive EMC-compliant designs without additional shielding or filtering.
MPQ2178GQHE-125-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):
- 6V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 2.4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 8-QFN (2x1.5)
MPQ2178GQHE-125-AEC1-Z FAQ
1.How can I place an order for MPQ2178GQHE-125-AEC1-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ2178GQHE-125-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-125-AEC1-Z reliable?
The price and inventory of MPQ2178GQHE-125-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-125-AEC1-Z is usually 5 days.
3.What payment methods are accepted for MPQ2178GQHE-125-AEC1-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2178GQHE-125-AEC1-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ2178GQHE-125-AEC1-Z?
MPQ2178GQHE-125-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ2178GQHE-125-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-125-AEC1-Z?
For technical support, including MPQ2178GQHE-125-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2178GQHE-125-AEC1-Z requirements.
6.How does Aetrix verify that MPQ2178GQHE-125-AEC1-Z is sourced from the original manufacturer or authorized distributors?
All MPQ2178GQHE-125-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-125-AEC1-Z meets industry standards.
7.What is the process for return or replacement of MPQ2178GQHE-125-AEC1-Z?
All MPQ2178GQHE-125-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2178GQHE-125-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-125-AEC1-Z part is unused and in its original packaging.
Return procedure for MPQ2178GQHE-125-AEC1-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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