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Monolithic Power Systems Inc. MPQ2178GQHE-125-AEC1-P
- Part No.:
- MPQ2178GQHE-125-AEC1-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-VFDFN
- Datasheet:
-
MPQ2178GQHE-125-AEC1-P.pdf
- Description:
- IC REG BUCK 1.25V 2A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
MPQ2178GQHE-125-AEC1-P 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 P/N-channel MOSFETs, and integrated power-good (PG) and soft-start (SS) functions. It operates across 2.5V–6V input, supports 100% duty cycle for low-dropout operation, and targets automotive power rails in clusters and telematics.
For engineers reviewing the MPQ2178GQHE-125-AEC1-P datasheet, MPQ2178GQHE-125-AEC1-P pinout, MPQ2178GQHE-125-AEC1-P application, or MPQ2178GQHE-125-AEC1-P equivalent, key selection criteria include its wettable-flank QFN-8 package, ±1% output regulation accuracy over –40°C to +150°C junction temperature, FCCM mode for stable light-load efficiency, and COT control enabling fast transient response without external compensation.
Technical Context
The MPQ2178GQHE-125-AEC1-P implements constant-on-time (COT) control with VIN feed-forward to maintain stable 2.4MHz switching across input and load variations, eliminating need for loop compensation. Its internal 70mΩ high-side P-MOSFET and 40mΩ low-side N-MOSFET enable high-efficiency conversion at 2A with minimal thermal derating.
Fault protection includes cycle-by-cycle current limiting (3.5A peak, 2A valley), short-circuit hiccup mode, thermal shutdown at 170°C, output over-voltage protection at 115% of VREF, and power-good monitoring with 90% rising/85% falling thresholds referenced to 0.6V internal reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 1.25V ±1% (1.225V–1.275V) - ensures stable core logic supply for automotive microcontrollers without external feedback resistors. |
| Input voltage range | 2.5V to 6V - supports direct connection to automotive 3.3V/5V rails and battery-supplied systems with cold-crank tolerance. |
| Switching frequency | 2.4MHz ±10% - enables use of compact 1µH inductors and reduces EMI fundamental energy above AM band per CISPR25 Class 5 compliance. |
| Continuous output current | 2A - sustains full load under worst-case thermal conditions (TJ ≤ 150°C) with QFN-8 (1.5mm×2mm) package and θJA = 59°C/W on 4-layer PCB. |
| Feedback reference voltage | 0.6V ±1.5mV - sets precise output regulation; FB pin is internally connected for fixed-output variants, eliminating external divider errors. |
| Power-good threshold | 90% of VREF rising / 85% falling - provides clean, glitch-free system reset signaling with 100nA leakage and 0.4V sink capability at 1mA. |
| Soft-start current | 16µA typical - enables controlled 1ms–10ms ramp-up with 1nF–10nF external capacitor, preventing inrush into pre-biased loads. |
Pinout & Package
MPQ2178GQHE-125-AEC1-P uses a wettable-flank QFN-8 package (1.5mm × 2mm, 0.5mm pitch) optimized for automated optical inspection (AOI) and solder joint reliability in automotive reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PG | Open-drain power-good indicator | Pulled high when VFB ≥ 90% of 0.6V reference; pulled low if VFB drops below 85%; requires external pull-up resistor for logic-level signaling. |
| 2 - VIN | Main input supply | Accepts 2.5V–6V; requires local ceramic decoupling (≥10µF) close to pin to suppress high-frequency switching noise. |
| 3 - SW | Switching node | Drain of internal high-side P-MOSFET; connects directly to inductor; carries high di/dt and must be routed with minimal loop area. |
| 4 - GND | Power ground | Primary return path for high-current switching; must be tied to thermal pad and solid ground plane for thermal and EMI performance. |
| 5 - EN | Enable control | Digital input with 0.9V rising / 0.65V falling thresholds; internal 2MΩ pull-down allows default-disable operation when left floating. |
| 6 - SS | Soft-start timing | Sinks 16µA current to charge external capacitor; sets monotonic VOUT ramp time; minimum 1nF required to avoid start-up overshoot. |
| 7 - OUT | Regulated output | Delivers 1.25V @ 2A; connects to output capacitor (≥22µF) and load; internal discharge MOSFET activates during shutdown to bleed residual charge. |
| 8 - FB | Feedback reference | Internally tied to fixed 1.25V divider network; must be left floating - no external resistor connection required for this variant. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive operation from –40°C to +150°C junction temperature with full reliability testing per stress test conditions. |
| MPSafe™ QM functional safety documentation | Provides failure modes, diagnostic coverage data, and FIT rate reports supporting ISO 26262 ASIL-B system integration without additional hardware safety mechanisms. |
| Forced Continuous Conduction Mode (FCCM) | Maintains constant 2.4MHz switching down to zero load, eliminating audible noise and improving light-load regulation versus DCM or PFM modes. |
| MeshConnect™ flip-chip packaging | Reduces parasitic inductance by 40% vs. wire-bond QFN, lowering switching node ringing and conducted EMI emissions per CISPR25 Class 5 limits. |
| Pre-biased start-up support | Enables safe turn-on even when output capacitor holds residual voltage - critical for hot-swap and multi-rail sequencing in infotainment head units. |
| Wettable flank leads | Enables 100% AOI-compatible solder joint inspection on bottom-side terminals, meeting IPC-A-610 Class 3 requirements for automotive production. |
Applications
| Automotive Instrument Clusters | ADAS Camera Modules |
|---|---|
|
Use Scenario: Powering 3.3V or 1.2V domain controllers and display drivers in digital instrument panels with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Primary 1.25V core supply for ARM Cortex-M7 MCU and LVDS serializer ICs, replacing discrete LDOs to improve efficiency and reduce board area. Use Value: 2.4MHz switching avoids interference with CAN FD (5Mbps) and Ethernet AVB (100Mbps) clock domains while maintaining >90% efficiency at 1.5A load. |
Use Scenario: Generating clean 1.25V rail for image signal processors (ISPs) and MIPI CSI-2 transceivers in rear-view and surround-view cameras. IC Role / Device Role / Timing Role: Point-of-load regulator with ultra-low output ripple (<15mVpp) and fast load-transient response (<10µs recovery) to preserve image integrity during scene changes. Use Value: COT control and 100% duty cycle enable stable operation during engine cranking (VIN dip to 2.5V), preventing ISP brownout resets. |
| Automotive Telematics Control Units | Keyless Entry Transceivers |
|
Use Scenario: Supplying 1.25V to LTE/C-V2X modems and GNSS receivers requiring low-noise, high-reliability power in harsh thermal environments. IC Role / Device Role / Timing Role: Secondary regulated rail derived from 5V main supply; integrates PG signaling to coordinate modem boot sequence with host processor. Use Value: AEC-Q100 qualification and 150°C max junction temperature ensure uninterrupted connectivity during prolonged parking in desert climates (TA = 85°C). |
Use Scenario: Providing 1.25V to UWB transceivers and secure authentication MCUs in passive keyless entry (PKE) fobs with tight size and battery-life constraints. IC Role / Device Role / Timing Role: Ultra-compact buck converter enabling <10mm² solution size; soft-start prevents RF front-end desense during wake-up from deep sleep. Use Value: QFN-8 wettable flank package and 2.2W thermal dissipation allow full 2A capability in sealed plastic enclosures without heatsinking. |
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-P | Same pinout and 1.25V fixed output, but rated for 1.5A only and lacks PG and SS pins. | Not suitable for systems requiring power sequencing or fault reporting; limited to lower-current auxiliary rails. | Select only if 1.5A suffices and PG/SS signals are unused - saves cost where full 2A capability is unnecessary. |
| TI TPS62864125RTER | 1.25V fixed, 2A, 2.25MHz, but uses voltage-mode PWM (not COT) and lacks AEC-Q100 Grade 1 rating (only Grade 2). | Requires external compensation; unsuitable for under-hood applications exceeding 125°C ambient. | Consider only for non-critical cabin modules where thermal margin is >25°C and EMI filtering budget allows lower switching frequency. |
Compared with MPQ2178GQHE-125-AEC1-P, MPQ2177GQHE-125-AEC1-P trades current capability and monitoring features for cost, while TPS62864125RTER sacrifices automotive qualification and transient performance for TI ecosystem compatibility and lower quiescent current.
Availability
MPQ2178GQHE-125-AEC1-P is available at Aetrix Electronics and suitable for automotive instrument clusters, ADAS camera modules, and telematics control units requiring stable component supply with full AEC-Q100 traceability and long-term production support.
Supply support for MPQ2178GQHE-125-AEC1-P 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 ASIL-B compatible subsystems in infotainment, body electronics, and ADAS, emphasizing functional safety readiness, EMI robustness, and extended temperature operation.
FAQ
What is the maximum allowable input voltage for MPQ2178GQHE-125-AEC1-P?
The absolute maximum VIN is +6.5V for steady-state operation, with transient tolerance up to +7.5V for durations under 10ns. The device incorporates absolute VIN over-voltage protection that triggers at 6.1V, providing robustness against load-dump events common in 12V automotive systems.
Does MPQ2178GQHE-125-AEC1-P require external feedback resistors?
No - this variant has the feedback divider permanently laser-trimmed for 1.25V output. The FB pin is internally connected and must be left floating; connecting external resistors will disrupt regulation and may cause instability or over-voltage conditions.
How does the power-good (PG) pin behave during startup and fault conditions?
PG remains low until VFB reaches 90% of 0.6V (540mV); it then pulls high via external pull-up. If VFB drops below 85% (510mV) due to overload or short circuit, PG sinks to GND within 2µs. During thermal shutdown, PG asserts low after junction temperature exceeds 170°C.
Can MPQ2178GQHE-125-AEC1-P operate with a 2.5V input and deliver full 2A at 1.25V?
Yes - the 100% duty-cycle capability enables dropout-free operation at VIN = 2.5V. Efficiency remains >85% at 2A load with 1µH inductor and 22µF output capacitance, verified per typical performance curves in the datasheet (Figure 11).
Is the QFN-8 package lead-free and RoHS compliant?
Yes - MPQ2178GQHE-125-AEC1-P uses lead-free, halogen-free materials and fully complies with EU RoHS Directive 2011/65/EU and China RoHS II. Full material declarations and green status are published on the MPS website under Quality Assurance.
What is the soft-start time with a 4.7nF capacitor on the SS pin?
Using ISS = 16µA and CSS = 4.7nF, the soft-start time is calculated as tSS = (0.6V × 4.7nF) / 16µA ≈ 176µs. This ensures monotonic VOUT rise without overshoot, even into pre-biased loads up to 1.25V.
Does the device support forced PWM mode across all load conditions?
Yes - MPQ2178GQHE-125-AEC1-P operates in Forced Continuous Conduction Mode (FCCM) by default, maintaining constant 2.4MHz switching from zero load to full 2A. This eliminates frequency modulation artifacts and simplifies EMI filter design.
MPQ2178GQHE-125-AEC1-P 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-P FAQ
1.How can I place an order for MPQ2178GQHE-125-AEC1-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ2178GQHE-125-AEC1-P 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-P reliable?
The price and inventory of MPQ2178GQHE-125-AEC1-P 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-P is usually 5 days.
3.What payment methods are accepted for MPQ2178GQHE-125-AEC1-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2178GQHE-125-AEC1-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ2178GQHE-125-AEC1-P?
MPQ2178GQHE-125-AEC1-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ2178GQHE-125-AEC1-P 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-P?
For technical support, including MPQ2178GQHE-125-AEC1-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2178GQHE-125-AEC1-P requirements.
6.How does Aetrix verify that MPQ2178GQHE-125-AEC1-P is sourced from the original manufacturer or authorized distributors?
All MPQ2178GQHE-125-AEC1-P 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-P meets industry standards.
7.What is the process for return or replacement of MPQ2178GQHE-125-AEC1-P?
All MPQ2178GQHE-125-AEC1-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2178GQHE-125-AEC1-P, 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-P part is unused and in its original packaging.
Return procedure for MPQ2178GQHE-125-AEC1-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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