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Monolithic Power Systems Inc. MPQ2178GQHE-Z
- Part No.:
- MPQ2178GQHE-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-VFDFN
- Datasheet:
-
MPQ2178GQHE-Z.pdf
- Description:
- IC REG BUCK ADJ 2A 8QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,550
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Product details
Overview
MPQ2178GQHE-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, synchronous step-down DC/DC converter delivering 2A continuous output current across a 2.5V–6V input range, with adjustable output down to 0.6V, 2.4MHz switching frequency, integrated power MOSFETs (70mΩ PCH / 40mΩ NCH), and automotive-grade thermal operation (−40°C to +150°C junction). It serves as the primary voltage regulator in space-constrained automotive infotainment and telematics power rails.
For engineers reviewing the MPQ2178GQHE-Z datasheet, MPQ2178GQHE-Z pinout, MPQ2178GQHE-Z application, or MPQ2178GQHE-Z equivalent, key selection criteria include its COT control architecture for fast transient response, wettable-flank QFN-8 (1.5mm×2mm) package for automated optical inspection, Power Good (PG) and external soft-start (SS) for sequencing-critical systems, and FCCM mode for low-noise operation across full load range.
Technical Context
The MPQ2178GQHE-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, enabling rapid load transient recovery without loop compensation. Its internal high-side P-channel and low-side N-channel MOSFETs eliminate external switch requirements and reduce BOM count.
Fault protection includes cycle-by-cycle current limiting (3.5A peak PCH / 2A valley NCH), short-circuit hiccup mode, thermal shutdown at 170°C, output over-voltage protection (115% VFB), and under-voltage lockout with 200mV hysteresis - all validated for automotive Grade 1 reliability per AEC-Q100.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 6V - supports direct connection to automotive battery (cold-crank down to 2.5V) without pre-regulation. |
| Output Current | 2A continuous - sufficient for powering SoCs, FPGAs, or multi-rail PMICs in infotainment head units. |
| Switching Frequency | 2.4MHz ±10% - enables use of compact 1µH inductors and reduces EMI filter size for CISPR-25 Class 5 compliance. |
| Feedback Accuracy | ±1% (594–606mV at TJ=25°C) - ensures tight output regulation for sensitive analog/digital cores. |
| Junction Temp Range | −40°C to +150°C - meets AEC-Q100 Grade 1 requirements for under-hood and dashboard-mounted modules. |
| Power Good Threshold | 90% VFB rising / 85% VFB falling - provides precise rail monitoring for microcontroller reset sequencing. |
| Soft-Start Current | 3µA (adjustable version) - sets controlled ramp rate via external capacitor to prevent inrush into pre-biased loads. |
Pinout & Package
MPQ2178GQHE-Z is housed in a wettable-flank QFN-8 package (1.5mm × 2mm, 0.5mm pitch), optimized for solder joint inspection and thermal performance (θJA = 59°C/W on 4-layer EVB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PG | Open-drain power-good indicator | Pulled high when VFB ≥ 90% VREF; pulled low if VFB ≤ 85% VREF - enables system-level rail validation and fault signaling. |
| 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 MOSFET; connects directly to inductor - critical for layout EMI control and thermal path. |
| 4 - GND | Power and signal ground | Single ground pad; must be tied to thermal pad for optimal heat dissipation and noise immunity. |
| 5 - EN | Enable control | Digital input with 0.9V turn-on / 0.65V turn-off thresholds and internal 2MΩ pull-down - simplifies power sequencing. |
| 6 - SS | Soft-start timing | Sinks 3µA to charge external capacitor - determines startup slew rate and prevents output overshoot. |
| 7 - OUT | Regulated output | Delivers up to 2A; connects to output capacitor and load - internal discharge MOSFET actively bleeds residual charge during shutdown. |
| 8 - FB | Feedback sense | Compares divider voltage against 0.6V reference - floating in fixed-output variants; sets VOUT = 0.6V × (1 + R1/R2) in adjustable mode. |
Key Features
| Feature | Design Value |
|---|---|
| MPSafe™ QM Functional Safety Documentation | Provides ASIL-B-ready documentation package for ISO 26262 system integration without requiring additional safety hardware. |
| MeshConnect™ Flip-Chip Packaging | Reduces parasitic inductance and improves thermal resistance (θJC = 14°C/W), enhancing EMC performance and power density. |
| Forced Continuous Conduction Mode (FCCM) | Maintains fixed 2.4MHz operation across 0–100% load - eliminates audible noise and simplifies EMI filtering design. |
| Pre-Biased Start-Up Capability | Enables safe startup into existing output voltage - essential for hot-swap and multi-rail sequencing in automotive clusters. |
| Integrated Output Discharge | 150Ω internal discharge path from OUT to GND - eliminates need for external bleed circuitry and accelerates power-down settling. |
Applications
| Automotive Infotainment Head Unit | ADAS Camera Module |
|---|---|
|
Use Scenario: Powers SoC, DDR memory, and display interface in 12V-powered infotainment systems with cold-crank resilience. IC Role / Device Role / Timing Role: Primary 1.2V/1.8V buck regulator with PG signaling for processor reset coordination and thermal derating. Use Value: 2.4MHz switching allows <1.5mm² solution size; AEC-Q100 Grade 1 rating ensures operation at 125°C ambient under dash. |
Use Scenario: Supplies clean 1.2V core and 2.8V I/O rails to image sensor and ISP in rear-view or surround-view cameras. IC Role / Device Role / Timing Role: Dual-output capable (via multiple MPQ2178 instances); SS and PG enable synchronized startup with sensor initialization. Use Value: FCCM mode eliminates low-load frequency jitter that could couple into analog video paths; wettable flank ensures AOI-verified assembly. |
| Automotive Telematics Control Unit | Keyless Entry Transceiver |
|
Use Scenario: Regulates 3.3V for LTE modem, GNSS receiver, and CAN transceiver in TCU modules exposed to engine bay temperatures. IC Role / Device Role / Timing Role: High-efficiency buck converter with 100% duty cycle support for low-dropout operation during battery brownouts. Use Value: −40°C to +150°C junction rating and 170°C thermal shutdown protect against sustained under-hood thermal stress. |
Use Scenario: Powers UWB or LF transceiver IC in smart key fobs where battery life and PCB area are critical constraints. IC Role / Device Role / Timing Role: Ultra-compact 1.5mm×2mm buck delivering 2A peak for RF burst transmission while maintaining low quiescent current (460µA typical). Use Value: 0.01µA shutdown current extends coin-cell lifetime; integrated soft-start prevents RF interference during wake-up transitions. |
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-Z | Same footprint and pinout; lower 1.5A output current; 1.5MHz switching frequency; no PG pin. | Lacks power-good signaling and reduced current capability - suitable only for non-sequencing, lower-power nodes (e.g., MCU peripherals). | Select only if PG is unused and load current remains ≤1.5A; not drop-in for MPQ2178's full feature set. |
| TPS6286418RTER | 2A, 2.25MHz, 2.7–6V input; integrated PG; but only −40°C to +125°C junction rating and no AEC-Q100 qualification. | Not qualified for automotive under-hood use; lacks wettable flank and fails Grade 1 thermal requirement. | Acceptable for industrial or consumer battery-powered designs; unsuitable for AEC-Q100-compliant automotive systems. |
Compared with MPQ2177GQHE-Z, the MPQ2178GQHE-Z adds PG, higher current, and 2.4MHz operation for tighter EMI control; versus TPS6286418RTER, it delivers certified automotive reliability, wider temperature range, and enhanced manufacturability via wettable flank - making it the sole choice for production-grade automotive power rails.
Availability
MPQ2178GQHE-Z is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and telematics control units requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.
Supply support for MPQ2178GQHE-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, designed specifically for demanding vehicle subsystems requiring AEC-Q100 compliance, functional safety readiness (MPSafe™ QM), and ultra-small-footprint power delivery.
FAQ
What is the minimum recommended soft-start capacitance for MPQ2178GQHE-Z?
The datasheet specifies a minimum soft-start capacitance of 1nF for the adjustable-output MPQ2178GQHE-Z. With a typical soft-start current of 3µA, this yields a ~600ms ramp time. Larger capacitors extend startup duration linearly and help prevent overshoot into pre-biased outputs or high-capacitance loads.
Does MPQ2178GQHE-Z support 100% duty cycle operation?
Yes - the MPQ2178GQHE-Z supports true 100% duty cycle in dropout conditions, allowing VOUT to track closely to VIN minus conduction losses. This is critical for automotive cold-crank scenarios where input may dip to 2.5V while maintaining regulated 1.2V or 1.8V outputs.
How is Power Good (PG) configured and used in system design?
PG is an open-drain output requiring an external pull-up resistor (typically 10kΩ to 3.3V or 5V). It asserts high when VFB exceeds 90% of 0.6V (i.e., ≥540mV) and pulls low below 85% (≤510mV). It is commonly tied to a microcontroller's reset or interrupt pin for rail health monitoring and sequencing control.
What thermal performance can be expected on a standard 4-layer PCB?
On the EVQ2178-QH-00A evaluation board (6.3cm×6.3cm, 2oz copper, 4-layer), θJA is measured at 59°C/W. At 2A load and 5V input, typical power loss is ~0.35W, resulting in ~21°C rise above ambient - well within the +150°C junction limit even at 125°C ambient.
Is output discharge active during EN-driven shutdown?
Yes - output discharge activates whenever EN is pulled low or floats, regardless of shutdown trigger source. The internal 150Ω discharge path between OUT and GND discharges typical 22µF output capacitors in <10ms, eliminating need for external bleed resistors and ensuring fast power-down settling.
Can MPQ2178GQHE-Z operate with a pre-biased output?
Yes - the MPQ2178GQHE-Z features pre-biased start-up capability. When EN is asserted, the controller begins switching even if VOUT is already present at a valid voltage, preventing reverse current flow and enabling safe hot-plug operation in multi-rail systems.
What is the significance of the "Z" suffix in MPQ2178GQHE-Z?
The "-Z" suffix denotes tape-and-reel packaging per JEDEC standard - specifically, 3,000 units per reel. This format is required for automated SMT placement and qualifies the part for high-volume manufacturing environments with traceable lot control.
MPQ2178GQHE-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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5V
- 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-Z FAQ
1.How can I place an order for MPQ2178GQHE-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ2178GQHE-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-Z reliable?
The price and inventory of MPQ2178GQHE-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-Z is usually 5 days.
3.What payment methods are accepted for MPQ2178GQHE-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ2178GQHE-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ2178GQHE-Z?
MPQ2178GQHE-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ2178GQHE-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-Z?
For technical support, including MPQ2178GQHE-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ2178GQHE-Z requirements.
6.How does Aetrix verify that MPQ2178GQHE-Z is sourced from the original manufacturer or authorized distributors?
All MPQ2178GQHE-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-Z meets industry standards.
7.What is the process for return or replacement of MPQ2178GQHE-Z?
All MPQ2178GQHE-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ2178GQHE-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-Z part is unused and in its original packaging.
Return procedure for MPQ2178GQHE-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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