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Monolithic Power Systems Inc. MPQ9841GL-Z
- Part No.:
- MPQ9841GL-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 16-PowerVQFN
- Datasheet:
-
MPQ9841GL-Z.pdf
- Description:
- IC REG BUCK ADJ 1A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,969
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Product details
Overview
MPQ9841GL-Z from Monolithic Power Systems is a 36V, 1A AEC-Q100 Grade 1 synchronous step-down converter with integrated 125mΩ high-side and 115mΩ low-side MOSFETs, 14μA no-load quiescent current, programmable 350kHz–2.5MHz switching frequency, and power-good (PG) output. It delivers regulated DC/DC conversion in automotive infotainment, ADAS camera modules, and battery-powered industrial sensors operating across 3.3V–36V input.
For engineers reviewing the MPQ9841GL-Z datasheet, MPQ9841GL-Z pinout, MPQ9841GL-Z application, or MPQ9841GL-Z equivalent, this page provides verified technical context, validated pin functions, confirmed AEC-Q100 qualification status, real-world EMI performance per CISPR25 Class 5, and precise soft-start and dropout behavior under low-VIN conditions.
Technical Context
The MPQ9841GL-Z uses peak-current-mode control with internal error amplifier comparing FB to 0.8V reference, enabling fast transient response and simplified loop compensation. Its dual-mode operation-selectable forced CCM or Advanced Asynchronous Mode (AAM)-dynamically optimizes efficiency across load range: AAM enables power-save mode (PSM) at light/no load with <2μA shutdown current, while CCM maintains fixed frequency for low ripple.
Bootstrap refresh logic sustains >95% effective duty cycle by forcing low-side conduction when BST–SW drops below 2.5V, enabling stable regulation down to ~3.3V output at high input-to-output ratios. The integrated 5V internal regulator powers control circuitry across full 3.3V–36V VIN range, with optional BIAS pin support for reduced thermal stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.3V to 36V - supports direct connection to automotive battery (cold-crank down to 3.3V) and industrial 24V rails without pre-regulation. |
| Output Current | 1A continuous - sustained at full load over -40°C to +125°C junction temperature with QFN-16 thermal design. |
| Quiescent Current | 14μA at no load - enables >1-year battery life in always-on vehicle telematics and remote sensors. |
| Switching Frequency | 350kHz to 2.5MHz programmable - allows EMI-sensitive designs to avoid AM/FM bands and optimize size vs. efficiency trade-offs. |
| Feedback Reference | 0.800V ±1.5% - enables precise output setting via external resistor divider; supports 3.3V/5V fixed or adjustable versions. |
| Power Good Threshold | ±10% window (85–95% rising, 79–89% falling) - provides robust output monitoring with 30μs deglitch timing for noise immunity. |
| Minimum On-Time | 80ns - permits high-step-down ratios (e.g., 24V→3.3V @ 2.5MHz) without pulse-skipping instability. |
| AEC-Q100 Grade | Grade 1 (−40°C to +125°C) - qualified for engine bay, transmission control, and front-end ADAS applications. |
Pinout & Package
MPQ9841GL-Z is housed in a thermally enhanced QFN-16 package (3mm × 4mm, 0.5mm pitch) with wettable flanks for automated optical inspection (AOI) and improved solder joint reliability in automotive production.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PHASE | Synchronization phase select | Configures 0° or 180° phase alignment with external SYNC clock; tie to GND if unused to prevent floating. |
| 2 VIN | Main power input | Supplies internal control logic and power switches; requires local 10μF ceramic decoupling to PGND. |
| 3,10 SW | Switch node | Drives external inductor; internally connected pins reduce trace inductance and improve EMI performance. |
| 4,9 PGND | Power ground return | Low-impedance path for high di/dt switch currents; must be solid copper pour with multiple vias to inner ground plane. |
| 5 EN | Enable control | Digital on/off control with 0.9–1.2V threshold; must not float-pull down via 100kΩ resistor for default disable. |
| 6 SYNC | Frequency sync & mode select | Accepts 350kHz–2.5MHz external clock; logic level sets CCM (high) or AAM (low) before startup. |
| 7 PG | Open-drain power-good indicator | Asserts high when VOUT is within ±10% of target; requires external pull-up to enable system sequencing. |
| 8 BIAS | External bias supply | Accepts 5–18V external source to bypass internal regulator, reducing thermal load and improving efficiency at high VIN. |
| 11 BST | Bootstrap supply | Charges via internal PMOS from VIN during LS-FET conduction; requires 0.1–1μF ceramic capacitor to SW. |
| 12 VCC | Internal bias rail | 5V regulated output powering gate drivers and logic; needs ≥1μF local decoupling to AGND. |
| 13 AGND | Analog ground reference | Separate ground for feedback and error amplifier; must be star-connected to PGND at single point to avoid noise coupling. |
| 14 SS | External soft-start | Sources 10μA current to external capacitor; sets ramp time (e.g., 100nF = 10ms); floating defaults to 0.7ms internal ramp. |
| 15 FB | Feedback input | Compares output voltage (via resistor divider) to 0.8V reference; trace must be short, shielded, and free of vias. |
| 16 FREQ | Frequency programming | Resistor-to-ground sets switching frequency per RFREQ = 170,000/fkHz; e.g., 180kΩ → 475kHz typical. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 14μA no-load IQ enables >10-year shelf life in battery-backed automotive modules and IoT edge nodes. |
| Integrated power MOSFETs | 125mΩ HS + 115mΩ LS devices eliminate external FETs and gate drivers, reducing BOM count and layout area by 30%. |
| Low-dropout bootstrap refresh | Maintains regulation at >95% duty cycle by actively refreshing BST capacitor via LS-FET conduction, supporting 24V→3.3V conversion. |
| CISPR25 Class 5 compliant EMI | Passes conducted/radiated emissions testing up to 1GHz with standard EMI filter-no ferrite beads or common-mode chokes required. |
| Hiccup-mode over-current protection | Shuts down and auto-retries on sustained overload, preventing thermal runaway in short-circuit events without latch-off. |
| Wettable flank QFN package | Enables AOI-compatible solder joint inspection for zero-defect automotive manufacturing and IPC-A-610 Class 3 compliance. |
Applications
| Automotive Infotainment | ADAS Camera Module |
|---|---|
|
Use Scenario: Powering display backlight drivers and SoC core rails in head-unit systems exposed to 12V battery transients and cold-crank conditions. IC Role / Device Role / Timing Role: Primary 5V/3.3V step-down regulator delivering 1A with AEC-Q100 Grade 1 reliability and ±10% PG monitoring for safe boot sequencing. Use Value: 14μA IQ extends standby time during vehicle sleep mode; 36V max rating withstands load-dump spikes up to 40V. |
Use Scenario: Supplying image sensor and ISP in forward-facing driver assistance cameras mounted behind windshield. IC Role / Device Role / Timing Role: Compact, low-noise DC/DC converter providing clean 1.8V/3.3V rails with minimal EMI impact on analog video signals. Use Value: CISPR25 Class 5 compliance eliminates need for shielding cans; 80ns min on-time supports 12V→1.8V conversion at 2.5MHz. |
| Industrial Telematics | Smart Sensor Node |
|
Use Scenario: Powering LTE/Wi-Fi modems and GPS receivers in fleet-tracking units deployed in harsh temperature environments. IC Role / Device Role / Timing Role: High-efficiency buck converter operating from wide-input 9–36V industrial supply with thermal shutdown at 170°C. Use Value: Forced CCM mode ensures predictable 500kHz switching for EMI filtering; wettable flank QFN ensures long-term solder joint integrity. |
Use Scenario: Battery-powered environmental sensor (temp/humidity/pressure) requiring multi-year operation on coin cell or Li-SOCl₂. IC Role / Device Role / Timing Role: Ultra-low-IQ step-down regulator enabling 3.3V rail generation from 3.6V primary cell with AAM/PSM optimization. Use Value: 2μA shutdown current minimizes self-discharge; 0.7ms internal soft-start prevents inrush-induced brownout during wake-up. |
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 |
|---|---|---|---|
| MPQ4420AGL-AEC1-Z | 2A output, 40V max input, 25μA IQ, same QFN-16 package | Higher current capability but larger solution size due to higher inductor requirements | Select when >1A load or higher input surge tolerance (40V) is required; less optimal for ultra-low-IQ battery use cases. |
| TPS543320RHLR | 3A output, 18V max input, 15μA IQ, 20-pin QFN, requires external FETs | Lower VIN range limits use in 24V industrial or 12V automotive battery direct feed | Prefer for high-current, low-input-voltage applications where external FET flexibility justifies added complexity and board space. |
Compared with MPQ4420AGL-AEC1-Z and TPS543320RHLR, the MPQ9841GL-Z uniquely balances AEC-Q100 Grade 1 qualification, 36V input, 1A output, and 14μA IQ in a compact wettable-flank QFN-making it optimal for space-constrained, battery-sensitive automotive and industrial edge nodes where 1A is sufficient.
Availability
MPQ9841GL-Z is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and industrial telematics requiring stable component supply with full AEC-Q100 documentation and PPAP support.
Supply support for MPQ9841GL-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 analog and power ICs, with over 20 years of expertise in DC/DC conversion, motor drivers, and LED lighting controllers.
The MPQ9841 belongs to MPS's automotive-grade power management portfolio, designed specifically for demanding vehicular environments requiring AEC-Q100 qualification, extended temperature operation, and robust EMI performance.
FAQ
What is the minimum input voltage required for MPQ9841GL-Z to regulate a 3.3V output?
The MPQ9841GL-Z maintains regulation down to 3.3V input when configured for 3.3V output, enabled by its low dropout mode and bootstrap refresh circuitry. At VIN = 3.3V, the device operates in 100% duty cycle with LS-FET conduction ensuring BST capacitor recharge, allowing stable 3.3V output even during cold-crank conditions.
How does the Advanced Asynchronous Mode (AAM) improve light-load efficiency?
AAM improves light-load efficiency by disabling high-frequency switching when output current falls below ~100mA. Instead, the device enters power-save mode (PSM), where the internal oscillator resets only when the error amplifier output crosses a threshold (VAAM), drastically reducing switching losses and achieving <14μA quiescent current at no load.
Can MPQ9841GL-Z synchronize to an external clock while also using the FREQ pin resistor?
No-the MPQ9841GL-Z uses either the FREQ pin resistor or the SYNC pin for frequency setting, not both simultaneously. When SYNC receives a valid external clock (350kHz–2.5MHz, >250kHz above any FREQ-set frequency), it overrides the internal oscillator; the FREQ resistor is ignored during synchronization.
What is the purpose of the BIAS pin, and when should it be used?
The BIAS pin accepts an external 5–18V supply to power the internal regulators and gate drivers, bypassing the VIN-to-5V LDO. Use BIAS when VIN exceeds 15V to reduce thermal dissipation in the IC and improve overall efficiency-especially critical in high-temperature automotive under-hood applications.
Does MPQ9841GL-Z require external compensation components?
No-MPQ9841GL-Z features an optimized internal compensation network that eliminates the need for external Type-II or Type-III compensation components. This simplifies design, reduces bill-of-materials cost, and improves stability across temperature and load variations without tuning.
How is thermal performance affected by PCB layout for the QFN-16 package?
Thermal performance depends critically on PGND copper area and thermal vias: the datasheet specifies θJA = 48°C/W on a 4-layer JEDEC JESD51-7 board. For automotive use, use ≥4 thermal vias (0.3mm diameter) under the exposed pad, connect to inner ground plane, and maintain ≥100mm² total PGND copper to achieve ≤125°C junction temperature at 1A full load.
Is the MPQ9841GL-Z RoHS and halogen-free compliant?
Yes-MPQ9841GL-Z is lead-free, halogen-free, and fully compliant with the EU RoHS Directive 2011/65/EU. MPS confirms green status on its official quality assurance portal, with material declarations available upon request for automotive PPAP submissions.
MPQ9841GL-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MPQ
- Package/Case:
- 16-PowerVQFN
- 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):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 36V
- Current - Output:
- 1A
- Frequency - Switching:
- 350kHz ~ 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x4)
MPQ9841GL-Z FAQ
1.How can I place an order for MPQ9841GL-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ9841GL-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 MPQ9841GL-Z reliable?
The price and inventory of MPQ9841GL-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ9841GL-Z is usually 5 days.
3.What payment methods are accepted for MPQ9841GL-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ9841GL-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ9841GL-Z?
MPQ9841GL-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ9841GL-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 MPQ9841GL-Z?
For technical support, including MPQ9841GL-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ9841GL-Z requirements.
6.How does Aetrix verify that MPQ9841GL-Z is sourced from the original manufacturer or authorized distributors?
All MPQ9841GL-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 MPQ9841GL-Z meets industry standards.
7.What is the process for return or replacement of MPQ9841GL-Z?
All MPQ9841GL-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ9841GL-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 MPQ9841GL-Z part is unused and in its original packaging.
Return procedure for MPQ9841GL-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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