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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Monolithic Power Systems Inc. MPQ9841GL-AEC1-Z

Name: MPQ9841GL-AEC1-Z
Brand: Monolithic Power Systems Inc.
SKU: MPQ9841GL-AEC1-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPQ9841GL-AEC1-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 16-PowerVQFN

Datasheet:: MPQ9841GL-AEC1-Z.pdf

Description:: IC REG BUCK ADJ 1A 16QFN

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Product details

Overview

MPQ9841GL-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, synchronous step-down DC/DC converter with integrated 125mΩ high-side and 115mΩ low-side MOSFETs, delivering 1A continuous output current across a 3.3V–36V input range. It operates at programmable switching frequencies from 350kHz to 2.5MHz, features 14μA no-load quiescent current, and provides power-good (PG) indication for automotive infotainment and ADAS domain controllers requiring robust, low-I_Q power conversion.

For engineers reviewing the MPQ9841GL-AEC1-Z datasheet, MPQ9841GL-AEC1-Z pinout, MPQ9841GL-AEC1-Z application, or MPQ9841GL-AEC1-Z equivalent, this device supports critical design checks including dropout performance at >90% duty cycle, hiccup-mode over-current protection, external soft-start timing control, and CISPR25 Class 5 EMI-compliant operation in automotive environments.

Technical Context

The MPQ9841GL-AEC1-Z employs peak-current-mode control with internal error amplifier and optimized compensation network, enabling fast transient response and stable loop behavior without external type-II/III compensation. Its dual-mode operation-selectable forced CCM or Advanced Asynchronous Mode (AAM)-dynamically adjusts switching behavior based on load: AAM enables power-save mode (PSM) at light/no load to sustain 14μA I_Q, while CCM ensures fixed-frequency regulation under medium/heavy loads.

Bootstrap charging is managed via dedicated internal regulator with BST refresh logic that forces low-side conduction when BST–SW falls below 2.5V, enabling reliable high-duty-cycle operation down to ~1.2V V_OUT dropout. The device integrates full protection: hiccup OCP, thermal shutdown at 170°C, short-circuit protection, and PG monitoring with ±10% window referenced to 0.8V feedback threshold.

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.
Output current	1A continuous - sufficient for powering microcontrollers, sensors, and CAN transceivers in distributed ECUs.
No-load quiescent current	14μA - enables >1-year battery standby in always-on automotive modules without parasitic drain.
Switching frequency	350kHz–2.5MHz - programmable via FREQ resistor or external SYNC clock; avoids AM radio band and enables compact magnetics.
Feedback reference voltage	0.800V ±1.5% - precision reference enables accurate output regulation across temperature for 3.3V/5V/adjustable configurations.
Power good threshold	±10% of nominal V_OUT - open-drain PG signal asserts after deglitch timer (30μs rise, 50μs fall) for safe system sequencing.
Thermal shutdown	170°C with 20°C hysteresis - protects silicon during sustained overload or poor PCB thermal design.

Pinout & Package

MPQ9841GL-AEC1-Z is housed in a wettable-flank QFN-16 (3mm × 4mm) package rated for AEC-Q100 Grade 1 (−40°C to +125°C T_J). Exposed thermal pad must be soldered to PCB ground plane for thermal performance (θ_JA = 48°C/W).

Pin/Terminal	Circuit Role	Design Meaning
1 PHASE	Synchronization phase select	Drives high for in-phase SYNC; low for 180° out-of-phase; tie to GND if unused to prevent noise coupling.
2 VIN	Main power input	Supplies internal circuitry and high-side switch; requires local 10μF ceramic decoupling adjacent to pin.
3,10 SW	Switch node	Internal connection point of HS/LS MOSFETs; high dv/dt node requiring minimized trace area and guard ring.
4,9 PGND	Power ground return	Low-impedance return path for power switches; must be separated from AGND and joined at single-point star ground.
5 EN	Enable control	Digital enable with 0.9–1.2V rising threshold; must be actively driven-never left floating.
6 SYNC	Frequency sync & mode select	Accepts 350kHz–2.5MHz clock; low pre-startup enables AAM; high enables forced CCM; also sets phase relationship.
7 PG	Power-good indicator	Open-drain output; pulls high only when V_FB is within ±10% of 0.8V; requires external pull-up resistor.
8 BIAS	External bias supply	Accepts 5–18V external rail to reduce V_IN-to-V_CC dissipation; improves efficiency and thermal margin.
11 BST	Bootstrap supply	Charged via internal regulator from VIN; requires 0.1–1μF ceramic capacitor to SW for HS gate drive.
12 VCC	Internal bias rail	5V regulated output for control logic; requires ≥1μF local decoupling to PGND.
13 AGND	Analog ground reference	Reference for FB, SS, and error amplifier; must be routed separately from PGND and connected at single point.
14 SS	Soft-start timing	10μA current source charges external capacitor; floating defaults to 0.7ms internal soft-start.
15 FB	Feedback input	Connects to resistor divider for adjustable output; 0.8V reference enables precise V_OUT setting (e.g., 3.3V, 5V, 12V).
16 FREQ	Frequency programming	Resistor-to-GND sets f_SW: 180kΩ → 475kHz, 82kΩ → 1MHz, 27kΩ → 2.5MHz (typical).

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for −40°C to +125°C junction operation with lifetime reliability testing per automotive stress standards.
Ultra-low 14μA no-load I_Q	Enables >10-year shelf life in battery-backed telematics modules without compromising startup responsiveness.
Programmable minimum on-time (80ns)	Supports high input-to-output voltage ratios (e.g., 24V→3.3V) while maintaining stable PWM control at high f_SW.
Hiccup-mode over-current protection	Shuts down on sustained overload, then auto-retries after thermal recovery-prevents latch-up and enables self-healing.
CISPR25 Class 5 EMI compliance	Validated with standard EMI filter per Figure 14; meets peak/average conducted and radiated limits up to 1GHz.
Low-dropout BST refresh	Maintains high-side gate drive at >90% duty cycle by forcing LS conduction to recharge BST capacitor-critical for 12V→10V applications.

Applications

Automotive Infotainment

ADAS Camera Module

Use Scenario: Powering SoC, DDR memory, and display interface in head-unit systems with cold-crank resilience.

IC Role / Device Role / Timing Role: Primary 5V/3.3V buck converter supplying core logic rails; synchronized to system clock via SYNC pin.

Use Value: 14μA I_Q prevents battery drain during vehicle sleep mode; AEC-Q100 Grade 1 ensures operation across full automotive temperature range.

Use Scenario: Generating clean 3.3V rail for CMOS image sensor and ISP in rear-view or surround-view cameras.

IC Role / Device Role / Timing Role: Secondary buck regulator with low-noise PG signal for sensor power sequencing and fault reporting.

Use Value: ±10% PG window enables reliable camera initialization; 80ns t_ON(min) supports 24V→3.3V conversion at 2MHz for minimal EMI footprint.

Body Control Module (BCM)

Automotive Gateway ECU

Use Scenario: Supplying 5V to LIN transceivers, EEPROM, and microcontroller peripherals in door modules and lighting nodes.

IC Role / Device Role / Timing Role: Compact, integrated buck converter replacing discrete controller + external MOSFETs; reduces BOM count and layout area.

Use Value: QFN-16 wettable flank enables automated optical inspection (AOI); 125mΩ/115mΩ R_DS(on) minimizes thermal derating at 1A.

Use Scenario: Providing isolated 3.3V and 5V rails for CAN FD, Ethernet AVB, and security MCU in zonal gateway architectures.

IC Role / Device Role / Timing Role: High-efficiency intermediate converter feeding downstream LDOs; configured in forced CCM for predictable EMI spectrum.

Use Value: 350kHz–2.5MHz f_SW programmability allows EMI notch placement away from CAN FD (5Mbps) harmonics; PG signal coordinates multi-rail power-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
LM61480-Q1	Higher 3.5A rating, 2.1MHz fixed f_SW, no AAM mode, 17μA I_Q	Targeted at higher-current clusters; lacks light-load efficiency optimization for always-on modules	Select when >1A output or fixed-frequency simplicity outweighs ultra-low I_Q needs.
TPS62933-Q1	3A rating, 1.8V–18V input, 15μA I_Q, supports DCM but no AAM or BST refresh	Optimized for 12V systems only; limited dropout capability prevents use in 24V→3.3V high-duty-cycle apps	Prefer for cost-sensitive 12V-only designs where 24V cold-crank support is unnecessary.

Compared with LM61480-Q1 and TPS62933-Q1, MPQ9841GL-AEC1-Z uniquely combines AEC-Q100 Grade 1 qualification, 14μA I_Q, 80ns minimum on-time, and active BST refresh-making it the only choice for automotive 24V-input, always-on, space-constrained applications demanding both efficiency and high-duty-cycle reliability.

Availability

MPQ9841GL-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control modules requiring stable component supply with full AEC-Q100 traceability and long-term production support.

Supply support for MPQ9841GL-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 analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ9841 product line delivers AEC-Q100-qualified, low-I_Q DC/DC converters optimized for automotive subsystems where cold-crank resilience, EMI compliance, and extended temperature operation are mandatory.

FAQ

What is the maximum allowable input voltage for MPQ9841GL-AEC1-Z?

The absolute maximum input voltage is 40V, but the recommended operating range is 3.3V to 36V. Operation above 36V risks exceeding internal MOSFET breakdown limits and invalidates AEC-Q100 qualification margins. Sustained 36V input is supported only with adequate thermal design (θ_JA ≤ 48°C/W).

Can MPQ9841GL-AEC1-Z operate in 100% duty cycle mode?

No-it cannot achieve true 100% duty cycle, but its BST refresh circuit enables reliable operation up to ~98% effective duty cycle by forcing low-side conduction to recharge the bootstrap capacitor. This supports V_OUT ≥ 0.95×V_IN (e.g., 12V→11.4V) without gate-drive collapse.

How does the SYNC pin control forced CCM versus AAM modes?

SYNC must be set *before* startup: drive low (<0.4V) to enable AAM for light-load efficiency, or high (>1.8V) to force CCM for fixed-frequency ripple control. During operation, SYNC can resynchronize switching but does not change mode-mode selection is latched at power-on reset.

Is external compensation required for the MPQ9841GL-AEC1-Z control loop?

No-internal compensation is fully optimized for standard 4.7µH–10µH inductors and ceramic output capacitors. The integrated network eliminates need for external RC networks, reducing BOM count and layout sensitivity while maintaining phase margin >45° across all operating conditions.

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 VCC regulator, bypassing the VIN-to-VCC linear regulator. Use it when VIN > 12V to reduce thermal dissipation and improve full-load efficiency by up to 2.5%; leave floating or tied to GND if unused.

Does MPQ9841GL-AEC1-Z support output voltages below 3.3V?

Yes-the adjustable version (e.g., MPQ9841GL-AEC1-Z) supports any V_OUT ≥ 0.8V using the FB pin and resistor divider. Fixed-output variants include 3.3V and 5V; sub-3.3V outputs (e.g., 1.8V, 2.5V) are achievable with appropriate divider ratio and stability validation.

How is thermal performance affected by the wettable flank QFN package?

The wettable flank feature enables automated optical inspection (AOI) of solder joints, improving manufacturing yield and field reliability. Thermally, it provides identical θ_JA (48°C/W) and θ_JC (11°C/W) to standard QFN-16-performance depends entirely on PCB copper area, via count, and thermal pad solder coverage.

MPQ9841GL-AEC1-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-AEC1-Z FAQ

1.How can I place an order for MPQ9841GL-AEC1-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ9841GL-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 MPQ9841GL-AEC1-Z reliable?

The price and inventory of MPQ9841GL-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 MPQ9841GL-AEC1-Z is usually 5 days.

3.What payment methods are accepted for MPQ9841GL-AEC1-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ9841GL-AEC1-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ9841GL-AEC1-Z?

MPQ9841GL-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ9841GL-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 MPQ9841GL-AEC1-Z?

For technical support, including MPQ9841GL-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ9841GL-AEC1-Z requirements.

6.How does Aetrix verify that MPQ9841GL-AEC1-Z is sourced from the original manufacturer or authorized distributors?

All MPQ9841GL-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 MPQ9841GL-AEC1-Z meets industry standards.

7.What is the process for return or replacement of MPQ9841GL-AEC1-Z?

All MPQ9841GL-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ9841GL-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 MPQ9841GL-AEC1-Z part is unused and in its original packaging.

Return procedure for MPQ9841GL-AEC1-Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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