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

Monolithic Power Systems Inc. MPQ9840GLE-33-AEC1-Z

Name: MPQ9840GLE-33-AEC1-Z
Brand: Monolithic Power Systems Inc.
SKU: MPQ9840GLE-33-AEC1-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPQ9840GLE-33-AEC1-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 16-VQFN

Datasheet:: MPQ9840GLE-33-AEC1-Z.pdf

Description:: IC REG BUCK 3.3V 3.5A 16QFN

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Product details

Overview

MPQ9840GLE-33-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 55mΩ low-side MOSFETs. It delivers 3.5A continuous output at fixed 3.3V from a 3.3V–36V input, operates down to 14μA no-load quiescent current, supports 350kHz–2.5MHz programmable switching frequency, and features power-good (PG) signaling and wettable flank QFN-16 packaging for automotive ADAS and infotainment power rails.

For engineers reviewing the MPQ9840GLE-33-AEC1-Z datasheet, MPQ9840GLE-33-AEC1-Z pinout, MPQ9840GLE-33-AEC1-Z application, or MPQ9840GLE-33-AEC1-Z equivalent, this part is selected for automotive-grade 3.3V core supply where low IQ, wide VIN, AEC-Q100 compliance, and EMI-controlled operation in constrained PCB space are mandatory design requirements.

Technical Context

The MPQ9840GLE-33-AEC1-Z uses peak-current-mode control with internal error amplifier and 0.8V reference for precise regulation, 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 conditions: CCM maintains fixed frequency and low ripple under medium-to-heavy loads, while AAM enables PSM at light/no load to sustain 14μA IQ.

Bootstrap charging and BST refresh circuitry support high-duty-cycle operation up to ~100%, critical for automotive cold-crank scenarios (e.g., 4.5V VIN → 3.3V VOUT). The integrated PG open-drain output asserts when VOUT reaches ±10% of nominal, and SYNC/PHASE pins enable multi-phase synchronization and phase alignment in distributed power systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3.3V to 36V - supports automotive battery transients including cold-crank (4.5V) and load-dump (40V absolute max).
Output Voltage	Fixed 3.3V ±1% - eliminates external feedback resistors; optimized for MCU, sensor, and interface IC core supplies.
Continuous Output Current	3.5A - sustained delivery with thermal shutdown at 170°C and derating per θJA = 48°C/W on 4-layer PCB.
No-Load Quiescent Current	14μA - enables >1-year battery standby in always-on automotive modules without compromising wake-up responsiveness.
Switching Frequency Range	350kHz to 2.5MHz - programmable via FREQ resistor or external SYNC clock; avoids AM/FM radio bands and enables compact magnetics.
Protection Features	OCP (hiccup), SCP, thermal shutdown, UVLO (2.8V rising), and PG monitoring - ensures robust fault recovery in harsh automotive environments.
Package & Qualification	QFN-16 (3mm × 4mm) with wettable flanks; AEC-Q100 Grade-1 (−40°C to +125°C TJ) - qualified for front-end, body control, and ADAS ECUs.

Pinout & Package

MPQ9840GLE-33-AEC1-Z is housed in a thermally enhanced, wettable-flank QFN-16 package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad. Pin 1 is marked by a dot; pins 3 & 10 are internally shorted SW nodes; pins 4 & 9 are PGND; AGND (pin 13) and PGND must be separated and joined only at a single point near the IC.

Pin/Terminal	Circuit Role	Design Meaning
1 PHASE	Synchronization phase control	Selects in-phase or 180° out-of-phase sync relative to external clock; tie to GND if unused to prevent noise coupling.
2 VIN	Main power input	Accepts 3.3V–36V; requires local 10µF ceramic decoupling to PGND to suppress switching noise and voltage spikes.
3,10 SW	Switch node	High-frequency drain connection of internal HS-FET; shared between pins for lower inductance and improved thermal spreading.
4,9 PGND	Power ground return	Low-impedance return path for HS/LS switching currents; must connect directly to thermal pad and use multiple vias to inner ground planes.
5 EN	Enable control	Logic-level input (0.9V–1.2V threshold); pull below 0.9V to enter 2µA shutdown; never float.
6 SYNC	Frequency sync & mode select	Accepts 350kHz–2.5MHz external clock; low at startup enables AAM; high enables forced CCM; also controls phase alignment via PHASE pin.
7 PG	Power-good indicator	Open-drain output asserting high when VOUT is within ±10% of 3.3V; requires external pull-up to 3.3V or 5V rail.
8 BIAS	Efficiency-boost bias supply	Accepts 5V–18V external bias to reduce internal LDO losses; improves full-load efficiency by ~1.5% and thermal performance.
11 BST	Bootstrap supply	Charges internal HS gate driver; requires 0.1µF–1µF ceramic capacitor between BST and SW; critical for high-duty-cycle operation.
12 VCC	Internal regulator output	5V regulated supply for control logic; requires ≥1µF ceramic decoupling to AGND; powered from VIN or BIAS if connected.
13 AGND	Analog ground reference	Reference for FB, SS, and error amplifier; must be isolated from PGND except at single-point star ground near IC.
14 SS	Soft-start timing	External capacitor sets start-up ramp time (10µA constant current source); floating defaults to 0.7ms internal soft-start.
15 FB	Feedback input	Internally tied to 3.3V output (fixed version); no external divider required - simplifies layout and improves noise immunity.
16 FREQ	Frequency programming	Resistor to GND sets switching frequency (e.g., 180kΩ = ~475kHz); enables precise EMI tuning and magnetics optimization.

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.
14μA no-load quiescent current	Enables >10-year battery hold-up in always-on telematics modules without compromising start-up speed or regulation accuracy.
Integrated 125mΩ/55mΩ MOSFETs	Eliminates external power stage components; reduces BOM count, layout area, and conduction losses at 3.5A output.
80ns minimum on-time	Supports high VIN-to-VOUT ratios (e.g., 24V→3.3V) at 2.5MHz, enabling ultra-compact designs with small inductors.
Wettable flank QFN-16 package	Enables automated optical inspection (AOI) of solder joints - critical for zero-defect automotive manufacturing requirements.
EMI-compliant design (CISPR 25 Class 5)	Meets stringent automotive radiated/conducted emissions limits with standard layout and recommended EMI filters.

Applications

ADAS Camera Module Power

Automotive Infotainment SoC Core

Use Scenario: Dual-camera front-facing ADAS system requiring clean, low-noise 3.3V supply for image sensors and ISP processors under engine vibration and temperature cycling.

IC Role / Device Role / Timing Role: Primary 3.3V buck converter delivering 3.5A with <10mVpp output ripple and fast load-step response (<10µs) to handle burst-mode imaging.

Use Value: AEC-Q100 qualification ensures functional safety compliance; 14μA IQ extends parking-mode camera recording duration; wettable flanks guarantee solder joint reliability in high-vibration environments.

Use Scenario: Central infotainment head unit powering a quad-core application processor's I/O and memory interface rails from a 12V vehicle battery.

IC Role / Device Role / Timing Role: Fixed-output 3.3V supply for LPDDR4 I/O, PCIe PHY, and display interface logic with tight regulation (±1%) and PG sequencing control.

Use Value: Programmable 350kHz–2.5MHz switching avoids AM band interference; SYNC/PHASE pins enable synchronized multi-rail operation to reduce system-level EMI peaks.

Body Control Module (BCM) Microcontroller

Automotive Gateway ECU Power

Use Scenario: Low-power BCM managing door locks, lighting, and window controls, operating continuously from vehicle battery with strict leakage current limits.

IC Role / Device Role / Timing Role: Always-on 3.3V supply for ARM Cortex-M7 microcontroller and CAN FD transceivers, supporting deep-sleep wake-up within 50µs.

Use Value: 2µA shutdown current and 14μA no-load IQ minimize parasitic drain; AAM mode maintains >85% efficiency at 1mA load; PG signal enables safe firmware boot validation.

Use Scenario: Zonal gateway ECU consolidating CAN, LIN, Ethernet, and wireless connectivity, requiring tightly regulated 3.3V for communication PHYs and security accelerators.

IC Role / Device Role / Timing Role: High-reliability 3.3V rail with hiccup OCP and thermal shutdown, supporting hot-plug insertion and fault containment across multiple bus interfaces.

Use Value: Integrated protection prevents cascade failures during bus shorts; QFN-16 thermal pad dissipates 2.6W at TA=25°C, enabling fanless operation in sealed enclosures.

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
TPS543320RTWR	4A output, 4.5V–18V input, 2.5V–5.5V adjustable VOUT; no fixed 3.3V option; requires external feedback network.	Targets industrial servers and telecom; lacks AEC-Q100 qualification and automotive temp range.	Select when higher output current and wider VOUT adjustability outweigh automotive qualification needs.
LM61480QRNXTQ1	5A output, 3.5V–36V input, fixed 3.3V version available; 15μA IQ; supports spread-spectrum modulation.	Includes spread-spectrum EMI reduction but larger QFN-16 (4mm×4mm); no wettable flanks.	Prefer when CISPR 25 Class 5 margin is marginal and spread-spectrum is needed; verify AOI compatibility.

Compared with TPS543320RTWR and LM61480QRNXTQ1, MPQ9840GLE-33-AEC1-Z uniquely combines AEC-Q100 Grade-1, wettable flanks, fixed 3.3V output, and 14μA IQ in a 3mm×4mm footprint - making it optimal for space-constrained, safety-critical automotive modules where solder joint inspection and ultra-low standby drain are non-negotiable.

Availability

MPQ9840GLE-33-AEC1-Z is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC power rails, and body control module microcontroller supplies requiring stable component supply, long-term lifecycle assurance, and zero-defect traceability.

Supply support for MPQ9840GLE-33-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 over two decades of leadership in DC/DC conversion, motor drivers, and LED lighting controllers.

The MPQ9840 product line is designed specifically for automotive power systems demanding AEC-Q100 qualification, ultra-low quiescent current, and high-efficiency synchronous buck conversion in compact packages - targeting next-generation E/E architectures.

FAQ

What is the purpose of the BIAS pin, and how should it be used?

The BIAS pin accepts an external 5V–18V supply to power the internal control circuitry, bypassing the VIN-regulated VCC LDO. When connected, it reduces power dissipation and improves full-load efficiency by ~1.5%. If unused, BIAS must be floated or tied to GND - never left open - to avoid undefined behavior or increased IQ.

Can MPQ9840GLE-33-AEC1-Z operate with input voltage below 3.3V?

No. The absolute minimum input voltage is 3.3V per datasheet specifications, and the under-voltage lockout (UVLO) rising threshold is 2.8V. Operation below 3.3V violates the recommended operating condition and risks failure to regulate or maintain PG assertion. For sub-3.3V inputs, a different converter architecture is required.

How does the PHASE pin affect multi-phase synchronization?

The PHASE pin selects whether the internal oscillator aligns in-phase or 180° out-of-phase with the external SYNC clock. Pulling PHASE high yields in-phase alignment; pulling low yields 180° offset. This enables interleaved operation across multiple MPQ9840 devices to reduce input/output ripple and improve thermal distribution in high-current systems.

Is external compensation required for stable operation?

No. The MPQ9840GLE-33-AEC1-Z features an optimized internal compensation network tailored for its fixed 3.3V output configuration. No external compensation components are needed - simplifying design, reducing BOM cost, and improving layout robustness compared to adjustable-output buck regulators.

What is the function of the BST refresh feature during dropout operation?

BST refresh actively monitors the BST-to-SW voltage and forces the low-side MOSFET on when BST–SW falls below 2.5V. This recharges the bootstrap capacitor during high-duty-cycle conditions (e.g., 24V→3.3V), enabling reliable high-side gate drive and sustaining operation up to ~100% duty cycle - critical for automotive cold-crank resilience.

Does the fixed 3.3V version support remote sensing?

No. The MPQ9840GLE-33-AEC1-Z connects the FB pin directly to the internal 3.3V output node and lacks dedicated remote sense pins (e.g., VOSNS+/VOSNS−). For applications requiring millivolt-level output accuracy under high-current PCB trace drops, a discrete resistor-divider-based adjustable version (e.g., MPQ9840GLE-AEC1) with external feedback is required.

How is soft-start time determined when using the SS pin?

Soft-start time is set by an external capacitor from SS to AGND, charged by a precision 10µA current source. Time to reach 0.8V (which enables full regulation) is tSS ≈ (0.8V × CSS) / 10µA. For example, a 100nF capacitor yields ~8ms soft-start. Floating SS activates the internal 0.7ms setting.

MPQ9840GLE-33-AEC1-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: MPQ

Package/Case:: 16-VQFN

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):: 3.3V

Voltage - Input (Max):: 36V

Voltage - Output (Min/Fixed):: 3.3V

Voltage - Output (Max):: -

Current - Output:: 3.5A

Frequency - Switching:: 350kHz ~ 2.5MHz

Synchronous Rectifier:: Yes

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: 16-QFN (3x4)

MPQ9840GLE-33-AEC1-Z FAQ

1.How can I place an order for MPQ9840GLE-33-AEC1-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ9840GLE-33-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 MPQ9840GLE-33-AEC1-Z reliable?

The price and inventory of MPQ9840GLE-33-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 MPQ9840GLE-33-AEC1-Z is usually 5 days.

3.What payment methods are accepted for MPQ9840GLE-33-AEC1-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ9840GLE-33-AEC1-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ9840GLE-33-AEC1-Z?

MPQ9840GLE-33-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ9840GLE-33-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 MPQ9840GLE-33-AEC1-Z?

For technical support, including MPQ9840GLE-33-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ9840GLE-33-AEC1-Z requirements.

6.How does Aetrix verify that MPQ9840GLE-33-AEC1-Z is sourced from the original manufacturer or authorized distributors?

All MPQ9840GLE-33-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 MPQ9840GLE-33-AEC1-Z meets industry standards.

7.What is the process for return or replacement of MPQ9840GLE-33-AEC1-Z?

All MPQ9840GLE-33-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ9840GLE-33-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 MPQ9840GLE-33-AEC1-Z part is unused and in its original packaging.

Return procedure for MPQ9840GLE-33-AEC1-Z:

1.Submit a request within 90 days.

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

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