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

Monolithic Power Systems Inc. MPQ9840GL-Z

Name: MPQ9840GL-Z
Brand: Monolithic Power Systems Inc.
SKU: MPQ9840GL-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPQ9840GL-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 16-PowerVQFN

Datasheet:: MPQ9840GL-Z.pdf

Description:: IC REG BUCK ADJ 3.5A 16QFN

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Product details

Overview

MPQ9840GL-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 current across a 3.3V–36V input range, supports 350kHz–2.5MHz programmable switching frequency, and achieves 14μA no-load quiescent current-enabling use in automotive infotainment power rails and ADAS camera modules requiring high efficiency at light load.

For engineers reviewing the MPQ9840GL-Z datasheet, MPQ9840GL-Z pinout, MPQ9840GL-Z application, or MPQ9840GL-Z equivalent, this device is selected for its ultra-low IQ in battery-backed systems, AEC-Q100 qualification for under-hood deployment, precise 0.8V feedback reference, hiccup-mode over-current protection, and QFN-16 (3mm×4mm) wettable flank package supporting automated optical inspection.

Technical Context

The MPQ9840GL-Z employs peak-current-mode control with internal error amplifier and optimized compensation network, enabling fast transient response and stable loop behavior without external compensation components. Its dual-mode operation-selectable forced CCM or Advanced Asynchronous Mode (AAM)-is controlled via the SYNC pin before startup, directly determining light-load efficiency strategy and ripple profile.

Bootstrap refresh logic maintains BST-to-SW voltage above 2.5V to sustain high-duty-cycle operation; when BST/SW drops below threshold, the low-side FET is actively turned on to recharge the bootstrap capacitor. The internal 5V VCC regulator operates across full VIN range, while optional BIAS pin connection (5V–18V) reduces thermal stress and improves efficiency in high-input-voltage applications.

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	3.5A continuous - sustained across full temperature range (-40°C to +125°C) with proper PCB thermal design per θJA = 48°C/W.
Quiescent Current	14μA at no load - enables >1-year battery life in always-on vehicle telematics modules powered by 12V lead-acid or LiFePO₄.
Switching Frequency	350kHz to 2.5MHz - programmable via resistor or external clock; avoids AM radio band and enables compact magnetics in space-constrained ECUs.
Feedback Reference	0.8V ±1.5% - precision reference enables accurate output regulation for 1.2V, 1.8V, 3.3V, or 5V rails using standard resistor dividers.
Protection Features	OCP (hiccup), SCP, thermal shutdown, UVLO - autonomous fault recovery without host intervention; PG signal confirms ±10% output regulation.
AEC-Q100 Grade	Grade-1 (−40°C to +125°C TJ) - qualified for engine compartment and front-end module applications per automotive reliability standards.

Pinout & Package

MPQ9840GL-Z is housed in a thermally enhanced QFN-16 (3mm × 4mm) package with wettable flanks for solder joint inspection. Exposed thermal pad (Pin 16) must be connected to a solid PGND copper pour with ≥6 thermal vias for optimal thermal performance.

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 circuitry and high-side switch; requires local 10µF ceramic decoupling adjacent to pin.
3,10 (SW)	Power switch node	Drives external inductor; pins internally shorted-must share single low-inductance SW trace and ground return path.
4,9 (PGND)	Power ground	High-current return for MOSFETs; isolated from AGND and connected to thermal pad via dedicated copper pour.
5 (EN)	Enable control	Digital enable with 0.9V–1.2V threshold; must be actively driven-never left floating-to ensure deterministic startup/shutdown.
6 (SYNC)	Frequency sync & mode select	Accepts 350kHz–2.5MHz external clock; logic level before startup selects AAM (low) or forced CCM (high).
7 (PG)	Power-good indicator	Open-drain output asserting high when VOUT is within ±10% of target; requires external pull-up to regulated rail.
8 (BIAS)	Efficiency-boosting bias supply	Accepts 5V–18V external source to reduce internal LDO dissipation; float or tie to GND if unused.
11 (BST)	Bootstrap supply	Connects to SW via 0.1µF–1µF ceramic capacitor; internal charge pump maintains ~5V gate drive for HS-FET.
12 (VCC)	Internal regulator output	5V supply for control logic; requires ≥1µF local decoupling; sourced from VIN or BIAS depending on configuration.
13 (AGND)	Analog ground reference	Low-noise reference for FB, SS, and error amplifier; must be routed separately from PGND and joined at single point.
14 (SS)	Soft-start timing	10µA current source charges external capacitor; sets ramp time for output voltage-floating enables 0.7ms internal default.
15 (FB)	Feedback input	Monitors output via resistor divider; 0.8V reference enables adjustable outputs; fixed versions connect FB directly to VOUT.
16 (FREQ)	Frequency programming	Resistor-to-GND sets switching frequency per f = 1.11 MHz / R_FREQ(kΩ); enables precise EMI tuning and layout optimization.

Key Features

Feature	Design Value
Ultra-low quiescent current	14μA no-load IQ enables >10-year shelf life in automotive key-fob receivers and tire pressure sensors.
Integrated power MOSFETs	125mΩ HS + 55mΩ LS FETs eliminate external discrete switches and gate drivers-reducing BOM count and layout area by 30%.
Programmable minimum on-time	80ns minimum on-time supports high VIN-to-VOUT ratios (e.g., 24V→3.3V at 13.8% duty cycle) without pulse-skipping instability.
Wettable flank QFN package	QFN-16 (3mm×4mm) with solderable side walls enables AOI-compatible assembly and reliable reflow inspection for automotive production.
AEC-Q100 Grade-1 qualification	Validated for −40°C to +125°C junction temperature with HTOL, TC, UHAST, and ESD testing-meets ISO/TS 16949 requirements.

Applications

Automotive Infotainment

ADAS Camera Module

Use Scenario: Powering SoC core voltage (1.2V/3A) and DDR memory (1.35V/2A) in head-unit systems with 12V battery input.

IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated, low-noise power with fast load-transient response to handle video decode bursts.

Use Value: 14μA IQ extends standby time during vehicle sleep mode; AEC-Q100 Grade-1 ensures reliability across temperature cycling in dashboard environments.

Use Scenario: Generating 3.3V/1.2A for image sensor and ISP in rear-view camera with wide input range covering cold-crank (6V) and load-dump (40V).

IC Role / Device Role / Timing Role: Input-stage buck converter providing clean, stable rail with hiccup OCP to survive reverse-battery and load-dump transients.

Use Value: 36V absolute max rating and built-in SCP protect against automotive transients; PG signal enables firmware-controlled power sequencing.

Industrial Telematics Gateway

Electric Power Steering (EPS) Sensor Interface

Use Scenario: Supplying 5V/2A to cellular modem, GNSS receiver, and CAN transceiver in fleet-tracking units operating on 24V truck batteries.

IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter enabling long-term operation on backup supercapacitors during main power loss.

Use Value: 2μA shutdown current preserves energy during GPS-sleep cycles; SYNC pin allows synchronization to system clock to reduce conducted EMI peaks.

Use Scenario: Providing isolated 3.3V/0.5A for torque sensor signal conditioning and microcontroller in EPS control unit exposed to engine bay heat.

IC Role / Device Role / Timing Role: Safety-critical auxiliary power rail with thermal shutdown and PG monitoring for ASIL-B functional safety compliance.

Use Value: 125°C max operating junction temperature and robust BST refresh support continuous operation at 105°C ambient in EPS housings.

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, 3.3V–36V input, 17μA IQ, QFN-10 (3mm×3mm)	Limited to 2A; smaller package but lower thermal margin; lacks PG and SYNC functionality	Select when board space is critical and load current ≤2A; not suitable for 3.5A ADAS or infotainment rails.
TPS543320RTVR	3A output, 4.5V–20V input, 25μA IQ, 2.2MHz max f_SW, BGA-18	Narrower input range excludes 36V automotive battery compatibility; higher IQ reduces battery runtime	Prefer for industrial 12V/24V systems where BGA assembly is acceptable and 36V cold-crank support is unnecessary.

Compared with MPQ4420AGL-AEC1-Z and TPS543320RTVR, the MPQ9840GL-Z uniquely combines 3.5A capability, 36V input, AEC-Q100 Grade-1, and 14μA IQ in a wettable-flank QFN-making it the only option qualified for high-current, battery-backed automotive subsystems requiring extended sleep duration and transient robustness.

Availability

MPQ9840GL-Z is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, industrial telematics gateways, and electric power steering sensor interfaces requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.

Supply support for MPQ9840GL-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 MPQ9840 belongs to MPS's automotive-grade DC/DC converter product line, engineered specifically for under-hood and safety-critical vehicle subsystems demanding AEC-Q100 qualification, ultra-low quiescent current, and robust transient immunity.

FAQ

What is the maximum allowable input voltage for MPQ9840GL-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 degrading long-term reliability-even if within absolute max ratings. Automotive cold-crank (6V) and load-dump (40V) transients are handled by internal protection circuits, but sustained operation above 36V is not specified or guaranteed.

Can MPQ9840GL-Z operate with a 24V input and 3.3V output at 3.5A?

Yes-this is a validated operating condition. At VIN = 24V, VOUT = 3.3V, and IOUT = 3.5A, the device achieves >92% efficiency in forced CCM mode with appropriate inductor (e.g., 2.2µH, 5.5mΩ DCR) and layout. Minimum on-time (80ns) supports the required ~13.8% duty cycle without pulse skipping, ensuring stable regulation.

How does the PHASE pin affect synchronization in multi-rail designs?

The PHASE pin selects 0° (in-phase) or 180° (out-of-phase) alignment between the MPQ9840GL-Z switching node and an external SYNC clock. When multiple converters share one SYNC source, configuring alternating PHASE states reduces input ripple current and lowers RMS input capacitor stress-critical for minimizing EMI in multi-rail ADAS domains.

Is external soft-start mandatory, or can the internal setting be used?

External soft-start is optional. Pin 14 (SS) floats to activate the internal 0.7ms soft-start, which is sufficient for most applications. An external capacitor (e.g., 47nF) extends soft-start time linearly (t_SS ≈ 0.1V/10µA × C_SS) to limit inrush into large output capacitors or downstream hot-swap controllers.

Does the BIAS pin require an external supply in all applications?

No-BIAS is optional. When VIN ≤ 15V, internal VCC regulation is efficient and thermal impact is minimal. For VIN > 18V (e.g., 24V/36V automotive), connecting BIAS to a clean 5V source reduces power dissipation by ~300mW and improves efficiency by 0.8–1.2%, especially at full load and high ambient temperatures.

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

When duty cycle approaches 100%, BST-to-SW voltage drops due to insufficient off-time for bootstrap capacitor recharge. The BST refresh circuit detects <2.5V BST/SW and forces the low-side FET on briefly to recharge the capacitor from PGND-enabling stable operation down to ~0.9×VOUT without external boost circuitry.

How is power-good (PG) assertion accuracy defined in the MPQ9840GL-Z?

PG asserts high when FB voltage reaches 85–95% of VREF (0.8V), and deasserts when FB falls to 79–89% of VREF. This 10% window provides noise immunity against output ripple while ensuring timely detection of overvoltage or undervoltage faults-critical for fail-safe automotive power sequencing.

MPQ9840GL-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:: 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

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

MPQ9840GL-Z FAQ

1.How can I place an order for MPQ9840GL-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ9840GL-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 MPQ9840GL-Z reliable?

The price and inventory of MPQ9840GL-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ9840GL-Z is usually 5 days.

3.What payment methods are accepted for MPQ9840GL-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ9840GL-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ9840GL-Z?

MPQ9840GL-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ9840GL-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 MPQ9840GL-Z?

For technical support, including MPQ9840GL-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ9840GL-Z requirements.

6.How does Aetrix verify that MPQ9840GL-Z is sourced from the original manufacturer or authorized distributors?

All MPQ9840GL-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 MPQ9840GL-Z meets industry standards.

7.What is the process for return or replacement of MPQ9840GL-Z?

All MPQ9840GL-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ9840GL-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 MPQ9840GL-Z part is unused and in its original packaging.

Return procedure for MPQ9840GL-Z:

1.Submit a request within 90 days.

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

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