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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Monolithic Power Systems Inc. MPQ4425MGQB-AEC1-Z

Name: MPQ4425MGQB-AEC1-Z
Brand: Monolithic Power Systems Inc.
SKU: MPQ4425MGQB-AEC1-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPQ4425MGQB-AEC1-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: LED Drivers

Package:: 13-PowerVQFN

Datasheet:: MPQ4425MGQB-AEC1-Z.pdf

Description:: IC LED DRVR RGLTR PWM 1.5A 13QFN

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Product details

Overview

MPQ4425MGQB-AEC1-Z from Monolithic Power Systems is a synchronous step-down white LED driver IC with integrated 85mΩ/50mΩ MOSFETs, delivering 1.5A continuous output current across 4V–36V input range, operating at 2.2MHz fixed frequency, and qualified to AEC-Q100 Grade-1 for automotive lighting systems.

For engineers reviewing the MPQ4425MGQB-AEC1-Z datasheet, MPQ4425MGQB-AEC1-Z pinout, MPQ4425MGQB-AEC1-Z application, or MPQ4425MGQB-AEC1-Z equivalent, key selection considerations include its forced CCM mode, 0.2V feedback reference, PWM dimming support (100Hz–2kHz), fault indication (/FAULT open-drain), and CISPR25 Class 5 EMI compliance in automotive LED headlamp and DRL designs.

Technical Context

The MPQ4425MGQB-AEC1-Z uses peak-current-mode control with internal 0.2V reference and error amplifier driving COMP voltage to regulate LED current via external R_FB. It implements valley-current detection for over-current protection and maintains fixed-frequency operation down to no-load via forced continuous conduction mode.

Its bootstrap circuit supports high-side gate drive with internal UVLO (2.2V rising threshold), and frequency foldback reduces switching frequency to 1.1MHz above ~21V input or during short-circuit events. Thermal shutdown activates at 170°C with 30°C hysteresis, and /FAULT asserts low on LED open/short or thermal fault.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4V to 36V - supports full automotive battery range including cold-crank (4.5V) and load-dump (36V) transients.
Output Current	1.5A continuous - sufficient for multi-string or high-brightness single-string automotive LED arrays.
Switching Frequency	2.2MHz nominal (1.8–2.6MHz) - enables compact LC filter design and avoids AM radio band (0.53–1.71MHz).
Feedback Reference	0.2V ±4% - sets LED current via R_FB = 0.2V/I_LED; 133mΩ yields 1.5A with <±1% tolerance.
Internal MOSFET R_DS(on)	HS: 85mΩ, LS: 50mΩ - enables >90% efficiency at 12V_IN/36V_OUT with 2.2µH inductor and minimal thermal derating.
Dimming Support	PWM dimming 100Hz–2kHz on EN/DIM pin - provides linear brightness control without color shift; min 1.8V amplitude required.
EMI Compliance	CISPR25 Class 5 - meets stringent automotive radiated/conducted emissions limits with recommended layout and EMI filters.
Protection Features	OCP (valley-current detection), TSD (170°C trip), UVLO (3.5V rise/3.1V fall), fault reporting via /FAULT - enables robust system-level fault handling without external monitoring.

Pinout & Package

MPQ4425MGQB-AEC1-Z is housed in a wettable flank QFN-13 package (2.5mm × 3mm, 0.5mm pitch), optimized for automated optical inspection (AOI) and enhanced solder joint reliability in automotive applications.

Pin/Terminal	Circuit Role	Design Meaning
1, 2 IN	Power Input	4V–36V supply input; requires low-ESR ceramic decoupling (≥4.7µF + 0.1µF) placed adjacent to pins.
3 NC	No Connect	Unbonded die pad; must remain floating - no PCB trace or copper pour connection.
4 /FAULT	Fault Indicator	Open-drain output pulled low on LED open/short or thermal shutdown; requires external pull-up to VCC or bias rail.
5 EN/DIM	Enable & Dimming Control	Logic-enable input (1.45V rise threshold); accepts 100Hz–2kHz PWM for analog-equivalent dimming control.
6 FB	Current Sense Feedback	Connects to R_FB between LED– and PGND; 0.2V reference sets I_LED = 0.2V/R_FB.
7 VCC	Bias Supply	Internal 4.9V regulator output; decoupled with 0.1µF–0.22µF ceramic capacitor to PGND.
8 AGND	Analog Ground	Reference for FB, EN/DIM, and internal circuits; internally tied to PGND - no external connection needed.
9 SW	Switch Node	Drives external inductor; high di/dt node requiring short/wide copper trace and separation from sensitive analog paths.
10 BST	Bootstrap Supply	Connects to SW via 0.1µF BST capacitor and 20Ω series resistor to power high-side gate driver.
11–13 PGND	Power Ground	High-current return path for HS/LS FETs and inductor; requires dedicated copper pour with multiple thermal vias to inner ground plane.

Key Features

Feature	Design Value
Forced Continuous Conduction Mode (CCM)	Maintains fixed 2.2MHz switching from no-load to full 1.5A, minimizing output ripple and enabling predictable EMI filtering.
Wettable Flank QFN Package	Enables automated optical inspection of solder joints - critical for zero-defect requirements in automotive Tier-1 manufacturing.
AEC-Q100 Grade-1 Qualification	Rated for −40°C to +125°C junction temperature - validated for under-hood automotive LED lighting applications.
Integrated High- and Low-Side MOSFETs	Eliminates external switch count and layout complexity while optimizing R_DS(on) balance (85mΩ/50mΩ) for efficiency and thermal distribution.
CISPR25 Class 5 EMI Performance	Meets OEM-level radiated/conducted emissions limits with standard application circuit and recommended PCB layout - reduces pre-compliance debug time.
Valley-Current Detection OCP	Prevents runaway inductor current during overload or short-circuit by disabling HS-FET until valley current falls below threshold - improves fault resilience.

Applications

Automotive Daytime Running Lights (DRL)

Automotive Headlamp Low/High Beam

Use Scenario: Constant-current LED array powering front-facing DRL modules requiring stable luminance across battery voltage variation (9V–16V) and ambient temperature (−40°C to +85°C).

IC Role / Device Role / Timing Role: Primary LED current regulator with PWM dimming interface for adaptive brightness control and fault-safe shutdown.

Use Value: Delivers 1.5A at >92% efficiency with 2.2MHz switching, enabling compact heatsink-free design and meeting OEM EMI Class 5 requirements without added filtering.

Use Scenario: Dual-channel or matrix-based headlamp system where individual LED strings require independent current regulation and thermal monitoring.

IC Role / Device Role / Timing Role: Synchronous buck LED driver with /FAULT reporting for real-time open/short detection and thermal derating coordination across multiple channels.

Use Value: AEC-Q100 Grade-1 qualification and 170°C thermal shutdown ensure functional safety compliance; forced CCM eliminates audible noise at light load.

Automotive Fog Lamps

Commercial Vehicle Tail/Brake Lights

Use Scenario: High-reliability fog lamp module exposed to vibration, moisture, and wide temperature swings in off-road and heavy-duty applications.

IC Role / Device Role / Timing Role: Robust LED current controller with integrated OCP, TSD, and UVLO - eliminating need for external protection circuitry.

Use Value: Wettable flank QFN package ensures solder joint integrity after thermal cycling; 36V absolute max rating withstands load-dump transients up to ISO 7637-2 Pulse 5a.

Use Scenario: 24V commercial vehicle tail/brake light with multi-segment LED arrays requiring precise current matching and fault isolation per segment.

IC Role / Device Role / Timing Role: Single-chip LED driver supporting PWM dimming for brake vs. tail intensity differentiation and /FAULT signaling for CAN bus fault reporting.

Use Value: 4V–36V input range covers 12V/24V dual-system vehicles; 0.2V reference enables tight current matching (<±3%) across parallel channels using matched R_FB.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down LED driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM3409QMYX/NOPB	Adjustable 1.2MHz frequency; external MOSFETs; no integrated BST diode drive; 0.21V reference.	Requires external high-side/low-side FETs and gate drivers - increases BOM count and layout complexity.	Select when higher voltage (>40V) or custom frequency tuning is required; not drop-in compatible.
TPS92692QPWPRQ1	Current-mode boost/buck-boost capable; 0.1V reference; integrated N-channel MOSFET driver only; requires external high-side switch.	Supports wider topology flexibility but lacks integrated power switches - unsuitable for space-constrained buck-only designs.	Choose for multi-topology LED systems or when ultra-low reference voltage (0.1V) improves current-sense accuracy at low I_LED.

Compared with LM3409QMYX/NOPB and TPS92692QPWPRQ1, the MPQ4425MGQB-AEC1-Z offers lower system cost and smaller footprint due to fully integrated MOSFETs, fixed 2.2MHz operation, and wettable flank packaging - making it optimal for high-volume, space-limited automotive DRL and fog lamp modules.

Availability

MPQ4425MGQB-AEC1-Z is available at Aetrix Electronics and suitable for automotive daytime running lights, headlamp modules, fog lamps, and commercial vehicle tail/brake lighting requiring stable component supply, AEC-Q100 compliance, and production-ready EMI performance.

Supply support for MPQ4425MGQB-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 core expertise in DC/DC conversion, LED drivers, and motor control solutions.

The MPQ4425M product line delivers AEC-Q100-qualified synchronous buck LED drivers optimized for automotive exterior lighting, emphasizing integration, EMI robustness, and thermal reliability in harsh environments.

FAQ

What is the purpose of the NC pin (Pin 3) on the MPQ4425MGQB-AEC1-Z?

Pin 3 is a no-connect (NC) terminal with no internal bond wire or circuit connection. It must remain electrically floating - no PCB trace, copper pour, or solder mask opening should contact this pad. Leaving it unconnected prevents unintended coupling or parasitic effects that could impact stability or EMI performance.

Can the MPQ4425MGQB-AEC1-Z operate with an input voltage below 4V?

No. The absolute minimum operating input voltage is 4V per the Recommended Operating Conditions table. Below this, the internal regulator cannot sustain VCC at 4.9V, causing functional failure. The UVLO rising threshold is 3.5V, but reliable operation begins only at ≥4V - underscoring its design for 12V/24V automotive systems, not low-voltage portable applications.

How does the /FAULT pin behave during normal operation versus fault conditions?

During normal operation, /FAULT remains high-impedance and is pulled up externally (e.g., via 100kΩ to VCC), resulting in a logic-high state. It pulls low only during confirmed faults: LED open circuit (no current flow), LED short (excessive current triggering OCP), or die temperature exceeding 170°C (thermal shutdown). The 10μs delay ensures noise immunity against transient spikes.

Is the 2.2MHz switching frequency adjustable, and what happens if input voltage exceeds 21V?

The 2.2MHz frequency is fixed and non-adjustable. When input voltage rises above ~21V, the device enters frequency foldback mode, halving the switching frequency to 1.1MHz. This reduces switching losses and improves efficiency at high VIN, while maintaining regulation - a built-in feature requiring no external components or configuration.

What is the maximum allowable RMS current for the input capacitor, and how is it calculated?

The worst-case RMS input capacitor current equals half the maximum LED current (I_CIN(RMS) ≈ I_LED/2 = 0.75A for 1.5A output). This occurs at VIN = 2×V_OUT. Ceramic capacitors rated for ≥1A RMS (e.g., X5R/X7R 1206 or larger) are recommended, with a parallel 0.1µF/0603 capacitor placed directly at the IN–PGND pins to suppress high-frequency noise.

Does the MPQ4425MGQB-AEC1-Z support analog dimming, or is PWM dimming the only option?

Only PWM dimming is supported - applied directly to the EN/DIM pin with 100Hz–2kHz frequency and ≥1.8V amplitude. There is no analog dimming capability (e.g., variable reference or DAC interface). The IC interprets PWM duty cycle as proportional LED current, providing flicker-free, color-stable brightness control without altering current-sense gain or reference voltage.

How does the wettable flank QFN package improve manufacturability in automotive production?

The wettable flank design exposes vertical sidewalls of the QFN leads, enabling automated optical inspection (AOI) to verify solder fillet formation and voiding - a critical zero-defect requirement for automotive electronics. This eliminates reliance on X-ray inspection for hidden solder joints and improves first-pass yield in reflow processes used by Tier-1 suppliers.

MPQ4425MGQB-AEC1-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 13-PowerVQFN

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: DC DC Regulator

Topology:: Step-Down (Buck)

Internal Switch(s):: Yes

Number of Outputs:: 1

Voltage - Supply (Min):: 4V

Voltage - Supply (Max):: 36V

Voltage - Output:: -

Current - Output / Channel:: 1.5A

Frequency:: 2.2MHz

Dimming:: PWM

Applications:: Lighting

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

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 13-QFN (2.5x3)

MPQ4425MGQB-AEC1-Z FAQ

1.How can I place an order for MPQ4425MGQB-AEC1-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ4425MGQB-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 MPQ4425MGQB-AEC1-Z reliable?

The price and inventory of MPQ4425MGQB-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 MPQ4425MGQB-AEC1-Z is usually 5 days.

3.What payment methods are accepted for MPQ4425MGQB-AEC1-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4425MGQB-AEC1-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ4425MGQB-AEC1-Z?

MPQ4425MGQB-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ4425MGQB-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 MPQ4425MGQB-AEC1-Z?

For technical support, including MPQ4425MGQB-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4425MGQB-AEC1-Z requirements.

6.How does Aetrix verify that MPQ4425MGQB-AEC1-Z is sourced from the original manufacturer or authorized distributors?

All MPQ4425MGQB-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 MPQ4425MGQB-AEC1-Z meets industry standards.

7.What is the process for return or replacement of MPQ4425MGQB-AEC1-Z?

All MPQ4425MGQB-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4425MGQB-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 MPQ4425MGQB-AEC1-Z part is unused and in its original packaging.

Return procedure for MPQ4425MGQB-AEC1-Z:

1.Submit a request within 90 days.

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

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