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

Monolithic Power Systems Inc. MPQ3386DR-AEC1-LF-Z

Name: MPQ3386DR-AEC1-LF-Z
Brand: Monolithic Power Systems Inc.
SKU: MPQ3386DR-AEC1-LF-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MPQ3386DR-AEC1-LF-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: LED Drivers

Package:: 24-VFQFN Exposed Pad

Datasheet:: MPQ3386DR-AEC1-LF-Z.pdf

Description:: IC LED DRIVER RGLTR PWM 24QFN

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Product details

Overview

MPQ3386DR-AEC1-LF-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified 6-channel white LED driver IC with integrated step-up converter, designed for automotive LCD backlighting. It delivers up to 50V output from 4.5–25V input, regulates 20mA per string with ±3% matching accuracy, and supports selectable 1.25MHz/625kHz switching frequency and dual-mode PWM/DC dimming control.

For engineers reviewing the MPQ3386DR-AEC1-LF-Z datasheet, MPQ3386DR-AEC1-LF-Z pinout, MPQ3386DR-AEC1-LF-Z application, or MPQ3386DR-AEC1-LF-Z equivalent, this device is selected for high-reliability automotive display systems requiring precise multi-string current regulation, fault-protected operation, and flexible brightness control under wide ambient light conditions.

Technical Context

The MPQ3386DR-AEC1-LF-Z integrates a fixed-frequency peak-current-mode boost controller with six matched open-drain current sinks. Its internal 5V LDO (VCC) powers gate drivers and logic, while dual power grounds (PGND1/PGND2) and paralleled SW1/SW2 outputs support high-current inductor routing. The 600mV LED current-sense reference minimizes conduction loss across strings.

Dimming is implemented via programmable DPWM generation using FSET capacitor timing (100Hz–2kHz), with four supported modes: external PWMI PWM, filtered PWMO PWM, direct negative-logic PWMO PWM, or analog DC voltage (0.2–1.2V) on PWMO. Protection includes OVP (programmable via resistor divider), open/short LED detection (175mV/5.5V thresholds), and thermal shutdown at 150°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 25V - supports wide automotive battery rail including cold-crank and load-dump transients.
Max Output Voltage	50V - sufficient to drive up to 10 white LEDs in series per string (3.2V typical V_F).
LED Current Accuracy	±3% matching between 6 strings - ensures uniform luminance across large-area displays without per-string calibration.
Switching Frequency	Selectable 1.25MHz or 625kHz - enables optimization of inductor size (10µH vs 22µH) and EMI profile.
Dimming Control	PWM or DC input on PWMO/PWMI - eliminates audible noise by supporting >1kHz DPWM frequencies and negative-polarity analog dimming.
LED Regulation Voltage	600mV typical - reduces power dissipation in current sinks and improves overall efficiency at full load.
OVP Threshold	Programmable via resistor divider (1.23V reference) - allows precise overvoltage cutoff aligned with LED string max voltage.
Operating Temp Range	−40°C to +125°C junction - meets AEC-Q100 Grade 1 requirements for under-hood and dashboard display applications.

Pinout & Package

MPQ3386DR-AEC1-LF-Z uses a thermally enhanced QFN-24 (4mm × 4mm) package with exposed thermal pad connected to GND. Pin 1 identification is marked via corner chamfer (Option A) or radius (Option B); land pattern follows JEDEC MO-220 VGGD standard.

Pin/Terminal	Circuit Role	Design Meaning
1 EN	Enable Input	Active-high logic control; must be driven - floating state disables device.
2 OSC	Frequency Select	Ground = 625kHz; float or VCC = 1.25MHz - sets boost switching frequency without external clock.
3 FSET	DPWM Timing	Connects to GND via capacitor (CFSET) to set dimming frequency: f_DPWM = 3.5µF / C_FSET.
4 PWMO	Dimming Filter Output / DC Input	Outputs filtered PWM DC level or accepts 0.2–1.2V analog dimming signal - negative polarity control.
5 GND	Analog Ground	Reference for control circuitry; separate from PGND1/PGND2 to minimize noise coupling.
6 PWMI	PWM Signal Input	Accepts 100Hz–50kHz external PWM; internal 400kΩ pull-up enables filtering into PWMO.
7–13 LED6–LED1	String Cathode Outputs	Open-drain current sinks - each drives one LED string cathode; unused pins tied to VOUT.
11 ISET	Current Programming	Connects to GND via R_SET; sets string current as I_LED = 1.21V / R_SET (e.g., 60.4kΩ → 20mA).
15 VOUT	Boost Output	Main high-voltage rail - connects to LED anodes and output capacitor; swings up to 50V.
16 OVP	Over-Voltage Sense	Resistor divider input; triggers shutdown when voltage reaches 1.23V - protects against open-string faults.
17–18 PGND1/PGND2	Power Ground	High-current return paths for boost switch; must be shorted externally and routed separately from AGND.
19–20 SW1/SW2	Boost Switch Outputs	Paralleled MOSFET drains - connect to inductor and rectifier; rated for 50V swing and 2.5A peak current.
21 VFAULT	Fault Disconnection Driver	Drives external PMOS to isolate input during fault - active-high during normal operation, low during shutdown.
22 COMP	Loop Compensation	Connects RC network to GND to stabilize boost control loop - critical for transient response and stability.
23 VIN	Main Supply Input	4.5–25V input - powers internal LDO and boost switch; requires local ceramic bypass (≥4.7µF).
24 VCC	Internal 5V Regulator Output	Supplies gate drivers and logic; self-generated when VIN > 5.5V; otherwise requires external 5V supply.

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for −40°C to +125°C operation with extended reliability testing - suitable for automotive instrument clusters and center displays.
6-channel current matching	≤3% variation between strings - eliminates visible brightness gradients in multi-zone LCD backlights without software compensation.
Low 600mV current-sense voltage	Reduces power loss in current sinks by >40% vs. 1V+ references - increases system efficiency and eases thermal design.
Dual dimming architecture	Supports both PWM (external/internal) and analog DC dimming on same pins - enables noise-free brightness control across ambient light ranges.
Comprehensive fault protection	Integrated open-string (175mV threshold), short-string (5.5V threshold), OVP, UVLO, and thermal shutdown - prevents damage during LED failure or wiring faults.
Configurable boost frequency	1.25MHz or 625kHz selection via single pin - allows trade-off between compact magnetics (high-freq) and higher efficiency (low-freq).

Applications

Automotive Instrument Cluster Backlight

Center Infotainment Display

Use Scenario: Driving 6 parallel LED strings behind TFT LCD in vehicle dashboard, operating continuously across temperature extremes and vibration.

IC Role / Device Role / Timing Role: Primary LED current regulator and boost controller - manages string current balance, dimming response, and fault isolation in real time.

Use Value: Ensures consistent panel brightness and color fidelity despite battery voltage fluctuations and ambient temperature shifts, meeting OEM visual quality standards.

Use Scenario: Backlighting a 10.1-inch automotive infotainment screen with dynamic local dimming zones controlled via MCU PWM signals.

IC Role / Device Role / Timing Role: High-accuracy current source array with programmable DPWM timing - synchronizes dimming transitions with display frame updates.

Use Value: Enables flicker-free, silent brightness adjustment across 0–100% range while maintaining <3% inter-string current deviation for uniform image rendering.

Commercial Vehicle Head-Up Display (HUD)

Industrial HMI Panel Lighting

Use Scenario: Powering high-brightness WLED arrays in HUD projection optics, where thermal management and long-term stability are critical.

IC Role / Device Role / Timing Role: Boost converter + current sink subsystem - delivers regulated 50V/20mA per string with minimal thermal rise and no audible noise.

Use Value: Supports continuous operation at elevated junction temperatures (up to 125°C) while maintaining luminance stability and avoiding PWM-induced acoustic artifacts.

Use Scenario: Backlighting ruggedized industrial HMIs deployed in factory environments with wide input voltage and ESD exposure.

IC Role / Device Role / Timing Role: Fault-tolerant LED driver with open/short LED detection and AEC-Q100 reliability - ensures uninterrupted display operation during field faults.

Use Value: Reduces maintenance downtime by auto-isolating failed LED strings and continuing operation on remaining channels, verified per ISO 16750-2.

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-string LED driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPQ3386GQ-AEC1-P	Same die, QFN-24 package but with wettable flank leads - improves solder joint inspection and reliability in automated optical inspection (AOI) lines.	Preferred for high-volume automotive SMT production requiring IPC-A-610 Class 3 compliance and X-ray verification.	Select when board-level traceability and post-reflow inspection capability are required; identical electrical performance and pinout.
LM3409QMY/NOPB	Single-channel buck-boost LED controller - lacks integrated current sinks, requires external MOSFETs and sense resistors per string.	Suitable for custom topologies with variable string count or non-standard LED configurations; not drop-in compatible.	Choose only if system requires >6 strings, mixed-color LEDs, or independent per-string dimming - adds design complexity and BOM cost.

Compared with MPQ3386GQ-AEC1-P, the MPQ3386DR-AEC1-LF-Z offers identical functionality in standard QFN packaging optimized for cost-sensitive Tier 2 automotive modules, while LM3409QMY/NOPB demands external components and layout effort to achieve comparable multi-string regulation - making MPQ3386DR-AEC1-LF-Z the preferred choice for rapid, validated backlight integration.

Availability

MPQ3386DR-AEC1-LF-Z is available at Aetrix Electronics and suitable for automotive instrument clusters, center-stack infotainment displays, and commercial vehicle HUD systems requiring stable component supply, AEC-Q100 compliance, and long-term manufacturing continuity.

Supply support for MPQ3386DR-AEC1-LF-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 MPQ3386 belongs to MPS's automotive-grade LED driver product line, engineered specifically for robust, low-noise backlighting in safety-critical vehicle displays - emphasizing thermal resilience, fault tolerance, and seamless dimming integration.

FAQ

What is the maximum number of LEDs per string supported by MPQ3386DR-AEC1-LF-Z?

The device supports up to 10 white LEDs per string when operated at 50V maximum output and typical forward voltage of 3.2V per LED. This is confirmed by the design example in the datasheet (10 LEDs × 6 strings) and absolute maximum rating of V_LEDX = 50V. Exceeding 10 LEDs risks violating the 50V limit or triggering OVP during startup transients.

How does the MPQ3386DR-AEC1-LF-Z handle open LED string faults?

It detects open strings by monitoring LEDX pin voltage: if voltage drops below 175mV, the string is marked off after OVP threshold violation. The IC then regulates output using only remaining functional strings, maintaining backlight operation with reduced brightness. All marked-off strings remain disabled until full power cycle reset.

Can MPQ3386DR-AEC1-LF-Z operate with input voltage below 5.5V?

Yes - when VIN < 5.5V, the internal VCC LDO cannot regulate, so VCC must be externally supplied with a stable 5V source. This is explicitly required per the datasheet's "Operation" section and pin description for VCC, ensuring gate driver and control logic remain powered during low-battery conditions.

What is the minimum recommended PWM dimming frequency for noise-free operation?

The minimum recommended DPWM frequency is 1.2kHz (per f_DPWM = 3.5µF / C_FSET with C_FSET = 2.2nF). Operating ≥1kHz avoids audible noise in automotive cabins, as confirmed by the "APPLICATION INFORMATION" section specifying 100Hz–2kHz range and noting that frequencies above 1kHz eliminate mechanical resonance in display assemblies.

Is thermal derating required for continuous operation at 125°C ambient?

Yes - at T_A = 125°C, power dissipation must be limited to ≤0.7W based on θ_JA = 42°C/W and T_J(MAX) = 150°C. This is derived from PD_MAX = (T_J(MAX) − T_A) / θ_JA, and aligns with the "Recommended Operating Conditions" table limiting junction temperature to 125°C for continuous operation under worst-case PCB layout.

Does MPQ3386DR-AEC1-LF-Z support independent dimming of individual LED strings?

No - all six strings share a single dimming control path. The DPWM signal modulates current simultaneously across all active strings, as stated in the "Dimming Control" section: "PWM chopping of the current in the LEDs for all 6 channels." Independent per-string dimming would require discrete channel controllers or external PWM gating, which this IC does not provide.

What is the purpose of the VFAULT pin and how is it used in system design?

VFAULT drives an external PMOS to disconnect input from output during fault conditions (OVP, thermal shutdown, UVLO). During normal operation, it is actively pulled high to enable the PMOS; during faults, it goes low to disable the PMOS and isolate the power path - a critical safety feature for automotive systems requiring fail-safe power disconnection per ISO 26262 ASIL-B requirements.

MPQ3386DR-AEC1-LF-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 24-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: DC DC Regulator

Topology:: Step-Up (Boost)

Internal Switch(s):: No

Number of Outputs:: 6

Voltage - Supply (Min):: 4.5V

Voltage - Supply (Max):: 25V

Voltage - Output:: 50V

Current - Output / Channel:: -

Frequency:: 1.25MHz

Dimming:: PWM

Applications:: Backlight

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

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 24-QFN (4x4)

MPQ3386DR-AEC1-LF-Z FAQ

1.How can I place an order for MPQ3386DR-AEC1-LF-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MPQ3386DR-AEC1-LF-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 MPQ3386DR-AEC1-LF-Z reliable?

The price and inventory of MPQ3386DR-AEC1-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ3386DR-AEC1-LF-Z is usually 5 days.

3.What payment methods are accepted for MPQ3386DR-AEC1-LF-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ3386DR-AEC1-LF-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MPQ3386DR-AEC1-LF-Z?

MPQ3386DR-AEC1-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MPQ3386DR-AEC1-LF-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 MPQ3386DR-AEC1-LF-Z?

For technical support, including MPQ3386DR-AEC1-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ3386DR-AEC1-LF-Z requirements.

6.How does Aetrix verify that MPQ3386DR-AEC1-LF-Z is sourced from the original manufacturer or authorized distributors?

All MPQ3386DR-AEC1-LF-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 MPQ3386DR-AEC1-LF-Z meets industry standards.

7.What is the process for return or replacement of MPQ3386DR-AEC1-LF-Z?

All MPQ3386DR-AEC1-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ3386DR-AEC1-LF-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 MPQ3386DR-AEC1-LF-Z part is unused and in its original packaging.

Return procedure for MPQ3386DR-AEC1-LF-Z:

1.Submit a request within 90 days.

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

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