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Monolithic Power Systems Inc. MPQ3387LGRT-AEC1-P
- Part No.:
- MPQ3387LGRT-AEC1-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
MPQ3387LGRT-AEC1-P.pdf
- Description:
- IC LED DRV RGLTR PWM 45MA 24TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,170
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Product details
Overview
MPQ3387LGRT-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified step-up white LED driver with six independent current-regulated channels, 3% inter-string current matching accuracy, 45V max output voltage, and combined analog/PWM dimming with 25% transfer point-designed for automotive LCD backlighting requiring stable high-brightness control under wide input (3V–25V) and temperature (−40°C to +125°C) ranges.
For engineers reviewing the MPQ3387LGRT-AEC1-P datasheet, MPQ3387LGRT-AEC1-P pinout, MPQ3387LGRT-AEC1-P application, or MPQ3387LGRT-AEC1-P equivalent, this device delivers verified 24kHz–27.5kHz audible-noise-free dimming frequency, recoverable OCP/OVP/OTP protection, cascading capability, and TQFN-24 (4mm×4mm) package compatibility for space-constrained automotive display systems.
Technical Context
The MPQ3387LGRT-AEC1-P implements peak-current-mode PWM control with programmable switching frequency (532–1.5 MHz via external resistor on FREQ pin) and integrates six open-drain LED string drivers with 500mV low dropout regulation voltage to minimize power loss. Its internal 5V LDO (VCC) powers gate drivers and control circuitry when VIN > 5.5V.
Dimming logic is determined by the MIX pin: high enables combined analog/PWM mode with automatic 25% duty-cycle transfer and input-frequency upconversion (100Hz–20kHz → 24kHz–27.5kHz); low enables direct PWM mode. Protection includes recoverable over-current, over-voltage (programmable via OVP pin), over-temperature (150°C shutdown, 20°C hysteresis), and per-string open/short detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 25V - supports wide automotive battery range including cold-crank and load-dump conditions. |
| Max Output Voltage | 45V - sufficient to drive 10+ white LEDs in series per string at typical forward voltage (3.0–3.5V). |
| LED Current per String | Up to 45mA - configurable via ISET resistor; 20mA typical with 60.4kΩ yields ±0.6mA tolerance. |
| Current Matching Accuracy | ±3% between strings - ensures uniform brightness across multi-string LCD backlights without external calibration. |
| Dimming Frequency Range | 24kHz to 27.5kHz - eliminates audible noise during low-duty-cycle dimming in automotive cabins. |
| Switching Frequency Range | 532kHz to 1.5MHz - enables optimization of inductor size, efficiency, and EMI performance. |
| OVP Threshold | Programmable 1.16V–1.24V at OVP pin - sets output overvoltage limit to protect LEDs and downstream components. |
| Operating Junction Temp | −40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood and dashboard applications. |
Pinout & Package
TQFN-24 (4mm × 4mm) package with exposed thermal pad connected to PGND; RoHS-compliant, lead-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable Control Input | Active-high logic input; internally weakly pulled low - enables soft-start sequence only after VIN and PWMI are stable. |
| FREQ | Switching Frequency Setting | Connects external resistor to GND to set oscillator frequency; determines inductor size and EMI profile. |
| MIX | Dimming Mode Select | Pulled high = combined analog/PWM mode (25% transfer); pulled low = direct PWM mode - configures dimming architecture. |
| PWMI | PWM Dimming Signal Input | Accepts 100Hz–20kHz PWM signal; IC auto-upconverts to 24kHz–27.5kHz to suppress audible noise. |
| ISET | LED Current Programming | 1.241V reference node - ties to GND via resistor to set identical current across all 6 strings (e.g., 60.4kΩ = 20mA). |
| LED1–LED6 | LED String Cathode Outputs | Open-drain current sinks - each regulates individual string current; support per-string fault detection. |
| OVP | Over-Voltage Protection Input | Monitors output via resistor divider; triggers shutdown if voltage exceeds programmed threshold (1.16–1.24V). |
| LX1/LX2 | Power Switch Outputs | Drains of internal N-MOSFETs - must be shorted externally; connects to boost inductor and rectifier diode. |
| VIN | Main Power Input | Supplies entire IC; bypassed locally with ≥4.7μF ceramic capacitor to handle high di/dt transients. |
| VCC | Internal 5V LDO Output | Powers gate drivers and control logic; tied to VIN if input < 5.5V; UVLO hysteresis = 200mV. |
Key Features
| Feature | Design Value |
|---|---|
| 6-channel independent current regulation | Each LED string driven by dedicated current sink with 500mV compliance voltage - reduces conduction loss and thermal stress. |
| Combined analog/PWM dimming with 25% transfer | Enables seamless transition: analog dimming above 25% duty (reducing power loss), PWM below 25% (preserving dimming ratio) - improves dynamic range. |
| Auto-frequency upconversion (100Hz–20kHz → 24kHz–27.5kHz) | Eliminates audible coil whine in automotive environments without requiring external clock synthesis or filtering. |
| Cascading capability | Multiple MPQ3387L devices can share one power source and synchronize dimming - scales backlighting for large displays without added controllers. |
| Recoverable fault protection suite | OCP, OVP, OTP, open-string, and short-string detection all auto-recover after fault removal - ensures robust operation in unattended systems. |
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C operation with full reliability testing - certified for safety-critical automotive display applications. |
Applications
| Automotive Instrument Cluster Backlight | Center Stack Infotainment Display |
|---|---|
|
Use Scenario: High-reliability backlight for TFT-LCD gauges in vehicles operating across extreme ambient temperatures and vibration profiles. IC Role / Device Role / Timing Role: Step-up LED driver providing six independently regulated current outputs to drive segmented LED arrays behind analog dials and digital readouts. Use Value: ±3% inter-string current matching ensures consistent luminance across gauge zones; AEC-Q100 Grade 1 rating guarantees functional safety under automotive thermal and EMC stress. |
Use Scenario: Brightness-controlled backlight for 7–10 inch infotainment touchscreens in passenger compartments. IC Role / Device Role / Timing Role: White LED driver managing six parallel LED strings with synchronized dimming and fault reporting to MCU via optional FF pin. Use Value: 24kHz–27.5kHz dimming frequency prevents audible noise during low-brightness navigation use; cascading support enables dual-display configurations from single power rail. |
| Head-Up Display (HUD) Projection Module | Automotive Rear Seat Entertainment (RSE) Panel |
|
Use Scenario: Compact, high-efficiency backlight for HUD combiner optics requiring precise luminance uniformity and minimal EMI. IC Role / Device Role / Timing Role: Boost converter + current regulator delivering stable 45V output to drive high-Vf LED arrays while maintaining tight current regulation. Use Value: 500mV LED current sink dropout minimizes power dissipation in thermally constrained HUD enclosures; TQFN-24 package enables dense PCB layout. |
Use Scenario: Dual-zone backlight for fold-down RSE tablets used in SUVs and minivans, subject to intermittent power and mechanical shock. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with per-string open/short detection and auto-recovery - maintains partial backlight functionality during single-string failure. Use Value: Recoverable OVP/OCP/OTP allows continued operation after transient overloads; 3V–25V input range accommodates 12V/24V vehicle architectures and battery backup modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ3387GRT-AEC1-Z | Same die, non-automotive grade (no AEC-Q100 qualification); identical electrical specs and pinout. | Restricted to industrial or consumer displays where automotive reliability certification is not required. | Select only if AEC-Q100 compliance is unnecessary and cost sensitivity outweighs qualification assurance. |
| LM3409QMYX/NOPB | Single-channel buck-boost LED controller; requires external MOSFETs, no integrated current sinks or analog dimming. | Suitable for custom high-power designs but lacks multi-string integration, dimming flexibility, and automotive qualification. | Choose only when system-level design demands discrete power stage control and higher output current (>45mA/string) is needed. |
Compared with MPQ3387LGRT-AEC1-P, the MPQ3387GRT-AEC1-Z omits automotive qualification but retains full functional equivalence, while the LM3409QMYX/NOPB trades integration and dimming sophistication for design flexibility and higher per-channel current capability - making the MPQ3387LGRT-AEC1-P optimal for production-ready AEC-Q100-compliant multi-string backlighting.
Availability
MPQ3387LGRT-AEC1-P is available at Aetrix Electronics and suitable for automotive instrument clusters, center-stack infotainment displays, and head-up display modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-certified traceability.
Supply support for MPQ3387LGRT-AEC1-P 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, motor drivers, and battery management solutions.
The MPQ3387L product line targets automotive-grade LCD backlighting, emphasizing AEC-Q100 qualification, multi-string current matching, and noise-immune dimming - engineered specifically for safety-critical display systems in modern vehicles.
FAQ
What is the purpose of the MIX pin on MPQ3387LGRT-AEC1-P?
The MIX pin selects dimming architecture: pulled high (default) enables combined analog/PWM dimming with 25% duty-cycle transfer point, improving dimming ratio and eliminating audible noise; pulled low enables direct PWM dimming mode for simplified control. It directly configures internal logic paths and cannot be left floating.
How does the MPQ3387LGRT-AEC1-P achieve 3% current matching between LED strings?
It uses six matched internal current sources with precision 1.241V ISET reference and low 500mV regulation voltage, minimizing process- and temperature-induced mismatches. Matching is measured as (Imax − Imin)/Iset and guaranteed across −40°C to +125°C per AEC-Q100 test conditions.
Can MPQ3387LGRT-AEC1-P drive more than six LED strings?
No - it has exactly six dedicated LED current sink outputs (LED1–LED6). However, multiple MPQ3387LGRT-AEC1-P devices can be cascaded using shared VIN and synchronized PWMI signals to scale to 12+ strings while maintaining independent current regulation per channel.
What is the function of the NC pin labeled "Optional for Fault Flag Pin"?
Pin 21 is normally no-connect but can be configured as an open-drain fault flag (FF) output: pulled low during OVP, OCP, OTP, or open/short-string faults; high-impedance during normal operation. Requires external pull-up resistor to monitor fault status with MCU GPIO.
Is the VCC pin always active when VIN is applied?
No - VCC is generated by an internal LDO that activates only when VIN exceeds the 2.55V UVLO threshold and remains enabled until VIN drops below 2.35V (200mV hysteresis). If VIN < 5.5V, VCC must be externally tied to VIN to ensure proper biasing of internal circuitry.
How is over-voltage protection (OVP) programmed on MPQ3387LGRT-AEC1-P?
OVP threshold is set via resistor divider from output bus to OVP pin, targeting 1.16V–1.24V at the pin. For example, with 45V output, use RHIGH/RLOW ≈ 36:1 to yield ~1.2V at OVP pin - triggering shutdown if output exceeds ~1.2× nominal voltage.
Does MPQ3387LGRT-AEC1-P support analog dimming only, without PWM?
No - analog dimming is only available in combined mode (MIX = high), where it operates above 25% PWM duty cycle. There is no standalone analog dimming input; brightness control always requires a PWM signal applied to PWMI, even in combined mode.
MPQ3387LGRT-AEC1-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- -
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 25V
- Voltage - Output:
- 45V
- Current - Output / Channel:
- 45mA
- Frequency:
- 24kHz ~ 27.5kHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TQFN (4x4)
MPQ3387LGRT-AEC1-P FAQ
1.How can I place an order for MPQ3387LGRT-AEC1-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ3387LGRT-AEC1-P 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 MPQ3387LGRT-AEC1-P reliable?
The price and inventory of MPQ3387LGRT-AEC1-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ3387LGRT-AEC1-P is usually 5 days.
3.What payment methods are accepted for MPQ3387LGRT-AEC1-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ3387LGRT-AEC1-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ3387LGRT-AEC1-P?
MPQ3387LGRT-AEC1-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ3387LGRT-AEC1-P 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 MPQ3387LGRT-AEC1-P?
For technical support, including MPQ3387LGRT-AEC1-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ3387LGRT-AEC1-P requirements.
6.How does Aetrix verify that MPQ3387LGRT-AEC1-P is sourced from the original manufacturer or authorized distributors?
All MPQ3387LGRT-AEC1-P 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 MPQ3387LGRT-AEC1-P meets industry standards.
7.What is the process for return or replacement of MPQ3387LGRT-AEC1-P?
All MPQ3387LGRT-AEC1-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ3387LGRT-AEC1-P, 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 MPQ3387LGRT-AEC1-P part is unused and in its original packaging.
Return procedure for MPQ3387LGRT-AEC1-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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