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Monolithic Power Systems Inc. MPQ4425AGQB-AEC1-P
- Part No.:
- MPQ4425AGQB-AEC1-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 13-PowerVQFN
- Datasheet:
-
MPQ4425AGQB-AEC1-P.pdf
- Description:
- IC LED DRVR RGLTR PWM 1.5A 13QFN
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
MPQ4425AGQB-AEC1-P from Monolithic Power Systems is a synchronous step-down LED driver IC with integrated 85mΩ/50mΩ MOSFETs, delivering up to 1.5A continuous output current across a 4V–36V input range, operating at a fixed 2.2MHz switching frequency, and qualified to AEC-Q100 Grade-1 for automotive lighting applications.
For engineers reviewing the MPQ4425AGQB-AEC1-P datasheet, MPQ4425AGQB-AEC1-P pinout, MPQ4425AGQB-AEC1-P application, or MPQ4425AGQB-AEC1-P equivalent, this page provides verified technical context, validated pin functions, confirmed AEC-Q100 compliance, PWM dimming support (100Hz–2kHz), fault indication logic, and real-world thermal shutdown thresholds (170°C trip, 140°C recovery).
Technical Context
The MPQ4425AGQB-AEC1-P uses peak-current-mode control with internal 0.2V reference and valley-current detection for over-current protection. It operates in forced continuous conduction mode (CCM) across full load range and implements frequency foldback (to 1.1MHz) above ~21V input or during fault conditions.
Its integrated bootstrap regulator supports high-side gate drive with 2.2V UVLO and 150mV hysteresis; the /FAULT pin provides open-drain fault signaling for LED short/open and thermal shutdown events, while EN/DIM serves dual-purpose enable and PWM dimming control with 1.45V rising threshold and 450mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports wide automotive battery rail variations including cold-crank (4.5V) and load-dump (36V) transients. |
| Max Output Current | 1.5A continuous - sufficient for multi-string white LED arrays in headlamp and DRL modules. |
| Switching Frequency | 2.2MHz nominal (1.8–2.6MHz) - enables compact external magnetics and reduces EMI below AM band. |
| Internal MOSFET RDS(on) | 85mΩ (HS) / 50mΩ (LS) - minimizes conduction loss and thermal rise at 1.5A output. |
| Feedback Reference | 0.2V ±4% - sets LED current via single external resistor (e.g., 133mΩ for 1.5A), simplifying precision current regulation. |
| Thermal Shutdown | 170°C trip / 140°C hysteresis - protects die under sustained overload while allowing safe restart after cooling. |
| PWM Dimming Range | 100Hz to 2kHz - compatible with standard automotive microcontroller PWM outputs without external signal conditioning. |
Pinout & Package
MPQ4425AGQB-AEC1-P is housed in a wettable-flank QFN-13 package (2.5mm × 3mm, 0.5mm pitch), optimized for automated optical inspection (AOI) and robust solder joint reliability in automotive PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 IN | Power input | Accepts 4V–36V supply; requires low-ESR ceramic input capacitor placed adjacent to minimize high-frequency loop area. |
| 3 NC | No connect | Internally unconnected; must remain floating - no external tie or trace. |
| 4 /FAULT | Fault indicator | Open-drain output pulled low on LED short/open or thermal shutdown; requires external pull-up to VCC or bias rail. |
| 5 EN/DIM | Enable & dimming control | Logic-high (>1.45V) enables operation; 100Hz–2kHz PWM applied here controls LED brightness proportionally. |
| 6 FB | Current sense feedback | Monitors voltage across external RFB; regulates LED current to maintain 0.2V at this pin. |
| 7 VCC | Bias supply | Internal 4.9V regulator output; decoupled with 0.1–0.22μF ceramic capacitor directly at pin. |
| 8 AGND | Analog ground | Reference for error amplifier and logic; 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 careful layout separation from analog signals. |
| 10 BST | Bootstrap supply | Connects to SW via 0.1–1μF capacitor and 20Ω series resistor to power high-side gate driver. |
| 11–13 PGND | Power ground | High-current return path for MOSFETs and inductor; requires solid copper pour with multiple vias to inner ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade-1 qualification | Rated for -40°C to +125°C ambient operation - validated for engine bay and exterior lighting environments. |
| CISPR25 Class 5 compliance | Meets stringent automotive EMI limits without external filters in typical layouts - reduces BOM cost and board space. |
| Forced CCM operation | Maintains fixed 2.2MHz frequency from no-load to full 1.5A - eliminates audible noise and ensures predictable EMI profile. |
| Integrated fault diagnostics | /FAULT pin reports LED open, short, and thermal events individually - enables system-level fault logging and fail-safe response. |
| Valley-current OCP | Detects inductor current collapse during overload - prevents runaway current in short-circuit or dimming-off conditions. |
Applications
| Automotive Headlamps | Daytime Running Lights (DRL) |
|---|---|
Use Scenario: High-brightness forward lighting in OEM headlamp modules with adaptive beam control. IC Role / Device Role / Timing Role: Primary constant-current LED driver regulating 1.5A across 2–4 series white LEDs with PWM dimming synchronized to vehicle CAN bus commands. Use Value: Delivers stable luminance across 8V–16V battery range and survives 36V load-dump transients without derating or external clamping. | Use Scenario: Energy-efficient, always-on front lighting meeting EU ECE R87 photometric requirements. IC Role / Device Role / Timing Role: Single-chip LED current controller enabling 100Hz–2kHz brightness modulation for dynamic signature lighting effects. Use Value: Achieves >92% efficiency at 12V input/36V LED string, minimizing thermal load in sealed lamp housings. |
| Automotive Fog Lamps | Interior Ambient Lighting |
Use Scenario: Compact, thermally robust fog lamp assemblies mounted in bumper cavities with limited airflow. IC Role / Device Role / Timing Role: Synchronous buck driver providing 1.5A output with built-in thermal shutdown (170°C) and fault reporting via /FAULT pin. Use Value: Eliminates need for external current-sense amplifier or discrete protection circuitry - reduces component count by ≥4 parts. | Use Scenario: RGBW or tunable-white cabin lighting with smooth dimming and color consistency. IC Role / Device Role / Timing Role: High-frequency (2.2MHz) current source enabling flicker-free dimming without interference with camera-based driver monitoring systems. Use Value: Supports PWM dimming down to 1% duty cycle with <1% current variation - preserves color point accuracy across brightness levels. |
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 |
|---|---|---|---|
| MPQ4425AGQBE-AEC1 | Wettable flank QFN-13 variant with identical electrical specs and AEC-Q100 Grade-1 rating. | Same functional use; selected when AOI-compatible solder joints are required for high-reliability automotive manufacturing. | Choose for automated optical inspection compatibility - same thermal and electrical performance, enhanced process yield verification. |
| LM3409QMYX/NOPB | External MOSFET controller (no integrated FETs); 1.25MHz max switching frequency; requires separate HS/LS FETs and gate drivers. | Suitable for higher-current or higher-voltage LED strings (>36V), but increases BOM count and layout complexity. | Prefer only when >1.5A output or >36V input is required - adds design overhead but offers greater flexibility in power stage optimization. |
Compared with MPQ4425AGQB-AEC1-P, the wettable-flank MPQ4425AGQBE-AEC1 offers identical performance with improved manufacturability, while LM3409QMYX/NOPB trades integration for scalability - making the MPQ4425AGQB-AEC1-P optimal for cost-sensitive, space-constrained 1.5A automotive LED applications where AEC-Q100 compliance and minimal external components are critical.
Availability
MPQ4425AGQB-AEC1-P is available at Aetrix Electronics and suitable for automotive headlamps, daytime running lights, and fog lamps requiring stable component supply with AEC-Q100 Grade-1 assurance and long-term production continuity.
Supply support for MPQ4425AGQB-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 power management ICs, with design centers in the US, China, and Taiwan, and global distribution through authorized partners.
The MPQ4425A product line delivers highly integrated, AEC-Q100-qualified LED drivers targeting automotive exterior lighting applications where small footprint, high efficiency, and robust fault handling are mandatory.
FAQ
What is the minimum input voltage required for MPQ4425AGQB-AEC1-P to start switching?
The device features an internal under-voltage lockout (UVLO) with a rising threshold of 3.5V. It begins switching only when the input voltage exceeds this value, ensuring stable operation before enabling the power stage. The falling threshold is 3.1V, providing 400mV hysteresis to prevent oscillation near the turn-on point.
Can MPQ4425AGQB-AEC1-P drive more than two series-connected LEDs?
Yes - the 36V maximum input voltage allows driving up to eight 3.2V white LEDs in series (25.6V total forward voltage) while maintaining sufficient headroom for regulation. Output current remains precisely controlled at 1.5A regardless of LED count, provided the input-to-output voltage differential stays within thermal limits.
Is an external bootstrap diode required for reliable operation?
No - the MPQ4425AGQB-AEC1-P includes an internal bootstrap charging circuit that functions reliably across all duty cycles. An external diode (e.g., IN4148) is optional and recommended only when operating above 65% duty cycle to improve efficiency by reducing bootstrap capacitor discharge losses.
How does the /FAULT pin behave during thermal shutdown?
During thermal shutdown, the /FAULT pin is actively pulled low via an internal open-drain MOSFET. This state persists until the junction temperature falls below the hysteresis threshold (~140°C), at which point the pin releases and returns high via the external pull-up resistor - providing unambiguous, latched fault signaling.
What is the purpose of the 20Ω resistor between SW and BST pins?
This resistor dampens high-frequency ringing on the bootstrap node caused by SW node voltage spikes, reducing electromagnetic interference and preventing false triggering of the high-side driver UVLO. Its value balances spike suppression against bootstrap charging efficiency - values significantly higher degrade startup reliability.
Does MPQ4425AGQB-AEC1-P support analog dimming?
No - the device supports only PWM dimming via the EN/DIM pin. Analog dimming (voltage-controlled current adjustment) is not implemented; the feedback reference is fixed at 0.2V, and no DAC or variable reference interface is provided. Brightness control must be achieved using externally generated 100Hz–2kHz PWM signals.
What is the maximum allowable RMS current for the input capacitor?
The input capacitor must handle an RMS current exceeding half the maximum LED current (i.e., >0.75A for 1.5A output). This requirement arises from discontinuous input current draw; undersized capacitors cause excessive heating and premature failure, especially under high-duty-cycle conditions.
MPQ4425AGQB-AEC1-P 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)
MPQ4425AGQB-AEC1-P FAQ
1.How can I place an order for MPQ4425AGQB-AEC1-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4425AGQB-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 MPQ4425AGQB-AEC1-P reliable?
The price and inventory of MPQ4425AGQB-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 MPQ4425AGQB-AEC1-P is usually 5 days.
3.What payment methods are accepted for MPQ4425AGQB-AEC1-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4425AGQB-AEC1-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4425AGQB-AEC1-P?
MPQ4425AGQB-AEC1-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4425AGQB-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 MPQ4425AGQB-AEC1-P?
For technical support, including MPQ4425AGQB-AEC1-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4425AGQB-AEC1-P requirements.
6.How does Aetrix verify that MPQ4425AGQB-AEC1-P is sourced from the original manufacturer or authorized distributors?
All MPQ4425AGQB-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 MPQ4425AGQB-AEC1-P meets industry standards.
7.What is the process for return or replacement of MPQ4425AGQB-AEC1-P?
All MPQ4425AGQB-AEC1-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4425AGQB-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 MPQ4425AGQB-AEC1-P part is unused and in its original packaging.
Return procedure for MPQ4425AGQB-AEC1-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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