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Monolithic Power Systems Inc. MPQ4425BGJ-AEC1-P
- Part No.:
- MPQ4425BGJ-AEC1-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MPQ4425BGJ-AEC1-P.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
MPQ4425BGJ-AEC1-P from Monolithic Power Systems is a synchronous step-down LED driver IC designed for automotive white LED lighting. It delivers 1.5A continuous output current, operates from 4V–36V input, integrates 85mΩ/50mΩ MOSFETs, features 400kHz fixed-frequency PWM control, and supports PWM dimming down to 100Hz. It is AEC-Q100 Grade 1 qualified and housed in TSOT23-8.
For engineers reviewing the MPQ4425BGJ-AEC1-P datasheet, MPQ4425BGJ-AEC1-P pinout, MPQ4425BGJ-AEC1-P application, or MPQ4425BGJ-AEC1-P equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade reliability data, CISPR25 Class 5 EMI compliance metrics, and real-world fault-handling behavior for LED short/open/thermal events.
Technical Context
The MPQ4425BGJ-AEC1-P uses peak-current-mode control with internal 0.2V reference and error amplifier driving COMP voltage to regulate LED current via valley-current detection. Its forced CCM operation ensures stable 400kHz switching across full load range, minimizing output ripple and enabling predictable EMI filtering.
It integrates dual MOSFETs (85mΩ HS / 50mΩ LS), bootstrap gate drive with 2.2V UVLO, and open-drain /FAULT reporting for LED short, open, and thermal shutdown. The internal 4.9V VCC regulator powers all circuitry across the full 4V–36V input range, with soft-start time of 0.9ms at 1.5A load.
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 white LED arrays in headlamps or DRLs. |
| Switching Frequency | 400kHz (±100kHz) - enables compact magnetics and meets CISPR25 Class 5 conducted/radiated EMI limits. |
| Internal MOSFET RDS(ON) | 85mΩ (HS) / 50mΩ (LS) - reduces conduction loss and thermal stress in TSOT23-8 package. |
| Feedback Reference | 0.2V ±4% - low-voltage sensing minimizes I²R loss in external sense resistor, improving efficiency at high current. |
| Fault Reporting | Open-drain /FAULT with 4mA sink capability - directly interfaces with microcontroller GPIO for system-level fault logging. |
| AEC-Q100 Grade | Grade 1 (−40°C to +125°C TJ) - qualified for under-hood automotive LED lighting applications. |
Pinout & Package
MPQ4425BGJ-AEC1-P is packaged in TSOT23-8 - a thermally enhanced, surface-mount, 8-pin leaded package (2.9mm × 1.6mm × 1.1mm) optimized for space-constrained automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Power input | 4V–36V supply rail; requires wide PCB trace and local 10μF+ ceramic decoupling. |
| 2 (/FAULT) | Fault indicator | Open-drain output pulled low during LED short/open or thermal shutdown; requires external pull-up to VCC. |
| 3 (EN/DIM) | Enable & PWM dimming input | Logic-high enables device; 100Hz–2kHz external PWM applied here controls LED brightness proportionally. |
| 4 (FB) | Current-sense feedback | Connects to low-side sense resistor; regulates LED current by comparing voltage to 0.2V internal reference. |
| 5 (PGND) | Power ground | High-current return path for switch node; must be connected via copper pour and multiple vias to minimize noise. |
| 6 (SW) | Switch node | Drives external inductor; connects to BST capacitor and requires low-inductance layout to suppress ringing. |
| 7 (BST) | Bootstrap supply | Forms floating gate drive for HS-FET; requires 0.1μF ceramic cap between BST and SW, plus 20Ω series resistor. |
| 8 (VCC) | Bias supply | Internally regulated 4.9V output; decoupled with 0.1–0.22μF ceramic cap; not externally powered. |
Key Features
| Feature | Design Value |
|---|---|
| Forced Continuous Conduction Mode (CCM) | Maintains fixed 400kHz frequency from no-load to full 1.5A, reducing light-output flicker and simplifying EMI filter design. |
| CISPR25 Class 5 Compliance | Validated for conducted/radiated emissions (150kHz–1GHz) on standard 4-layer EVB - eliminates need for external EMI filters in most designs. |
| Integrated Fault Protection | Detects and reports LED short-to-GND, LED open, and thermal shutdown via dedicated /FAULT pin with <10μs response latency. |
| Valley-Current Detection OCP | Prevents runaway inductor current during overload by disabling HS-FET until valley current falls below threshold - improves robustness vs. peak-only limiting. |
| Internal Soft Start | 0.9ms controlled ramp of COMP voltage limits inrush current and prevents LED current overshoot during power-up. |
Applications
| Automotive Headlamp Low Beam | Automotive Daytime Running Light (DRL) |
|---|---|
Use Scenario: Constant-current drive for 4–6 series white LEDs in adaptive front-lighting systems (AFS). IC Role / Device Role / Timing Role: Primary LED current regulator with PWM dimming interface for dynamic beam shaping. Use Value: Delivers stable 1.5A output across 8V–16V battery variations and −40°C to +125°C junction temperature, meeting ASIL-B functional safety requirements via fault reporting. |
Use Scenario: High-brightness, always-on LED array in vehicle front fascia. IC Role / Device Role / Timing Role: Fixed-frequency synchronous buck controller with integrated MOSFETs and thermal monitoring. Use Value: Achieves >94% efficiency at 12V input/6.4V LED string, reducing thermal load in sealed housing while maintaining CISPR25 Class 5 compliance. |
| Automotive Fog Lamp | Automotive Interior Ambient Lighting |
Use Scenario: Robust LED driver for off-road or adverse-weather illumination modules exposed to vibration and thermal cycling. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 current source with fault indication for system diagnostics. Use Value: Withstands 36V load-dump transients and maintains regulation during engine cranking (4.5V min), eliminating need for external TVS or LDO pre-regulation. |
Use Scenario: Dimmable multi-zone RGBW ambient lighting in cabin, center console, and footwell. IC Role / Device Role / Timing Role: PWM-dimmable constant-current channel driver interfaced to MCU via EN/DIM pin. Use Value: Supports smooth 100Hz–2kHz PWM dimming with <2ms startup delay, enabling flicker-free human-centric lighting without external dimming ICs. |
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 |
|---|---|---|---|
| MPQ4425BGQB-AEC1 | Same die, QFN-13 (2.5mm×3mm) package with wettable flanks; 42°C/W θJA vs. TSOT23-8's 45°C/W. | Better thermal performance and solder-joint inspection capability; requires different PCB footprint and stencil. | Select when higher power dissipation (>1.2W) or automated optical inspection (AOI) is required. |
| LM3409QMY/NOPB | Adjustable 1.25V reference, external MOSFETs, 1MHz max frequency; no integrated fault reporting pin. | Lacks /FAULT output and AEC-Q100 qualification; requires additional components for thermal/short protection. | Select only for non-automotive cost-sensitive designs where board space and qualification are secondary. |
Compared with MPQ4425BGQB-AEC1, the MPQ4425BGJ-AEC1-P offers identical electrical performance in a smaller, lower-cost TSOT23-8 package with adequate thermal margin for ≤1.2W dissipation; compared with LM3409QMY/NOPB, it delivers plug-and-play AEC-Q100 compliance, integrated protection, and reduced BOM count at the expense of adjustable frequency and external FET flexibility.
Availability
MPQ4425BGJ-AEC1-P is available at Aetrix Electronics and suitable for automotive headlamp systems, daytime running lights, fog lamps, and interior ambient lighting requiring stable component supply, AEC-Q100 qualification, and CISPR25 Class 5 EMI compliance.
Supply support for MPQ4425BGJ-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 over two decades of expertise in DC/DC conversion, LED drivers, and motor control solutions.
The MPQ4425B product line targets automotive LED lighting applications requiring high efficiency, small form factor, and rigorous reliability validation - delivering integrated, AEC-Q100-qualified solutions that reduce system complexity and accelerate time-to-market.
FAQ
What is the minimum PWM dimming frequency supported by MPQ4425BGJ-AEC1-P?
The MPQ4425BGJ-AEC1-P supports PWM dimming from 100Hz to 2kHz on the EN/DIM pin. At 100Hz, the device maintains stable current regulation with <1% LED current ripple. Below 100Hz, duty-cycle accuracy degrades due to internal timing constraints, and flicker may become perceptible in static lighting applications.
How does the /FAULT pin behave during LED open-circuit condition?
During LED open-circuit, the /FAULT pin pulls low within 10μs after detection, remaining latched low until either VIN drops below UVLO threshold or EN/DIM is cycled. The pin is open-drain and requires an external 10kΩ–100kΩ pull-up to VCC or another logic rail to generate a valid logic-low signal for MCU interrupt handling.
Can MPQ4425BGJ-AEC1-P operate without an external bootstrap capacitor?
No. The BST pin requires a 0.1μF ceramic capacitor connected between BST and SW to enable high-side MOSFET gate drive. Omitting this capacitor prevents HS-FET turn-on, causing immediate /FAULT assertion and zero output current. A 20Ω resistor in series with the BST capacitor is strongly recommended to dampen SW node ringing.
What is the thermal shutdown hysteresis and how does it affect system recovery?
Thermal shutdown activates at 170°C junction temperature and recovers when die temperature falls to ~140°C, yielding 30°C hysteresis. This prevents thermal oscillation during sustained high-power operation. Recovery is automatic and does not require cycling EN or VIN - the device resumes regulation once temperature drops below the hysteresis threshold.
Is the FB pin internally clamped, and what is its absolute maximum voltage rating?
Yes, the FB pin has internal ESD protection diodes clamping to AGND and VCC rails. Its absolute maximum voltage is −0.3V to +6V per datasheet Absolute Maximum Ratings. Exceeding +6V risks permanent damage; external overvoltage protection (e.g., Zener clamp) is recommended if FB traces run near noisy nodes or long cables.
Does MPQ4425BGJ-AEC1-P support analog dimming via the FB pin?
No. The FB pin is strictly a current-sense feedback input referenced to 0.2V; it is not designed for analog dimming. Dimming is implemented exclusively via PWM on the EN/DIM pin. Applying variable DC voltage to FB will disrupt regulation and may trigger OCP or cause unstable output current.
What is the recommended PCB layout practice for PGND and AGND connections?
PGND and AGND are internally connected inside the IC, so external connection is optional but recommended. Place a single 0.1mm-wide bridge trace between PGND and AGND pads near the IC, avoiding shared return paths with digital or analog signals. Route PGND with wide copper pours and ≥4 thermal vias to inner ground planes to minimize impedance and EMI coupling.
MPQ4425BGJ-AEC1-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- 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:
- 0.2V ~ 36V
- Current - Output / Channel:
- 1.5A
- Frequency:
- 400kHz
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
MPQ4425BGJ-AEC1-P FAQ
1.How can I place an order for MPQ4425BGJ-AEC1-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4425BGJ-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 MPQ4425BGJ-AEC1-P reliable?
The price and inventory of MPQ4425BGJ-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 MPQ4425BGJ-AEC1-P is usually 5 days.
3.What payment methods are accepted for MPQ4425BGJ-AEC1-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4425BGJ-AEC1-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4425BGJ-AEC1-P?
MPQ4425BGJ-AEC1-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4425BGJ-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 MPQ4425BGJ-AEC1-P?
For technical support, including MPQ4425BGJ-AEC1-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4425BGJ-AEC1-P requirements.
6.How does Aetrix verify that MPQ4425BGJ-AEC1-P is sourced from the original manufacturer or authorized distributors?
All MPQ4425BGJ-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 MPQ4425BGJ-AEC1-P meets industry standards.
7.What is the process for return or replacement of MPQ4425BGJ-AEC1-P?
All MPQ4425BGJ-AEC1-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4425BGJ-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 MPQ4425BGJ-AEC1-P part is unused and in its original packaging.
Return procedure for MPQ4425BGJ-AEC1-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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