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Monolithic Power Systems Inc. MPQ4425BGJ-AEC1-Z
- Part No.:
- MPQ4425BGJ-AEC1-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
MPQ4425BGJ-AEC1-Z.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,492
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Product details
Overview
MPQ4425BGJ-AEC1-Z from Monolithic Power Systems is a synchronous step-down white LED driver IC with integrated 85mΩ/50mΩ MOSFETs, delivering up to 1.5A output current across 4V–36V input range, operating at fixed 400kHz switching frequency, and qualified to AEC-Q100 Grade 1 for automotive front/rear lighting systems.
For engineers reviewing the MPQ4425BGJ-AEC1-Z datasheet, MPQ4425BGJ-AEC1-Z pinout, MPQ4425BGJ-AEC1-Z application, or MPQ4425BGJ-AEC1-Z equivalent, this device supports PWM dimming (100Hz–2kHz), features fault indication (/FAULT open-drain), internal soft start, and CISPR25 Class 5 EMI compliance - critical for automotive LED headlamp and DRL designs requiring robust thermal and over-current protection.
Technical Context
The MPQ4425BGJ-AEC1-Z employs peak current-mode control with fixed 400kHz oscillator and forced continuous conduction mode (CCM), enabling stable regulation from no-load to full 1.5A output. Its valley-current detection OCP responds within 10μs during overload, while internal 0.2V reference and error amplifier simplify current-sense loop design using external RSENSE.
Bootstrap charging is managed via internal floating regulator with 2.2V UVLO and 150mV hysteresis; BST capacitor charging occurs only during low-side FET conduction when VIN–VSW is maximized. Thermal shutdown activates at 170°C with 30°C hysteresis, and /FAULT asserts low on LED open/short or TSD events.
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 | Up to 1.5A continuous - sufficient for multi-string white LED arrays in headlamps and fog lamps. |
| Switching frequency | 400kHz (±100kHz) - enables compact magnetics and EMI filtering while avoiding AM band interference. |
| Internal MOSFET RDS(on) | 85mΩ (HS) / 50mΩ (LS) - minimizes conduction loss and thermal rise at 1.5A, supporting >94% peak efficiency. |
| Feedback reference | 0.2V ±4% - allows precise current regulation with low-value, high-accuracy sense resistors (e.g., 0.13Ω for 1.5A). |
| Dimming interface | PWM on EN/DIM pin (100Hz–2kHz) - provides linear brightness control without color shift, compatible with MCU GPIO. |
| EMI compliance | CISPR25 Class 5 - meets stringent automotive radiated/conducted emissions limits without external spread-spectrum circuitry. |
| AEC-Q100 grade | Grade 1 (−40°C to +125°C TJ) - validated for under-hood and exterior lighting environments. |
Pinout & Package
MPQ4425BGJ-AEC1-Z is housed in a thermally enhanced TSOT23-8 package (2.9mm × 1.6mm × 0.85mm), optimized for high-power density and PCB heat dissipation via exposed pad (Pin 4 PGND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Power input | 4V–36V supply rail; requires ≥10μF ceramic input capacitor and wide PCB trace for surge current handling. |
| 2 /FAULT | Fault indicator | Open-drain output pulled low on LED open/short or thermal shutdown; requires external pull-up to VCC or VIN. |
| 3 EN/DIM | Enable & dimming control | Logic-high (>1.45V) enables operation; 100Hz–2kHz PWM applied here controls LED brightness proportionally. |
| 4 PGND | Power ground | Main return path for high-current switch node; must connect to large copper pour with multiple vias to minimize noise coupling. |
| 5 BST | Bootstrap supply | Connects to SW via 0.1μF ceramic capacitor; 20Ω resistor recommended between BST and SW to suppress ringing. |
| 6 FB | Current feedback | Monitors voltage across external sense resistor; 0.2V reference sets ILED = 0.2V / RSENSE. |
| 7 VCC | Bias supply | Internally regulated ~4.9V; decoupled with 0.1μF–0.22μF ceramic cap; capacitance >0.22μF risks instability. |
| 8 SW | Switch node | Drives external inductor; connects to BST capacitor and power inductor; requires short, low-inductance layout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual MOSFETs | 85mΩ HS + 50mΩ LS - eliminates external FETs and gate drivers, reducing BOM count and layout complexity. |
| Forced CCM operation | Maintains fixed 400kHz frequency across full load range - ensures predictable EMI profile and low output ripple at light load. |
| Valley-current OCP | Detects inductor valley current to prevent runaway during short-circuit - enables fast recovery without latch-off. |
| Thermal shutdown with hysteresis | 170°C trip / 140°C release - prevents permanent damage while allowing automatic restart after cooling. |
| Internal soft start | 0.9ms ramp time - limits inrush current and avoids output overshoot during cold-start or reset conditions. |
| LED fault detection | /FAULT asserts low on open-circuit, LED+ short-to-GND, or LED+ short-to-LED− - enables system-level diagnostics and fail-safe response. |
Applications
| Automotive Daytime Running Lights (DRL) | Automotive Front Fog Lamps |
|---|---|
|
Use Scenario: Constant-current drive of 4–6 white LEDs in series for daylight-visible illumination on passenger vehicles. IC Role / Device Role / Timing Role: Primary LED current regulator with PWM dimming interface synchronized to vehicle CAN bus commands. Use Value: Delivers stable 1.5A output across 8V–16V battery variations, maintaining consistent luminance without color shift or thermal derating. |
Use Scenario: High-brightness LED array powering fog lamps in adverse weather, requiring robust transient immunity. IC Role / Device Role / Timing Role: Synchronous buck controller managing inductor current and fault signaling to body control module (BCM). Use Value: Withstands 36V load-dump pulses and −40°C cold cranking, while CISPR25 Class 5 compliance avoids radio interference in cabin electronics. |
| Automotive Rear Combination Lamps | Commercial Vehicle Stop/Tail Lights |
|
Use Scenario: Dual-channel implementation (two MPQ4425B devices) driving brake and tail LED strings independently. IC Role / Device Role / Timing Role: Current-regulated switch-mode driver with independent /FAULT reporting per channel for ASIL-B functional safety monitoring. Use Value: Fault isolation enables BCM to distinguish between open-circuit (brake lamp failure) and short-circuit (wiring fault), improving diagnostic accuracy. |
Use Scenario: High-reliability LED lighting for trucks and buses where vibration, temperature extremes, and long service life are critical. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 LED driver providing 1.5A constant current with thermal foldback and undervoltage lockout. Use Value: 125°C max junction rating and QFN/TSOT packaging ensure >10-year operational life in under-bumper mounting locations. |
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-Z | 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 for higher ambient or sealed enclosures; requires different PCB footprint and reflow profile. | Select when board space permits larger package and thermal margin is prioritized over footprint size. |
| LM3409QMYX/NOPB | Adjustable 100kHz–1MHz frequency, external MOSFETs, no integrated HS/LS FETs - higher BOM count but greater flexibility in power stage design. | Suitable for >2A applications or custom inductor selection; lacks AEC-Q100 qualification and CISPR25 Class 5 validation. | Choose only if design requires >1.5A or programmable frequency; not drop-in compatible due to topology and qualification gap. |
Compared with MPQ4425BGQB-AEC1-Z, the MPQ4425BGJ-AEC1-Z offers identical electrical performance in a smaller TSOT23-8 footprint ideal for space-constrained headlamp modules, while LM3409QMYX/NOPB trades integration for configurability but lacks automotive qualification and EMI certification - making it unsuitable for production automotive lighting without additional validation.
Availability
MPQ4425BGJ-AEC1-Z is available at Aetrix Electronics and suitable for automotive daytime running lights, front fog lamps, rear combination lamps, and commercial vehicle stop/tail lights requiring stable component supply with AEC-Q100 Grade 1 assurance.
Supply support for MPQ4425BGJ-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 power management ICs, with over two decades of expertise in DC/DC conversion, LED drivers, and motor control solutions.
The MPQ4425B product line delivers AEC-Q100-qualified synchronous buck LED drivers targeting automotive exterior lighting, emphasizing integration, thermal robustness, and EMI compliance for zero-defect manufacturing in Tier-1 supply chains.
FAQ
What is the minimum required input voltage for reliable startup?
The MPQ4425BGJ-AEC1-Z has an input UVLO rising threshold of 3.5V typical, with 400mV hysteresis. Reliable startup occurs at ≥3.8V input, and the device sustains operation down to 4V per datasheet specification. Below 4V, the IC enters shutdown and disables switching to protect downstream LEDs.
Can the MPQ4425BGJ-AEC1-Z drive more than one LED string in parallel?
No - the device regulates current through a single sense resistor on the LED− path, supporting only one string. Parallel strings require individual current regulation to prevent thermal runaway; use separate MPQ4425BGJ-AEC1-Z units or a multi-channel controller like MPQ4470.
How does the /FAULT pin behave during thermal shutdown?
During thermal shutdown, the /FAULT pin is actively pulled low by an internal NMOS transistor. It remains low until die temperature falls below 140°C (30°C hysteresis), at which point the IC resumes normal operation and /FAULT returns high impedance (pulled up externally).
Is external compensation required for the current-loop stability?
No - the MPQ4425BGJ-AEC1-Z integrates an optimized compensation network. Only the FB pin requires connection to the sense resistor; no external RC network is needed for stable operation across temperature and load conditions.
What is the maximum allowable BST capacitor value?
The BST capacitor must be 0.1μF ceramic (X7R or better); values exceeding 0.22μF are prohibited per datasheet. Larger capacitance destabilizes the bootstrap regulator and may cause erratic high-side gate drive or premature OCP triggering.
Does the device support analog dimming via the FB pin?
No - analog dimming is not supported. The only dimming method is PWM applied to the EN/DIM pin (100Hz–2kHz). Modifying FB voltage disrupts current regulation and violates the intended control architecture.
What is the recommended PCB layout practice for the SW and BST nodes?
Keep SW and BST traces short, wide, and adjacent - ideally overlapping on adjacent layers - to minimize parasitic inductance. Place the BST capacitor directly between SW and BST pins with minimal trace length; add a 20Ω resistor in series with the BST capacitor to dampen ringing.
MPQ4425BGJ-AEC1-Z 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-Z FAQ
1.How can I place an order for MPQ4425BGJ-AEC1-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4425BGJ-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 MPQ4425BGJ-AEC1-Z reliable?
The price and inventory of MPQ4425BGJ-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 MPQ4425BGJ-AEC1-Z is usually 5 days.
3.What payment methods are accepted for MPQ4425BGJ-AEC1-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4425BGJ-AEC1-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4425BGJ-AEC1-Z?
MPQ4425BGJ-AEC1-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4425BGJ-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 MPQ4425BGJ-AEC1-Z?
For technical support, including MPQ4425BGJ-AEC1-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4425BGJ-AEC1-Z requirements.
6.How does Aetrix verify that MPQ4425BGJ-AEC1-Z is sourced from the original manufacturer or authorized distributors?
All MPQ4425BGJ-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 MPQ4425BGJ-AEC1-Z meets industry standards.
7.What is the process for return or replacement of MPQ4425BGJ-AEC1-Z?
All MPQ4425BGJ-AEC1-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4425BGJ-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 MPQ4425BGJ-AEC1-Z part is unused and in its original packaging.
Return procedure for MPQ4425BGJ-AEC1-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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