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Monolithic Power Systems Inc. MPQ4425AGQB-P
- Part No.:
- MPQ4425AGQB-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- LED Drivers
- Package:
- 13-PowerVQFN
- Datasheet:
-
MPQ4425AGQB-P.pdf
- Description:
- IC LED DRVR RGLTR PWM 1.5A 13QFN
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
MPQ4425AGQB-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 4V–36V input range, operating at 2.2MHz fixed frequency, and qualified to AEC-Q100 Grade-1 for automotive lighting systems.
For engineers reviewing the MPQ4425AGQB-P datasheet, MPQ4425AGQB-P pinout, MPQ4425AGQB-P application, or MPQ4425AGQB-P equivalent, key selection criteria include its forced CCM operation, PWM dimming support (100Hz–2kHz), fault-indicating open-drain /FAULT pin, and CISPR25 Class 5 EMI compliance for safety-critical vehicle lighting designs.
Technical Context
The MPQ4425AGQB-P employs peak-current-mode control with internal 0.2V reference and valley-current detection for over-current protection, enabling fast transient response and stable regulation across wide input and load variations. Its integrated high-side and low-side MOSFETs eliminate external power switches while maintaining >90% efficiency at 12VIN/2×LED loads.
It features a dedicated bootstrap circuit (BST pin) with internal UVLO (2.2V rising threshold), thermal shutdown at 170°C with 30°C hysteresis, and a fault-indicator architecture that pulls /FAULT low on LED short/open or thermal events - all implemented in a wettable-flank QFN-13 (2.5mm×3mm) package optimized for automotive PCB assembly and thermal reliability.
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 without external protection. |
| Output Current | Up to 1.5A continuous - set via external RFB with 0.2V reference; enables driving high-brightness LED strings (e.g., 2× white LEDs @ 3.2V). |
| Switching Frequency | 2.2MHz nominal (1.8–2.6MHz range) - allows use of compact 2.2µH inductors and reduces EMI fundamental frequency above AM band. |
| Internal MOSFET RDS(on) | 85mΩ (HS) / 50mΩ (LS) - minimizes conduction loss and enables >92% efficiency at 12VIN, 1.5A, 2×LED output. |
| Fault Detection | Open-drain /FAULT pin asserts low on LED short, open-circuit, or thermal shutdown - provides system-level diagnostics without additional monitoring circuitry. |
| Dimming Interface | PWM dimming via EN/DIM pin (100Hz–2kHz) - enables precise brightness control with duty-cycle proportional output current; no analog current-setting DAC required. |
| EMI Compliance | CISPR25 Class 5 compliant - meets stringent automotive radiated emissions limits without external filters in typical layouts. |
Pinout & Package
MPQ4425AGQB-P is housed in a space-saving, wettable-flank QFN-13 package (2.5mm × 3mm, 0.5mm pitch), designed for automated optical inspection (AOI) and enhanced solder joint reliability in automotive production.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 IN | Power input supply rail | Accepts 4V–36V; requires local ceramic decoupling (≥4.7µF + 0.1µF) placed directly at pins to handle high di/dt switching currents. |
| 3 NC | No-connect terminal | Must remain unconnected; floating or tied to GND degrades thermal performance and may cause latch-up. |
| 4 /FAULT | Open-drain fault indicator | Pulled low during LED short/open or thermal shutdown; requires external pull-up (e.g., 100kΩ to VCC) for system-level fault reporting. |
| 5 EN/DIM | Enable and PWM dimming input | Logic-high (>1.45V) enables operation; 100Hz–2kHz PWM applied here controls LED brightness; internal 400kΩ pull-down enables shutdown when floated. |
| 6 FB | Current-sense feedback input | Monitors voltage across RFB; regulates LED current to maintain 0.2V at this pin - sets ILED = 0.2V / RFB. |
| 7 VCC | Internal bias regulator output | Supplies 4.9V ±4% to internal circuitry; requires 0.1–0.22µF ceramic capacitor directly between VCC and AGND for stability. |
| 8 AGND | Analog ground reference | Internal connection to PGND; serves as reference for FB, EN/DIM, and error amplifier - must be routed separately from noisy PGND traces until star-point tie. |
| 9 SW | Switch node output | Drives external inductor; high di/dt node requiring short, wide copper trace and tight coupling to PGND plane to minimize EMI. |
| 10 BST | Bootstrap supply for high-side gate driver | Requires 0.1–1µF capacitor between BST and SW; 20Ω series resistor recommended to suppress ringing and reduce SW voltage spikes. |
| 11, 12, 13 PGND | Power ground return path | Low-impedance return for HS/LS MOSFETs and inductor; must connect to large copper pour with multiple vias to inner ground planes for thermal and EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Forced Continuous Conduction Mode (CCM) | Maintains fixed 2.2MHz switching across 0–100% load, eliminating audible noise and ensuring predictable EMI spectrum and low output ripple at light loads. |
| Integrated Fault Protection | Detects and reports LED open/short and thermal shutdown via single /FAULT pin - eliminates need for external comparators or microcontroller GPIO monitoring. |
| AEC-Q100 Grade-1 Qualification | Rated for −40°C to +125°C junction temperature - validated for under-hood automotive applications including headlamps, DRLs, and fog lamps. |
| Internal Soft Start | 0.9ms controlled ramp-up of output current - prevents inrush into LED string and avoids overshoot during startup without external timing components. |
| Frequency Foldback | Automatically reduces switching frequency to 1.1MHz when input exceeds ~21V or during short-circuit - improves efficiency and thermal margin under overvoltage conditions. |
Applications
| Automotive Headlamp Driver | Daytime Running Light (DRL) Module |
|---|---|
|
Use Scenario: High-reliability constant-current drive for dual-white-LED headlamp arrays in passenger vehicles. IC Role / Device Role / Timing Role: Primary LED current controller with integrated power switches, PWM dimming interface, and fault signaling for ASIL-B–compatible lighting systems. Use Value: Eliminates external MOSFETs and sense resistors; achieves >92% efficiency at 12V/1.5A while meeting CISPR25 Class 5 emissions limits without added filtering. |
Use Scenario: Compact, thermally robust LED driver for front-end DRLs operating continuously across ambient temperatures from −40°C to +85°C. IC Role / Device Role / Timing Role: Synchronous buck regulator with AEC-Q100 qualification, internal soft-start, and thermal shutdown - ensures fail-safe operation during extended runtime. Use Value: Reduces BOM count by 4 components vs discrete solutions; wettable-flank QFN enables AOI-compatible reflow and long-term solder joint integrity. |
| Rear Combination Lamp Control | Commercial Vehicle Marker Light |
|
Use Scenario: Multi-string LED driver for brake/tail/turn signal functions where dynamic dimming and fault reporting are required. IC Role / Device Role / Timing Role: PWM-dimmable current source with EN/DIM pin accepting vehicle CAN-based PWM signals (100Hz–2kHz); /FAULT pin feeds microcontroller diagnostic bus. Use Value: Enables single-chip support for three lighting functions via external resistor selection and PWM mapping - simplifies harness design and reduces ECU GPIO usage. |
Use Scenario: High-input-range LED driver for 24V commercial trucks and buses, surviving load-dump transients up to 36V. IC Role / Device Role / Timing Role: Input-robust buck converter with 4V–36V operation, UVLO hysteresis (3.5V rise / 3.1V fall), and thermal shutdown - ensures uninterrupted operation in harsh electrical environments. Use Value: No external TVS or LDO needed for input protection; integrated OCP with valley-current detection prevents inductor saturation during intermittent shorts. |
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 | Same die, wettable-flank QFN-13 package - identical electrical specs and pinout. | Enhanced manufacturability: supports automated optical inspection (AOI) of solder joints; preferred for high-volume automotive SMT lines. | Select when AOI capability, IPC-A-610 Class 3 compliance, or zero-defect solder joint requirements are mandated. |
| LT3966EFE#PBF | Higher 3.2A output, 2MHz switching, but requires external MOSFETs and has larger 28-pin TSSOP package. | Supports multi-channel independent dimming (2× channels), but lacks integrated fault reporting and AEC-Q100 Grade-1 rating. | Choose only if >1.5A output or channel independence is required; otherwise, MPQ4425AGQB-P offers lower BOM cost and smaller footprint. |
Compared with MPQ4425AGQB-P, the MPQ4425AGQBE-AEC1 delivers identical performance with improved process control for solder joint inspection, while the LT3966EFE#PBF trades integration and automotive qualification for higher current and multi-channel flexibility - making the MPQ4425AGQB-P optimal for cost-sensitive, space-constrained, AEC-Q100–compliant single-string LED lighting.
Availability
MPQ4425AGQB-P is available at Aetrix Electronics and suitable for automotive headlamps, daytime running lights, rear combination lamps, and commercial vehicle marker lights requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for MPQ4425AGQB-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 manufacturing partnerships.
The MPQ4425A product line targets automotive LED lighting applications, delivering fully integrated, AEC-Q100–qualified DC-DC solutions that replace discrete MOSFET+controller designs while meeting stringent EMI, thermal, and reliability requirements.
FAQ
What is the maximum allowable input voltage for MPQ4425AGQB-P, and how does it handle load-dump transients?
The absolute maximum input voltage is +40V, with recommended operation up to 36V. The device sustains automotive load-dump events (ISO 7637-2 Pulse 5a) without damage due to internal clamp structures and robust gate oxide design. External input capacitance (≥10µF ceramic + bulk electrolytic) is required to absorb energy and limit dV/dt stress on the IN pin.
Can MPQ4425AGQB-P operate in discontinuous conduction mode (DCM), or is CCM enforced?
MPQ4425AGQB-P operates exclusively in forced continuous conduction mode (CCM) across all loads - from zero to full 1.5A. This is achieved via internal control logic that prevents skip-cycle or burst-mode operation, ensuring fixed 2.2MHz switching, low output ripple, and predictable EMI behavior even at light loads.
How is LED open-circuit fault detected, and what happens to the output when it occurs?
Open-circuit detection occurs when FB voltage rises above 140% of the 0.2V reference (i.e., >280mV) for >10µs. Upon detection, the /FAULT pin is pulled low, switching stops immediately, and the SW node floats at VIN. The IC remains latched in fault state until EN/DIM is cycled low for >25ms or VIN drops below UVLO threshold.
Is an external bootstrap diode required, and what benefit does it provide?
An external bootstrap diode (e.g., 1N4148) is optional but recommended for duty cycles >65% (e.g., VIN >24V with low-Vf LEDs). It improves high-side gate drive efficiency by reducing BST capacitor discharge losses, increasing overall conversion efficiency by ~0.8% at full load and high input voltage.
What is the minimum recommended RFB value, and why is it constrained?
The minimum recommended RFB is 133mΩ (for 1.5A output), based on 0.2V reference and 1.5A target. Lower values increase FB node current beyond the specified 100nA max, risking reference accuracy degradation and thermal drift. Values below 100mΩ are not characterized and may cause regulation instability.
Does MPQ4425AGQB-P support analog dimming, or is PWM the only method?
Only PWM dimming is supported via the EN/DIM pin (100Hz–2kHz). There is no analog dimming capability - the FB reference is fixed at 0.2V, and no current-adjustment DAC or voltage-controlled current source is integrated. Analog dimming would require external circuitry and is not recommended per datasheet guidance.
How does frequency foldback affect thermal performance during overvoltage conditions?
When VIN exceeds ~21V, frequency foldback reduces switching frequency from 2.2MHz to 1.1MHz, cutting switching losses nearly in half. This directly lowers junction temperature rise - measured data shows up to 12°C reduction at 36V/1.5A - extending safe operating time before thermal shutdown activates.
MPQ4425AGQB-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-P FAQ
1.How can I place an order for MPQ4425AGQB-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ4425AGQB-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-P reliable?
The price and inventory of MPQ4425AGQB-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-P is usually 5 days.
3.What payment methods are accepted for MPQ4425AGQB-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ4425AGQB-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ4425AGQB-P?
MPQ4425AGQB-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ4425AGQB-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-P?
For technical support, including MPQ4425AGQB-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ4425AGQB-P requirements.
6.How does Aetrix verify that MPQ4425AGQB-P is sourced from the original manufacturer or authorized distributors?
All MPQ4425AGQB-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-P meets industry standards.
7.What is the process for return or replacement of MPQ4425AGQB-P?
All MPQ4425AGQB-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ4425AGQB-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-P part is unused and in its original packaging.
Return procedure for MPQ4425AGQB-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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