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Monolithic Power Systems Inc. MPQ3426DL-LF-Z
- Part No.:
- MPQ3426DL-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 14-VFDFN Exposed Pad
- Datasheet:
-
MPQ3426DL-LF-Z.pdf
- Description:
- IC REG BOOST PROG 6A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:26,269
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Product details
Overview
MPQ3426DL-LF-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified 6A, 45V synchronous boost converter with configurable 300kHz–2MHz switching frequency, 90mΩ internal MOSFET, and programmable UVLO-designed for automotive pre-boost in cold-crank conditions where input drops to 3.2V while delivering up to 35V output.
For engineers reviewing the MPQ3426DL-LF-Z datasheet, MPQ3426DL-LF-Z pinout, MPQ3426DL-LF-Z application, or MPQ3426DL-LF-Z equivalent, key selection criteria include its 6A current capability under 125°C junction temperature, QFN-14 (3mm×4mm) wettable-flank–compatible package, soft-start capacitor programmability, and FSET-resistor–based frequency tuning for EMI-sensitive infotainment power rails.
Technical Context
The MPQ3426DL-LF-Z implements a constant-frequency, peak-current-mode control architecture with an integrated 45V/6A/90mΩ N-channel MOSFET switch and transconductance error amplifier (160μA/V gain). Its compensation pin (COMP) supports external RC networks for loop stability across ceramic-output-capacitor designs.
UVLO is programmable via EN pin biasing (4μA sink), enabling VIN hysteresis tuning; switching frequency is set linearly by FSET pin current (0.5V regulated reference); soft-start uses a 6μA constant-current source charging an external capacitor to limit inrush during cold-crank startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.2V to 22V - supports automotive battery range including cold-crank down to 3.2V with biased supply operation |
| Output Voltage Range | Up to 35V - enables pre-boost for 12V/24V systems powering 30V+ audio amplifiers or OLED displays |
| Switching Frequency | 300kHz to 2MHz - selectable via FSET resistor; higher frequencies allow smaller magnetics and reduced EMI filtering area |
| Internal Switch RDS(on) | 90mΩ at 25°C - enables 6A continuous output with low conduction loss in compact QFN-14 package |
| Quiescent Current | 650–900μA - ensures low standby power in always-on vehicle modules without compromising regulation accuracy |
| Thermal Shutdown | 160°C - protects against sustained overload in enclosed automotive enclosures with limited airflow |
| Feedback Reference | 1.225V ±25mV - high-accuracy reference enables precise output voltage setting with standard 1% resistors |
Pinout & Package
MPQ3426DL-LF-Z is housed in a thermally enhanced QFN-14 (3mm × 4mm) package with exposed thermal pad (EP) and wettable flanks for automated optical inspection. The package supports JEDEC MO-229 VEED-5 footprint and requires soldering of EP to PCB ground plane for optimal thermal performance (θJA = 50°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 COMP | Compensation node | Connects external RC network to stabilize control loop; sets poles/zeros for ceramic-capacitor–based output filters |
| 2 EN | Enable control input | Logic-level on/off control; also programs VIN UVLO hysteresis via external resistor divider |
| 3 VIN | Bias supply input | Accepts 3.2V–22V; powers internal LDO; can be decoupled separately from main input for noise isolation |
| 4–6 SW | Power switch drain | Three paralleled pins reduce trace inductance and thermal resistance for 6A switching current path |
| 7 VDD | LDO output | 5.9V max output; can be tied to BIAS rail to extend low-VIN operation and improve efficiency |
| 8–10 PGND | Power ground | Three dedicated ground pins minimize ground bounce and support high di/dt return paths |
| 11 AGND | Analog ground | Reference for FB, COMP, SS; must connect to EP at single point to avoid noise coupling into feedback path |
| 12 SS | Soft-start timing | 6μA constant-current source charges external capacitor; controls ramp rate of COMP voltage to limit inrush |
| 13 FB | Feedback input | 1.225V reference; connects to resistor divider for precise output voltage regulation |
| 14 FSET | Frequency set | 0.5V-regulated node; sinking current sets fSW linearly (e.g., 84.5kΩ → 540kHz) |
| 15 EP | Exposed thermal pad | Must be soldered to solid copper pour; primary thermal path to PCB; electrically connected to PGND |
Key Features
| Feature | Design Value |
|---|---|
| 6A integrated MOSFET | Eliminates external high-current switch and gate driver; reduces BOM count and layout complexity in space-constrained automotive ECUs |
| Configurable 300kHz–2MHz fSW | Enables EMI compliance tuning: lower frequencies for high-efficiency battery-powered modes; higher frequencies for compact filter design in head-unit applications |
| AEC-Q100 Grade 1 qualification | Validated for -40°C to +125°C ambient operation-meets automotive reliability requirements for engine bay and cabin electronics |
| Programmable UVLO with hysteresis | Allows system-level brown-out recovery tuning via EN resistor divider-critical for robust cold-crank behavior in 12V vehicles |
| Micro-power shutdown (<1μA) | Supports ultra-low-power sleep modes in always-on telematics modules without draining backup battery |
Applications
| Automotive Cold-Crank Pre-Boost | Audio Microphone Bias Supply |
|---|---|
Use Scenario: Vehicle battery drops below 6V during engine cranking; ECU must maintain stable 12V rail for critical sensors and CAN transceivers. IC Role / Device Role / Timing Role: Step-up regulator boosting 3.2V–6V input to regulated 9.4V output; operates continuously during cranking with fast transient response. Use Value: Delivers 17.5W at 4.2V input (per Table 4), sustaining microcontroller operation when alternator is offline-enabling fail-safe diagnostics and communication. | Use Scenario: High-fidelity automotive microphone array requiring low-noise, ripple-free 5V–12V bias for MEMS elements in active noise cancellation systems. IC Role / Device Role / Timing Role: Low-ripple boost converter generating clean 12V from 5V domain; configured at 1MHz to push switching noise beyond audio band. Use Value: Achieves <15mVpp output ripple with 4.7μF ceramic output caps-meeting SNR >110dB requirement for premium cabin audio processing. |
| OLED Display Bias Supply | SEPIC Automotive Power Converter |
Use Scenario: In-dash OLED display needing dual-rail ±15V or single 30V+ bias from 12V battery, with strict EMI limits near touch controller. IC Role / Device Role / Timing Role: High-voltage boost stage generating up to 35V output; operated at 600kHz to balance efficiency and filter size. Use Value: Supports 30V/1A output with 90mΩ RDS(on), enabling >92% efficiency at full load-reducing thermal load in sealed display bezel. | Use Scenario: Automotive infotainment system requiring non-inverting buck-boost topology to regulate 12V output from variable 3.2V–36V input (e.g., start-stop, load dump). IC Role / Device Role / Timing Role: Core switching element in SEPIC configuration; leverages internal 45V rating and current-mode control for wide-input stability. Use Value: Enables seamless transition between battery (12V) and alternator (14.5V) sources without output interruption-verified in Figure 6 schematic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ3426GRE-AEC1-Z | Same die, QFN-14 (4mm×4mm) package with wettable flanks; θJA = 47.2°C/W vs. 50°C/W | Better thermal performance and AOI compatibility; larger footprint may conflict with dense PCB layouts | Select when thermal margin is critical or automated optical inspection is required in production |
| LM5122MQ/NOPB | External MOSFET drive; 65V rating; no integrated 6A switch; requires gate driver and discrete FETs | Higher voltage capability but increased component count and layout sensitivity; lacks AEC-Q100 Grade 1 certification | Choose only if >45V input handling is mandatory and board area allows discrete power stage |
Compared with MPQ3426DL-LF-Z, the MPQ3426GRE-AEC1-Z offers superior thermal dissipation in thermally constrained environments, while the LM5122MQ/NOPB trades integration for extended input voltage range-making the MPQ3426DL-LF-Z optimal for cost-, size-, and qualification-sensitive automotive pre-boost designs.
Availability
MPQ3426DL-LF-Z is available at Aetrix Electronics and suitable for automotive cold-crank pre-boost, OLED display bias supplies, and audio microphone power rails requiring stable component supply with AEC-Q100 Grade 1 assurance and RoHS-compliant packaging.
Supply support for MPQ3426DL-LF-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 leadership in DC/DC conversion, motor drivers, and automotive-grade analog solutions.
The MPQ3426 belongs to MPS's AEC-Q100–qualified automotive boost converter product line, engineered specifically for reliable pre-boost, cold-crank, and high-voltage bias generation in safety-critical vehicle subsystems.
FAQ
What is the minimum input voltage required for MPQ3426DL-LF-Z to start switching?
The MPQ3426DL-LF-Z begins switching when VIN rises above its under-voltage lockout threshold of 2.75V to 3.15V (typical 3.1V), verified across temperature. Startup requires both sufficient VIN and a valid EN signal; the device remains latched off until VIN exceeds UVLO and EN is pulled high, ensuring robust cold-crank behavior down to 3.2V nominal operation.
Can MPQ3426DL-LF-Z operate in discontinuous conduction mode (DCM)?
Yes-the MPQ3426DL-LF-Z supports both continuous and discontinuous conduction modes depending on load, inductance, and switching frequency. Its peak-current-mode architecture inherently adapts to DCM at light loads, reducing switching losses and maintaining regulation without external mode control. The right-half-plane zero disappears in DCM, simplifying compensation.
How is the switching frequency set, and what resistor value yields 1MHz operation?
Switching frequency is set by a resistor from FSET (Pin 14) to AGND; FSET regulates to 0.5V and sinks current linearly. For 1MHz, use RFSET = 35.7kΩ (per Table 1), yielding 1.06MHz. The relationship is fSW ≈ 0.23 / RFSET (with RFSET in MΩ), allowing precise EMI tuning without changing inductors or capacitors.
Is the exposed pad (EP) electrically connected internally, and how should it be routed?
Yes-the EP is internally connected to PGND and serves as the primary thermal and electrical ground path. It must be soldered to a solid copper pour tied directly to the system PGND plane using ≥4 thermal vias (0.3mm diameter) spaced evenly under the pad. Do not isolate EP or route signals beneath it, as this degrades thermal performance and increases noise coupling.
Does MPQ3426DL-LF-Z support output short-circuit protection?
No-the MPQ3426DL-LF-Z provides overcurrent limiting (6.2–8.5A typical) and thermal shutdown (160°C), but lacks active short-circuit foldback or hiccup mode. Under sustained output short, the device enters thermal shutdown, then recovers after cooldown. External protection (e.g., polyfuse or eFuse) is recommended for systems requiring fault containment.
What is the maximum achievable output current at 24V output with 12V input?
At VIN = 12V, VOUT = 24V, and TA = 25°C, the MPQ3426DL-LF-Z delivers up to 2.5A continuous output (60W) before thermal limiting, based on 2.5W power dissipation limit (QFN-14 3×4mm) and 90mΩ RDS(on). Derating is required above 85°C ambient; full 6A capability applies only at lower VOUT or forced-air cooling.
How does the EN pin's UVLO hysteresis function, and can it be disabled?
The EN pin includes a 4μA current sink that creates programmable hysteresis: rising VIN must overcome both the EN threshold (~1.5V) and the IR drop across the top resistor to enable startup; falling VIN releases at lower voltage due to sink removal. Hysteresis cannot be disabled-it is intrinsic to the EN architecture-but its magnitude is fully adjustable via external resistor values per Figure 2.
MPQ3426DL-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 14-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.2V
- Voltage - Input (Max):
- 22V
- Voltage - Output (Min/Fixed):
- 3.2V
- Voltage - Output (Max):
- 35V
- Current - Output:
- 6A
- Frequency - Switching:
- 300kHz ~ 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-QFN (3x4)
MPQ3426DL-LF-Z FAQ
1.How can I place an order for MPQ3426DL-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ3426DL-LF-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 MPQ3426DL-LF-Z reliable?
The price and inventory of MPQ3426DL-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ3426DL-LF-Z is usually 5 days.
3.What payment methods are accepted for MPQ3426DL-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ3426DL-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ3426DL-LF-Z?
MPQ3426DL-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ3426DL-LF-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 MPQ3426DL-LF-Z?
For technical support, including MPQ3426DL-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ3426DL-LF-Z requirements.
6.How does Aetrix verify that MPQ3426DL-LF-Z is sourced from the original manufacturer or authorized distributors?
All MPQ3426DL-LF-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 MPQ3426DL-LF-Z meets industry standards.
7.What is the process for return or replacement of MPQ3426DL-LF-Z?
All MPQ3426DL-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ3426DL-LF-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 MPQ3426DL-LF-Z part is unused and in its original packaging.
Return procedure for MPQ3426DL-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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