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Monolithic Power Systems Inc. MPQ3426DL-LF-P
- Part No.:
- MPQ3426DL-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 14-VFDFN Exposed Pad
- Datasheet:
-
MPQ3426DL-LF-P.pdf
- Description:
- IC REG BOOST PROG 6A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:453
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Product details
Overview
MPQ3426DL-LF-P from Monolithic Power Systems is a current-mode, AEC-Q100 Grade 1 qualified boost converter IC with integrated 6A/45V/90mΩ MOSFET, configurable 300kHz–2MHz switching frequency, 3.2V–22V input bias range, and 35V max output voltage-designed for automotive pre-boost and cold-crank applications requiring high reliability under load dump conditions.
For engineers reviewing the MPQ3426DL-LF-P datasheet, MPQ3426DL-LF-P pinout, MPQ3426DL-LF-P application, or MPQ3426DL-LF-P equivalent, key selection criteria include UVLO hysteresis programmability via EN resistor divider, soft-start capacitor timing control (6µA constant current), FSET-based frequency tuning, thermal shutdown at 160°C, and dual QFN-14 package options with wettable flanks support.
Technical Context
The MPQ3426DL-LF-P implements peak-current-mode control with internal transconductance error amplifier (GEA = 160 µA/V, AVEA = 300 V/V) and programmable oscillator via FSET pin (0.5V regulated reference). Its COMP pin enables full external loop compensation using R-C networks to stabilize systems with ceramic output capacitors down to 4.7µF.
It integrates three ground domains-PGND (pins 8,9,10), AGND (pin 11), and EP (exposed pad)-with strict separation requirements for noise immunity. The EN pin serves dual functions: on/off control and VIN UVLO hysteresis programming via external resistor divider, enabling precise startup threshold tuning independent of internal 3.1V UVLO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Rating | 6A continuous, 45V drain-source, 90mΩ RDS(on) - supports battery rail up to 45V during load dump without external FET. |
| Input Voltage Range | 3.2V to 22V biased supply - enables operation during automotive cold-crank (down to ~3V) when paired with external biasing. |
| Output Voltage Range | Up to 35V regulated - suitable for OLED bias, audio tuner supplies, and pre-boost stages feeding 24V/36V subsystems. |
| Switching Frequency | Configurable 300kHz–2MHz via FSET resistor - higher frequencies allow smaller magnetics and reduced EMI filtering complexity. |
| Soft-Start Control | 6µA constant-current charge into SS pin - sets inrush current ramp time (tSS = 2.5V / 6µA × CSS) for controlled startup. |
| UVLO Hysteresis | Programmable via EN pin sink current (4µA) and external resistors - decouples start-up threshold from fixed internal 3.1V UVLO. |
| Thermal Protection | 160°C junction shutdown with automatic recovery - prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
MPQ3426DL-LF-P is housed in a QFN-14 (3mm × 4mm) package with wettable flanks and an exposed thermal pad (EP). Pin 1 is marked by a top-side index area; the exposed pad must be soldered to a solid copper plane for thermal dissipation and PGND connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 COMP | Compensation node | Connects external RC network to set loop bandwidth and phase margin; directly drives error amplifier output. |
| 2 EN | Enable & UVLO programming | Active-high logic input; also sinks 4µA to enable programmable VIN UVLO hysteresis via external resistor divider. |
| 3 VIN | Bias supply input | Accepts 3.2V–22V; powers internal LDO and gate driver; can be sourced independently from boost input for extended low-VIN operation. |
| 4–6 SW | Power switch drain | Three paralleled pins connect to inductor and rectifier; share 6A current path and reduce trace inductance. |
| 7 VDD | LDO output | 5.9V regulated output; can be tied to BIAS rail to improve efficiency and extend low-input operation. |
| 8–10 PGND | Power ground return | Three dedicated low-impedance paths for switch current return; must be connected to EP and separated from AGND. |
| 11 AGND | Analog ground reference | Reference for FB, COMP, SS, FSET; connects to EP at single point only to avoid noise coupling. |
| 12 SS | Soft-start timing | Charged by internal 6µA current source; controls ramp rate of COMP voltage and initial switching frequency foldback. |
| 13 FB | Feedback input | Monitors output via resistor divider; internal 1.225V reference enables precise VOUT setting (e.g., 24V with R2/R3 = 187k/10k). |
| 14 FSET | Frequency set input | 0.5V-regulated node; sinking current sets fSW linearly (e.g., 84.5kΩ → 540kHz); enables EMI optimization. |
| 15 EP | Exposed thermal pad | Must be soldered to PCB ground plane; serves as primary PGND and thermal conduction path (θJA = 50°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 6A/45V power switch | Eliminates need for external MOSFET and driver; reduces BOM count and layout area in space-constrained automotive modules. |
| Configurable 300kHz–2MHz fSW | Enables trade-off between efficiency (lower fSW) and component size/EMI (higher fSW); supports spread-spectrum compatibility. |
| External loop compensation (COMP) | Allows stability optimization across wide VOUT/COUT combinations-including low-ESR ceramic caps-without redesigning feedback network. |
| EN-programmable UVLO hysteresis | Permits custom cold-crank detection thresholds (e.g., 4.2V start / 3.8V hold-off) using two resistors, improving system robustness. |
| Micro-power shutdown (<1µA) | Minimizes battery drain in always-on automotive modules (e.g., telematics, ADAS sensors) during ignition-off states. |
Applications
| Automotive Pre-Boost | Audio Tuner Bias Supply |
|---|---|
Use Scenario: Boosting 6–12V battery rail to stable 24V during engine cranking when input dips below 6V. IC Role / Device Role / Timing Role: Primary DC-DC regulator providing regulated pre-boost stage before downstream 24V loads (e.g., radar, camera modules). Use Value: Maintains 24V output down to 3.2V input with <10% ripple, enabling uninterrupted operation of safety-critical ADAS subsystems. | Use Scenario: Generating clean 12V bias for FM/AM tuner ICs and MEMS microphones in infotainment head units. IC Role / Device Role / Timing Role: High PSRR, low-noise boost converter supplying analog front-end circuitry with minimal switching interference. Use Value: Configurable 2MHz fSW allows use of small 2.2µH inductor and ceramic caps, reducing board area while meeting <5mVpp noise spec. |
| OLED Display Bias | SEPIC Converter Stage |
Use Scenario: Providing 30–35V anode bias for automotive OLED instrument cluster displays operating from 12V battery. IC Role / Device Role / Timing Role: High-voltage boost controller delivering precise, adjustable output with tight regulation (±1.5%) over temperature. Use Value: 35V absolute max VOUT and 45V MOSFET rating ensure safe operation during 45V load dump transients per ISO 7637-2. | Use Scenario: Implementing non-inverting SEPIC topology to regulate 12V output from variable 3.2–36V input (e.g., USB PD + battery hybrid supply). IC Role / Device Role / Timing Role: Core switching controller managing coupled inductor energy transfer and output regulation via FB pin. Use Value: Internal current-mode control and COMP pin flexibility enable stable SEPIC operation across 11:1 input range without loop re-tuning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ3425GJ-AEC1-Z | 4A/45V switch, fixed 500kHz fSW, no FSET or SS pins | Lacks frequency tuning and soft-start; limited to simpler, lower-power pre-boost designs | Select when cost sensitivity outweighs need for EMI optimization or inrush control. |
| LM5122MQ/NOPB | External MOSFET driver, 65V max input, no integrated switch | Requires discrete 6A FET and gate driver; supports >45V inputs but increases BOM and layout complexity | Select when input exceeds 45V or when thermal management requires remote FET placement. |
Compared with MPQ3426DL-LF-P, MPQ3425GJ-AEC1-Z trades configurability for lower unit cost and smaller footprint, while LM5122MQ/NOPB offers higher input voltage headroom at the expense of design effort and component count-making MPQ3426DL-LF-P optimal for AEC-Q100-compliant 12V/24V automotive boost where integration, programmability, and thermal performance are prioritized.
Availability
MPQ3426DL-LF-P is available at Aetrix Electronics and suitable for automotive pre-boost, OLED display bias, and audio tuner supply applications requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for MPQ3426DL-LF-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 core expertise in DC-DC conversion, motor drivers, and LED lighting controllers.
The MPQ3426 belongs to MPS's automotive-grade boost converter product line, engineered specifically for harsh-environment vehicle subsystems including infotainment, ADAS, and body electronics-emphasizing AEC-Q100 compliance, thermal resilience, and EMI robustness.
FAQ
What is the minimum input voltage required for MPQ3426DL-LF-P to start switching?
The MPQ3426DL-LF-P begins switching when VIN reaches its under-voltage lockout (UVLO) rising threshold of 2.75V to 3.15V (typ. 3.1V) at 25°C. With EN pin programmed for hysteresis, effective startup voltage can be raised-for example, a 100kΩ/13kΩ divider raises threshold to ~4.2V while maintaining ~400mV hysteresis-enabling reliable cold-crank operation.
Can MPQ3426DL-LF-P operate with ceramic output capacitors only?
Yes. The MPQ3426DL-LF-P's COMP pin and transconductance error amplifier are designed for direct interface with low-ESR ceramic output capacitors (e.g., 4.7µF–22µF X7R). Its compensation equations account for ceramic-dominated impedance, eliminating need for ESR-based zero compensation-verified in Table 2 of the datasheet for 3.2V–24V configurations.
How does the FSET pin set switching frequency, and what resistor yields 1MHz?
FSET regulates a 0.5V reference; current sinking from this pin linearly sets fSW per fSW ≈ 0.86 / RFSET (RFSET in kΩ). For 1MHz, solve 1000 = 0.86 / R → R ≈ 0.86kΩ. Standard value 845Ω yields ~1.017MHz. Resistor tolerance directly impacts frequency accuracy-use 1% metal film for ±2% fSW control.
Is the exposed pad (EP) electrically connected to PGND or AGND?
The EP is internally connected to PGND and must be soldered exclusively to the PCB's power ground plane. It is not connected to AGND; AGND (pin 11) must tie to EP at a single point only-typically near the EP-to prevent ground loops and maintain analog reference integrity for FB, COMP, and SS circuits.
What protection features are integrated, and how do they behave during fault conditions?
MPQ3426DL-LF-P integrates cycle-by-cycle current limiting (trip at 6.2–8.5A), thermal shutdown at 160°C (latches off until TJ < 145°C), and UVLO. During overcurrent, it skips pulses to limit average current; during overtemperature, it halts switching entirely and auto-recovers once cooled-no external reset required. All protections are fully specified across –40°C to +125°C.
Does MPQ3426DL-LF-P support synchronization to an external clock?
No. MPQ3426DL-LF-P lacks an external sync input; switching frequency is set solely by the FSET resistor. For synchronized multi-rail systems, designers must use frequency-selectable alternatives (e.g., MPQ4331) or accept free-running operation with careful layout to minimize beat-frequency EMI between converters.
MPQ3426DL-LF-P 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-P FAQ
1.How can I place an order for MPQ3426DL-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ3426DL-LF-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 MPQ3426DL-LF-P reliable?
The price and inventory of MPQ3426DL-LF-P 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-P is usually 5 days.
3.What payment methods are accepted for MPQ3426DL-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ3426DL-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ3426DL-LF-P?
MPQ3426DL-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ3426DL-LF-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 MPQ3426DL-LF-P?
For technical support, including MPQ3426DL-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ3426DL-LF-P requirements.
6.How does Aetrix verify that MPQ3426DL-LF-P is sourced from the original manufacturer or authorized distributors?
All MPQ3426DL-LF-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 MPQ3426DL-LF-P meets industry standards.
7.What is the process for return or replacement of MPQ3426DL-LF-P?
All MPQ3426DL-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MPQ3426DL-LF-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 MPQ3426DL-LF-P part is unused and in its original packaging.
Return procedure for MPQ3426DL-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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