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Monolithic Power Systems Inc. MP3426DL-LF-P
- Part No.:
- MP3426DL-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 14-VFDFN Exposed Pad
- Datasheet:
-
MP3426DL-LF-P.pdf
- Description:
- IC REG BOOST ADJ 6A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,591
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Product details
Overview
MP3426DL-LF-P from Monolithic Power Systems is a current-mode 6A, 35V boost converter IC with integrated 90mΩ/45V MOSFET, programmable switching frequency (300kHz–2MHz), adjustable UVLO, and soft-start control. It operates from 3.2V–22V input and delivers regulated high-voltage bias for telecom power supplies, microphone preamps, and automotive infotainment displays.
For engineers reviewing the MP3426DL-LF-P datasheet, MP3426DL-LF-P pinout, MP3426DL-LF-P application, or MP3426DL-LF-P equivalent, key selection criteria include its 6A switch current limit, 1.225V FB reference accuracy, QFN-14 (3mm×4mm) thermal performance (θJA = 50°C/W), and FSET resistor-based frequency programming-critical for EMI-sensitive portable and automotive designs.
Technical Context
The MP3426DL-LF-P implements constant-frequency peak-current-mode control with internal transconductance error amplifier (GEA = 160μA/V, AVEA = 300V/V) and COMP pin for external loop compensation. Its architecture includes right-half-plane zero mitigation logic for stable operation across wide duty cycles.
It integrates programmable UVLO hysteresis via EN pin current sink (4μA), soft-start timing controlled by 6μA constant current into SS pin, and FSET pin regulating frequency linearly via 0.5V reference and external resistor (e.g., 84.5kΩ → 540kHz). Thermal shutdown activates at 160°C with automatic recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.2V to 22V - supports single-cell Li-ion up to 19V automotive rail without pre-regulation |
| Output Voltage Range | Up to 35V - enables high-bias rails for RF amplifiers and CCD sensors |
| Switch Current Limit | 6.8A to 8.5A - ensures robust startup into capacitive loads and transient overload survival |
| FB Reference Voltage | 1.225V ±25mV - enables <±1% output regulation with standard 1% resistors |
| Switching Frequency Range | 300kHz to 2MHz - allows trade-off between inductor size (smaller at 2MHz) and efficiency (higher at 300kHz) |
| Quiescent Supply Current | 650–900μA - minimizes standby loss in battery-powered microphone bias circuits |
| Thermal Shutdown Threshold | 160°C - protects die during sustained overload or poor PCB copper pour |
Pinout & Package
MP3426DL-LF-P is housed in a thermally enhanced 14-pin QFN package (3mm × 4mm, 0.75mm height) with exposed pad for direct PCB ground connection and low θJC = 12°C/W thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 COMP | Compensation node | Connects RC network to AGND for loop stability; sets dominant pole/zero for phase margin >45° |
| 2 EN | Enable / UVLO control | Active-high logic input; also sinks 4μA to program VIN UVLO hysteresis via external divider |
| 3 VIN | Main input supply | Must be bypassed locally with ≥4.7μF ceramic capacitor; max 22V rating |
| 4–6 SW | Power switch drain | High-current path to inductor; shared 3-pin layout reduces trace inductance and switching losses |
| 7 VDD | Internal LDO output | 5.6–5.9V regulated supply for gate drive and analog circuitry; decoupling required |
| 8–10, 11 PGND/AGND | Power & analog ground | PGND pins handle high di/dt return; AGND connects to exposed pad at single-point star ground |
| 12 SS | Soft-start timer | Charged by 6μA current; 2.5V threshold ends soft-start, limiting inrush to <1.5× steady-state IIN |
| 13 FB | Feedback input | Senses resistor divider output; 1.225V reference enables precise VOUT setting with minimal offset error |
| 14 FSET | Frequency set | 0.5V-regulated node; RFSET value directly determines fSW per f = 0.86/RFSET (RFSET in kΩ, f in MHz) |
| 15 EP | Exposed thermal pad | Must be soldered to solid GND plane; primary thermal path for 2.5W max power dissipation at TA=25°C |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 6A, 90mΩ MOSFET | Eliminates external high-side switch and associated gate-drive complexity in compact boost designs |
| Programmable UVLO with hysteresis | EN pin current sink enables precise, adjustable input undervoltage lockout without extra comparators |
| External compensation (COMP pin) | Enables full control over loop dynamics for optimal transient response across varying COUT/ESR conditions |
| Soft-start via SS pin | 6μA constant-current ramp limits peak inductor current during startup, preventing input brownout |
| Micropower shutdown (<1μA) | Reduces system standby current in always-on audio bias rails and IoT sensor nodes |
Applications
| Telecom Power Supplies | Audio Microphone Bias |
|---|---|
|
Use Scenario: Generating +12V or +24V bias for PoE-powered VoIP phones and base station RF front-ends. IC Role / Device Role / Timing Role: Primary DC-DC boost regulator delivering stable, low-noise high-voltage rail from 5V or 12V backplane. Use Value: Programmable 2MHz switching enables use of <10μH inductors, reducing board area by 40% vs. 500kHz solutions. |
Use Scenario: Providing +5V to +12V phantom power for MEMS and electret condenser microphones in laptops and conferencing systems. IC Role / Device Role / Timing Role: Low-quiescent-current boost converter operating in burst mode during silence to extend battery life. Use Value: 650–900μA quiescent current and <1μA shutdown minimize idle power draw in always-listening voice interfaces. |
| Automotive Infotainment Displays | Industrial Sensor Excitation |
|
Use Scenario: Supplying +15V to +24V backlight drivers and LCD bias rails in dash-mounted head units with 9–16V battery input. IC Role / Device Role / Timing Role: High-reliability boost controller with thermal shutdown and UVLO hysteresis for harsh under-hood environments. Use Value: 160°C thermal shutdown and -40°C to +125°C junction rating ensure continuous operation across automotive temperature extremes. |
Use Scenario: Generating precise +10V excitation voltage for strain gauges and piezoresistive pressure sensors in factory automation modules. IC Role / Device Role / Timing Role: Accuracy-critical boost regulator with 1.225V ±25mV FB reference and low-output-ripple design. Use Value: Tight FB tolerance and external compensation enable <0.5% output regulation drift over temperature and load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| RT4801BZSP | 4A switch current, fixed 500kHz fSW, no FSET or UVLO programming | Lacks programmable frequency and UVLO hysteresis; limited to fixed-frequency, lower-power applications | Select when board space is constrained and 4A output suffices; avoid where EMI filtering or input brownout immunity is critical |
| TPS61088RHLR | 10A switch, 2.7V–12V input, no external COMP, integrated soft-start | Higher current but narrower input range; lacks loop compensation flexibility for ceramic-capacitor-dominated outputs | Prefer for high-current, low-input-voltage apps (e.g., USB PD); MP3426DL-LF-P better for 3.2–22V industrial inputs requiring stability tuning |
Compared with RT4801BZSP and TPS61088RHLR, MP3426DL-LF-P uniquely balances 6A capability, wide 3.2–22V input, and full analog control (FSET, COMP, SS, EN-programmed UVLO), making it optimal for noise-sensitive, thermally demanding, or multi-rail industrial boost designs where loop tuning and startup control are mandatory.
Availability
MP3426DL-LF-P is available at Aetrix Electronics and suitable for telecom power supplies, audio microphone bias circuits, automotive infotainment displays, and industrial sensor excitation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MP3426DL-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 analog and power ICs, with over two decades of leadership in DC-DC conversion, motor drivers, and LED lighting controllers.
The MP3426 belongs to MPS's high-current boost converter product line, designed specifically for applications demanding compact, efficient, and thermally robust step-up regulation in space-constrained industrial, automotive, and communications equipment.
FAQ
What is the maximum recommended output voltage for MP3426DL-LF-P?
The absolute maximum rated output voltage is 35V, as specified in the Absolute Maximum Ratings table. Operation above this level risks permanent damage to the internal 45V MOSFET. For reliable long-term operation, design targets should stay ≤33V to maintain sufficient voltage margin against transients and ripple peaks.
Can MP3426DL-LF-P operate with an input voltage below 3.2V?
No. The Recommended Operating Conditions specify a minimum input voltage of 3.2V. Below this, the internal bias circuitry fails to start reliably, and the UVLO circuit prevents switching. Attempting operation at 3.0V may result in erratic startup, dropout, or thermal stress due to excessive duty cycle.
How is switching frequency set on MP3426DL-LF-P?
Frequency is set by connecting a resistor (RFSET) from FSET pin (14) to AGND. The relationship is fSW (MHz) ≈ 0.86 / RFSET (kΩ). For example, 84.5kΩ yields ~540kHz. The FSET pin maintains a regulated 0.5V, so current flow is linear and highly predictable across temperature.
What is the purpose of the exposed pad (EP) on the QFN package?
The exposed pad is electrically and thermally connected to PGND. It must be soldered to a dedicated PCB copper pour tied to the main power ground plane. This provides the primary thermal conduction path (θJC = 12°C/W) and reduces junction temperature rise by up to 35°C compared to non-soldered pads, essential for 6A continuous operation.
Does MP3426DL-LF-P support forced PWM or skip-mode operation?
No. MP3426DL-LF-P operates exclusively in constant-frequency peak-current-mode control. It does not feature pulse-skipping, burst-mode, or forced-PWM selection pins. Light-load efficiency is maintained via low quiescent current (650–900μA), not modulation scheme changes.
Is the FB reference voltage trimmed at production?
Yes. The FB reference voltage is trimmed to 1.225V ±25mV (±2.0%) over temperature and process, as confirmed in the Electrical Characteristics table. This tight tolerance enables accurate output regulation using standard 1% feedback resistors without calibration.
What failure protections are built into MP3426DL-LF-P?
It integrates three independent protection mechanisms: cycle-by-cycle current limiting (6.8–8.5A), thermal shutdown at 160°C with automatic hysteresis-based recovery, and input UVLO with user-programmable hysteresis via EN pin. All are fully internal and require no external components.
MP3426DL-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:
- Adjustable
- 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 (Switch)
- Frequency - Switching:
- 300kHz ~ 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-QFN (3x4)
MP3426DL-LF-P FAQ
1.How can I place an order for MP3426DL-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3426DL-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 MP3426DL-LF-P reliable?
The price and inventory of MP3426DL-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 MP3426DL-LF-P is usually 5 days.
3.What payment methods are accepted for MP3426DL-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3426DL-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3426DL-LF-P?
MP3426DL-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3426DL-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 MP3426DL-LF-P?
For technical support, including MP3426DL-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3426DL-LF-P requirements.
6.How does Aetrix verify that MP3426DL-LF-P is sourced from the original manufacturer or authorized distributors?
All MP3426DL-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 MP3426DL-LF-P meets industry standards.
7.What is the process for return or replacement of MP3426DL-LF-P?
All MP3426DL-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP3426DL-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 MP3426DL-LF-P part is unused and in its original packaging.
Return procedure for MP3426DL-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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