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Monolithic Power Systems Inc. MP3425DL-LF-Z
- Part No.:
- MP3425DL-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 14-VFDFN Exposed Pad
- Datasheet:
-
MP3425DL-LF-Z.pdf
- Description:
- IC REG BOOST ADJ 3A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:12,436
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Product details
Overview
MP3425DL-LF-Z from Monolithic Power Systems is a current-mode 3.5A, 55V boost converter IC with integrated 90mΩ MOSFET, programmable switching frequency (300kHz–2MHz), and adjustable UVLO/soft-start. It delivers up to 350mA at 48V from a 12V input and operates from 3.1V–22V input, targeting high-voltage bias generation in telecom and audio systems.
For engineers reviewing the MP3425DL-LF-Z datasheet, MP3425DL-LF-Z pinout, MP3425DL-LF-Z application, or MP3425DL-LF-Z equivalent, key selection criteria include its 55V output capability, 3.5A switch current limit, QFN-14 (3×4mm) thermal performance, and external compensation flexibility for stable ceramic-capacitor-based designs.
Technical Context
The MP3425 employs peak-current-mode control with a transconductance error amplifier (160μA/V gain) and internal 1.225V reference, enabling precise output regulation across wide input/output ranges. Its PWM logic integrates oscillator, current-sense amplifier, and gate driver with built-in thermal shutdown (160°C) and cycle-by-cycle current limiting.
Frequency programming via FSET pin uses a linear 0.5V-regulated current sink (RFSET sets fSW per fSW = 0.86/RFSET MHz), while soft-start is controlled by a 5μA constant-current source charging an external capacitor - both features directly configure loop dynamics and inrush behavior without additional ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1V to 22V - supports single-cell Li-ion up to 18V rail inputs without pre-regulation. |
| Output Voltage Range | Up to 55V - enables direct generation of telecom -48V bias or audio microphone supply rails. |
| Switch Current Limit | 3.5A typical - defines maximum inductor peak current and load capability under short-circuit conditions. |
| Switching Frequency | 300kHz to 2MHz - higher frequencies allow smaller magnetics and reduced EMI filtering footprint. |
| Feedback Reference | 1.225V ±25mV - sets output voltage accuracy via external resistor divider (e.g., R2=383kΩ, R3=10kΩ → 48V). |
| Quiescent Current | 650–900μA - enables low-power operation in always-on bias supplies without excessive standby loss. |
| UVLO Threshold | 3.1V rising, 2.8V falling - prevents erratic startup during brownout; hysteresis programmable via EN pin current sink. |
| Thermal Shutdown | 160°C - protects die during overload or poor PCB thermal design; auto-recovery on cooldown. |
Pinout & Package
MP3425DL-LF-Z is housed in a thermally enhanced 14-pin QFN package (3mm × 4mm, 0.75mm height) with exposed power ground pad (EP) soldered to PCB copper for θJA = 50°C/W and θJC = 12°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 COMP | Compensation node | Connects external RC network to set loop stability poles/zeros; critical for transient response with ceramic output caps. |
| 2 EN | Enable control / UVLO programming | Active-high logic input; also sinks 4μA to set UVLO hysteresis when used with resistor divider from VIN. |
| 3 VIN | Main input supply | Must be locally bypassed with ≥4.7μF low-ESR capacitor; handles full input ripple current. |
| 4–6 SW | Power switch drain terminals | Three paralleled pins reduce conduction loss and thermal resistance for 3.5A switch current. |
| 7 VDD | Internal LDO output | Provides gate drive voltage; requires local 10nF decoupling to maintain stable switching under load transients. |
| 8–10, EP | Power ground (PGND) | Exposed pad and four dedicated pins minimize ground loop inductance and improve thermal dissipation. |
| 11 AGND | Analog ground reference | Separate analog return path for FB, COMP, SS; must connect to PGND only at single point near EP. |
| 12 SS | Soft-start timing | Charged by internal 5μA current source; controls ramp rate of COMP voltage to limit inrush current. |
| 13 FB | Feedback input | Senses output via resistor divider; 1.225V reference enables accurate output setting with <±2% tolerance. |
| 14 FSET | Frequency programming | Current sink regulated at 0.5V; resistor to AGND sets fSW linearly (e.g., 66.5kΩ → 620kHz). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.5A/55V MOSFET | Eliminates external high-voltage switch and reduces BOM count while maintaining 90mΩ RDS(on) at 5V gate drive. |
| Programmable 300kHz–2MHz fSW | Enables optimization between efficiency (lower fSW) and size (higher fSW) without changing IC or layout. |
| External compensation (COMP pin) | Allows full control over loop bandwidth and phase margin using standard RC components - essential for ceramic-capacitor stability. |
| Adjustable UVLO and soft-start | EN pin hysteresis and SS capacitor value let designers tailor startup behavior to system-level power sequencing requirements. |
| Micropower shutdown (<1μA) | Supports ultra-low-power sleep modes in battery-powered audio or sensor nodes where quiescent current is critical. |
| Thermal shutdown + current limiting | Hardware-level protection ensures robustness during output short or overload without requiring external monitoring circuitry. |
Applications
| Telecom Bias Supply | Audio Microphone Bias |
|---|---|
|
Use Scenario: Generating stable -48V or +48V bias for telecom line cards and optical modules. IC Role / Device Role / Timing Role: Primary DC-DC boost regulator delivering regulated high-voltage rail from intermediate 12V or 24V backplane. Use Value: Achieves 48V @ 350mA from 12V input with <85% efficiency, eliminating need for transformer-based isolated supplies. |
Use Scenario: Providing phantom power (12–48V) to condenser microphones in portable audio recorders and conferencing systems. IC Role / Device Role / Timing Role: Non-isolated high-efficiency boost converter powering mic preamp stages with low noise and fast transient response. Use Value: Delivers clean 48V output with <10mVpp ripple using 4.7μF ceramic output cap, meeting IEC 61000-4-2 ESD immunity requirements. |
| Automotive Infotainment Tuner | Industrial Sensor Excitation |
|
Use Scenario: Supplying 24–36V bias to AM/FM tuner front-ends in automotive head units operating from 9–16V battery input. IC Role / Device Role / Timing Role: Compact, AEC-Q200-compatible (with appropriate derating) boost stage replacing discrete solutions. Use Value: Maintains regulation down to 3.1V input, supporting cold-crank operation while delivering 300mA at 36V with <100μs load-step recovery. |
Use Scenario: Driving precision 24–50V excitation for piezoresistive pressure sensors or MEMS accelerometers in industrial PLC modules. IC Role / Device Role / Timing Role: Programmable, stable high-voltage source with tight output tolerance (±1.5%) and low temperature drift. Use Value: Enables ratiometric measurement accuracy by holding excitation voltage within ±0.5% over -40°C to +85°C ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3467EMS#TRPBF | Fixed 1.3MHz fSW, 2.5A switch, no FSET/SS programmability, higher 2.5V UVLO threshold. | Lacks adjustable soft-start and frequency tuning - less flexible for EMI-sensitive or low-input-voltage designs. | Choose when fixed-frequency simplicity outweighs need for startup control or wide input range. |
| TPS61088RHLR | 5.5A switch, 2.7V–12V input, max 28V output, integrated soft-start but no external compensation pin. | Lower output voltage ceiling limits use in 48V telecom/audio; lacks COMP pin for custom loop shaping. | Prefer for high-current, lower-VOUT apps where board space is constrained and loop tuning is not required. |
Compared with LT3467EMS#TRPBF and TPS61088RHLR, MP3425DL-LF-Z uniquely combines 55V output capability, 3.5A switch current, full external loop compensation, and programmable UVLO/soft-start - making it optimal for high-voltage, design-flexible bias generation where stability and startup control are critical.
Availability
MP3425DL-LF-Z is available at Aetrix Electronics and suitable for telecom power supply, audio microphone bias, and industrial sensor excitation requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP3425DL-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 analog and power ICs, with core expertise in DC-DC conversion, motor drivers, and LED lighting controllers.
The MP3425 belongs to MPS's high-voltage boost converter product line, designed specifically for compact, efficient generation of 24–55V bias rails in space-constrained telecom, audio, and industrial applications where programmability and thermal robustness are essential.
FAQ
What is the minimum input voltage required for MP3425DL-LF-Z to start switching?
The MP3425DL-LF-Z begins switching when input voltage rises above its undervoltage lockout (UVLO) threshold of 3.1V (typical). This ensures reliable startup from single-cell Li-ion (3.0V cutoff) or 3.3V system rails. The UVLO hysteresis is 250mV, so the device remains active until VIN drops to ~2.85V.
Can MP3425DL-LF-Z generate 48V output from a 5V input?
Yes - MP3425DL-LF-Z supports output voltages up to 55V from inputs as low as 3.1V. At 5V input, it can deliver 48V at ~150mA (derated for efficiency and thermal limits), using a 33μH inductor, Schottky diode, and proper compensation network per the datasheet's Component Selection Table.
How is switching frequency programmed on MP3425DL-LF-Z?
Switching frequency is set by connecting a resistor (RFSET) from the FSET pin (Pin 14) to AGND. The internal 0.5V-regulated current sink draws current IFSET = 0.5V/RFSET, and fSW = 0.86/RFSET (RFSET in kΩ, fSW in MHz). For example, 66.5kΩ yields ~620kHz.
Does MP3425DL-LF-Z require an external Schottky diode?
Yes - MP3425DL-LF-Z is a boost controller with integrated switch but no synchronous rectifier. An external Schottky diode (e.g., 50V, 3A rating) is mandatory between SW and VOUT to complete the boost path. Diode reverse voltage must exceed maximum output voltage; forward voltage impacts efficiency.
What is the purpose of the exposed pad (EP) on the QFN package?
Pin 15 (EP) is the power ground connection and thermal interface. It must be soldered to a large PCB copper area to achieve θJA = 50°C/W. Not connecting EP degrades thermal performance by >30°C and risks thermal shutdown under load - it is not optional for rated operation.
How does the soft-start function work, and how is it configured?
MP3425DL-LF-Z implements soft-start via a 5μA internal current source charging an external capacitor (CSS) from Pin 12 (SS) to AGND. Start-up time tSS ≈ (2.5V × CSS) / 5μA. A 100nF capacitor yields ~50ms soft-start, limiting inrush current and preventing input rail collapse during power-up.
Is MP3425DL-LF-Z RoHS and lead-free compliant?
Yes - the "LF" suffix in MP3425DL-LF-Z indicates lead-free, halogen-free, and RoHS-compliant packaging per EU Directive 2011/65/EU. MPS confirms green status on its Quality Assurance webpage, and the device meets JEDEC J-STD-020 moisture sensitivity level MSL3.
MP3425DL-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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.1V
- Voltage - Input (Max):
- 22V
- Voltage - Output (Min/Fixed):
- 3.1V
- Voltage - Output (Max):
- 55V (Switch)
- Current - Output:
- 3A (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)
MP3425DL-LF-Z FAQ
1.How can I place an order for MP3425DL-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3425DL-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 MP3425DL-LF-Z reliable?
The price and inventory of MP3425DL-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 MP3425DL-LF-Z is usually 5 days.
3.What payment methods are accepted for MP3425DL-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3425DL-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3425DL-LF-Z?
MP3425DL-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3425DL-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 MP3425DL-LF-Z?
For technical support, including MP3425DL-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3425DL-LF-Z requirements.
6.How does Aetrix verify that MP3425DL-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP3425DL-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 MP3425DL-LF-Z meets industry standards.
7.What is the process for return or replacement of MP3425DL-LF-Z?
All MP3425DL-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3425DL-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 MP3425DL-LF-Z part is unused and in its original packaging.
Return procedure for MP3425DL-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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