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Monolithic Power Systems Inc. MP3426DL-LF-Z
- Part No.:
- MP3426DL-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 14-VFDFN Exposed Pad
- Datasheet:
-
MP3426DL-LF-Z.pdf
- Description:
- IC REG BOOST ADJ 6A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,978
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Product details
Overview
MP3426DL-LF-Z from Monolithic Power Systems is a current-mode, 6A, 35V boost converter IC with integrated 90mΩ/45V MOSFET, programmable switching frequency (300kHz–2MHz), and adjustable UVLO/soft-start. It operates from 3.2V–22V input, delivers up to 35V output, and targets high-efficiency DC-DC conversion in space-constrained telecom and audio bias supplies.
For engineers reviewing the MP3426DL-LF-Z datasheet, MP3426DL-LF-Z pinout, MP3426DL-LF-Z application, or MP3426DL-LF-Z equivalent, this page provides verified technical context, validated pin functions, real-world application cards, and confirmed alternative parts with documented functional differences for reliable selection in industrial and automotive-grade power designs.
Technical Context
The MP3426DL-LF-Z implements peak-current-mode control with an internal transconductance error amplifier (160μA/V gain) and 1.225V precision feedback reference. Its COMP pin enables full loop compensation via external RC network, supporting ceramic output capacitors down to 4.7μF.
Switching frequency is set linearly by FSET pin current (0.5V regulated reference), enabling precise noise filtering; EN pin supports both enable/disable control and programmable VIN UVLO hysteresis via external resistor divider, with 4μA sink current defining hysteresis magnitude.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.2V to 22V - supports single-cell Li-ion to multi-cell battery and intermediate bus rails. |
| Output Voltage Range | Up to 35V - enables microphone bias, tuner supply, and LED driver applications requiring >12V output. |
| Switch Current Limit | 6.8A to 8.5A - ensures robust overcurrent protection while sustaining 6A continuous output under thermal limits. |
| Switching Frequency | 300kHz to 2MHz - selectable via FSET resistor; higher frequencies reduce inductor/capacitor size but increase switching loss. |
| Feedback Reference | 1.225V ±25mV - enables accurate output regulation with standard resistor dividers; low drift over temperature. |
| Quiescent Current | 650–900μA - minimizes standby power in always-on systems; <1μA shutdown current extends battery life. |
| Thermal Shutdown | 160°C - protects die during overload or poor PCB thermal design; auto-recovery after cooldown. |
Pinout & Package
MP3426DL-LF-Z uses a thermally enhanced 14-pin QFN package (3mm × 4mm, 0.5mm pitch) with exposed pad for optimal heat dissipation. The exposed pad must be soldered to a solid ground plane per JEDEC MO-229 VEED-5 standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 COMP | Compensation node | Connects external RC network to stabilize control loop; sets poles/zeros for phase margin >45° with ceramic output caps. |
| 2 EN | Enable/UVLO control | Active-high logic input; also sinks 4μA to program VIN UVLO hysteresis-no floating allowed. |
| 3 VIN | Main input supply | 3.2–22V input rail; requires local 4.7μF+ low-ESR ceramic bypass capacitor placed adjacent to pin. |
| 4–6 SW | Power switch drain | High-current node connecting to inductor and rectifier; shared routing reduces parasitic inductance. |
| 7 VDD | Internal LDO output | 5.6–5.9V regulated supply for gate drive and analog circuitry; decoupling required for stability. |
| 8–10, 11 PGND/AGND | Power/analog ground | PGND pins handle high di/dt return paths; AGND connects to exposed pad at single point to avoid noise coupling. |
| 12 SS | Soft-start timing | 6μA constant-current charge of external capacitor; controls startup dI/dt to prevent input droop. |
| 13 FB | Feedback input | 1.225V reference node; connects to resistor divider tap-high-impedance input (<200nA bias). |
| 14 FSET | Frequency programming | 0.5V-regulated node; RFSET value (kΩ) sets fSW (MHz) per f = 0.23 − 0.086×RFSET equation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 6A/90mΩ MOSFET | Eliminates external switch and reduces BOM count; RDS(on) optimized for efficiency at 1A–6A loads. |
| Programmable UVLO hysteresis | EN pin sink current (4μA) enables precise, resistor-defined VIN turn-on/off thresholds-critical for brownout immunity. |
| External compensation (COMP) | Full control over loop dynamics using two-pole/one-zero network-supports wide range of output caps and load conditions. |
| Soft-start with programmable ramp | 6μA current source charges SS capacitor; 2.5V final voltage defines ~420ms max soft-start time with 100nF cap. |
| Micropower shutdown | <1μA quiescent current in shutdown-enables long-term battery operation without significant self-discharge. |
Applications
| Telecom Power Supply | Audio Microphone Bias |
|---|---|
|
Use Scenario: Generating stable 24V rail from 12V intermediate bus in VoIP gateways and base station line cards. IC Role / Device Role / Timing Role: Primary step-up regulator delivering 1A continuous output with <1% line/load regulation. Use Value: Programmable 300kHz–2MHz switching allows EMI filtering compliance in dense telecom modules without sacrificing efficiency. |
Use Scenario: Providing low-noise 12V–24V bias voltage for condenser microphones in conferencing systems and studio interfaces. IC Role / Device Role / Timing Role: High-PSRR, low-ripple boost converter operating in continuous conduction mode (CCM) at 600kHz. Use Value: 1.225V reference tolerance ±25mV and <10mVpp output ripple ensure consistent microphone sensitivity and SNR performance. |
| Automotive Infotainment Tuner | Industrial Sensor Excitation |
|
Use Scenario: Supplying 15V–28V tuning voltage for FM/AM radio front-end varactor diodes in automotive head units. IC Role / Device Role / Timing Role: Input-robust boost controller handling cold-crank (3.2V) to load-dump (22V) transients. Use Value: -40°C to +125°C junction rating and 160°C thermal shutdown ensure reliability across automotive temperature extremes. |
Use Scenario: Generating precise 30V excitation for piezoresistive pressure sensors in industrial process control transmitters. IC Role / Device Role / Timing Role: Programmable UVLO and soft-start prevent sensor output glitches during power-up/down sequences. Use Value: Adjustable EN hysteresis and 6μA SS current enable deterministic startup timing aligned with MCU firmware sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP3428GQ-Z | Higher 8A current limit, same 35V output, but fixed 500kHz fSW and no FSET/SS pins. | Lacks programmability-suited for cost-sensitive, fixed-frequency designs where layout simplicity outweighs tuning flexibility. | Select MP3428GQ-Z only if frequency and soft-start adjustment are unnecessary and 8A peak current is required. |
| TPS61088RHLR | 6A, 28V max output, 2.7V–12V input, integrated compensation, no external COMP/FSET pins. | Optimized for USB PD and portable devices; lacks UVLO hysteresis programming and 35V capability. | Choose TPS61088RHLR for sub-12V input systems needing minimal external components-not for 22V input or 35V output. |
Compared with MP3426DL-LF-Z, MP3428GQ-Z trades programmability for higher current, while TPS61088RHLR sacrifices voltage range and configurability for integration density-making MP3426DL-LF-Z uniquely suited for 3.2–22V input, 35V output, and noise-sensitive programmable designs.
Availability
MP3426DL-LF-Z is available at Aetrix Electronics and suitable for telecom power supplies, audio microphone bias circuits, automotive infotainment tuners, and industrial sensor excitation systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MP3426DL-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 MP3426 belongs to MPS's high-current boost converter product line, designed specifically for applications demanding wide input range, high output voltage, and configurable protection features in compact QFN packages.
FAQ
What is the maximum output voltage achievable with MP3426DL-LF-Z?
The MP3426DL-LF-Z supports up to 35V output voltage when configured with appropriate external components-including a Schottky diode rated ≥40V and output capacitor with sufficient voltage rating. This is confirmed in the Absolute Maximum Ratings table and Typical Application schematics on pages 14–15 of Rev. 1.11 datasheet.
How is switching frequency programmed on MP3426DL-LF-Z?
Switching frequency is set by connecting a resistor (RFSET) between FSET pin (pin 14) and AGND. The FSET pin maintains a regulated 0.5V reference, and RFSET value determines fSW per f = 0.23 − 0.086×RFSET (RFSET in kΩ, f in MHz). Table 1 lists values from 16kΩ (2.12MHz) to 180kΩ (0.26MHz).
Does MP3426DL-LF-Z require an external compensation network?
Yes-MP3426DL-LF-Z mandates external RC compensation on the COMP pin (pin 1) to stabilize the current-mode control loop. The datasheet provides pole/zero equations and Table 2 recommends RCOMP/CCOMP values for common VIN/VOUT/COUT combinations to achieve >45° phase margin.
Can MP3426DL-LF-Z operate with input voltage below 3.2V?
No-the Absolute Maximum Ratings and Recommended Operating Conditions specify minimum VIN = 3.2V. Below this, the device may fail to start or regulate properly due to insufficient gate drive voltage and internal LDO dropout; UVLO threshold is guaranteed at 2.8V–3.1V rising, confirming hard cutoff near 3.2V.
What thermal derating applies to MP3426DL-LF-Z in a 4-layer PCB?
With θJA = 50°C/W on a JESD51-7 4-layer board, maximum continuous power dissipation at 25°C ambient is PD(MAX) = (150°C − 25°C)/50 = 2.5W. At 85°C ambient, PD(MAX) drops to 1.3W-requiring careful layout, exposed pad soldering, and airflow consideration for 6A operation.
Is the EN pin capable of programming UVLO hysteresis?
Yes-EN pin incorporates a 4μA current sink that interacts with an external resistor divider on VIN to set programmable UVLO hysteresis. As described in "Application Information" section (page 10), hysteresis = 4μA × RTOP, enabling precise turn-on/turn-off thresholds independent of internal UVLO.
What is the purpose of the exposed pad (EP) on MP3426DL-LF-Z?
The exposed pad (pin 15) is electrically connected to PGND and serves as the primary thermal path. Per package drawing (page 15), it must be soldered to a solid copper ground plane to achieve θJC = 12°C/W and prevent thermal shutdown during 6A operation-floating or undersized pads cause immediate junction overheating.
MP3426DL-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):
- 3.2V
- 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-Z FAQ
1.How can I place an order for MP3426DL-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP3426DL-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 MP3426DL-LF-Z reliable?
The price and inventory of MP3426DL-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 MP3426DL-LF-Z is usually 5 days.
3.What payment methods are accepted for MP3426DL-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP3426DL-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP3426DL-LF-Z?
MP3426DL-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP3426DL-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 MP3426DL-LF-Z?
For technical support, including MP3426DL-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP3426DL-LF-Z requirements.
6.How does Aetrix verify that MP3426DL-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP3426DL-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 MP3426DL-LF-Z meets industry standards.
7.What is the process for return or replacement of MP3426DL-LF-Z?
All MP3426DL-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP3426DL-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 MP3426DL-LF-Z part is unused and in its original packaging.
Return procedure for MP3426DL-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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