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Monolithic Power Systems Inc. MP28255EL-LF-P
- Part No.:
- MP28255EL-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 14-VFDFN Exposed Pad
- Datasheet:
-
MP28255EL-LF-P.pdf
- Description:
- IC REG BUCK ADJ 4A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,145
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Product details
Overview
MP28255EL-LF-P from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated 120mΩ high-side and 20mΩ low-side MOSFETs, delivering 4A continuous output current across a 4.5V–21V input range. It operates at a fixed 500kHz switching frequency with internal compensation, external soft-start, and power-good indication-designed for compact, high-efficiency point-of-load regulation in space-constrained networking and display power systems.
For engineers reviewing the MP28255EL-LF-P datasheet, MP28255EL-LF-P pinout, MP28255EL-LF-P application, or MP28255EL-LF-P equivalent, key selection considerations include its 14-pin QFN3x4 package thermal performance (θJA = 48°C/W), 0.8V adjustable output voltage, hiccup-mode over-current protection, and sync capability from 300kHz to 2MHz.
Technical Context
The MP28255EL-LF-P uses peak-current-mode control with an internal 5V bias regulator powered from VIN, enabling stable operation down to 4.5V input. Its proprietary switching loss reduction technique and integrated bootstrap diode support efficient high-duty-cycle operation up to 90%.
Feedback is referenced to a precision 805mV (±1.5%) bandgap voltage, with dedicated AGND and GND pins for noise isolation. The EN/SYNC pin serves dual function: digital enable control with 1.3V threshold and external clock synchronization, while the open-drain PG pin asserts after VOUT reaches 90% of regulation and de-asserts at 70%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 21V - supports wide industrial and telecom input rails without pre-regulation |
| Output Current | 4A continuous - sufficient for FPGA core, SoC I/O, or ASIC auxiliary rail power delivery |
| Switching Frequency | Fixed 500kHz (±15%) - balances size (small inductor/capacitor) and efficiency in mid-power apps |
| Feedback Voltage | 805mV ±1.5% - enables precise 0.8V–21V output adjustment with standard resistor dividers |
| Current Limit | 5.6A typical - provides robust short-circuit protection with hiccup recovery to limit thermal stress |
| Thermal Shutdown | 150°C activation - protects die integrity during sustained overload or poor PCB heatsinking |
| Soft-Start Time | 2–6.5ms (with 47nF SS capacitor) - prevents inrush current and output overshoot at startup |
Pinout & Package
MP28255EL-LF-P is housed in a thermally enhanced 3mm × 4mm, 14-pin QFN package with exposed thermal pad (recommended to connect to PCB ground plane). Pin 1 is marked by a dot; the exposed pad is not internally connected but critical for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Primary input supply connection | Accepts 4.5V–21V; requires local 22μF ceramic decoupling and low-impedance PCB routing |
| 2,3,4,5 SW | Switch node | High-frequency drain connection of internal HS-FET; must use wide copper and multiple vias to minimize loop inductance |
| 6 BST | Bootstrap supply | Connects to SW via 0.1–1μF capacitor to generate floating gate drive for HS-FET; internal diode eliminates need for external BST diode in most cases |
| 7 EN/SYNC | Enable and clock synchronization input | Digital enable (1.3V threshold) or 300kHz–2MHz external clock input; internal 1MΩ pull-down allows float-to-disable |
| 8 FB | Feedback input | Compares output voltage divider ratio against 805mV reference; sensitive analog node requiring short, shielded trace routing |
| 9 PG | Power good open-drain output | Asserts high-Z when VOUT ≥ 90% of target; pulls low when VOUT ≤ 70%; drives external supervisor or sequencer |
| 10,11 SS, VCC | Soft-start control and internal bias supply | SS sets ramp time with external capacitor; VCC is internally regulated 5V rail (0.1–0.22μF decoupling required) |
| 12,13 GND, AGND | Power and signal ground references | GND is power return path; AGND is isolated analog reference - must be joined externally on PCB, not internally |
| 14 Exposed Pad | Thermal and mechanical anchor | No electrical connection; soldered to solid GND plane for θJA = 48°C/W and long-term reliability |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 120mΩ HS + 20mΩ LS MOSFETs - eliminates external FETs and drivers, reducing BOM count and layout complexity |
| Internal Compensation | Single-pole-zero network - removes need for external compensation components, accelerating design cycle |
| Sync Capability | 300kHz–2MHz external clock acceptance - enables EMI reduction via frequency dithering or system-level clock alignment |
| Hiccup Over-Current Protection | Auto-retry shutdown on sustained overload - limits average fault current to ~1A, preventing thermal runaway during output short |
| Proprietary Switching Loss Reduction | Optimized gate drive timing and charge recycling - improves full-load efficiency by 2–3% vs. conventional synchronous buck controllers |
Applications
| Networking Systems | Digital Set Top Boxes |
|---|---|
|
Use Scenario: Powering 12V-to-1.2V core rails for multi-core SoCs in enterprise switches and routers. IC Role / Device Role / Timing Role: Primary point-of-load regulator with fast transient response to handle bursty packet-processing loads. Use Value: 4A continuous output and 500kHz switching enable small 2.2μH inductors and <100mm² total solution size per rail. |
Use Scenario: Generating 3.3V and 1.8V rails for video decoder ICs and HDMI interface circuitry. IC Role / Device Role / Timing Role: Secondary buck converter synchronized to system master clock to suppress conducted EMI in audio/video subsystems. Use Value: Sync input allows deterministic switching edge alignment, reducing spectral peaks in FCC/CE radiated emissions testing. |
| Flat Panel Television | Distributed Power Systems |
|
Use Scenario: Supplying 5V and 12V logic rails for TCON (timing controller) and backlight driver ICs in LCD/LED panels. IC Role / Device Role / Timing Role: High-reliability main converter with thermal shutdown and hiccup protection for unattended operation. Use Value: 150°C thermal shutdown and -20°C to +85°C operating range ensure stable performance in enclosed, thermally stressed enclosures. |
Use Scenario: Local regulation of intermediate bus voltages (e.g., 12V → 3.3V) in modular server PSUs and telecom rectifiers. IC Role / Device Role / Timing Role: Compact, self-contained buck stage supporting hot-swap and sequencing requirements in distributed architectures. Use Value: PG pin provides real-time output health status to upstream PMBus controllers, enabling predictive maintenance and fault logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP28164DD-LF-Z | Lower 3A rating, 2.5V–18V input, no SYNC pin, smaller 2mm×2mm QFN8 | Suitable only for sub-3A loads; lacks frequency synchronization for EMI-sensitive designs | Select when board space is critical and 3A output suffices; avoid if system-level clock alignment is required |
| RT7295BGJ8F | 4A rating, 4.5V–18V input, 600kHz fixed frequency, external compensation required | Requires additional RC network for loop stability; higher quiescent current (1.2mA vs. 0.7mA) | Prefer when custom loop tuning is needed; MP28255EL-LF-P offers faster time-to-market with internal compensation |
Compared with MP28255EL-LF-P, MP28164DD-LF-Z trades output current and sync capability for footprint reduction, while RT7295BGJ8F sacrifices integration (external compensation) for marginally higher switching frequency-making MP28255EL-LF-P optimal for balanced performance, size, and design simplicity in 4A PoL applications.
Availability
MP28255EL-LF-P is available at Aetrix Electronics and suitable for networking systems, flat panel displays, digital set-top boxes, and distributed power systems requiring stable component supply, RoHS-compliant packaging, and long-lifecycle availability.
Supply support for MP28255EL-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP28255 belongs to MPS's high-density synchronous buck converter product line, engineered for compact, high-efficiency DC/DC conversion in space- and thermally constrained consumer, computing, and communications equipment.
FAQ
What is the minimum recommended input capacitance for MP28255EL-LF-P?
The datasheet specifies a 22μF X5R/X7R ceramic capacitor at the IN pin as the minimum for stable operation. This value ensures adequate RMS current handling (≥2A) and low impedance at 500kHz. For 21V max input, use a 25V-rated part; place it within 3mm of the IN and GND pins with wide, low-inductance traces.
Can MP28255EL-LF-P operate with an output voltage below 0.8V?
No. The internal feedback reference is fixed at 805mV ±1.5%, and the device is not designed for sub-0.8V regulation. Attempting to set VOUT lower using external resistive dividers violates the guaranteed operating conditions and may cause instability or failure to regulate due to comparator saturation.
How does the hiccup-mode over-current protection behave during a sustained short circuit?
When FB drops below 70% of the target voltage (e.g., <560mV for a 0.8V output), the device enters hiccup mode: it shuts down for ~10ms, then attempts restart. This cycle repeats, limiting average short-circuit current to ~1A and die temperature to <125°C-preventing permanent damage without requiring external current-limit circuitry.
Is an external bootstrap diode required for reliable operation?
No. MP28255EL-LF-P integrates a bootstrap diode. An external diode (e.g., IN4148) is optional and only beneficial when duty cycle exceeds 65% (VIN > 3×VOUT), where internal diode conduction losses increase. For typical 12V→1.2V or 5V→3.3V conversions, the internal diode delivers full rated efficiency.
What is the purpose of separating AGND and GND pins?
AGND is the quiet analog reference for the error amplifier and feedback comparator; GND carries high di/dt switch-node return current. Separating them prevents noise coupling into the feedback path. They must be joined at a single point near the IC's exposed pad-never left floating or connected through narrow traces-to maintain regulation accuracy and stability.
Does MP28255EL-LF-P support forced PWM mode at light load?
No. The device operates exclusively in peak-current-mode PWM and does not feature pulse-skipping or forced continuous conduction mode (FCCM). At light loads (<100mA), efficiency drops due to fixed switching losses, but regulation remains stable. For ultra-low-Iq applications, consider MPS's MP2451 or MPQ442X families.
MP28255EL-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:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 21V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 4A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-QFN (3x4)
MP28255EL-LF-P FAQ
1.How can I place an order for MP28255EL-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP28255EL-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 MP28255EL-LF-P reliable?
The price and inventory of MP28255EL-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 MP28255EL-LF-P is usually 5 days.
3.What payment methods are accepted for MP28255EL-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP28255EL-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP28255EL-LF-P?
MP28255EL-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP28255EL-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 MP28255EL-LF-P?
For technical support, including MP28255EL-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP28255EL-LF-P requirements.
6.How does Aetrix verify that MP28255EL-LF-P is sourced from the original manufacturer or authorized distributors?
All MP28255EL-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 MP28255EL-LF-P meets industry standards.
7.What is the process for return or replacement of MP28255EL-LF-P?
All MP28255EL-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP28255EL-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 MP28255EL-LF-P part is unused and in its original packaging.
Return procedure for MP28255EL-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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