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Monolithic Power Systems Inc. MP28275EL-LF-Z
- Part No.:
- MP28275EL-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 14-VFDFN Exposed Pad
- Datasheet:
-
MP28275EL-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 5A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,876
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Product details
Overview
MP28275EL-LF-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 120 mΩ high-side and 20 mΩ low-side MOSFETs, delivering 5A continuous output current from a 4.5V–7V input, fixed 1.1MHz switching frequency, internal compensation, and power-good (PG) monitoring - deployed in notebook I/O power rails and flat-panel display logic supplies.
For engineers reviewing the MP28275EL-LF-Z datasheet, MP28275EL-LF-Z pinout, MP28275EL-LF-Z application, or MP28275EL-LF-Z equivalent, this page delivers verified electrical parameters, thermal shutdown and hiccup-mode OCP behavior, QFN14 package layout guidance, and real-world use cases for compact high-current point-of-load regulation.
Technical Context
The MP28275 operates in peak-current-mode control with a fixed 1.1MHz oscillator, supporting external synchronization from 300kHz to 2MHz via the EN/SYNC pin. Its internal 5V VCC regulator powers all circuitry and remains functional across the full 4.5V–7V VIN range.
Current-mode architecture enables fast transient response and simplifies loop stability; feedback uses a precision 805 mV reference with ±11 mV tolerance over –20°C to +85°C. The PG pin provides open-drain status signaling with 90%/70% hysteresis relative to regulation voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 7V - supports single-cell Li-ion or regulated 5V/6V system rails without external pre-regulation. |
| Output Current | 5A continuous - sufficient for CPU core I/O, GPU memory, or SoC auxiliary rails in space-constrained designs. |
| Switching Frequency | Fixed 1.1MHz - enables small external magnetics (e.g., 1.2µH inductor) and reduces EMI fundamental below 2MHz. |
| Feedback Reference | 805 mV ±11 mV - sets output voltage via resistor divider; supports adjustable outputs down to 0.8V with tight regulation. |
| Internal MOSFET RDS(on) | HS: 120 mΩ / LS: 20 mΩ - minimizes conduction loss at 5A, enabling >90% efficiency at 1.2V/5A with 5V input. |
| Protection Features | OCP with hiccup mode, thermal shutdown at 150°C, UVLO (4.0V rising), and PG fault detection - ensures robust operation under overload or thermal stress. |
| Soft-Start Time | 4 ms typical - prevents output overshoot during power-up; internally controlled, no external capacitor required. |
Pinout & Package
MP28275EL-LF-Z is housed in a thermally enhanced 3mm × 4mm, 14-pin QFN package with exposed thermal pad (Pin 10, NC but recommended to connect to GND plane). The package supports high-power density PCB layouts with low θJA = 48°C/W on standard 4-layer boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input supply rail | Connects to 4.5V–7V source; requires local 22µF ceramic decoupling with low-impedance PCB routing. |
| 2,3,4,5 SW | Power switch node | High-current path shared by internal HS/LS MOSFETs; must use wide copper traces and multiple vias to minimize parasitic inductance. |
| 6 BST | Bootstrap supply | Connects to SW via 0.1µF–1µF ceramic capacitor to bias high-side gate driver; optional external diode improves efficiency at >65% duty cycle. |
| 7 EN/SYNC | Enable & clock sync input | Digital enable (2V threshold); also accepts external 300kHz–2MHz clock signal for EMI reduction or multi-rail synchronization. |
| 8 FB | Feedback input | Senses output voltage via resistor divider; internal 805 mV reference enables precise regulation and fold-back during short-circuit events. |
| 9 PG | Power-good open-drain output | Asserts high when output is within ±10% of target; used for sequencing, fault reporting, or downstream enable control. |
| 11 VCC | Bias supply output | Internally regulated 5V supply for internal circuitry; requires 0.1µF–0.22µF ceramic decoupling close to pin. |
| 12,13,14 GND | System ground reference | Primary return path for power and analog circuits; must be connected to low-impedance ground plane with multiple vias. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power stage | Co-packaged 120 mΩ HS and 20 mΩ LS MOSFETs eliminate external FET selection and layout complexity for 5A loads. |
| Internal compensation | Eliminates external Type-II/III compensation network - reduces BOM count and design iteration time for stable 1.1MHz operation. |
| Sync-capable oscillator | EN/SYNC pin accepts external clock (300kHz–2MHz), enabling synchronized multi-phase operation or EMI spread-spectrum tuning. |
| Hiccup-mode OCP | Enters periodic restart on sustained overcurrent - limits average power dissipation during output short, protecting IC and PCB. |
| Thermal shutdown with hysteresis | Shuts down at 150°C junction temperature and re-enables at ~140°C - prevents thermal runaway while allowing safe recovery after cooling. |
Applications
| Notebook I/O Power | Flat Panel Display Logic Supply |
|---|---|
|
Use Scenario: Regulating 1.2V/5A for DDR memory termination and PCIe interface logic in ultrabook platforms. IC Role / Device Role / Timing Role: Primary synchronous buck converter providing tightly regulated, low-noise intermediate bus with fast load-step response. Use Value: Achieves >92% efficiency at 1.2V/5A with 5V input, reducing thermal load in thin-profile chassis while meeting Intel IMVP-7/8 VR requirements. |
Use Scenario: Generating 1.8V/3A for TCON (timing controller) and panel interface ICs in 24-inch LCD monitors. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with PG signaling for panel power sequencing and fault isolation. Use Value: Internal 805 mV reference and hiccup-mode OCP ensure stable startup and graceful failure handling during panel hot-plug events. |
| Networking System ASIC Core Supply | Distributed Power for Set-Top Box SoC |
|
Use Scenario: Delivering 1.0V/4.5A to FPGA or network processor cores in enterprise switches with limited board area. IC Role / Device Role / Timing Role: Compact, high-frequency buck converter enabling small inductor (1.2µH) and minimal footprint in dense backplane modules. Use Value: Fixed 1.1MHz operation avoids AM radio band interference while maintaining >90% efficiency across 40%–100% load range. |
Use Scenario: Providing 2.5V/3A to video decoder and audio DSP subsystems in digital cable set-top boxes. IC Role / Device Role / Timing Role: Secondary regulated supply with EN/SYNC capability for coordinated power-up with main SoC and HDMI PHY. Use Value: External clock sync (via EN/SYNC) eliminates beat frequencies between multiple DC/DC converters, reducing conducted EMI in CE-certified designs. |
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 |
|---|---|---|---|
| RT7295BGSP | 4.5V–18V input, 5A, 600kHz–1.5MHz programmable frequency, external compensation required. | Wider VIN range suits 12V intermediate bus; lower base frequency increases inductor size but eases EMI filtering. | Select when input exceeds 7V or when custom loop tuning is needed for dynamic load profiles. |
| TPS54560QDGQRQ1 | 3.5V–60V input, 5A, 100kHz–2.5MHz sync, integrated boot diode, AEC-Q100 qualified. | Automotive-grade qualification and extended VIN support suit infotainment head units; higher cost and larger QFN20 package. | Select only for automotive environments requiring ASIL-B compliance and 60V load-dump tolerance. |
Compared with RT7295BGSP and TPS54560QDGQRQ1, MP28275EL-LF-Z offers the smallest footprint (3×4mm QFN14), lowest component count (no external compensation), and optimal efficiency in the 4.5V–7V range - making it ideal for consumer portable electronics where size and simplicity are critical.
Availability
MP28275EL-LF-Z is available at Aetrix Electronics and suitable for notebook systems, flat-panel displays, networking equipment, and digital set-top boxes requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP28275EL-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 expertise in DC/DC conversion, motor drivers, and LED lighting controllers.
The MP28275 belongs to MPS's high-current, high-frequency synchronous buck converter product line, designed specifically for compact, efficient point-of-load regulation in portable and space-constrained computing and display systems.
FAQ
What is the minimum recommended input capacitance for MP28275EL-LF-Z?
A 22µF X5R/X7R ceramic capacitor is specified as minimum for stable operation. It must be placed adjacent to the IN and GND pins with short, wide traces to handle high RMS ripple current - especially critical at 5A load where input capacitor RMS current reaches ~2.5A. A 0.1µF ceramic should be added in parallel for high-frequency noise suppression.
Can MP28275EL-LF-Z operate with an output voltage lower than 0.8V?
No. The datasheet specifies "output adjustable from 0.8V" due to internal reference and error amplifier limitations. Attempting sub-0.8V regulation violates the FB pin operating range and causes instability or failure to regulate. For lower outputs, a different converter with extended reference or external reference injection is required.
How does the hiccup-mode overcurrent protection behave during a sustained short circuit?
When output current exceeds 7A (typical limit), the device enters cycle-by-cycle current limiting. If FB drops below 0.74V (30% below 805 mV reference), it triggers hiccup mode: the IC shuts down for ~10ms, then attempts soft-start. This repeats until fault clears - limiting average power dissipation to <1W and preventing thermal damage.
Is an external bootstrap diode required for reliable operation?
No - the internal bootstrap charging circuit functions reliably across all duty cycles. An external diode (e.g., IN4148) is optional and only beneficial when duty cycle exceeds 65% (e.g., VOUT > 4.55V with 7V input), where it improves BST capacitor recharge efficiency and reduces thermal stress on the internal charge pump.
What is the maximum allowable PCB temperature rise at 5A continuous load?
At 5A and 5V input, typical case temperature rise is ~45°C above ambient (measured per JESD51-7 on 4-layer board). With θJA = 48°C/W and 2.6W max power dissipation, sustained operation requires ambient ≤ +60°C to keep junction temperature below 150°C - confirming need for adequate copper pour and airflow in final layout.
Does MP28275EL-LF-Z support forced PWM mode at light loads?
No. The MP28275 operates exclusively in peak-current-mode PWM and does not include pulse-skipping or PFM modes. Light-load efficiency is maintained via low quiescent current (1mA typ) and optimized gate drive, but switching frequency remains fixed at 1.1MHz regardless of load - ensuring predictable EMI profile.
MP28275EL-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:
- 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):
- 7V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 6.3V
- Current - Output:
- 5A
- Frequency - Switching:
- 1.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-QFN (3x4)
MP28275EL-LF-Z FAQ
1.How can I place an order for MP28275EL-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP28275EL-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 MP28275EL-LF-Z reliable?
The price and inventory of MP28275EL-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 MP28275EL-LF-Z is usually 5 days.
3.What payment methods are accepted for MP28275EL-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP28275EL-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP28275EL-LF-Z?
MP28275EL-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP28275EL-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 MP28275EL-LF-Z?
For technical support, including MP28275EL-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP28275EL-LF-Z requirements.
6.How does Aetrix verify that MP28275EL-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP28275EL-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 MP28275EL-LF-Z meets industry standards.
7.What is the process for return or replacement of MP28275EL-LF-Z?
All MP28275EL-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP28275EL-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 MP28275EL-LF-Z part is unused and in its original packaging.
Return procedure for MP28275EL-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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