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Monolithic Power Systems Inc. MP28128DQ-LF-Z
- Part No.:
- MP28128DQ-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP28128DQ-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 2.5A 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,601
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Product details
Overview
MP28128DQ-LF-Z from Monolithic Power Systems is a 1.5MHz fixed-frequency synchronous step-down DC/DC converter delivering up to 2.5A output current, operating from 2.7V–6V input and regulating adjustable output voltages from 0.8V to 0.9×VIN. It integrates 80mΩ high-side and 60mΩ low-side MOSFETs, features internal compensation, power good (POK), frequency synchronization input, and thermal shutdown-used in FPGA core supplies and point-of-load regulation.
For engineers reviewing the MP28128DQ-LF-Z datasheet, MP28128DQ-LF-Z pinout, MP28128DQ-LF-Z application, or MP28128DQ-LF-Z equivalent, key selection criteria include its 1.5MHz switching frequency, ±10% POK window, 120µs internal soft-start, hiccup-mode short-circuit protection, and QFN10 (3mm × 3mm) package with exposed thermal pad.
Technical Context
The MP28128DQ-LF-Z employs peak-current-mode PWM control with integrated Type II compensation, eliminating external compensation components while supporting bandwidth tuning via FB resistor selection. Its transconductance gain of 11.25A/V links COMP voltage directly to output current limit.
It supports dual-function EN/SYNC pin operation: logic-level enable/disable (1.6V high threshold, 0.4V low threshold) and external clock synchronization (1–2MHz). The bootstrap (BS) circuit enables high-side N-MOSFET drive, and POK provides open-drain status reporting with 30µs deglitch timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2.5A continuous-supports high-current digital loads like ASIC/FPGA cores without external current boosting. |
| Input Voltage Range | 2.7V to 6V-compatible with single-cell Li-ion, USB PD, and 3.3V/5V intermediate bus systems. |
| Switching Frequency | 1.5MHz (±20%)-enables compact magnetics and ceramic output capacitors; synchronizable to 1–2MHz external clock. |
| Feedback Accuracy | ±1.5% at +25°C, ±2.5% over –40°C to +85°C-ensures tight regulation for sensitive logic supplies. |
| Power Good Threshold | ±10% of nominal VOUT-provides reliable system power sequencing and fault detection with 30µs deglitch. |
| Thermal Shutdown | 150°C junction temperature with 20°C hysteresis-prevents permanent damage during sustained overload or poor heatsinking. |
| Soft-Start Time | 120µs internal-controls inrush current and prevents output overshoot during startup. |
Pinout & Package
MP28128DQ-LF-Z is housed in a thermally enhanced 3mm × 3mm, 10-lead QFN package with an exposed thermal pad that must be soldered to a PCB ground plane for optimal thermal performance (θJA = 50°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback Input | Connects to resistive divider; compares output voltage against internal 0.8V reference to regulate VOUT. |
| 2,9 GND / Exposed Pad | Ground Reference & Thermal Path | Primary return path for power and signal; exposed pad must be connected to large copper area for thermal dissipation. |
| 3,8 SW | Switch Node | Connection point for external inductor; carries high di/dt switching waveform; all SW pins must be shorted externally. |
| 4,7 IN | Input Supply | High-current input path requiring local 10–47µF ceramic decoupling; powers internal LDO and gate drivers. |
| 5 BS | Bootstrap Supply | Connects to SW via 0.1µF ceramic capacitor to generate floating gate drive voltage for high-side MOSFET. |
| 6 POK | Open-Drain Power Good | Asserts LOW when VOUT deviates >±10%; requires external pull-up for system monitoring or sequencing logic. |
| 10 EN/SYNC | Enable & Sync Input | Dual-function pin: logic-enable (1.6V/0.4V thresholds) or 1–2MHz sync clock input with automatic mode detection. |
Key Features
| Feature | Design Value |
|---|---|
| All-ceramic capacitor design | Eliminates electrolytic output caps-reduces board area, improves reliability, and avoids ESR-related loop instability. |
| Integrated 80mΩ/60mΩ MOSFETs | Enables >90% efficiency at 2.5A load without external Schottky diode; reduces BOM count and layout complexity. |
| Hiccup-mode short-circuit protection | Shuts down on sustained overload, discharges soft-start cap, then retries-prevents thermal runaway and enables self-recovery. |
| Internal soft-start (120µs) | Prevents input surge and output overshoot during power-up; eliminates need for external RC timing network. |
| Frequency synchronization (1–2MHz) | Allows noise-sensitive systems (e.g., RF, audio) to avoid beat frequencies by locking switching to master clock. |
Applications
| FPGA Core Supply | ASIC I/O Rail |
|---|---|
|
Use Scenario: Powering 1.0V–1.2V core rails of Xilinx Artix-7 or Intel Cyclone V FPGAs under dynamic load transients. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, low-noise core voltage with fast transient response. Use Value: Internal compensation and 1.5MHz switching enable <100ns load-step recovery with minimal output capacitance (47µF ceramic). |
Use Scenario: Generating 1.8V/2.5V I/O supplies for multi-GHz SerDes interfaces in telecom line cards. IC Role / Device Role / Timing Role: Point-of-load regulator synchronized to system clock to suppress switching noise coupling into high-speed data lanes. Use Value: EN/SYNC pin allows precise alignment of switching edges to avoid spectral overlap with 10G/25G NRZ eye diagrams. |
| Network Router PoL | Industrial LCD Display Bias |
|
Use Scenario: Distributed 3.3V supply for packet processing ASICs in enterprise routers with strict thermal constraints. IC Role / Device Role / Timing Role: High-efficiency, thermally robust buck converter mounted near load to minimize IR drop and improve regulation. Use Value: Exposed-pad QFN package achieves θJA = 50°C/W on 1"² 1oz copper-maintains <85°C junction temp at full 2.5A load. |
Use Scenario: Generating stable 5V bias for TFT LCD source drivers in factory automation HMIs. IC Role / Device Role / Timing Role: Immune-to-input-dip regulator maintaining VOUT during brown-out events common in 24V industrial SMPS rails. Use Value: 2.7V UVLO with 210mV hysteresis ensures clean start-up and hold-up through brief 24V rail sags. |
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 |
|---|---|---|---|
| RT6220AGQW | 2.5A, 2MHz, 2.5V–5.5V input, 0.6V–5V output; no POK or sync input; requires external compensation. | Lacks power-good signaling and frequency synchronization-unsuitable for sequenced or noise-sensitive systems. | Choose when cost sensitivity outweighs need for POK/sync and board space allows external compensation network. |
| TPS54227DDAR | 2.5A, 600kHz, 4.5V–18V input, 0.76V–7V output; includes POK and sync; external compensation required. | Lower switching frequency increases inductor size; wider VIN range adds overhead for 3.3V/5V bus designs. | Prefer for higher-input-voltage systems (>6V) where thermal margin permits larger magnetics and slower transient response. |
Compared with RT6220AGQW and TPS54227DDAR, MP28128DQ-LF-Z uniquely combines 1.5MHz operation, internal compensation, POK, and sync in a 3mm × 3mm QFN-delivering smallest footprint and fastest design-in for sub-6V PoL applications.
Availability
MP28128DQ-LF-Z is available at Aetrix Electronics and suitable for FPGA core supplies, ASIC I/O rails, and network router point-of-load regulation requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability.
Supply support for MP28128DQ-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 mixed-signal ICs for power management, motion control, and automotive applications.
The MP28128 belongs to MPS's high-density synchronous buck converter product line, designed specifically for space-constrained, high-efficiency point-of-load regulation in computing, networking, and industrial electronics.
FAQ
What is the minimum recommended output capacitance for stable operation?
The MP28128DQ-LF-Z is optimized for ceramic output capacitors; 47µF (X5R/X7R) is the minimum recommended value for full 2.5A load stability. Lower values may cause excessive ripple or loop instability, especially when using the internal compensation network.
Can the MP28128DQ-LF-Z operate with pre-biased outputs?
Yes-the device supports pre-bias startup: if VOUT is already present at startup, the IC disables both switches until the internal soft-start voltage exceeds the sensed FB voltage, preventing reverse current flow and output collapse.
Is an external Schottky diode required for reliable operation?
No external Schottky diode is required for basic operation, but MPS recommends one (≥0.5A, VR ≥ VIN_MAX) when output current exceeds 2A to reduce SW node voltage spikes and improve efficiency by ~1–2% under heavy load.
How does the EN/SYNC pin distinguish between enable and sync modes?
The IC detects mode automatically: a clean 1–2MHz square wave triggers sync mode; logic-level pulses longer than 4µs (but shorter than 4µs OFF time) trigger enable/disable. If any ON/OFF period exceeds 4µs, it reverts to enable mode.
What is the maximum duty cycle limitation and why does it matter?
The MP28128DQ-LF-Z supports up to 90% duty cycle, limiting the minimum achievable output voltage to 0.9×VIN. This constrains use cases requiring very low VOUT from high VIN (e.g., 12V→1.2V), where a lower-VIN intermediate stage is needed.
Does the POK output require an external pull-up resistor?
Yes-POK is an open-drain output and must be pulled up to a valid logic-high voltage (e.g., VOUT or system rail) with a 10kΩ resistor to ensure proper HIGH/LOW state reporting for power sequencing controllers or microcontrollers.
What is the thermal pad soldering requirement for reliable operation?
The exposed thermal pad must be soldered to a solid GND copper pour covering ≥80% of the pad area, with ≥4 thermal vias (0.3mm diameter) connecting to inner-layer GND planes-failure to do so risks thermal shutdown above 1.8A continuous load.
MP28128DQ-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 10-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):
- 2.7V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.4V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-QFN (3x3)
MP28128DQ-LF-Z FAQ
1.How can I place an order for MP28128DQ-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP28128DQ-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 MP28128DQ-LF-Z reliable?
The price and inventory of MP28128DQ-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 MP28128DQ-LF-Z is usually 5 days.
3.What payment methods are accepted for MP28128DQ-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP28128DQ-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP28128DQ-LF-Z?
MP28128DQ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP28128DQ-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 MP28128DQ-LF-Z?
For technical support, including MP28128DQ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP28128DQ-LF-Z requirements.
6.How does Aetrix verify that MP28128DQ-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP28128DQ-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 MP28128DQ-LF-Z meets industry standards.
7.What is the process for return or replacement of MP28128DQ-LF-Z?
All MP28128DQ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP28128DQ-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 MP28128DQ-LF-Z part is unused and in its original packaging.
Return procedure for MP28128DQ-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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