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Monolithic Power Systems Inc. MP28258DD-LF-Z
- Part No.:
- MP28258DD-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 12-TFQFN Exposed Pad
- Datasheet:
-
MP28258DD-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 3A 12QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,161
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Product details
Overview
MP28258DD-LF-Z from Monolithic Power Systems is a fully integrated, synchronous step-down DC/DC converter delivering 3A continuous output current with 4.2V–20V input range, 0.815V–13V adjustable output, and Constant-On-Time (COT) control for fast transient response in networking and distributed power systems.
For engineers reviewing the MP28258DD-LF-Z datasheet, MP28258DD-LF-Z pinout, MP28258DD-LF-Z application, or MP28258DD-LF-Z equivalent, key selection criteria include its QFN12 (2×3mm) package, latch-off OCP mode, integrated 120mΩ/50mΩ MOSFETs, power-good indicator, and thermal shutdown at 150°C with 25°C hysteresis.
Technical Context
The MP28258DD-LF-Z employs Constant-On-Time (COT) control architecture with feed-forward input voltage sensing to maintain stable switching frequency across input voltage variations, enabling rapid load transient recovery without external compensation.
It integrates high-side and low-side MOSFETs with RDS(ON) of 120mΩ and 50mΩ respectively, uses bootstrap gate drive for the high-side switch, and features programmable switching frequency via external resistor on the FREQ pin with typical values from 400kHz to 900kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 20V - supports wide industrial and telecom input rails including 5V, 12V, and 19V systems. |
| Output Current | 3A continuous - sufficient for powering FPGA I/O banks, ASIC cores, or multi-rail point-of-load applications. |
| Output Voltage Range | 0.815V to 13V - adjustable via external resistor divider; enables direct regulation of DDR memory, DSPs, and microcontrollers. |
| Switching Frequency | Programmable up to ~900kHz - allows optimization of size vs. efficiency using small 2.2µH inductors and ceramic output capacitors. |
| Feedback Reference Voltage | 815mV ±12mV - tight tolerance enables accurate output regulation under varying load and temperature conditions. |
| Thermal Shutdown Threshold | 150°C with 25°C hysteresis - ensures reliable overtemperature protection and automatic recovery without system reset. |
| OCP Mode | Latch-off - shuts down permanently on sustained overcurrent until EN cycle; suited for fault-isolation-critical systems. |
Pinout & Package
MP28258DD-LF-Z is housed in a thermally enhanced QFN12 package (2mm × 3mm, 0.5mm pitch) with exposed thermal pad (Pin 2, 10, and 12 are GND; Pin 2, 10 also serve as SW terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11, 12 | GND | System ground reference for output regulation and thermal conduction path; requires low-impedance PCB plane connection. |
| 2, 10 | SW | Switch node connecting internal HS/LS MOSFETs; must use wide copper traces and multiple vias to minimize parasitic inductance. |
| 3 | BST | Bootstrap supply for high-side gate driver; requires 0.1µF ceramic capacitor between BST and SW for proper floating bias generation. |
| 4 | VCC | Internal LDO bias supply; requires 4.7µF ceramic decoupling capacitor placed adjacent to pin for stable gate drive. |
| 5 | EN | Enable input with 1.05–1.6V rising threshold; supports automatic startup via pull-up to VIN or precise sequencing control. |
| 6 | PG | Open-drain power-good signal; asserts high after 0.5ms delay when VFB ≥ 90% of reference, enabling system power sequencing. |
| 7 | FB | Resistor-divider feedback input; sets output voltage with 815mV reference; sensitive to noise-requires short trace routing. |
| 8 | FREQ | Frequency programming pin; connects to VIN via resistor (e.g., 300kΩ → 500kHz); includes 1nF decoupling for noise immunity. |
| 9 | IN | Main input supply rail; accepts 4.2V–20V; requires local 10µF ceramic input capacitor with low ESL near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | HS/LS MOSFETs with 120mΩ/50mΩ RDS(ON) reduce conduction loss and eliminate external switch selection. |
| Constant-On-Time Control | Enables sub-10µs load transient response without loop compensation components-ideal for dynamic FPGA/DSP loads. |
| Power-Good Indicator | Open-drain PG pin provides system-level power sequencing confirmation with 0.5ms delay and 90%/85% VREF thresholds. |
| Soft Start/Shutdown | Fixed 1ms soft-start ramp prevents inrush current; controlled shutdown discharges SS capacitor for monotonic VOUT decay. |
| Comprehensive Protection | Includes latch-off OCP, SCP, UVP (3.1V UVLO), OVP (125% VREF), and thermal shutdown with hysteresis. |
Applications
| Networking Equipment | Distributed Power Systems |
|---|---|
|
Use Scenario: Regulating 1.2V core supply for Ethernet PHY ICs in 10GBase-T switches with bursty traffic-induced load transients. IC Role / Device Role / Timing Role: Primary point-of-load regulator with COT control ensuring <5µs recovery from 0–3A step load. Use Value: Eliminates need for external compensation network and reduces BOM count by integrating both MOSFETs and PG indicator. |
Use Scenario: Generating 3.3V auxiliary rail from 12V backplane in modular server power distribution units. IC Role / Device Role / Timing Role: Secondary buck converter operating in CCM with programmable 600kHz switching for EMI filtering. Use Value: QFN12 (2×3mm) footprint saves board space versus discrete solutions while maintaining 92% peak efficiency at 2A. |
| Industrial PLC I/O Modules | Telecom Line Cards |
|
Use Scenario: Providing isolated 5V supply for digital isolators and ADC drivers in harsh industrial environments with wide input variation. IC Role / Device Role / Timing Role: Input-flexible buck converter with 4.2V–20V range and robust UVLO (3.1V) for brownout resilience. Use Value: Integrated latch-off OCP prevents latch-up during field wiring faults, simplifying safety certification. |
Use Scenario: Powering 1.8V DDR3 memory subsystems on carrier-grade line cards where thermal density and reliability are critical. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with thermal shutdown (150°C) and exposed-pad thermal dissipation. Use Value: Exposed GND pads (Pins 1/11/12 + EP) enable ≤70°C/W θJA, supporting continuous 3A operation in confined airflow zones. |
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 |
|---|---|---|---|
| MP2330H | Successor device with improved efficiency (up to 95%), lower quiescent current (250μA), and extended 4.5V–36V input range. | Designed for new designs requiring higher VIN margin and lower standby power; not pin-compatible with MP28258DD-LF-Z. | Select MP2330H for green-field designs needing longer product lifecycle support and wider input capability. |
| RT7295BGJ6F | 6A-rated buck with similar 4.5V–24V input, but uses current-mode control and lacks integrated PG pin. | Requires external power-good circuitry and additional compensation components; better suited for higher-current legacy systems. | Choose RT7295BGJ6F only if 6A output capability is required and PG functionality can be implemented externally. |
Compared with MP28258DD-LF-Z, MP2330H offers higher input voltage headroom and lower IQ but mandates PCB redesign, while RT7295BGJ6F delivers double the current at the cost of added complexity and no native power-good signaling.
Availability
MP28258DD-LF-Z is available at Aetrix Electronics and suitable for networking equipment, distributed power systems, and industrial PLC I/O modules requiring stable component supply and long-term obsolescence management.
Supply support for MP28258DD-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 design centers in the US, China, and Taiwan.
The MP28258 belongs to MPS's high-efficiency DC/DC converter product line, engineered for compact, fast-transient point-of-load regulation in space-constrained telecom and industrial applications.
FAQ
What is the recommended input capacitor configuration for MP28258DD-LF-Z?
Use a minimum 10µF X5R/X7R ceramic capacitor placed directly at the IN pin with low-ESL layout. For high ripple current handling, add parallel 1µF and 0.1µF ceramics. Avoid electrolytics due to ESR-related instability in COT control mode.
Does MP28258DD-LF-Z support external synchronization?
No. MP28258DD-LF-Z uses internally generated Constant-On-Time control and does not accept external clock signals. Frequency is set solely by the resistor on the FREQ pin and input voltage, with typical variation ±10% across temperature and VIN.
How is the power-good (PG) signal asserted and what load can it drive?
PG is an open-drain output pulled low during startup and fault conditions. It goes high after 0.5ms when FB reaches ≥90% of 815mV. It can sink ≥4mA at 0.4V and requires an external pull-up resistor (typically 10–100kΩ) to VCC or system rail.
Can MP28258DD-LF-Z operate with ceramic output capacitors only?
Yes, but external ramp compensation (R4/C4) is required on the FB pin to ensure stability in PWM mode. Without it, low-ESR ceramics cause subharmonic oscillation. The ramp slope must satisfy equation (9) in the datasheet for stable operation.
What is the thermal performance of MP28258DD-LF-Z in a standard 4-layer PCB?
On a JEDEC-standard 4-layer board (2oz Cu, 1in² thermal pad), θJA is 70°C/W and θJC is 15°C/W. At 3A/12V input/1.2V output, junction temperature rise is ~105°C above ambient, staying within 125°C limit at TA ≤ 40°C with no airflow.
Is MP28258DD-LF-Z RoHS compliant and lead-free?
Yes. The "-LF" suffix denotes lead-free, RoHS-compliant packaging. All solderable surfaces meet JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) and are compatible with standard reflow profiles.
Why is MP28258DD-LF-Z marked "Not Recommended for New Designs"?
MPS has designated MP28258 as NRND because the MP2330H offers superior specs (higher VIN, lower IQ, better efficiency) and active long-term support. MP28258DD-LF-Z remains available for existing designs and legacy production, with full datasheet and application support maintained.
MP28258DD-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 12-TFQFN 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):
- 4.2V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 0.815V
- Voltage - Output (Max):
- 13V
- Current - Output:
- 3A
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-QFN (2x3)
MP28258DD-LF-Z FAQ
1.How can I place an order for MP28258DD-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP28258DD-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 MP28258DD-LF-Z reliable?
The price and inventory of MP28258DD-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 MP28258DD-LF-Z is usually 5 days.
3.What payment methods are accepted for MP28258DD-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP28258DD-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP28258DD-LF-Z?
MP28258DD-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP28258DD-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 MP28258DD-LF-Z?
For technical support, including MP28258DD-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP28258DD-LF-Z requirements.
6.How does Aetrix verify that MP28258DD-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP28258DD-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 MP28258DD-LF-Z meets industry standards.
7.What is the process for return or replacement of MP28258DD-LF-Z?
All MP28258DD-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP28258DD-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 MP28258DD-LF-Z part is unused and in its original packaging.
Return procedure for MP28258DD-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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