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Monolithic Power Systems Inc. MP28490DN-LF-P
- Part No.:
- MP28490DN-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP28490DN-LF-P.pdf
- Description:
- IC REG BUCK ADJ 5A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:4,985
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Product details
Overview
MP28490DN-LF-P from Monolithic Power Systems is a monolithic synchronous step-down DC/DC converter with integrated 50mΩ high-side MOSFET, delivering 5A continuous output current across 4.5V–30V input range and adjustable 0.8V–15V output. It operates at fixed 420kHz (synchronizable to 1.5MHz), features cycle-by-cycle overcurrent protection with hiccup mode, thermal shutdown, and power-good indicator-used in flat-panel TV power rails requiring stable 3.3V/5V conversion.
For engineers reviewing the MP28490DN-LF-P datasheet, MP28490DN-LF-P pinout, MP28490DN-LF-P application, or MP28490DN-LF-P equivalent, key selection criteria include input voltage range compatibility, internal MOSFET RDS(ON), PG functionality, thermal resistance (θJA = 50°C/W), and SOIC8E exposed-pad layout requirements.
Technical Context
The MP28490DN-LF-P employs peak-current-mode control with a fixed 420kHz oscillator and supports external synchronization from 300kHz to 1.5MHz via the EN/SYNC pin. Its error amplifier compares FB voltage against a 0.808V internal reference and drives a COMP node for PWM duty-cycle adjustment.
It integrates a floating high-side gate driver powered by a bootstrap capacitor between SW and BST pins, with internal UVLO (2.2V) on the BST rail. Thermal shutdown triggers at 150°C and recovers at ~140°C; hiccup-mode overcurrent protection activates when FB falls below 0.74V for >100ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 30V - supports wide industrial and consumer DC bus inputs including 12V/24V systems. |
| Output Current | 5A continuous - enables single-chip supply for SoC cores or FPGAs without external pass devices. |
| Switch RDS(ON) | 45mΩ typical - reduces conduction loss and improves efficiency at full load (e.g., >90% at 12V→3.3V/5A). |
| Feedback Reference | 0.808V ±2% - sets precise output regulation via external resistor divider; enables 0.8V–15V adjustability. |
| Power Good Threshold | 0.74V rising, 40mV hysteresis - provides reliable system reset signaling within ±10% of nominal VOUT. |
| Thermal Resistance | θJA = 50°C/W - requires exposed-pad soldering to PCB copper for safe 5A operation at +85°C ambient. |
| Sync Frequency Range | 300kHz to 1.5MHz - allows EMI reduction via spread-spectrum or noise-sensitive frequency alignment. |
Pinout & Package
The MP28490DN-LF-P is housed in an 8-pin SOIC package with thermally enhanced exposed pad (SOIC8E), rated for –40°C to +85°C operation. The exposed pad must be soldered to a PCB thermal plane for effective heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch Node Output | Drives external inductor; connects to bootstrap capacitor and Schottky catch diode anode. |
| 2 BST | Bootstrap Supply | Provides floating gate drive voltage for high-side MOSFET; requires 0.1–1µF ceramic capacitor to SW. |
| 3 VCC | Bias Regulator Input | Internal 5V regulator input; decoupled with 1µF ceramic capacitor to GND for gate driver stability. |
| 4 GND | Analog & Power Ground | Reference for FB, PG, and EN/SYNC; must be routed outside high-di/dt paths to avoid noise coupling. |
| 5 FB | Voltage Feedback Input | Senses output via resistor divider; internal 0.808V reference enables accurate VOUT regulation. |
| 6 PG | Power Good Open-Drain | Pulls low when VOUT < 90% nominal; used for system sequencing or fault indication. |
| 7 EN/SYNC | Enable & Clock Sync | Active-high enable; accepts external 300kHz–1.5MHz clock for EMI control or multi-rail synchronization. |
| 8 IN | Main Input Supply | Accepts 4.5V–30V unregulated input; requires local 22µF X5R/X7R ceramic capacitor for ripple suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 50mΩ High-Side MOSFET | Eliminates need for external switch and associated gate drive circuitry, reducing BOM count and layout area. |
| Power Good (PG) Indicator | Provides system-level monitoring of output regulation status without external comparators or resistors. |
| Hiccup-Mode Overcurrent Protection | Limits average short-circuit current during output faults, preventing thermal runaway and enabling self-recovery. |
| Stable with Low-ESR Ceramic Capacitors | Supports X5R/X7R MLCCs on input/output, avoiding bulk electrolytics and improving reliability and lifetime. |
| Internal Soft-Start | Prevents output overshoot during startup by ramping internal reference from 0V to 1.2V over ~1ms. |
Applications
| Flat Panel Television Power Rails | Digital Set-Top Box Core Supply |
|---|---|
|
Use Scenario: Generating 3.3V/5V rails for video processing SoCs and HDMI interface ICs in 4K TV mainboards. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated core voltage with tight line/load regulation and fast transient response. Use Value: Integrated MOSFET and PG signal simplify power tree design while meeting stringent standby current (<1.1mA quiescent) requirements. |
Use Scenario: Providing 1.2V/1.8V/3.3V supplies to MPEG decoder, tuner, and USB controller in cable/satellite STBs. IC Role / Device Role / Timing Role: Synchronous step-down converter operating at 420kHz to minimize filter size and meet EMI Class B limits. Use Value: Synchronization capability allows coordinated switching with other rails to suppress beat frequencies and reduce conducted emissions. |
| Personal Video Recorder (PVR) Storage Interface | Broadband Gateway Ethernet PHY Supply |
|
Use Scenario: Powering SATA controller and NAND flash interface in DVR/PVR units with variable load profiles. IC Role / Device Role / Timing Role: High-current buck converter supporting dynamic load steps up to 5A with <100µs recovery time. Use Value: Cycle-by-cycle current limiting and hiccup mode protect against HDD short-circuit faults without latch-off behavior. |
Use Scenario: Delivering clean 3.3V to Gigabit Ethernet PHYs in residential gateways and fiber ONTs. IC Role / Device Role / Timing Role: Fixed-frequency buck regulator with low-noise PG output for PHY reset coordination. Use Value: Stable operation with ceramic capacitors ensures low output ripple (<20mVpp) critical for signal integrity in high-speed SerDes links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 3A output, 4.5V–28V input, 500kHz fixed frequency, no PG pin, smaller SOIC8 package without exposed pad. | Lacks power-good signaling and thermal margin for sustained 5A loads; suited for space-constrained 3A designs. | Select when board area is limited and PG is not required; verify θJA = 65°C/W meets thermal budget at target load. |
| RT7295BGJ8F | 5A output, 4.5V–32V input, 600kHz switching, built-in soft-start, but no sync capability and higher RDS(ON) (65mΩ). | Higher conduction loss reduces efficiency at high load; lacks EN/SYNC flexibility for EMI tuning. | Choose if higher switching frequency is needed for smaller magnetics, accepting lower efficiency and no sync option. |
Compared with MP28490DN-LF-P, MP2315DJ-LF-Z trades current capability and thermal performance for compactness, while RT7295BGJ8F offers higher fSW but sacrifices efficiency and EMI control flexibility-making MP28490DN-LF-P optimal for thermally demanding 5A applications requiring PG and sync.
Availability
MP28490DN-LF-P is available at Aetrix Electronics and suitable for flat panel television power rails, digital set-top box core supplies, and broadband gateway Ethernet PHY supplies requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for MP28490DN-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, headquartered in California and serving global industrial, computing, and consumer markets since 1997.
The MP28490 belongs to MPS's high-current integrated buck converter product line, designed specifically for space- and thermally constrained applications needing robust 5A regulation with minimal external components and advanced protection features.
FAQ
What is the minimum recommended input capacitance for MP28490DN-LF-P?
A 22µF X5R or X7R ceramic capacitor is recommended at the IN pin, placed as close as possible to pins 4 (GND) and 8 (IN). This value suppresses high-frequency switching noise and limits surge current; lower values may cause input voltage droop under transient load conditions.
Can MP28490DN-LF-P operate without an external bootstrap diode?
Yes-the internal bootstrap charging circuit functions without an external diode for most output voltages. An external IN4148 diode from VOUT to BST is only recommended when VOUT = 3.3V or 5V and duty cycle exceeds 65%, to improve light-load efficiency and BST voltage stability.
How does the hiccup-mode overcurrent protection behave during a sustained short circuit?
When FB drops below 0.74V for >100ms, the device enters hiccup mode: it shuts down for ~10ms, then attempts restart. Average short-circuit current is reduced to ~1A, limiting junction temperature rise and enabling safe recovery once the fault is removed-no manual reset required.
Is the exposed thermal pad electrically connected internally?
No-the exposed pad is a thermal-only connection tied to the internal die substrate (GND potential), not bonded to any internal signal or power rail. It must be soldered to a dedicated PCB copper pour connected to system GND for both thermal and EMI performance.
What is the maximum achievable output voltage accuracy over temperature and line/load conditions?
Feedback reference voltage is specified as 0.788V to 0.828V (±2.5%) over –40°C to +85°C and 4.5V–30V input. Combined with resistor tolerance, total VOUT accuracy remains within ±3% for properly laid-out designs using 1% feedback resistors.
Does MP28490DN-LF-P support forced PWM or power-save mode?
No-it operates exclusively in fixed-frequency peak-current-mode control. There is no automatic pulse-skipping or discontinuous conduction mode (DCM); light-load efficiency is maintained via low quiescent current (1.1mA) and optimized gate drive, not mode switching.
What layout practices prevent noise coupling into the FB pin?
Place FB divider resistors adjacent to the FB pin; route FB trace short and away from SW, IN, and PG nodes; use ground guard ring around FB trace; avoid routing EN/SYNC near FB; and ensure GND return path avoids high-di/dt loops-critical for <1% output regulation error.
MP28490DN-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) 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):
- 30V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 5A
- Frequency - Switching:
- 420kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MP28490DN-LF-P FAQ
1.How can I place an order for MP28490DN-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP28490DN-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 MP28490DN-LF-P reliable?
The price and inventory of MP28490DN-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 MP28490DN-LF-P is usually 5 days.
3.What payment methods are accepted for MP28490DN-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP28490DN-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP28490DN-LF-P?
MP28490DN-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP28490DN-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 MP28490DN-LF-P?
For technical support, including MP28490DN-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP28490DN-LF-P requirements.
6.How does Aetrix verify that MP28490DN-LF-P is sourced from the original manufacturer or authorized distributors?
All MP28490DN-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 MP28490DN-LF-P meets industry standards.
7.What is the process for return or replacement of MP28490DN-LF-P?
All MP28490DN-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP28490DN-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 MP28490DN-LF-P part is unused and in its original packaging.
Return procedure for MP28490DN-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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