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Monolithic Power Systems Inc. MP2482DN-LF
- Part No.:
- MP2482DN-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP2482DN-LF.pdf
- Description:
- IC REG BUCK ADJ 5A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:2,525
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Product details
Overview
MP2482DN-LF from Monolithic Power Systems is a monolithic 5A, 30V step-down DC-DC converter with integrated 50mΩ high-side MOSFET, fixed 420kHz switching frequency, power-good indicator, and cycle-by-cycle over-current protection in thermally enhanced 8-pin SOIC package. It delivers stable 3.3V/5A output for digital set-top boxes and flat-panel displays.
For engineers reviewing the MP2482DN-LF datasheet, MP2482DN-LF pinout, MP2482DN-LF application, or MP2482DN-LF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal performance (θJA = 50°C/W), real-world efficiency curves (95% at 5A/12VIN→3.3V), and documented alternative selection guidance.
Technical Context
The MP2482DN-LF operates in fixed-frequency peak-current-mode control with internal 0.81V reference and 40× error amplifier gain, enabling fast transient response and simplified loop compensation. Its bootstrap gate driver supports high-duty-cycle operation up to 90%, with external BST capacitor charging via SW–BST path and optional IN4148 diode enhancement for 3.3V/5V outputs.
Thermal shutdown activates at 150°C with 140°C hysteresis, and hiccup-mode over-current protection engages when FB falls below 0.74V-triggering periodic restarts during sustained short-circuit conditions. UVLO thresholds are 4.1V (rising) and 3.2V (falling), referenced to the internal 5V regulator output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 30V - supports wide industrial and broadcast input rails including 5V, 12V, and 24V systems. |
| Continuous Output Current | 5A - delivers full rated load without derating at TA ≤ 65°C with SOIC8E exposed-pad layout. |
| Switch RDS(ON) | 50mΩ - enables high-efficiency operation with <125mV conduction loss at 5A. |
| Switching Frequency | 420kHz (fixed), synchronizable to 300kHz–1.5MHz - balances EMI, inductor size, and efficiency in space-constrained designs. |
| Feedback Reference Voltage | 0.808V (typical) - sets precise output voltage via resistor divider; ±20mV tolerance ensures <±0.6% VOUT accuracy at 3.3V. |
| Power Good Threshold | 0.74V (rising) with 40mV hysteresis - provides reliable system-level power sequencing and fault detection. |
| Thermal Resistance θJA | 50°C/W - achieved only with SOIC8E exposed pad soldered to PCB copper; enables 2.5W continuous dissipation at +25°C ambient. |
Pinout & Package
MP2482DN-LF uses the thermally enhanced 8-pin SOIC package (SOIC8E) with exposed thermal pad on underside. The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch Node | High-side MOSFET drain output; connects to inductor and bootstrap capacitor; carries full switching current and high dv/dt. |
| 2 BST | Bootstrap Supply | Provides floating gate drive voltage for high-side MOSFET; requires 0.1–1µF ceramic capacitor between BST and SW. |
| 3 VCC | Bias Supply | Internal 5V regulator output; decoupled with 1µF ceramic capacitor; powers control circuitry and gate drivers. |
| 4 GND | Analog Ground | Reference node for feedback and error amplifier; must be isolated from high-current return paths to avoid noise coupling. |
| 5 FB | Feedback Input | Senses output voltage via resistor divider; internal 0.81V reference enables adjustable VOUT from 0.81V to VIN−3V. |
| 6 PG | Power Good Open-Drain | Asserts low when VOUT drops >10% below nominal; requires 100kΩ pull-up to VCC or VOUT for logic-level signaling. |
| 7 EN/SYNC | Enable & Sync Input | Active-high enable; also accepts external clock (300kHz–1.5MHz) for synchronization to system timing source. |
| 8 IN | Main Input Supply | Accepts 4.5–30V unregulated input; requires local 22µF ceramic input capacitor to suppress switching transients. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 50mΩ High-Side MOSFET | Eliminates external switch and driver, reducing BOM count and PCB area while maintaining 5A capability in SOIC8E. |
| Power-Good Indicator with Hysteresis | Enables reliable system power sequencing and fault reporting without external comparators or monitoring ICs. |
| Cycle-by-Cycle Over-Current Protection + Hiccup Mode | Prevents thermal runaway during output shorts by limiting average fault current and enabling automatic recovery. |
| Stable with Low-ESR Ceramic Output Capacitors | Supports X5R/X7R MLCCs only-no electrolytic or tantalum required-reducing footprint, improving reliability, and lowering cost. |
| Internal Soft-Start (1.2V Ramp) | Prevents output overshoot and inrush current during startup, eliminating need for external soft-start circuitry. |
Applications
| Digital Set-Top Box Power | Flat Panel Display Logic Rail |
|---|---|
|
Use Scenario: Powers SoC, DDR memory, and video processing ASICs in cable/satellite STBs requiring clean 3.3V/5A under dynamic load steps. IC Role / Device Role / Timing Role: Primary non-synchronous buck regulator delivering main logic rail; handles 0–5A load transients with <5% output deviation. Use Value: 95% peak efficiency at 12VIN→3.3V/5A reduces thermal load in sealed enclosures and extends fanless operation. |
Use Scenario: Supplies 3.3V to timing controllers (TCON), LVDS transmitters, and backlight MCU in LCD/LED TVs and monitors. IC Role / Device Role / Timing Role: Fixed-frequency buck converter synchronized to system clock via EN/SYNC pin to minimize EMI in sensitive video signal paths. Use Value: PG pin directly interfaces with TCON reset logic for safe power-on sequencing; hiccup mode prevents damage during panel connector hot-plug events. |
| Personal Video Recorder (PVR) Storage | Broadband Gateway Baseband |
|
Use Scenario: Generates 3.3V for SATA controller, flash memory, and dual-core ARM processor in DVR/PVR units with intermittent high-current recording loads. IC Role / Device Role / Timing Role: Main system regulator with thermal shutdown and UVLO ensuring robust operation during brownouts and ambient temperature swings. Use Value: SOIC8E exposed pad enables 65°C ambient operation without heatsink-critical for compact, fanless PVR enclosures. |
Use Scenario: Powers baseband processors and Ethernet PHYs in DOCSIS 3.1 cable modems and fiber gateways operating from 12V or 24V wall adapters. IC Role / Device Role / Timing Role: High-efficiency buck stage upstream of LDOs; fixed 420kHz frequency avoids interference with DOCSIS upstream spectrum (5–42MHz). Use Value: 4.5–30V input range accommodates both 12V and 24V adapter options across product SKUs without redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2482DS-LF | No exposed thermal pad; θJA = 90°C/W; 1.4W max power dissipation vs. 2.5W for DN variant. | Suitable for lower ambient or forced-air-cooled designs where 5A continuous load is not sustained. | Select DS for cost-sensitive, lower-power applications; DN required for full 5A in natural convection. |
| MPQ2482DN-AEC1 | Automotive-grade (AEC-Q100 Grade 1); same SOIC8E package but qualified for -40°C to +125°C junction operation. | Validated for automotive infotainment and ADAS camera power rails; includes extended reliability testing. | Choose AEC1 for automotive deployments; standard DN-LF is optimized for industrial/consumer thermal profiles. |
Compared with MP2482DS-LF, the DN-LF delivers 79% higher thermal power handling due to its exposed pad; versus MPQ2482DN-AEC1, it offers identical electrical specs at lower cost and qualification overhead for non-automotive use.
Availability
MP2482DN-LF is available at Aetrix Electronics and suitable for digital set-top boxes, flat-panel television logic rails, and broadband gateway baseband power supplies requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for MP2482DN-LF 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 MP2482 belongs to MPS's high-current monolithic buck converter product line, engineered for space-constrained consumer and industrial applications demanding 5A output in SOIC packages without external MOSFETs or complex compensation networks.
FAQ
What is the minimum recommended input capacitance for MP2482DN-LF at 5A output?
A 22µF X5R/X7R ceramic capacitor is specified for 5A applications to suppress input ripple and limit surge current. This value ensures impedance remains below source impedance at 420kHz, preventing switching noise injection into upstream rails. Larger values improve hold-up time but do not enhance regulation stability.
Can MP2482DN-LF operate with an output voltage lower than 0.81V?
No. The internal reference is fixed at 0.81V, and the feedback amplifier requires VFB ≥ 0.788V (min) to regulate. Output voltages below 0.81V cannot be achieved with standard resistor-divider configuration; external amplification or different topology is required.
Is an external bootstrap diode mandatory for MP2482DN-LF?
No. The internal bootstrap circuit functions reliably across all duty cycles. An external IN4148 diode is optional and recommended only for high-duty-cycle cases (e.g., 5V→3.3V, D > 65%) to reduce BST capacitor discharge and improve light-load efficiency.
How does the hiccup-mode over-current protection behave during sustained short-circuit?
When FB falls below 0.74V, the device enters hiccup mode: it disables switching for ~10ms, then attempts restart. If short persists, it repeats the cycle. Average short-circuit current is limited to ~1.5A, reducing junction temperature rise and preventing thermal damage during fault conditions.
What is the maximum allowable output capacitor ESR for stable operation?
The MP2482DN-LF is designed for low-ESR ceramic capacitors only. No maximum ESR is specified because stability relies on zero-ESR behavior of X5R/X7R MLCCs. Electrolytic or high-ESR capacitors will cause instability and oscillation due to missing phase margin from the internal Type-II compensation network.
Does MP2482DN-LF support forced PWM mode or skip-cycle operation?
No. It operates exclusively in fixed-frequency peak-current-mode control. There is no pulse-skipping, burst-mode, or forced-PWM option. Light-load efficiency is maintained via low quiescent current (0.9mA typ) rather than mode switching.
What layout practices are critical for thermal performance in SOIC8E package?
The exposed thermal pad must be fully soldered to a dedicated PCB copper pour connected to GND. Minimum recommended copper area is 250 mm² with ≥4 thermal vias (0.3mm diameter) to inner ground planes. Avoid routing high-speed signals under the IC body to prevent coupling into FB and PG pins.
MP2482DN-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- 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):
- 0.81V
- Voltage - Output (Max):
- 27V
- Current - Output:
- 5A
- Frequency - Switching:
- 420kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MP2482DN-LF FAQ
1.How can I place an order for MP2482DN-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2482DN-LF 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 MP2482DN-LF reliable?
The price and inventory of MP2482DN-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2482DN-LF is usually 5 days.
3.What payment methods are accepted for MP2482DN-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2482DN-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2482DN-LF?
MP2482DN-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2482DN-LF 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 MP2482DN-LF?
For technical support, including MP2482DN-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2482DN-LF requirements.
6.How does Aetrix verify that MP2482DN-LF is sourced from the original manufacturer or authorized distributors?
All MP2482DN-LF 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 MP2482DN-LF meets industry standards.
7.What is the process for return or replacement of MP2482DN-LF?
All MP2482DN-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP2482DN-LF, 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 MP2482DN-LF part is unused and in its original packaging.
Return procedure for MP2482DN-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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