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Monolithic Power Systems Inc. MP1482DS-LF
- Part No.:
- MP1482DS-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP1482DS-LF.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,386
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Product details
Overview
MP1482DS-LF from Monolithic Power Systems is a synchronous rectified, current-mode step-down DC/DC converter integrating dual 130mΩ N-channel MOSFETs, delivering up to 2A continuous output current across a 4.75V–18V input range, with adjustable output from 0.923V to 15V and fixed 340kHz switching frequency-used in FPGA/DSP power supplies and notebook computers.
For engineers reviewing the MP1482DS-LF datasheet, MP1482DS-LF pinout, MP1482DS-LF application, or MP1482DS-LF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and efficiency behavior, and real-world design constraints including soft-start timing, UVLO thresholds, and SOIC8 layout-critical node routing.
Technical Context
The MP1482DS-LF implements current-mode control with cycle-by-cycle overcurrent protection and internal transconductance error amplification (GEA = 800μA/V) referenced to a 0.923V feedback threshold. Its functional block includes integrated high- and low-side switches, a 5V internal regulator for bootstrap charging, and dedicated COMP pin for loop compensation via external RC network.
It features programmable soft-start (6μA current into SS pin), input under-voltage lockout (4.10V nominal threshold with 210mV hysteresis), and thermal shutdown at 160°C. The device requires an external bootstrap capacitor between SW and BS pins to drive the high-side MOSFET gate above VIN, enabling operation down to 0.923V output with up to 93% peak efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous-supports FPGA core rails and DSP I/O supplies without external current boosting. |
| Input Voltage Range | 4.75V to 18V-compatible with 5V, 12V, and 15V intermediate bus architectures. |
| Output Voltage Range | 0.923V to 15V-set by resistive divider on FB pin; enables 1.2V, 1.8V, 3.3V, and 5V regulation. |
| Switching Frequency | Fixed 340kHz-enables predictable EMI filtering and consistent inductor sizing (e.g., 10µH typical). |
| Efficiency | Up to 93% at 3.3V/2A-achieved using synchronous rectification and low RDS(ON) (130mΩ each) MOSFETs. |
| Shutdown Current | 1µA-minimizes battery drain in always-on subsystems during standby mode. |
| Soft-Start Time | 15ms with 0.1µF SS-to-GND capacitor-prevents inrush current into downstream ceramic output capacitors. |
Pinout & Package
MP1482DS-LF is housed in an 8-pin SOIC package (JEDEC MS-012, variation AA), with exposed pad not electrically connected. Thermal resistance θJA = 90°C/W on 4-layer board; θJC = 45°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BS | Bootstrap Supply Input | Connects to SW via ≥0.01µF capacitor to generate gate drive voltage >VIN for high-side MOSFET. |
| 2 IN | Main Power Input | Accepts 4.75V–18V; requires local low-ESR bypass capacitor to suppress switching noise. |
| 3 SW | Switch Node Output | Drives external LC filter; connects to BS capacitor and inductor; high di/dt node requiring tight layout. |
| 4 GND | Power Ground | Primary return path for high-current switching; must be low-impedance and tied to PGND plane. |
| 5 FB | Feedback Input | Senses output via resistor divider; regulated to 0.923V; sensitive analog node requiring short trace routing. |
| 6 COMP | Compensation Node | Output of internal error amplifier; connects to RC network for loop stability and transient response tuning. |
| 7 EN | Enable Control | Logic-level input (1.5V threshold); pull-up to VIN enables automatic startup; drives <1µA leakage when off. |
| 8 SS | Soft-Start Control | Current-sink input (6µA); capacitor value sets ramp time-0.1µF = 15ms; open = disable soft-start. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Dual integrated 130mΩ N-MOSFETs eliminate external Schottky loss and improve light-load efficiency. |
| Current-mode control | Enables fast load transient response (<10µs recovery) and inherent cycle-by-cycle current limiting at 3.4A min. |
| Stable with ceramic output caps | Supports low-ESR X5R/X7R ceramics without external compensation tweaks-reduces BOM count and footprint. |
| Programmable soft-start | Adjustable ramp via SS pin capacitor prevents input voltage sag and output overshoot during power-up. |
| UVLO with hysteresis | 4.10V turn-on with 210mV hysteresis avoids oscillation near brownout conditions in noisy 12V systems. |
Applications
| FPGA Core Power Supply | DSP I/O Rail Regulation |
|---|---|
|
Use Scenario: Providing clean, tightly regulated 1.2V core voltage to Xilinx Artix-7 FPGA under dynamic logic switching loads. IC Role / Device Role / Timing Role: Primary buck regulator supplying core logic domain; handles 0–2A step transients within 10µs. Use Value: Integrated MOSFETs and current-mode control deliver <2% output deviation during 1.5A/µs load steps-meets FPGA VCCINT ripple spec. |
Use Scenario: Generating stable 3.3V I/O supply for TI C6748 DSP in industrial motor control gateway. IC Role / Device Role / Timing Role: Secondary buck stage converting 12V intermediate bus to isolated I/O rail; synchronized via EN sequencing. Use Value: 93% efficiency at full load reduces thermal load in sealed enclosures; 1µA shutdown supports low-power sleep modes. |
| Notebook System Power | Green Appliance SMPS |
|
Use Scenario: Replacing linear regulators in ultrabook motherboard for DDR3 memory termination voltage (VTT = 0.9V). IC Role / Device Role / Timing Role: Compact, low-noise buck converter operating from 5V rail; soft-start prevents VTT overshoot during resume-from-sleep. Use Value: SOIC8 footprint and minimal external parts (1 inductor, 2 caps, 2 resistors) enable <80mm² solution size-critical for thin form factors. |
Use Scenario: Powering microcontroller and sensor interface in ENERGY STAR–certified smart washing machine control board. IC Role / Device Role / Timing Role: Main 3.3V system rail generator from 15V auxiliary supply; UVLO ensures safe restart after line dips. Use Value: RoHS-compliant MP1482DS-LF meets global environmental compliance; 160°C thermal shutdown protects against fan failure scenarios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP1476DS-LF | Higher 3A rating, 20V max input, same SOIC8 package and pinout; improved thermal performance (θJA = 75°C/W). | Supports higher current FPGA cores and longer hold-up times in 12V systems; replaces MP1482 where >2A margin is required. | Select MP1476DS-LF for new designs needing headroom or extended input range-MP1482 is marked "Not Recommended for New Designs". |
| LM2678-3.3/NOPB | Non-synchronous, 5A capable, 40V max input, TO-220-5 package; external diode required; 260kHz fixed frequency. | Larger footprint and lower efficiency (~85% at 2A); suited for ruggedized industrial supplies where heat sinking is available. | Choose LM2678 only if SOIC8 thermal limits are exceeded and board space allows TO-220 mounting; not drop-in compatible. |
Compared with MP1482DS-LF, MP1476DS-LF offers higher current capability and better thermal metrics in identical packaging, while LM2678-3.3/NOPB trades integration and efficiency for ruggedness and voltage headroom-making MP1476 the preferred upgrade path for new designs.
Availability
MP1482DS-LF is available at Aetrix Electronics and suitable for FPGA power supplies, DSP I/O regulation, and notebook system rail generation requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MP1482DS-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, headquartered in Kirkland, WA, with global design and support centers.
The MP1482 belongs to MPS's mainstream synchronous buck regulator product line, designed for cost-sensitive, space-constrained applications in computing, networking, and consumer electronics where integration, efficiency, and ease of use are prioritized.
FAQ
What is the minimum output voltage achievable with MP1482DS-LF?
The MP1482DS-LF achieves a minimum regulated output voltage of 0.923V, set by its internal feedback reference voltage. This is confirmed in the Electrical Characteristics table (VFB = 0.923V typ) and enables direct powering of modern low-voltage FPGA cores and ARM processor cores without external amplification.
Can MP1482DS-LF operate with a 3.3V input supply?
No-MP1482DS-LF has a minimum input voltage of 4.75V per Absolute Maximum Ratings and Recommended Operating Conditions. Attempting operation below 4.75V will trigger input UVLO (threshold 4.10V), preventing startup and potentially causing erratic behavior or no regulation.
Is an external Schottky diode required for basic operation?
No external Schottky diode is required-the MP1482DS-LF uses synchronous rectification with integrated low-side MOSFET. However, adding a parallel Schottky (e.g., B130) may improve efficiency by ~1–2% at light loads where body diode conduction dominates, per Application Information Section 7.
What is the purpose of the BS pin, and how must it be connected?
The BS (Bootstrap) pin supplies gate drive voltage to the high-side MOSFET. It must be connected to the SW node via a ≥0.01µF ceramic capacitor. During SW low phase, the internal 5V regulator charges this capacitor; during high phase, it floats above VIN to drive the high-side gate-enabling synchronous operation down to 0.923V output.
Does MP1482DS-LF support power sequencing with other rails?
Yes-via the EN pin, which accepts logic-level control (1.5V threshold). Driving EN with a delayed voltage or microcontroller GPIO enables precise power-up/down sequencing relative to other system rails, critical for FPGA and ASIC applications where VCCIO must ramp before VCCINT.
Why is MP1482 marked "Not Recommended for New Designs"?
MPS explicitly states this in the datasheet due to the introduction of the pin-compatible, enhanced MP1476 (3A, 20V, improved thermal performance). While MP1482DS-LF remains fully functional and supported, MP1476DS-LF offers superior specs and longer projected lifecycle-making it the designated successor for new projects.
What is the maximum allowable output capacitance?
No absolute maximum is specified, but stability analysis shows the MP1482DS-LF supports wide ranges: ceramic outputs up to 100µF and tantalum/electrolytic up to 470µF are validated in application circuits. Excessive capacitance (>220µF ceramic) may slow transient response unless compensated via COMP network adjustment.
MP1482DS-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.75V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.923V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 2A
- Frequency - Switching:
- 340kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MP1482DS-LF FAQ
1.How can I place an order for MP1482DS-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP1482DS-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 MP1482DS-LF reliable?
The price and inventory of MP1482DS-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP1482DS-LF is usually 5 days.
3.What payment methods are accepted for MP1482DS-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP1482DS-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP1482DS-LF?
MP1482DS-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP1482DS-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 MP1482DS-LF?
For technical support, including MP1482DS-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP1482DS-LF requirements.
6.How does Aetrix verify that MP1482DS-LF is sourced from the original manufacturer or authorized distributors?
All MP1482DS-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 MP1482DS-LF meets industry standards.
7.What is the process for return or replacement of MP1482DS-LF?
All MP1482DS-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP1482DS-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 MP1482DS-LF part is unused and in its original packaging.
Return procedure for MP1482DS-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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