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Monolithic Power Systems Inc. MP8666DN-LF-P
- Part No.:
- MP8666DN-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP8666DN-LF-P.pdf
- Description:
- IC REG BUCK ADJ 6A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:3,568
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Product details
Overview
MP8666DN-LF-P from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated 45mΩ high-side MOSFET and external low-side gate driver, delivering 6A continuous output current across 4.5V–21V input range, fixed 600kHz switching frequency, and adjustable 0.8V reference output voltage - used in point-of-load regulation for flat-panel displays and broadband communications equipment.
For engineers reviewing the MP8666DN-LF-P datasheet, MP8666DN-LF-P pinout, MP8666DN-LF-P application, or MP8666DN-LF-P equivalent, key selection criteria include synchronizable 300kHz–1.5MHz frequency range, cycle-by-cycle over-current protection with hiccup mode, thermal shutdown at 150°C, and SOIC8E package with exposed pad for thermal management.
Technical Context
The MP8666 operates in fixed-frequency peak-current-mode control with internal 0.8V reference and error amplifier driving COMP node for loop stability. Its bootstrap-driven floating gate driver supports external synchronous rectification, enabling >95% efficiency at full load with ceramic output capacitors.
UVLO triggers at 4.1V (rising) with 880mV hysteresis on VCC rail; EN/SYNC pin serves dual function - logic enable/disable with 5µs turnoff delay and external clock synchronization up to 1.5MHz via rising-edge alignment. Internal soft-start ramps reference from 0V to 1.2V to limit inrush.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 21V - supports wide industrial and telecom input rails without pre-regulation. |
| Output Current | 6A continuous - enables single-chip PoL supply for FPGA I/O or SoC core rails. |
| Switching Frequency | Fixed 600kHz, synchronizable 300kHz–1.5MHz - allows EMI optimization and multi-rail phase alignment. |
| Feedback Reference | 0.808V ±2% - sets precise output voltage via resistor divider; stable under ceramic capacitor loads. |
| Internal MOSFET RDS(on) | 45mΩ - limits conduction loss at 6A, enabling high efficiency without external high-side switch. |
| Gate Driver Sink/Source | 1Ω sink / 4Ω source impedance - ensures fast turn-off and controlled turn-on of external low-side MOSFET. |
| Thermal Shutdown | 150°C with 10°C hysteresis - protects die during overload or poor PCB thermal design; resumes at 140°C. |
Pinout & Package
MP8666DN-LF-P is housed in an 8-pin SOIC package with exposed thermal pad (SOIC8E), optimized for surface-mount assembly and thermal dissipation via PCB copper area connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch Node Output | Connects to inductor and external low-side MOSFET source; carries high di/dt switching current. |
| 2 BST | Bootstrap Supply | Provides floating gate drive voltage for low-side MOSFET; requires 0.1–1µF ceramic capacitor to SW. |
| 3 VCC | BG Driver Bias Supply | Internally regulated 5V rail powering gate driver; decoupled with 1µF X7R/X5R ceramic capacitor. |
| 4 BG | Gate Driver Output | Drives gate of external synchronous MOSFET; sink/source impedance ensures robust switching edge control. |
| 5 GND | Analog & Power Ground | Reference for FB and internal circuits; must be isolated from high-current return paths to avoid noise coupling. |
| 6 FB | Feedback Input | Senses output voltage via resistor divider; internal 0.8V reference enables adjustable output from 0.8V. |
| 7 EN/SYNC | Enable & Sync Input | Active-high enable with 5µs shutdown delay; accepts external clock 300kHz–1.5MHz for EMI reduction. |
| 8 IN | Main Input Supply | Accepts 4.5V–21V unregulated input; requires local 22µF X5R/X7R ceramic input capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronizable gate driver | Supports external clock up to 1.5MHz - enables multi-rail timing coordination and EMI spread-spectrum operation. |
| Cycle-by-cycle over-current protection | 8A current limit with hiccup mode - prevents thermal runaway during sustained short-circuit conditions. |
| Stable with low-ESR ceramics | No electrolytic capacitor required - reduces board space and improves long-term reliability in compact designs. |
| Integrated UVLO with hysteresis | 4.1V turn-on / 3.2V turn-off threshold - avoids oscillation near brown-out conditions. |
| Thermally enhanced SOIC8E | θJA = 50°C/W, θJC = 10°C/W - enables 6A operation with minimal heatsinking when exposed pad is soldered. |
Applications
| Flat Panel Television Power | Digital Set-Top Box Core Rail |
|---|---|
|
Use Scenario: Supplies 3.3V/5V logic rails for display timing controllers and video processors in LCD/LED TVs. IC Role / Device Role / Timing Role: Primary synchronous buck regulator managing dynamic load transients during video frame updates. Use Value: 6A capability and 600kHz fixed frequency ensure stable voltage under rapid backlight dimming and resolution switching. |
Use Scenario: Powers SoC core and DDR memory interfaces in cable/satellite STBs with bursty CPU activity. IC Role / Device Role / Timing Role: Point-of-load regulator with fast transient response for digital signal processing workloads. Use Value: Current-mode control and 0.8V reference enable tight regulation (<±1%) across 100mA–6A load steps. |
| Broadband Access Gateway | Personal Video Recorder (PVR) Storage Interface |
|
Use Scenario: Generates 1.2V/1.8V rails for Ethernet PHYs and packet processors in DSL/cable modems. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter feeding downstream LDOs or POL modules. Use Value: Synchronizable frequency eliminates beat frequencies between multiple converters in dense RF-sensitive layouts. |
Use Scenario: Delivers 12V-to-5V conversion for SATA HDD power and USB host controllers in PVRs. IC Role / Device Role / Timing Role: Main DC/DC stage supporting hot-plug detection and spin-up surge currents. Use Value: Hiccup-mode OCP limits average short-circuit current to <1A, preventing thermal damage during HDD failure events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ8666GD-AEC1 | Automotive-grade (-40°C to +125°C), AEC-Q100 qualified, same pinout and electrical specs. | Required for automotive infotainment head units and ADAS camera power supplies. | Select when extended temperature range and automotive qualification are mandatory. |
| MP8667DN-LF-P | Higher 8A output current, identical 4.5V–21V input, same SOIC8E package and pinout. | Used where future-proofing for higher load or parallel operation is needed. | Choose when system margin demands >6A or dual-phase scalability is planned. |
Compared with MPQ8666GD-AEC1, MP8666DN-LF-P offers lower cost and standard industrial temp range; versus MP8667DN-LF-P, it trades 2A output headroom for tighter BOM control in 6A-constrained designs.
Availability
MP8666DN-LF-P is available at Aetrix Electronics and suitable for flat panel television power, digital set-top box core rail, and broadband communications equipment requiring stable component supply and RoHS-compliant packaging.
Supply support for MP8666DN-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.
The MP8666 belongs to MPS's high-current synchronous buck controller product line, designed specifically for efficient, compact point-of-load regulation in space-constrained consumer and telecom infrastructure applications.
FAQ
What is the minimum recommended input capacitance for MP8666DN-LF-P at 6A output?
A 22µF X5R or X7R ceramic capacitor is specified for 6A operation. This value suppresses high-frequency switching noise and limits input surge current. Lower values may cause VIN droop or EMI compliance issues under full load transients.
Can MP8666DN-LF-P operate without an external bootstrap diode?
Yes - the internal bootstrap charging circuit (via D1, M3, and C4) supports duty cycles up to ~65%. An external IN4148 diode is only recommended when VOUT/VIN > 0.65 to maintain sufficient BST voltage under high-duty-cycle conditions.
How does the hiccup-mode over-current protection behave during sustained short-circuit?
When FB falls below 250mV (indicating severe overload), the oscillator frequency folds back and the device enters hiccup mode: it attempts restart every ~10ms, limiting average short-circuit current to <1A and preventing thermal damage.
Is the MP8666DN-LF-P pin-compatible with earlier MP8666 revisions?
Yes - MP8666DN-LF-P uses the same SOIC8E package and pinout as MP8666DN and MP8666DN-Z. The "-LF" suffix denotes lead-free RoHS-compliant finish; electrical and thermal performance are identical per Rev. 1.21 datasheet.
What is the maximum allowable ambient temperature for continuous 6A operation?
At TA = +85°C, full 6A output is achievable only with proper PCB thermal design: exposed pad soldered to ≥4 cm² of 2oz copper, minimal trace resistance, and no adjacent heat sources. Derating begins above 70°C without forced airflow.
Does the EN/SYNC pin require a pull-up resistor for automatic startup?
No - tying EN/SYNC directly to VIN enables automatic startup. A pull-up is unnecessary because the internal UVLO on VCC ensures the chip only enables after VCC reaches 4.1V. External pull-up adds no functional benefit and risks sync interference.
Which external MOSFET parameters are critical for optimal MP8666DN-LF-P efficiency?
Low Qg (<25nC) and RDS(on) (<5mΩ @ VGS = 4.5V) are essential. The BG driver's 1Ω sink/4Ω source impedance favors fast-switching devices like FDS6670AS or IRF7821 to minimize switching losses at 600kHz.
MP8666DN-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):
- 21V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 18.9V
- Current - Output:
- 6A
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MP8666DN-LF-P FAQ
1.How can I place an order for MP8666DN-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP8666DN-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 MP8666DN-LF-P reliable?
The price and inventory of MP8666DN-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 MP8666DN-LF-P is usually 5 days.
3.What payment methods are accepted for MP8666DN-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP8666DN-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP8666DN-LF-P?
MP8666DN-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP8666DN-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 MP8666DN-LF-P?
For technical support, including MP8666DN-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP8666DN-LF-P requirements.
6.How does Aetrix verify that MP8666DN-LF-P is sourced from the original manufacturer or authorized distributors?
All MP8666DN-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 MP8666DN-LF-P meets industry standards.
7.What is the process for return or replacement of MP8666DN-LF-P?
All MP8666DN-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP8666DN-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 MP8666DN-LF-P part is unused and in its original packaging.
Return procedure for MP8666DN-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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