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Monolithic Power Systems Inc. MP8676DN-LF
- Part No.:
- MP8676DN-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP8676DN-LF.pdf
- Description:
- IC REG BUCK ADJ 4.5A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:3,359
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Product details
Overview
MP8676DN-LF from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated 100mΩ high-side MOSFET and external low-side gate driver, delivering 4.5A continuous output current across 4.5V–42V input range, fixed 420kHz switching frequency, and adjustable 0.8V–38V output voltage - deployed in flat-panel TV power rails.
For engineers reviewing the MP8676DN-LF datasheet, MP8676DN-LF pinout, MP8676DN-LF application, or MP8676DN-LF equivalent, key selection criteria include synchronizable frequency up to 1.5MHz, cycle-by-cycle overcurrent protection with hiccup mode, thermal shutdown at 150°C, and SOIC8E thermally enhanced package with exposed pad.
Technical Context
The MP8676DN-LF implements fixed-frequency peak-current-mode control with internal 0.8V reference and error amplifier driving COMP node for loop stability. Its architecture integrates a high-side MOSFET switch and a dedicated BG driver for external synchronous rectification, enabling >95% efficiency at full load.
It features dual regulation paths: VCC internal regulator (4.5–5.0V output) powers analog circuitry and BG driver bias, while bootstrap capacitor (BST–SW) supplies floating gate drive for the external low-side MOSFET. UVLO triggers at 4.1V rising threshold with 880mV hysteresis, and soft-start ramps internal reference from 0V to 1.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 42V - supports automotive battery-supplied systems and industrial 24V/36V rails without pre-regulation. |
| Continuous Output Current | 4.5A - enables single-chip 3.3V/5V rail generation for SoC core or memory subsystems in digital set-top boxes. |
| Switching Frequency | Fixed 420kHz, synchronizable 300kHz–1.5MHz - allows EMI tuning and avoids noise bands in audio/video signal chains. |
| Feedback Reference Voltage | 0.808V (typ) - sets precise output regulation with ±2.5% tolerance over temperature and line, enabling accurate 1.8V/2.5V/3.3V outputs. |
| High-Side RDS(on) | 100mΩ (guaranteed by design) - limits conduction loss to ≤2.025W at 4.5A, reducing thermal stress in SOIC8E package. |
| Thermal Shutdown Threshold | 150°C - protects die integrity during sustained overload or poor PCB heatsinking; auto-recovery at ~140°C. |
| EN/SYNC Pin Function | Dual-mode: logic enable/disable (0.4V/2V thresholds) + external clock sync (300kHz–1.5MHz) - simplifies system-level timing coordination. |
Pinout & Package
MP8676DN-LF is housed in an 8-pin SOIC package with exposed thermal pad (SOIC8E), optimized for surface-mount assembly and PCB-level heat dissipation (θJA = 50°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch Node Output | Drives external inductor; connects to BST capacitor and low-side MOSFET source - high dv/dt node requiring tight layout. |
| 2 BST | Bootstrap Supply | Provides floating gate drive voltage for external low-side MOSFET via SW–BST capacitor; requires 0.1–1µF ceramic. |
| 3 VCC | BG Driver Bias Supply | Internal 5V regulator output; must be decoupled with ≥1µF ceramic capacitor to sustain gate drive current under load transients. |
| 4 BG | Low-Side Gate Driver Output | Sinks/source up to 1A peak to drive external N-channel MOSFET gate; RSINK = 1Ω, RSOURCE = 4Ω define drive strength. |
| 5 GND | Analog & Power Ground Reference | Reference for FB, EN/SYNC, and internal regulators; must be isolated from high-current PGND paths to avoid noise coupling. |
| 6 FB | Voltage Feedback Input | Monitors output via resistor divider; internal 0.8V reference enables precise output setting; foldback activates below 250mV. |
| 7 EN/SYNC | Enable Control / Clock Sync Input | Pull ≥2V to enable; pull ≤0.4V for shutdown (min 5µs); accepts external clock edges for frequency synchronization. |
| 8 IN | Main Power Input | Accepts unregulated 4.5–42V supply; requires local 22µF X5R/X7R ceramic input capacitor to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronizable switching frequency | Adjustable from 300kHz to 1.5MHz via EN/SYNC pin - enables EMI compliance in noise-sensitive video/audio systems. |
| Cycle-by-cycle overcurrent protection | 6.5A current limit with hiccup-mode recovery - prevents thermal runaway during output short-circuit without latch-off. |
| Stable with low-ESR ceramic capacitors | No electrolytic or tantalum required; supports X5R/X7R MLCCs for compact, long-life output filtering in space-constrained designs. |
| Integrated high-side MOSFET + external low-side driver | Reduces BOM count vs. controller-only solutions; eliminates need for separate high-side driver IC or bootstrap IC. |
| Thermally enhanced SOIC8E package | Exposed pad soldered to PCB copper improves θJA by ~30% vs. standard SOIC8 - sustains 4.5A output at +85°C ambient. |
Applications
| Digital Set-Top Box Power Rail | Personal Video Recorder (PVR) Core Supply |
|---|---|
|
Use Scenario: Powers SoC core voltage (1.2V) and DDR memory interface (1.8V) in cable/satellite STB platforms with 12V or 24V input. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated, low-noise DC output with fast transient response to handle bursty video decoding loads. Use Value: Integrated high-side switch and gate driver eliminate two external components; 420kHz operation avoids audible noise in nearby audio circuits. |
Use Scenario: Generates 3.3V and 5V rails for HDD controller, USB host, and HDMI transmitter in PVR units operating from 12V wall adapter. IC Role / Device Role / Timing Role: Synchronous buck converter with hiccup-mode OCP ensures safe operation during HDD spin-up current surges. Use Value: 4.5A capability supports dual-rail generation with single IC; SOIC8E exposed pad maintains <85°C junction temp under full load. |
| Flat Panel Television Backlight & Logic Supply | Broadband Gateway Power Management |
|
Use Scenario: Supplies 3.3V logic rail and 5V backlight driver bias in LCD/LED TVs with wide-input 12–36V power bus. IC Role / Device Role / Timing Role: Fixed-frequency current-mode regulator delivering stable output despite input ripple from upstream PFC stage. Use Value: 42V max input withstands load-dump transients; 0.8V feedback reference enables accurate 3.3V/5V outputs with 1% resistors. |
Use Scenario: Powers Ethernet PHY, Wi-Fi SoC, and packet processor in DOCSIS 3.1 gateways using 12V or 24V PoE-derived input. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter synchronized to system clock to reduce conducted EMI in RF-sensitive environments. Use Value: 1.5MHz sync capability aligns switching edge with baseband timing, minimizing spectral interference with 2.4GHz/5GHz radios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ8676GD-AEC1 | Automotive-grade variant (AEC-Q100 Grade 1), same electrical specs but qualified for –40°C to +125°C junction, enhanced ESD robustness. | Required for infotainment head units or ADAS camera modules where ambient exceeds +85°C. | Select when automotive qualification, extended temperature, or higher reliability testing is mandated - not drop-in for commercial use. |
| LM5116PWPR | Controller-only (no integrated high-side FET); requires external high- and low-side MOSFETs; supports up to 100V input. | Suitable for ultra-high-input applications (>42V) or designs needing custom FET selection for efficiency optimization. | Choose only if input >42V or discrete FET optimization is needed; adds 4+ components and layout complexity vs. MP8676DN-LF. |
Compared with MPQ8676GD-AEC1, the MP8676DN-LF offers identical performance at lower cost and smaller footprint for commercial applications, while LM5116PWPR trades integration for flexibility in extreme input or thermal environments.
Availability
MP8676DN-LF is available at Aetrix Electronics and suitable for digital set-top box power rails, flat panel television logic supplies, and broadband gateway DC/DC conversion requiring stable component supply, RoHS-compliant packaging, and lead-free assembly compatibility.
Supply support for MP8676DN-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 mixed-signal ICs for power management, motion control, and interface applications.
The MP8676 belongs to MPS's high-voltage synchronous buck converter product line, designed specifically for cost-sensitive, space-constrained consumer and industrial systems requiring wide-input, high-current DC/DC conversion without external drivers.
FAQ
What is the minimum recommended input capacitance for MP8676DN-LF at 4.5A output?
A 22µF X5R or X7R ceramic capacitor is specified for 4.5A output applications. This value ensures low impedance at 420kHz, suppresses input surge current, and minimizes voltage spikes on the IN pin. Larger values improve hold-up time but are not required for basic stability.
Can MP8676DN-LF operate without an external bootstrap diode?
Yes - the internal bootstrap charging circuit operates without an external diode for most duty cycles. An external IN4148 diode is only recommended when VOUT = 3.3V or 5V and duty cycle exceeds 65%, to improve efficiency by reducing BST capacitor discharge losses.
How does the hiccup-mode overcurrent protection behave during sustained short-circuit?
When FB voltage drops below 250mV due to overload, the MP8676DN-LF enters hiccup mode: it disables switching, waits ~10ms, then attempts restart. This cycle repeats until fault clears or EN is cycled, limiting average power dissipation and preventing thermal damage.
Is the exposed thermal pad of the SOIC8E package electrically connected internally?
No - the exposed pad is thermally conductive only and must be soldered to a PCB copper pour for heat dissipation. It is not connected to any internal circuit node and should be tied to GND solely for thermal and mechanical stability, not electrical function.
What is the purpose of the internal soft-start ramp, and how long does it take?
The internal soft-start generates a 0V-to-1.2V ramp that overrides the 0.8V reference during startup, limiting inrush current and preventing output overshoot. The ramp time is fixed and calibrated to achieve controlled rise of VOUT in typical 3.3V/4.5A configurations - no external components are needed.
Does MP8676DN-LF support forced PWM mode at light load?
No - the MP8676DN-LF operates exclusively in continuous conduction mode (CCM) with fixed-frequency current-mode control. It does not feature pulse-skipping or forced-PWM modes; light-load efficiency relies on low quiescent current (0.9mA typ) and low RDS(on).
What is the maximum allowable voltage on the BST pin relative to SW?
The absolute maximum BST-to-SW voltage is 6V. Exceeding this risks damage to the floating gate driver. The internal bootstrap regulator clamps BST voltage to ~5V when (VIN − VSW) > 5V, ensuring safe operation within specification across all duty cycles.
MP8676DN-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:
- Discontinued at Digi-Key
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 38V
- Current - Output:
- 4.5A
- Frequency - Switching:
- 420kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MP8676DN-LF FAQ
1.How can I place an order for MP8676DN-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP8676DN-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 MP8676DN-LF reliable?
The price and inventory of MP8676DN-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP8676DN-LF is usually 5 days.
3.What payment methods are accepted for MP8676DN-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP8676DN-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP8676DN-LF?
MP8676DN-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP8676DN-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 MP8676DN-LF?
For technical support, including MP8676DN-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP8676DN-LF requirements.
6.How does Aetrix verify that MP8676DN-LF is sourced from the original manufacturer or authorized distributors?
All MP8676DN-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 MP8676DN-LF meets industry standards.
7.What is the process for return or replacement of MP8676DN-LF?
All MP8676DN-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP8676DN-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 MP8676DN-LF part is unused and in its original packaging.
Return procedure for MP8676DN-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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