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Monolithic Power Systems Inc. MP38671DL-LF-Z
- Part No.:
- MP38671DL-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 14-VFDFN Exposed Pad
- Datasheet:
-
MP38671DL-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 10A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,801
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Product details
Overview
MP38671DL-LF-Z from Monolithic Power Systems is a monolithic synchronous step-down DC/DC converter with integrated 60mΩ high-side MOSFET and external low-side gate driver, delivering 10A continuous output current across 4.5V–25V input range, fixed 600kHz switching frequency, and adjustable 0.8V–15V output voltage - deployed in digital set-top boxes for core SoC power delivery.
For engineers reviewing the MP38671DL-LF-Z datasheet, MP38671DL-LF-Z pinout, MP38671DL-LF-Z application, or MP38671DL-LF-Z equivalent, key selection criteria include its synchronizable gate driver (supports >1MHz external clock), cycle-by-cycle overcurrent protection, thermal shutdown at 150°C, and compatibility with low-ESR ceramic output capacitors in space-constrained 3×4mm QFN14 layouts.
Technical Context
The MP38671 operates in fixed-frequency peak-current-mode control with internal 0.8V reference and error amplifier driving COMP node for loop stabilization. Its functional block includes an integrated high-side switch, bootstrap-driven external low-side MOSFET gate driver (BST, BG pins), and dedicated EN/SYNC pin enabling both enable/disable control and external clock synchronization from 300kHz to 1.4MHz.
Protection architecture combines cycle-by-cycle current limiting (12A typ), UVLO with 4.1V rising threshold and 880mV hysteresis, soft-start (1–5ms), latch-off mode triggered by FB <0.25V (output undervoltage), and thermal shutdown at 150°C with 140°C restart hysteresis - all implemented without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 25V - supports wide industrial and consumer input rails including 5V, 12V, and 24V systems. |
| Output Current | 10A continuous - enables single-chip point-of-load regulation for high-power SoCs and FPGAs. |
| Switching Frequency | Fixed 600kHz (±200kHz) - balances efficiency and EMI; synchronizable up to 1.4MHz for noise-sensitive applications. |
| Internal High-Side RDS(on) | 60mΩ - reduces conduction loss and thermal stress at full load, enabling compact thermal design. |
| Feedback Reference | 0.808V (typ) - sets precise output voltage via external resistor divider; ±2.5% tolerance ensures tight regulation. |
| Power Good Threshold | 0.74V (typ), 40mV hysteresis - provides reliable system-level power sequencing and fault detection. |
| Thermal Shutdown | 150°C junction temperature - protects against sustained overload or poor PCB thermal layout. |
Pinout & Package
MP38671DL-LF-Z is housed in a thermally enhanced 3mm × 4mm, 14-pin QFN package with exposed thermal pad (connected to GND). The package supports high-current routing and efficient heat dissipation via PCB copper pour under the exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback Input | Connects to resistor divider tap; regulates output voltage; triggers foldback below 250mV during short-circuit. |
| 2 PG | Power Good Open-Drain Output | Signals valid output (VOUT ≥90% nominal) with 100kΩ pull-up; sinks 4mA when asserted low. |
| 3 EN/SYNC | Enable & External Clock Input | Pull high ≥1.2V to enable; accept 300kHz–1.4MHz external clock for EMI reduction and multi-rail synchronization. |
| 4,5,6 IN | Main Input Supply | Accepts 4.5V–25V; requires local 22µF low-ESR ceramic capacitor; shared high-current path for input filtering. |
| 7 N/C | No Connect | Not internally bonded; must remain unconnected and unrouted on PCB. |
| 8,9,10 SW | Switch Node Output | High dv/dt node connecting to inductor; requires minimized trace area and separation from sensitive analog nodes (FB, PG). |
| 11 BST | Bootstrap Capacitor Terminal | Connects to SW via 0.1–1µF ceramic capacitor; supplies floating gate drive voltage for external low-side MOSFET. |
| 12 VCC | Internal Regulator Bias Supply | Internally regulated ~5V; requires 1µF ceramic decoupling; powers gate driver and internal circuitry. |
| 13 BG | Bootstrap Gate Driver Output | Drives gate of external synchronous MOSFET; sink/source impedances 1Ω/4Ω ensure fast turn-on/turn-off. |
| 14 GND + Exposed Pad | Ground Reference & Thermal Path | Primary ground return and thermal interface; exposed pad must be soldered to solid GND plane for θJA = 48°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronizable gate driver | EN/SYNC pin accepts external clock up to 1.4MHz - enables deterministic EMI management and multi-phase interleaving. |
| Integrated high-side MOSFET | 60mΩ RDS(on) at 10A - eliminates external high-side switch, reducing BOM count and board area in POL designs. |
| Current-mode control | Peak-current sensing with 20mV trip threshold - delivers fast transient response (<10µs) and stable loop compensation with minimal external parts. |
| Robust fault protection | Cycle-by-cycle OCP (12A), latch-off UVLO (FB <0.25V), thermal shutdown (150°C), and UVLO hysteresis (880mV) - ensures safe operation under fault conditions without external supervision. |
| Low-ESR ceramic capacitor support | Stable with X5R/X7R ceramics - eliminates need for bulk electrolytics, improving reliability and reducing footprint in thin-profile consumer devices. |
Applications
| Point-of-Load Regulation | Digital Set-Top Box Power |
|---|---|
|
Use Scenario: Providing clean, tightly regulated 1.2V/3.3V/5V rails to SoC, DDR memory, and tuners in cable/satellite STBs. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing core logic voltage with dynamic load steps up to 8A. Use Value: Delivers 95% peak efficiency at 10A, minimizing thermal impact in sealed enclosures while supporting standby <10µA shutdown current. |
Use Scenario: Powering video processing ASICs and HDMI transceivers requiring low-noise, ripple-free 1.8V and 2.5V supplies. IC Role / Device Role / Timing Role: Secondary POL regulator synchronized to system clock to avoid beat frequencies in audio/video signal paths. Use Value: Synchronizable 600kHz operation eliminates heterodyne noise in analog video outputs and reduces conducted EMI in FCC-compliant designs. |
| Personal Video Recorder | Broadband Communications |
|
Use Scenario: Supplying 12V-to-5V conversion for HDD spindle motor drivers and SATA controllers in DVR/NVR units. IC Role / Device Role / Timing Role: High-current buck stage preceding local LDOs, handling pulsed 6–10A loads during disk spin-up. Use Value: Cycle-by-cycle OCP prevents HDD brownout during startup surges; thermal shutdown avoids sustained overtemperature in fanless enclosures. |
Use Scenario: Generating 3.3V for Ethernet PHYs and 1.2V for packet processors in DSL/cable modems and ONTs. IC Role / Device Role / Timing Role: Isolated POL regulator operating from 12V intermediate bus, with PG signal enabling firmware-controlled power sequencing. Use Value: Power Good indicator enables safe boot sequence initiation only after stable 3.3V rail is confirmed, preventing PHY initialization failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | Lower 6A rating, 2.5–36V input, no external gate driver - integrates both high- and low-side MOSFETs. | Targeted at lower-power applications where board space is critical but 10A capability is unnecessary. | Select when full integration (no external MOSFET) and wider VIN range outweigh need for programmable output and gate driver flexibility. |
| LM5116MHX/NOPB | Controller-only (no integrated MOSFET), 6–100V input, adjustable frequency 50kHz–1MHz, requires external high- and low-side drivers. | Suitable for high-input-voltage industrial or telecom systems where 25V max VIN is insufficient. | Select when input exceeds 25V or when discrete MOSFET optimization (e.g., SiC, GaN) is required for ultra-high efficiency or thermal performance. |
Compared with MP2315DJ-LF-Z, MP38671DL-LF-Z delivers 67% higher output current and gate driver flexibility for optimized low-side MOSFET selection; versus LM5116MHX/NOPB, it reduces component count and layout complexity by integrating the high-side switch and bias regulator - ideal for cost- and space-sensitive consumer POL designs.
Availability
MP38671DL-LF-Z is available at Aetrix Electronics and suitable for digital set-top boxes, personal video recorders, broadband communications equipment, and flat-panel display power systems requiring stable component supply, RoHS compliance, and long-term production continuity.
Supply support for MP38671DL-LF-Z 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 MP38671 belongs to MPS's high-current synchronous buck controller product line, designed specifically for compact, high-efficiency point-of-load regulation in space-constrained consumer electronics where thermal performance and EMI control are critical.
FAQ
What is the minimum recommended output capacitance for stable operation?
The MP38671DL-LF-Z is stable with low-ESR ceramic capacitors as small as 22µF, provided they meet ripple current ratings and use X5R/X7R dielectrics. For 10A loads, a 47µF–100µF 0805/1206 ceramic stack is typical; ESR should be ≤5mΩ to maintain phase margin above 45° across temperature.
Can the MP38671DL-LF-Z operate without an external synchronous MOSFET?
No - the MP38671DL-LF-Z requires an external low-side MOSFET driven by the BG pin. It integrates only the high-side switch; omitting the external MOSFET disables freewheeling path, causing immediate failure. Schottky diode substitution is not supported and violates absolute maximum ratings.
How does the EN/SYNC pin function during synchronization mode?
When an external clock is applied to EN/SYNC, the internal oscillator locks to its rising edge. The MP38671 maintains 100% duty-cycle capability and preserves all protections (OCP, thermal, UVLO); frequency deviation is limited to ±1% of external clock, ensuring deterministic timing in multi-rail systems.
What is the purpose of the N/C pin (Pin 7), and can it be tied to GND?
Pin 7 is unconnected internally and must remain floating - tying it to GND or any other net may cause unpredictable behavior or damage due to potential internal bond-wire shorts. Layout guidelines require keeping this pin un-routed and excluded from copper pours.
Does the MP38671DL-LF-Z support output voltages below 0.8V?
No - the internal 0.808V reference sets the absolute lower limit. Attempting sub-0.8V regulation via resistor divider scaling violates feedback accuracy and causes instability; the device will not regulate correctly and may enter latch-off mode under light load.
How is thermal performance affected if the exposed pad is not soldered to GND?
Without solder connection to a thermal GND plane, θJA degrades from 48°C/W to >100°C/W, causing junction temperature to exceed 125°C at just 4–5A load - triggering thermal shutdown. Reflow profile must ensure >90% solder coverage on the 2.9×3.1mm exposed pad per JEDEC MO-229 standards.
MP38671DL-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 14-VFDFN 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):
- 25V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 10A
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-QFN (3x4)
MP38671DL-LF-Z FAQ
1.How can I place an order for MP38671DL-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP38671DL-LF-Z 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 MP38671DL-LF-Z reliable?
The price and inventory of MP38671DL-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP38671DL-LF-Z is usually 5 days.
3.What payment methods are accepted for MP38671DL-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP38671DL-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP38671DL-LF-Z?
MP38671DL-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP38671DL-LF-Z 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 MP38671DL-LF-Z?
For technical support, including MP38671DL-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP38671DL-LF-Z requirements.
6.How does Aetrix verify that MP38671DL-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP38671DL-LF-Z 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 MP38671DL-LF-Z meets industry standards.
7.What is the process for return or replacement of MP38671DL-LF-Z?
All MP38671DL-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP38671DL-LF-Z, 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 MP38671DL-LF-Z part is unused and in its original packaging.
Return procedure for MP38671DL-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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