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Monolithic Power Systems Inc. MP38874DL-LF-P
- Part No.:
- MP38874DL-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 14-VFDFN Exposed Pad
- Datasheet:
-
MP38874DL-LF-P.pdf
- Description:
- IC REG BUCK ADJ 8A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,228
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Product details
Overview
MP38874DL-LF-P from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated 42mΩ high-side MOSFET and external low-side gate driver, delivering 8A continuous output current across 4.5V–21V input range, fixed 600kHz switching frequency, and adjustable 0.8V–15V output voltage - deployed in flat-panel TV power rails and broadband communication point-of-load regulation.
For engineers reviewing the MP38874DL-LF-P datasheet, MP38874DL-LF-P pinout, MP38874DL-LF-P application, or MP38874DL-LF-P equivalent, key selection considerations include synchronizable clock interface (300kHz–1.4MHz), cycle-by-cycle overcurrent protection, thermal shutdown at 150°C, power-good indicator timing behavior, and QFN14 package thermal resistance (θJA = 45°C/W).
Technical Context
The MP38874 operates in fixed-frequency peak-current-mode control with internal 0.8V reference and error amplifier driving COMP node for loop stabilization. Its architecture integrates a high-side MOSFET switch and a dedicated gate driver (BST, BG pins) to drive an external synchronous rectifier, enabling up to 95% efficiency at 8A load.
Functional blocks include UVLO (4.1V rising threshold), internal 5V VCC regulator powered from VIN, bootstrap capacitor charging circuitry with 2.2V UVLO on floating driver, and power-good comparator with 0.74V threshold and 40mV hysteresis - all implemented in a monolithic 3mm × 4mm QFN14 package with exposed thermal pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 21V - supports wide industrial and consumer input rails including 12V and 19V systems without pre-regulation. |
| Output Current | 8A continuous - enables single-chip solution for high-current PoL applications such as SoC core supplies. |
| Switching Frequency | Fixed 600kHz, synchronizable to 300kHz–1.4MHz - allows EMI reduction via spread-spectrum or multi-phase coordination. |
| Internal High-Side RDS(on) | 42mΩ - limits conduction loss at 8A to ~2.7W, enabling compact thermal design with θJA = 45°C/W. |
| Feedback Reference | 0.808V (typ) - sets output accuracy; used with external resistor divider to configure 0.8V–15V output range. |
| Power Good Threshold | 0.74V with 40mV hysteresis - provides reliable ±5% output voltage monitoring for system sequencing and fault reporting. |
| Thermal Shutdown | 150°C with 140°C restart hysteresis - protects die during overload or poor PCB heatsinking; triggers automatic recovery. |
Pinout & Package
MP38874DL-LF-P is housed in a thermally enhanced 3mm × 4mm, 14-pin QFN package with exposed thermal pad on underside. The package supports ≤2.8W continuous power dissipation at +25°C ambient and requires controlled-impedance layout for SW, IN, and GND high-current paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback Input | Connects to resistor divider midpoint; regulates output by comparing against 0.808V internal reference. |
| 2 PG | Power Good Open-Drain Output | Sinks 4mA when VOUT drops >10% below nominal; requires 100kΩ pull-up to VCC or VOUT. |
| 3 EN/SYNC | Enable & External Clock Input | Pull ≥1.2V to enable; accept 300kHz–1.4MHz external clock for synchronization. |
| 4,5,6 IN | Main Input Supply | Accepts 4.5V–21V; three parallel pins reduce trace inductance and IR drop for 8A input current. |
| 7 N/C | No Connect | Not internally bonded; must remain unconnected and un-routed. |
| 8,9,10 SW | Switch Node Output | Drives external inductor; connects to BST capacitor and high-side MOSFET source; carries full switching current. |
| 11 BST | Bootstrap Capacitor Terminal | Forms floating supply for high-side gate driver; requires 0.1–1µF ceramic capacitor to SW. |
| 12 VCC | Bias Regulator Output | 5V internal regulator output; decouple with 1µF ceramic capacitor to GND for gate driver stability. |
| 13 BG | Bottom Gate Driver Output | Drives gate of external synchronous MOSFET; sink/source impedances 1–2Ω / 4–5.5Ω ensure fast turn-on/off. |
| 14 GND | Analog & Power Ground | Reference for FB, PG, and internal circuits; must be connected to low-noise ground plane outside high-dI/dt paths. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronizable 600kHz oscillator | EN/SYNC pin accepts external clock (300kHz–1.4MHz) to align switching edges across multiple converters for EMI management. |
| Integrated 42mΩ high-side MOSFET | Reduces BOM count and layout area vs. controller-only solutions; eliminates need for external high-side driver. |
| Cycle-by-cycle overcurrent protection | Detects per-cycle switch current exceeding 9.5A (typ); prevents inductor saturation and MOSFET failure during short-circuit events. |
| Stable with low-ESR ceramic output capacitors | Eliminates need for electrolytic or tantalum caps; supports X5R/X7R MLCCs down to 10µF for compact, long-life designs. |
| Internal soft-start with 0–1.2V ramp | Prevents output overshoot and inrush current; ensures monotonic startup even under heavy capacitive loads. |
Applications
| Flat Panel Television Power Rails | Digital Set-Top Box Core Supply |
|---|---|
|
Use Scenario: Providing stable 3.3V/5V rails for display timing controllers and video processors in 4K LCD/LED TVs. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 8A continuous current with tight line/load regulation and fast transient response to dynamic video workloads. Use Value: Enables single-chip 3.3V rail generation without external high-side FET or complex compensation, reducing board area by >30% vs. discrete controller+MOSFET solutions. |
Use Scenario: Generating 1.2V core voltage for MPEG-4 decoding SoCs in cable/satellite STBs operating under variable thermal conditions. IC Role / Device Role / Timing Role: Synchronous buck converter with programmable soft-start and power-good signaling for safe SoC boot sequence and brownout detection. Use Value: Delivers 95% efficiency at 8A load with thermal shutdown at 150°C, ensuring reliability in sealed, fanless enclosures. |
| Broadband Communications Line Card | Distributed Power System Point-of-Load |
|
Use Scenario: Powering Ethernet PHYs, RF front-ends, and packet processors in DOCSIS 3.1 CMTS line cards with strict EMI requirements. IC Role / Device Role / Timing Role: Synchronizable buck regulator allowing phase alignment with other converters to suppress conducted emissions in dense PCB layouts. Use Value: Fixed 600kHz operation plus external sync capability meets CISPR-22 Class B radiated emission limits without added shielding. |
Use Scenario: Local regulation of 12V intermediate bus to 5V/3.3V for FPGA I/O banks and memory interfaces in telecom base stations. IC Role / Device Role / Timing Role: High-current PoL converter with cycle-by-cycle OCP and thermal shutdown, supporting hot-swap and redundancy schemes. Use Value: 8A output current and 4.5V–21V input range allow direct use of 12V or 19V backplane rails, eliminating intermediate conversion stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 4A rated, 2.5V–16V input, no external gate driver - integrated low-side MOSFET only. | Limited to lower-current applications; lacks BG/BST pins for external synchronous rectification. | Select when output current ≤4A and board space constraints favor fully integrated solution over efficiency optimization. |
| RT7297CHZSP | 8A rated, 4.5V–24V input, 600kHz fixed frequency, but no EN/SYNC pin or power-good output. | Missing PG signal and clock sync capability - unsuitable for systems requiring power sequencing or EMI-controlled multi-phase operation. | Choose only if PG and synchronization are not required and thermal design accommodates higher RDS(on) (55mΩ vs. 42mΩ). |
Compared with MP2315DJ-LF-Z and RT7297CHZSP, MP38874DL-LF-P uniquely combines 8A capability, external synchronous gate drive, power-good signaling, and clock synchronization - making it optimal for high-efficiency, multi-rail, EMI-sensitive PoL systems where reliability and system-level timing control are critical.
Availability
MP38874DL-LF-P is available at Aetrix Electronics and suitable for flat panel television power rails, digital set-top box core supplies, and broadband communications line card designs requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP38874DL-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 mixed-signal ICs for power management, motion control, and automotive applications.
The MP38874 belongs to MPS's high-current synchronous buck converter product line, designed specifically for efficient, compact, and robust point-of-load regulation in consumer electronics and communications infrastructure.
FAQ
What is the minimum recommended output capacitance for stable operation?
The MP38874DL-LF-P is stable with low-ESR ceramic capacitors; a minimum of 10µF X5R/X7R MLCC is recommended for 3.3V/5V outputs. For 8A loads, 22–47µF total output capacitance ensures <1% output ripple and adequate transient response under 4A/µs load steps.
Can the MP38874DL-LF-P operate without an external synchronous MOSFET?
No - the MP38874DL-LF-P requires an external low-side MOSFET driven by the BG pin. It integrates only the high-side switch; omitting the external FET disables synchronous rectification and causes catastrophic failure due to body-diode conduction and excessive heat.
How does the EN/SYNC pin behave during external clock synchronization?
When an external clock (300kHz–1.4MHz) is applied to EN/SYNC, the internal 600kHz oscillator locks to its rising edge. The pin retains enable functionality: logic-high ≥1.2V enables regulation; logic-low ≤0.4V forces shutdown regardless of clock presence.
What is the purpose of the N/C pin (Pin 7), and how should it be handled?
Pin 7 is a no-connect terminal - not bonded internally and electrically isolated. It must remain unconnected on PCB; routing traces or applying solder paste may cause mechanical stress or unintended coupling in high-frequency switching nodes.
Does the MP38874DL-LF-P support adjustable soft-start time?
No - soft-start is internal and fixed: the SS voltage ramps linearly from 0V to 1.2V over ~5ms. This duration is optimized for overshoot suppression with typical output capacitors (22–47µF); no external components adjust timing.
What is the maximum allowable BST capacitor voltage rating?
The BST capacitor must withstand ≥12V rating: during startup or light load, BST voltage can reach VIN + 5V (e.g., 21V + 5V = 26V). A 35V-rated X7R ceramic capacitor (0.1–1µF) is recommended to ensure reliability across full input and temperature range.
How does thermal shutdown interact with the power-good signal?
During thermal shutdown, the regulator halts switching and pulls PG low after a 100µs delay - providing immediate fault indication to host controllers. PG remains low until junction temperature falls below 140°C and normal regulation resumes, ensuring safe restart.
MP38874DL-LF-P 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):
- 21V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 8A
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-QFN (3x4)
MP38874DL-LF-P FAQ
1.How can I place an order for MP38874DL-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP38874DL-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 MP38874DL-LF-P reliable?
The price and inventory of MP38874DL-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 MP38874DL-LF-P is usually 5 days.
3.What payment methods are accepted for MP38874DL-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP38874DL-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP38874DL-LF-P?
MP38874DL-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP38874DL-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 MP38874DL-LF-P?
For technical support, including MP38874DL-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP38874DL-LF-P requirements.
6.How does Aetrix verify that MP38874DL-LF-P is sourced from the original manufacturer or authorized distributors?
All MP38874DL-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 MP38874DL-LF-P meets industry standards.
7.What is the process for return or replacement of MP38874DL-LF-P?
All MP38874DL-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP38874DL-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 MP38874DL-LF-P part is unused and in its original packaging.
Return procedure for MP38874DL-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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