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Monolithic Power Systems Inc. MP38875DL-LF-Z
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- Part No.:
- MP38875DL-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 20-PowerVFQFN
- Datasheet:
-
MP38875DL-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 15A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,204
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Product details
Overview
MP38875DL-LF-Z from Monolithic Power Systems is a synchronous step-down DC-DC converter IC with integrated 25mΩ high-side MOSFET and external low-side gate driver, delivering 15A continuous output current across 4.5V–16V input range, fixed 800kHz switching frequency, ±2% feedback voltage accuracy, and phase-shift synchronization capability for multi-phase designs. It targets high-density power rails in telecom baseband cards and FPGA core supplies.
For engineers reviewing the MP38875DL-LF-Z datasheet, MP38875DL-LF-Z pinout, MP38875DL-LF-Z application, or MP38875DL-LF-Z equivalent, key selection criteria include its 15A output capability with internal power switch, synchronous gate driver interface (GATE pin), dual-phase sync architecture (SYNCIN/SYNCOUT), and thermal shutdown at 150°C - all critical for compact, high-current point-of-load regulation.
Technical Context
The MP38875DL-LF-Z implements peak current-mode control with a fixed 800kHz oscillator and supports external synchronization from 300kHz to >1MHz via SYNCIN. Its error amplifier compares FB voltage against a precise 0.810V internal reference and drives COMP to regulate duty cycle using an external RC network.
It integrates a 5V internal regulator for biasing analog circuitry and employs a bootstrap-driven floating gate driver (BST pin) with non-overlap timing (Td1/Td2 = 10ns) to drive external low-side MOSFETs. Protection includes cycle-by-cycle current limiting (21A typ), UVLO (4.1V rising threshold), and thermal shutdown with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16V - supports 5V, 12V, and 15V intermediate bus architectures without pre-regulation. |
| Output Current | 15A continuous - enables single-chip core supply for mid-range FPGAs and ASICs. |
| Switching Frequency | 800kHz fixed (or externally synchronized 300kHz–1MHz) - balances efficiency, size, and EMI in space-constrained PCBs. |
| Feedback Accuracy | ±2% at 0.810V - ensures tight output regulation under load transients and temperature variation. |
| High-Side RDS(on) | 25mΩ - reduces conduction loss and thermal stress at full 15A load. |
| Thermal Shutdown | 150°C junction - protects against sustained overload or inadequate heatsinking in sealed enclosures. |
| Sync Capability | Synchronous operation with 180° phase shift via SYNCIN/SYNCOUT - cuts input ripple current by ~70% in two-phase configurations. |
Pinout & Package
MP38875DL-LF-Z is housed in a thermally enhanced 20-pin 3mm × 4mm QFN package with exposed thermal pad (Pin 10/18). The package supports high-power dissipation via PCB copper area connection to the exposed pad and requires reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Bias supply for gate driver and internal regulator | Must be decoupled with ≥1µF ceramic capacitor; powers bottom gate driver and analog blocks. |
| SYNCOUT (Pin 2) | Master timing output | 50% duty, 180° out-of-phase logic signal to synchronize slave phase in interleaved design. |
| SYNCIN (Pin 3) | External clock input | Accepts 300kHz–1MHz TTL/CMOS clock; overrides internal oscillator when asserted. |
| EN (Pin 4) | Enable control | Active-high logic; 2V threshold enables device; 0.4V threshold disables with <0.1µA shutdown current. |
| SS/TRK (Pin 5) | Soft-start and voltage tracking input | Charged by 8µA internal current source; enables controlled ramp-up and sequencing with other rails. |
| FB (Pin 6) | Feedback node | Compares output voltage divider against 0.810V reference; sets VOUT = 0.81 × (1 + R1/R2). |
| COMP (Pin 7) | Error amplifier output | Drives external RC compensation network; determines loop stability and transient response. |
| PG (Pin 8) | Power good open-drain flag | Asserts high-Z when VOUT is within ±10% of target; 20µs delay on fault detection. |
| BST (Pin 9) | Bootstrap supply for high-side driver | Connected between SW and BST; forms floating rail to drive external low-side MOSFET gate above SW. |
| VIN (Pins 10, 18, Exposed Pad) | Main input power | Carries full input current; must connect to low-impedance plane; exposed pad improves θJA to 48°C/W. |
| SW (Pins 11–17) | Switch node | Fused high-current path to inductor; carries pulsed 15A+ current; requires short, wide PCB trace. |
| GATE (Pin 19) | Low-side MOSFET gate driver output | Sinks 1Ω / sources 4Ω; drives external N-channel MOSFET gate with programmable dead-time. |
| GND (Pin 20) | Analog and power ground | Reference for FB, COMP, and PG; must tie to VIN return near input capacitor to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side MOSFET | 25mΩ RDS(on) eliminates external high-side switch and reduces BOM count in single-phase designs. |
| Synchronous gate driver (GATE pin) | 1Ω sink / 4Ω source impedance enables fast, low-loss turn-on/turn-off of external low-side MOSFETs up to 30V VDS. |
| Phase-shift synchronization | SYNCIN/SYNCOUT pins support precise 180° interleaving - reduces input RMS current and eases input capacitor selection. |
| Programmable soft-start & tracking | SS/TRK pin accepts external capacitor or voltage reference to coordinate startup timing with other regulators in multi-rail systems. |
| Robust protection suite | Cycle-by-cycle current limit (21A), thermal shutdown (150°C), UVLO (4.1V), and PG flag ensure safe operation under fault conditions. |
Applications
| Telecom Baseband Processing | FPGA Core Supply |
|---|---|
|
Use Scenario: Powering multi-core DSPs and ADC/DAC interfaces in 4G/LTE remote radio units with strict thermal and space constraints. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering stable 1.2V/15A to baseband ASICs; synchronized to system clock via SYNCIN for EMI reduction. Use Value: 800kHz fixed frequency enables small 0.72µH inductor; 25mΩ RDS(on) sustains >92% efficiency at full load with minimal heatsink. |
Use Scenario: Generating configurable core voltage (0.8V–1.2V) for Xilinx Artix-7 or Intel Cyclone V FPGAs on dense carrier boards. IC Role / Device Role / Timing Role: Synchronous buck controller with SS/TRK pin enabling voltage ramp coordination with I/O bank supplies during configuration. Use Value: ±2% FB accuracy maintains FPGA core voltage within AVCC tolerance; PG flag signals configuration readiness to host processor. |
| Industrial PLC CPU Module | Automotive ADAS Domain Controller |
|
Use Scenario: Providing isolated 3.3V/15A rail for ARM Cortex-A9-based PLC CPUs operating in extended temperature (-40°C to +85°C) environments. IC Role / Device Role / Timing Role: Pre-regulator feeding linear post-regulators; EN pin enables firmware-controlled power cycling during diagnostics. Use Value: Wide 4.5V–16V input range accommodates 12V battery fluctuations; thermal shutdown prevents latch-up during ambient overtemperature events. |
Use Scenario: Dual-phase 30A supply for NVIDIA Orin SoC in autonomous driving compute modules requiring ultra-low output ripple. IC Role / Device Role / Timing Role: Master/slave interleaved configuration using SYNCOUT→SYNCIN link; COMP pins tied for automatic current balancing. Use Value: 180° phase shift cuts input ripple amplitude by 50%, allowing smaller 1206 ceramic input capacitors and reducing conducted EMI. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8770GQ-Z | Higher 20A rating, 750kHz fixed frequency, no SYNCOUT - lacks phase-shift capability. | Single-phase only; better suited for higher-current standalone rails where interleaving is unnecessary. | Select when needing >15A single-phase output and no multi-phase coordination required. |
| LM5143AQDPRRQ1 | Automotive-grade (AEC-Q100), 18V max input, 12A output, dual-channel with independent SYNC - adds channel flexibility but lower current per channel. | Designed for automotive infotainment and ADAS; includes enhanced fault reporting and diagnostic registers. | Select for automotive production programs requiring AEC-Q100 qualification and built-in diagnostics. |
Compared with MP38875DL-LF-Z, MP8770GQ-Z trades phase-shift synchronization for higher single-rail current, while LM5143AQDPRRQ1 adds automotive reliability and dual-channel control at the cost of reduced per-channel output capability and increased complexity.
Availability
MP38875DL-LF-Z is available at Aetrix Electronics and suitable for telecom baseband processing, FPGA core supply, and industrial PLC CPU modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MP38875DL-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, with expertise in DC-DC conversion, motor drivers, and LED lighting controllers.
The MP38875 belongs to MPS's high-current synchronous buck converter product line, designed specifically for compact, high-efficiency point-of-load regulation in space-constrained computing and communications platforms.
FAQ
What is the minimum recommended output capacitance for stable operation at 15A?
The MP38875DL-LF-Z is stable with low-ESR ceramic capacitors; a minimum of 47µF (e.g., 47µF × 2 in parallel) is recommended for 1.8V/15A operation. Table 3 in the datasheet specifies 47µF ceramic + 330µF POSCAP (9mΩ ESR) for optimal transient response and ripple suppression.
Can the MP38875DL-LF-Z operate without an external low-side MOSFET?
No - the MP38875DL-LF-Z integrates only the high-side MOSFET and requires an external N-channel MOSFET connected to the GATE pin for synchronous rectification. Omitting it forces discontinuous conduction mode and significantly reduces efficiency and output current capability.
How does the SS/TRK pin enable voltage tracking during startup?
When a voltage ramp (e.g., from another regulator's output) is applied to SS/TRK, the internal error amplifier reference is overridden, forcing the MP38875DL-LF-Z's output to follow that ramp. This enables precise sequencing - such as ramping core voltage before I/O voltage - without additional supervisory ICs.
What is the purpose of the exposed thermal pad (Pins 10/18) and how should it be connected?
The exposed pad serves as both electrical ground and primary thermal path. It must be soldered to a solid copper pour on the PCB, connected to GND vias (≥4× 0.3mm), and sized per MPS layout guidelines to achieve θJA = 48°C/W. Failure to do so risks thermal shutdown under sustained 15A load.
Does the MP38875DL-LF-Z support forced PWM mode at light loads?
No - the MP38875DL-LF-Z operates exclusively in peak current-mode PWM and does not include pulse-skipping or diode-emulation modes. Light-load efficiency is maintained via low quiescent current (1.0mA) and optimized gate drive, but it remains in continuous conduction down to ~200mA.
What is the maximum allowable voltage on the BST pin relative to SW?
The BST pin must remain within VSW + 6V (absolute maximum), as specified in Absolute Maximum Ratings. During normal operation with a 0.1µF BST capacitor, the voltage across BST–SW is clamped to ~5V by internal regulation - exceeding this risks damage to the bootstrap driver stage.
How is current limit set, and can it be adjusted externally?
Current limit is fixed at 21A (typical) and determined by internal sense threshold (20mV) and high-side RDS(on). It cannot be adjusted externally - protection triggers cycle-by-cycle when sensed switch current exceeds this threshold, independent of COMP voltage or FB condition.
MP38875DL-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 20-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 12V
- Current - Output:
- 15A
- Frequency - Switching:
- 800kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
MP38875DL-LF-Z FAQ
1.How can I place an order for MP38875DL-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP38875DL-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 MP38875DL-LF-Z reliable?
The price and inventory of MP38875DL-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 MP38875DL-LF-Z is usually 5 days.
3.What payment methods are accepted for MP38875DL-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP38875DL-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP38875DL-LF-Z?
MP38875DL-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP38875DL-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 MP38875DL-LF-Z?
For technical support, including MP38875DL-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP38875DL-LF-Z requirements.
6.How does Aetrix verify that MP38875DL-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP38875DL-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 MP38875DL-LF-Z meets industry standards.
7.What is the process for return or replacement of MP38875DL-LF-Z?
All MP38875DL-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP38875DL-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 MP38875DL-LF-Z part is unused and in its original packaging.
Return procedure for MP38875DL-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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