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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Monolithic Power Systems Inc. MP38876DL-LF-Z

Name: MP38876DL-LF-Z
Brand: Monolithic Power Systems Inc.
SKU: MP38876DL-LF-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP38876DL-LF-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 20-PowerVFQFN

Datasheet:: MP38876DL-LF-Z.pdf

Description:: IC REG BUCK ADJ 15A 20QFN

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Product details

Overview

MP38876DL-LF-Z from Monolithic Power Systems is a monolithic synchronous step-down DC-DC converter with integrated 25mΩ high-side MOSFET and external gate driver for low-side synchronous rectification. It delivers 15A continuous output current from 4.5V–28V input, supports 0.8V–12V adjustable output, and operates at fixed 400kHz or externally synchronized 300kHz–1MHz. It is used in compact PCB space-constrained power rails for FPGA, ASIC, and DSP core supplies.

For engineers reviewing the MP38876DL-LF-Z datasheet, MP38876DL-LF-Z pinout, MP38876DL-LF-Z application, or MP38876DL-LF-Z equivalent, key selection criteria include internal MOSFET R_DS(ON), programmable soft-start timing, phase-shift synchronization capability via SYNCIN/SYNCOUT, and thermal shutdown threshold at 150°C.

Technical Context

The MP38876DL-LF-Z implements peak current-mode control with a fixed 400kHz oscillator or external clock synchronization up to 1MHz. Its dual-phase interleaving support enables 30A operation when two units are synchronized via SYNCOUT→SYNCIN with 180° phase shift.

It integrates a 5V internal regulator for biasing analog circuitry and a floating bootstrap driver with UVLO (2.2V rising threshold) for the external low-side MOSFET gate. Cycle-by-cycle overcurrent protection triggers at 21A typical, and feedback accuracy is ±2% over –40°C to +85°C ambient.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 28V - Supports wide industrial and telecom input rails including 5V, 12V, and 24V systems.
Output Current	15A continuous - Sustains full load without derating at T_A ≤ +85°C with proper PCB copper area.
Switching Frequency	400kHz fixed or 300kHz–1MHz sync - Enables EMI optimization and multi-phase interleaving.
Feedback Accuracy	±2% at 25°C, ±2.5% over temperature - Ensures tight regulation for sensitive digital core supplies.
Internal High-Side R_DS(ON)	25mΩ - Limits conduction loss to <1.5W at 15A, reducing need for external heatsinking.
Thermal Shutdown	150°C junction - Protects against sustained overload or poor airflow; auto-recovery at ~140°C.
Soft-Start Time	Programmable via external capacitor - Prevents inrush current and output overshoot during power-up.
Power Good Threshold	90% ramp-up / 85% ramp-down - Provides precise sequencing signal for multi-rail systems.

Pinout & Package

MP38876DL-LF-Z is housed in a thermally enhanced 20-pin 3mm × 4mm QFN package with exposed thermal pad (Pin 10/18/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
VCC	Bias supply for gate driver and internal regulator	Requires 1µF ceramic decoupling; powers bottom gate driver and analog blocks.
SYNCOUT	Timing output for multi-phase synchronization	50% duty cycle, 180° out-of-phase logic signal to drive slave regulator SYNCIN.
SYNCIN	External clock input (300kHz–1MHz)	Enables EMI reduction and phase alignment; connect to VCC if unused.
EN	Enable/disable control input	Active-high; 2V min high threshold ensures noise immunity in noisy environments.
SS/TRK	Soft-start and voltage tracking input	Capacitor sets startup ramp time; also accepts external reference for rail sequencing.
FB	Feedback node for output voltage regulation	0.8V reference; connects to resistor divider; foldback activates below 400mV for short-circuit protection.
COMP	Error amplifier output for loop compensation	Connects to RC network; determines stability, transient response, and phase margin.
PG	Open-drain power-good indicator	Pulls low if V_OUT deviates >10%; requires 100kΩ pull-up to V_CC or V_OUT.
BST	Bootstrap capacitor connection	Forms floating supply for high-side gate driver; requires 0.1–1µF ceramic capacitor to SW.
VIN (Pins 10,18,Exposed Pad)	Main input power connection	High-current path; multiple pins reduce IR drop and improve thermal performance.
SW	Switch node output	Drives external inductor; fused across Pins 11–17 for low-inductance, high-current routing.
GATE	Gate driver output for external low-side MOSFET	Sinks 1A / sources 250mA; non-overlap time 10ns prevents shoot-through.
GND	Power and signal ground reference	Pin 20 plus exposed pad provide low-impedance return path for switching and analog circuits.

Key Features

Feature	Design Value
Synchronous gate driver with non-overlap control	10ns dead-time prevents shoot-through; 1Ω sink / 4Ω source impedance ensures fast MOSFET turn-on/off.
Phase-shift synchronization interface	SYNCIN/SYNCOUT enables two-phase interleaving with automatic current balancing via shared COMP node.
Programmable soft-start and tracking	SS/TRK pin supports both timed ramp-up and ratio-matched sequencing with other regulators.
Robust fault protection	Cycle-by-cycle current limit (21A), thermal shutdown (150°C), and UVLO (4.1V rising) ensure system reliability.
Stable with ceramic output capacitors	Optimized compensation supports low-ESR ceramics down to 10µF, eliminating bulk tantalum/electrolytic.
Integrated 5V bias regulator	Supplies internal analog circuitry across full VIN range; requires only 1µF decoupling on VCC.

Applications

FPGA Core Supply

Industrial PLC I/O Module

Use Scenario: Providing tightly regulated 1.2V/15A to Xilinx Kintex-7 FPGA banks with dynamic current demand up to 12A.

IC Role / Device Role / Timing Role: Primary buck controller with integrated high-side switch and external synchronous rectifier; delivers stable core voltage under fast load transients.

Use Value: 92% efficiency at 12A/1.2V reduces thermal load on dense BGA packages and eliminates need for forced air cooling.

Use Scenario: Generating 5V/10A for isolated I/O power in DIN-rail mounted programmable logic controllers.

IC Role / Device Role / Timing Role: Pre-regulator feeding downstream LDOs; synchronized to system clock to minimize conducted EMI in EMC-sensitive enclosures.

Use Value: SYNCIN locking to 500kHz master clock cuts input ripple by 40% versus free-running operation, easing filter design.

Telecom Baseband Processor

Automotive ADAS Domain Controller

Use Scenario: Delivering 1.8V/12A to Qualcomm QCA9377 baseband SoC in small-form-factor wireless access points.

IC Role / Device Role / Timing Role: Compact, high-density point-of-load regulator; uses SS/TRK to track memory rail during warm boot sequences.

Use Value: 3mm × 4mm QFN footprint saves >35% board area vs. discrete controller + MOSFET solutions, critical for fanless AP designs.

Use Scenario: Powering NVIDIA Orin NX SoC core voltage (1.05V/15A) in automotive camera processing modules with ASIL-B requirements.

IC Role / Device Role / Timing Role: Primary DC-DC stage with PG signaling for safety-monitoring MCU; thermal shutdown provides fail-safe shutdown under overtemperature.

Use Value: ±2% FB accuracy and 150°C thermal cutoff meet functional safety constraints for transient overvoltage and thermal fault detection.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPQ3426-AEC1	Automotive-grade (-40°C to +125°C), 12A rated, 4.5V–36V input, no SYNCOUT	Lacks phase-shift sync capability; qualified per AEC-Q100 Grade 1	Select when automotive qualification and extended temperature range are mandatory, and multi-phase sync is unnecessary.
RTQ2132B-QT	12A, 4.5V–28V, integrated dual MOSFETs, 500kHz fixed freq, no external gate driver	No GATE pin - cannot drive discrete low-side FET; lower max current	Choose for simplified layout where 12A suffices and external MOSFET optimization is not required.

Compared with MPQ3426-AEC1 and RTQ2132B-QT, MP38876DL-LF-Z uniquely combines 15A capability, external gate driver flexibility, and hardware-supported two-phase interleaving - making it optimal for high-current, space-constrained, and EMI-sensitive industrial and computing platforms.

Availability

MP38876DL-LF-Z is available at Aetrix Electronics and suitable for FPGA core supplies, industrial PLC I/O modules, and telecom baseband processors requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP38876DL-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 design centers in the US, China, and Taiwan.

The MP38876 belongs to MPS's high-current synchronous buck converter product line, engineered for compact, high-efficiency point-of-load regulation in computing, telecom, and industrial systems where thermal density and EMI control are critical.

FAQ

What is the minimum recommended output capacitance for stable operation?

The MP38876DL-LF-Z is stable with low-ESR ceramic capacitors as low as 10µF total output capacitance when paired with appropriate compensation (e.g., R3 = 2.2kΩ, C3 = 10nF for 1.2V/100µF output). For best transient response and ripple suppression, ≥47µF ceramic (X5R/X7R) is recommended. Tantalum or polymer capacitors may be used but require ESR-based compensation adjustment.

Can MP38876DL-LF-Z operate without an external low-side MOSFET?

No. MP38876DL-LF-Z integrates only a high-side power MOSFET (25mΩ) and requires an external low-side synchronous MOSFET driven by the GATE pin. It does not support diode rectification - using a Schottky diode will cause excessive loss and thermal failure at 15A. The GATE driver is optimized for N-channel MOSFETs with ≤10nC gate charge.

How is the soft-start time calculated from the SS/TRK capacitor value?

Soft-start time is determined by the internal 8µA current source charging the external capacitor: t_SS ≈ (1.2V × C_SS) / 8µA. For example, a 100nF capacitor yields ~15ms ramp time. During this period, the error amplifier reference is overridden by the SS voltage, ensuring monotonic V_OUT rise without overshoot. Tracking mode replaces this with an external voltage ramp.

What is the maximum achievable output voltage and how is it set?

The MP38876DL-LF-Z supports output voltages from 0.8V to 12V, limited by the input voltage (V_OUT ≤ V_IN – 4V). It is set using a resistor divider from V_OUT to GND, with FB referenced to an internal 0.8V bandgap. For 1.2V output, use R1 = 40.2kΩ and R2 = 40.4kΩ (1% tolerance); higher outputs require proportionally larger R2 values per the formula R2 = R1 × 0.8 / (V_OUT – 0.8).

Does MP38876DL-LF-Z support forced PWM mode or pulse-skipping at light load?

No. MP38876DL-LF-Z operates exclusively in forced continuous conduction mode (FCCM) at fixed frequency. It does not enter discontinuous conduction mode (DCM) or pulse-frequency modulation (PFM) at light loads. This ensures constant switching frequency for predictable EMI and avoids audio-band noise, but results in reduced light-load efficiency compared to PFM-capable converters.

What is the purpose of the exposed thermal pad and how should it be connected?

The exposed thermal pad (Pins 10, 18, and the center pad) is electrically connected to VIN and must be soldered to a large PCB copper pour tied to the main input power plane. This provides both electrical connection and primary thermal path - reducing θ_JA from 48°C/W to ≤35°C/W. Failure to connect it properly causes junction temperature to exceed 150°C at <10A load, triggering thermal shutdown.

How does the cycle-by-cycle overcurrent protection interact with short-circuit conditions?

Under output short-circuit, FB drops below 400mV, activating frequency foldback (reducing f_SW from 400kHz to 100kHz) to limit power dissipation. If FB remains <400mV and current exceeds 21A for >1 cycle, the device enters latch-off mode - disabling switching until EN or VIN is cycled. This prevents thermal runaway and allows safe recovery after fault removal.

MP38876DL-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):: 28V

Voltage - Output (Min/Fixed):: 0.8V

Voltage - Output (Max):: 24V

Current - Output:: 15A

Frequency - Switching:: 400kHz

Synchronous Rectifier:: No

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-QFN (3x4)

MP38876DL-LF-Z FAQ

1.How can I place an order for MP38876DL-LF-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP38876DL-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 MP38876DL-LF-Z reliable?

The price and inventory of MP38876DL-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 MP38876DL-LF-Z is usually 5 days.

3.What payment methods are accepted for MP38876DL-LF-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP38876DL-LF-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP38876DL-LF-Z?

MP38876DL-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP38876DL-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 MP38876DL-LF-Z?

For technical support, including MP38876DL-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP38876DL-LF-Z requirements.

6.How does Aetrix verify that MP38876DL-LF-Z is sourced from the original manufacturer or authorized distributors?

All MP38876DL-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 MP38876DL-LF-Z meets industry standards.

7.What is the process for return or replacement of MP38876DL-LF-Z?

All MP38876DL-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP38876DL-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 MP38876DL-LF-Z part is unused and in its original packaging.

Return procedure for MP38876DL-LF-Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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