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

Monolithic Power Systems Inc. MP38892DN-LF-Z

Name: MP38892DN-LF-Z
Brand: Monolithic Power Systems Inc.
SKU: MP38892DN-LF-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP38892DN-LF-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

Datasheet:: MP38892DN-LF-Z.pdf

Description:: IC REG BUCK ADJ 6A 8SOICE

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Product details

Overview

MP38892DN-LF-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated 100mΩ high-side MOSFET and external gate driver for low-side FET control. It delivers 6A continuous output current across 4.5V–42V input, features ±1.5% V_FB accuracy, fixed 420kHz switching frequency, and synchronizable operation up to 1.5MHz-used in flat-panel TV power rails requiring stable 3.3V/6A conversion.

For engineers reviewing the MP38892DN-LF-Z datasheet, MP38892DN-LF-Z pinout, MP38892DN-LF-Z application, or MP38892DN-LF-Z equivalent, key selection criteria include its 42V max input rating, thermal shutdown at 150°C, cycle-by-cycle overcurrent protection with latch-off, EN/SYNC dual-function pin, and SOIC-8E exposed-pad package optimized for high-current thermal management.

Technical Context

The MP38892 operates in fixed-frequency peak-current-mode control with internal 0.8V reference and error amplifier driving COMP voltage for PWM duty cycle regulation. Its architecture integrates a 5V internal regulator (powered from VIN) to bias the bootstrap driver and gate circuits, supporting full-input-range operation down to 4.5V.

It implements synchronized floating gate drive via BST capacitor between SW and BST pins, with UVLO on the bootstrap supply (2.2V rising threshold), and combines cycle-by-cycle current limiting (8A typ) with output undervoltage foldback (triggered below 0.25V on FB) leading to latched shutdown-cleared only by EN or VIN recycle.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 42V - supports wide industrial and automotive input rails without pre-regulation
Output Current	6A continuous - enables single-chip 3.3V/6A rail for SoC or FPGA core supplies
Switching Frequency	Fixed 420kHz - balances efficiency and EMI; synchronizable from 300kHz to 1.5MHz
Feedback Accuracy	±1.5% at V_FB = 0.8V - ensures tight output regulation under line/load transients
High-Side R_DS(ON)	100mΩ - reduces conduction loss at 6A, enabling >90% efficiency with proper layout
Thermal Shutdown	150°C with 140°C hysteresis - protects against sustained overload or poor heatsinking
UVLO Threshold	Rising: 4.1V, Hysteresis: 880mV - prevents erratic startup during brownout conditions

Pinout & Package

The MP38892DN-LF-Z is housed in a thermally enhanced 8-pin SOIC package with exposed pad (SOIC8E), rated for –40°C to +85°C ambient operation and featuring θ_JA = 50°C/W on a 4-layer PCB.

Pin/Terminal	Circuit Role	Design Meaning
1 SW	Switch Node Output	Drives external inductor; connects to BST capacitor and low-side MOSFET source
2 BST	Bootstrap Supply	Provides floating gate drive voltage for high-side switch; requires 0.1–1µF ceramic cap to SW
3 VCC	BG Driver Bias Supply	Internal 5V regulator output; must be decoupled with 1µF ceramic to GND
4 BG	Gate Driver Output	Sinks/sources current to drive external low-side MOSFET gate (R_SOURCE = 4Ω, R_SINK = 1Ω)
5 GND	Power & Signal Ground	Reference for FB, EN/SYNC, and VCC; exposed pad must be soldered to PCB ground plane
6 FB	Feedback Input	Senses output voltage via resistor divider; internal 0.8V reference sets regulation point
7 EN/SYNC	Enable & Sync Input	Active-high enable; accepts external clock (300kHz–1.5MHz) for EMI reduction
8 IN	Main Power Input	Accepts 4.5V–42V unregulated input; requires local 22µF ceramic input capacitor

Key Features

Feature	Design Value
Synchronizable gate driver	Enables multi-phase or noise-sensitive system clock alignment up to 1.5MHz
Cycle-by-cycle OCP with latch-off	Prevents thermal runaway during short-circuit by disabling output until EN/VIN recycle
Stable with low-ESR ceramics	Eliminates need for electrolytic output capacitors-reducing board area and improving reliability
Integrated 100mΩ high-side MOSFET	Reduces BOM count and PCB footprint vs. controller-only solutions requiring external high-side switch
Internal soft-start (0–1.2V ramp)	Prevents output overshoot and inrush current during power-up of downstream logic

Applications

Digital Set-Top Box Power

Personal Video Recorder (PVR) Core Rail

Use Scenario: Providing stable 3.3V/6A supply to MPEG decoder SoC and memory interface in cable/satellite STBs.

IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated core voltage; operates at fixed 420kHz to avoid interference with video clock domains.

Use Value: Integrated high-side MOSFET and gate driver eliminate discrete power stage components, reducing solution size by >30% versus controller+MOSFET designs.

Use Scenario: Generating 3.3V rail for HDD controller ASIC and buffer memory in PVR systems with burst write loads.

IC Role / Device Role / Timing Role: Synchronous step-down converter with fast transient response (current-mode control) to maintain regulation during 0→6A load steps.

Use Value: ±1.5% V_FB accuracy and 6A capability ensure consistent timing margin for DDR interface clocks under dynamic load.

Broadband Gateway Power

Flat Panel Monitor Logic Supply

Use Scenario: Delivering 3.3V/6A to multi-core broadband processor and Gigabit Ethernet PHY in DOCSIS 3.1 gateways.

IC Role / Device Role / Timing Role: Main DC/DC converter with EN/SYNC pin used to synchronize switching to system master clock, minimizing conducted EMI.

Use Value: 42V max input withstands PoE+ surge events and long cable drops in telecom infrastructure applications.

Use Scenario: Supplying 3.3V logic rail to timing controller (TCON) and LVDS transmitter in 24-inch LCD monitors.

IC Role / Device Role / Timing Role: Fixed-frequency buck regulator operating at 420kHz-selected to avoid audible noise in panel backlight drivers.

Use Value: Exposed-pad SOIC8E package enables direct thermal coupling to heatsink, sustaining 6A output at 50°C ambient without derating.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPQ38892-AEC1	Automotive-grade variant with AEC-Q100 qualification, same pinout and electrical specs	Required for automotive infotainment head units; wider temp range (–40°C to +125°C)	Select when functional safety or extended temperature compliance is mandatory
MP2332HGTL-P	3A-rated, 4.5–36V input, no external gate driver; integrated low-side MOSFET	Suitable for lower-current applications where external FET control is unnecessary	Choose for cost-sensitive 3A designs where gate driver flexibility is not needed

Compared with MPQ38892-AEC1, the MP38892DN-LF-Z lacks automotive qualification but offers identical performance at lower cost for industrial use; versus MP2332HGTL-P, it trades off integration for higher current and external FET control-critical for optimizing efficiency above 4A.

Availability

MP38892DN-LF-Z is available at Aetrix Electronics and suitable for digital set-top boxes, personal video recorders, and flat-panel monitor logic supplies requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP38892DN-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 Kirkland, WA, with global design and support operations.

The MP38892 belongs to MPS's high-current synchronous buck converter product line, designed specifically for industrial and consumer applications demanding compact, efficient, and robust 3–6A DC/DC solutions with wide input voltage tolerance.

FAQ

What is the minimum recommended input capacitance for MP38892DN-LF-Z?

A 22µF X5R/X7R ceramic capacitor is specified for 6A output applications to suppress input ripple and limit surge current. This value assumes typical PCB layout; larger capacitance may be needed if input source impedance exceeds 50mΩ at 420kHz.

Can MP38892DN-LF-Z operate without an external bootstrap diode?

Yes-it uses internal bootstrap charging via D1, M3, and C4 (per Figure 2). An external IN4148 diode is optional and only recommended for high-duty-cycle applications (V_OUT/V_IN > 65%) like 5V-out from 7V-in to improve efficiency by ~1.2%.

How does the MP38892 handle output short-circuit faults?

Under short-circuit, FB voltage drops below 250mV, triggering oscillator foldback (to ~115kHz) and eventual latch-off when output UV threshold is crossed. Recovery requires cycling EN or VIN-no automatic retry to prevent thermal damage.

Is the exposed pad on MP38892DN-LF-Z electrically connected to GND?

Yes-the exposed pad is internally tied to the GND terminal (Pin 5) and must be soldered to a dedicated PCB ground plane. Failure to connect it degrades thermal performance and may cause premature thermal shutdown at <4A load.

What is the maximum achievable efficiency with MP38892DN-LF-Z at 12V_IN/3.3V_OUT/6A?

Typical efficiency reaches 94–95% at 12V_IN/3.3V_OUT/6A with optimal layout, 4.3µH shielded inductor, and low-R_DS(ON) external low-side MOSFET (e.g., Si2302). Efficiency drops to ~90% at 42V_IN due to higher switching losses.

Does MP38892DN-LF-Z support forced PWM mode at light loads?

No-it operates exclusively in peak-current-mode control with fixed frequency. Light-load efficiency relies on reduced switching losses from low quiescent current (0.9mA typ), not pulse-skipping or burst mode.

MP38892DN-LF-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

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):: 42V

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

Voltage - Output (Max):: 37.8V

Current - Output:: 6A

Frequency - Switching:: 420kHz

Synchronous Rectifier:: No

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOICE

MP38892DN-LF-Z FAQ

1.How can I place an order for MP38892DN-LF-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP38892DN-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 MP38892DN-LF-Z reliable?

The price and inventory of MP38892DN-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 MP38892DN-LF-Z is usually 5 days.

3.What payment methods are accepted for MP38892DN-LF-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP38892DN-LF-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP38892DN-LF-Z?

MP38892DN-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP38892DN-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 MP38892DN-LF-Z?

For technical support, including MP38892DN-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP38892DN-LF-Z requirements.

6.How does Aetrix verify that MP38892DN-LF-Z is sourced from the original manufacturer or authorized distributors?

All MP38892DN-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 MP38892DN-LF-Z meets industry standards.

7.What is the process for return or replacement of MP38892DN-LF-Z?

All MP38892DN-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP38892DN-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 MP38892DN-LF-Z part is unused and in its original packaging.

Return procedure for MP38892DN-LF-Z:

1.Submit a request within 90 days.

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

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