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

Monolithic Power Systems Inc. MP38892DN-LF

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

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Part No.:: MP38892DN-LF

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.pdf

Description:: IC REG BUCK ADJ 6A 8SOICE

Quantity:: RFQ Add To RFQ list

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Inventory:1,654

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Product details

Overview

MP38892DN-LF 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 fixed 420kHz switching frequency (synchronizable up to 1.5MHz), ±1.5% V_FB accuracy, and thermal shutdown protection. Used in flat-panel TV power rails requiring stable 3.3V/5V conversion.

For engineers reviewing the MP38892DN-LF datasheet, MP38892DN-LF pinout, MP38892DN-LF application, or MP38892DN-LF equivalent, key selection criteria include input voltage range compatibility, synchronous gate drive capability, current-mode control loop stability, and SOIC8E thermal performance under 6A load conditions.

Technical Context

The MP38892DN-LF implements peak-current-mode control with internal 0.8V reference and error amplifier driving COMP node for PWM duty cycle regulation. Its oscillator operates at fixed 420kHz but accepts external sync signals from 300kHz to 1.5MHz via EN/SYNC pin with rising-edge alignment.

It integrates a 5V internal regulator (V_CC) powered from VIN, supporting gate driver bias and analog circuitry across full input range; bootstrap charging uses internal diode D1 and external capacitor between SW and BST pins to sustain floating high-side gate drive above VIN.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 42V - supports wide industrial and automotive supply rails without pre-regulation
Continuous Output Current	6A - enables single-chip solution for mid-power digital loads like SoC core rails
Feedback Voltage Accuracy	±1.5% at 0.808V - ensures tight output regulation across line/load/temperature
Switching Frequency	Fixed 420kHz, synchronizable 300kHz–1.5MHz - allows EMI tuning and multi-rail synchronization
High-Side R_DS(ON)	100mΩ - reduces conduction loss at 6A, enabling >95% efficiency with proper layout
Thermal Shutdown Threshold	150°C - protects die during overload or poor heatsinking; auto-recovery at ~140°C
UVLO Threshold	Rising: 4.10V, Hysteresis: 880mV - prevents erratic startup at marginal input voltages

Pinout & Package

MP38892DN-LF is housed in an 8-pin SOIC package with exposed thermal pad (SOIC8E), optimized for PCB heat dissipation with θ_JA = 50°C/W on 4-layer board.

Pin/Terminal	Circuit Role	Design Meaning
1 SW	Switch Node Output	Drives external inductor; connects to bootstrap capacitor and low-side MOSFET source
2 BST	Bootstrap Supply	Provides floating gate drive voltage for high-side MOSFET; requires 0.1–1µF ceramic cap to SW
3 VCC	Bias Regulator Output	5V internal supply for gate driver and analog blocks; decouple with 1µF ceramic to GND
4 BG	Bottom Gate Driver Output	Sinks/source current to drive external synchronous MOSFET gate; RSINK = 1Ω, RSOURCE = 4Ω
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 synchronized operation
8 IN	Main Power Input	Accepts 4.5V–42V unregulated supply; requires local 22µF ceramic input capacitor

Key Features

Feature	Design Value
Synchronizable switching frequency	Enables deterministic EMI reduction and multi-converter phase alignment in dense power systems
Integrated 100mΩ high-side MOSFET	Eliminates need for external high-side switch while maintaining 6A capability in SOIC8E
Cycle-by-cycle overcurrent protection	Latches off on sustained short-circuit, preventing thermal runaway without external sensing
Stable with low-ESR ceramic capacitors	Supports compact, high-reliability output filtering using X5R/X7R MLCCs instead of electrolytics
Internal soft-start ramp	Prevents output overshoot during startup by gradually increasing COMP reference from 0V to 1.2V

Applications

Digital Set-Top Box Power Rail

Personal Video Recorder Main Supply

Use Scenario: Providing regulated 3.3V/5V to MPEG decoder SoC and HDMI interface logic under variable AC-DC adapter input.

IC Role / Device Role / Timing Role: Primary buck controller managing power sequencing, transient response to burst video decoding loads, and EMI compliance.

Use Value: Fixed 420kHz frequency plus sync capability allows co-location with audio codec clocks to avoid beat frequencies.

Use Scenario: Delivering 6A at 1.2V/1.8V to dual-core ARM processor and SATA controller during HD video recording bursts.

IC Role / Device Role / Timing Role: High-current synchronous buck stage with external low-side FET for efficiency optimization at light-to-heavy load transitions.

Use Value: 100mΩ integrated high-side MOSFET and current-mode control ensure <1% load regulation across 0–6A.

Broadband Cable Modem RF Front-End

Flat Panel Monitor Logic Board

Use Scenario: Generating clean 3.3V for DOCSIS 3.1 QAM modulator ICs adjacent to sensitive RF sections.

IC Role / Device Role / Timing Role: Isolated power stage with minimized switching noise injection via optimized PCB layout and bootstrap diode option.

Use Value: Low-noise current-mode architecture and ability to add external BST diode reduce V_SW ringing affecting RF signal integrity.

Use Scenario: Powering timing controller (TCON), LVDS transmitter, and backlight LED driver from 12V/24V input bus.

IC Role / Device Role / Timing Role: Multi-rail buck controller supporting independent 3.3V, 5V, and 12V outputs via cascaded or parallel configurations.

Use Value: Wide 4.5–42V input range accommodates both 12V and 24V monitor platforms without redesign.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPQ4470AGL-Z	42V input, 8A output, 500kHz fixed frequency, no external gate drive; integrated dual MOSFETs	Higher current, no external FET required; less flexible for ultra-low-loss designs	Select when board space is constrained and external FET optimization is unnecessary
LM5116MH/NOPB	65V input, 10A capable, external high- and low-side drivers, adjustable frequency 50kHz–1MHz	Wider VIN, higher current, more complex compensation; requires external MOSFETs and bootstrap diode	Select for >42V input or when fine-grained loop tuning and higher efficiency at light load are critical

Compared with MPQ4470AGL-Z, MP38892DN-LF offers external gate drive flexibility for optimized conduction losses, while LM5116MH/NOPB provides broader input range and programmable frequency but demands more external components and design effort.

Availability

MP38892DN-LF is available at Aetrix Electronics and suitable for digital set-top boxes, personal video recorders, broadband communications equipment, and flat panel television and monitors requiring stable component supply with RoHS-compliant packaging.

Supply support for MP38892DN-LF 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 MP38892 belongs to MPS's high-voltage synchronous buck controller product line, designed specifically for industrial and consumer power supplies needing wide-input-range, high-current, and thermally robust solutions in compact packages.

FAQ

What is the minimum recommended input capacitance for MP38892DN-LF at 6A output?

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

Can MP38892DN-LF operate without an external synchronous MOSFET?

No - MP38892DN-LF requires an external low-side MOSFET driven by the BG pin. It contains only an integrated high-side switch; omitting the external FET results in open-circuit operation and no regulated output.

How does the EN/SYNC pin function during synchronization mode?

When driven by an external clock signal (300kHz–1.5MHz), the EN/SYNC pin overrides the internal oscillator; the internal PWM cycle aligns its rising edge to the external clock's rising edge, enabling precise multi-rail timing coordination.

What is the purpose of the exposed thermal pad on the SOIC8E package?

The exposed pad serves as the primary thermal path to the PCB ground plane, reducing junction-to-board thermal resistance (θ_JC = 10°C/W). It must be soldered to a solid copper area ≥100mm² for reliable 6A operation at +85°C ambient.

Does MP38892DN-LF support output voltages below 0.8V?

No - the internal reference is fixed at 0.8V, and the feedback comparator is not designed for sub-0.8V regulation. Output voltages are set by resistor divider scaling: V_OUT = 0.8V × (1 + R1/R2), with minimum practical V_OUT ≈ 0.8V.

What happens during thermal shutdown and how does recovery occur?

At 150°C junction temperature, the device disables switching and holds BG low; it remains latched off until die temperature falls to ~140°C, at which point normal operation resumes automatically without external reset.

MP38892DN-LF Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

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

Packaging:: Tube

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 FAQ

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

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

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

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

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP38892DN-LF?

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

Once your MP38892DN-LF 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?

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

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

All MP38892DN-LF 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 meets industry standards.

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

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

Return procedure for MP38892DN-LF:

1.Submit a request within 90 days.

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

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