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

Monolithic Power Systems Inc. MP4566DD-LF-Z

Name: MP4566DD-LF-Z
Brand: Monolithic Power Systems Inc.
SKU: MP4566DD-LF-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP4566DD-LF-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-TFDFN Exposed Pad

Datasheet:: MP4566DD-LF-Z.pdf

Description:: IC REG BUCK ADJ 600MA 8QFN

Quantity:: RFQ Add To RFQ list

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Inventory:2,025

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Product details

Overview

MP4566DD-LF-Z from Monolithic Power Systems is a 36V, 1MHz, 0.6A non-synchronous step-down DC/DC converter with integrated 450mΩ high-side MOSFET, 35μA quiescent current, and internal compensation. It operates across 4.5V–36V input range and delivers adjustable output from +1.0V to 0.8×VIN, targeting automotive and battery-powered systems requiring low-noise, high-efficiency power conversion.

For engineers reviewing the MP4566DD-LF-Z datasheet, MP4566DD-LF-Z pinout, MP4566DD-LF-Z application, or MP4566DD-LF-Z equivalent, key selection criteria include its 1MHz fixed-frequency current-mode control, thermal shutdown protection, frequency fold-back at startup, soft-start timing (0.5ms), and compatibility with ceramic output capacitors without external compensation.

Technical Context

The MP4566DD-LF-Z implements peak current-mode control with an internally generated 1MHz oscillator and blanking time for noise immunity during MOSFET turn-on. Its error amplifier compares FB voltage against a precise +1.0V reference, driving the COMP node to regulate inductor peak current cycle-by-cycle.

At light load, it enters pulse-skipping mode-pausing switching cycles when COMP falls below sleep threshold-to reduce gate drive and switching losses, achieving up to 77% efficiency at 1mA. Bootstrap charging relies on external BST-SW capacitor and VIN headroom during diode conduction, with dedicated UVLO (2.4V) for the floating driver.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 36V - supports automotive battery transients and wide industrial input rails
Switching Frequency	Fixed 1MHz - enables compact magnetics and EMI filtering above AM band
Output Current	0.6A continuous - sufficient for microcontroller cores, sensors, and interface ICs
Quiescent Current	35μA - extends battery life in always-on monitoring and telematics applications
Feedback Reference	+1.0V ±3% - enables accurate output regulation with standard resistor dividers
Internal MOSFET R_DS(on)	450mΩ - reduces conduction loss at mid-load, simplifies BOM vs. external FET solutions
Soft-Start Time	0.5ms - prevents output overshoot during power-up without external components
Shutdown Current	<2μA - ensures negligible drain in deep sleep or emergency cutoff modes

Pinout & Package

MP4566DD-LF-Z is housed in a thermally enhanced 2mm × 3mm QFN-8 package with exposed thermal pad, optimized for PCB heat dissipation and space-constrained designs.

Pin/Terminal	Circuit Role	Design Meaning
1 BIAS	Bias supply input	Provides internal circuitry power when V_BIAS > 2.9V; decouples controller core from noisy VIN rail
2 BST	Bootstrap supply	Drives high-side MOSFET gate via external BST–SW capacitor; requires ≥5V headroom for reliable charging
3 SW	Switch node	High-current connection to inductor and external Schottky diode; must be routed short and away from analog traces
4 VIN	Main input supply	Powers internal regulator, gate drivers, and high-side switch; requires local 10µF ceramic bypass
5 EN	Enable control	Active-high logic (1.8V threshold); floating = enabled; allows system-level power sequencing
6 GND	Power ground	Reference for all internal circuits; must connect directly to thermal pad and output capacitor negative terminal
7 FB	Feedback input	Senses output voltage via resistive divider; compared to internal 1.0V reference to regulate V_OUT
8 NC	No connect	Not bonded; left unconnected per datasheet; no routing or solder required

Key Features

Feature	Design Value
Internally compensated control loop	Eliminates need for external compensation network-reduces design risk and component count
Precision current limit without sense resistor	Accurate 0.8–1.6A cycle-by-cycle protection using integrated current-sense MOSFET
Stable with ceramic output capacitors	Enables low-ESR, small-footprint output filtering without stability trade-offs
Frequency fold-back at startup	Prevents inductor current runaway during soft-start by reducing f_SW under heavy load
Thermal shutdown with hysteresis	Shuts down at 150°C junction temperature; resumes only after cooling to ~130°C for robust fault recovery

Applications

Automotive Infotainment Power

Industrial Sensor Node Supply

Use Scenario: Powering display controllers and audio codecs in 12V vehicle systems with cold-crank (4.5V) and load-dump (36V) transients.

IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3V/0.6A to MCU peripherals and I²C/SPI interface ICs.

Use Value: 35μA quiescent current minimizes battery drain during ignition-off parking mode; 36V rating withstands ISO 7637-2 pulses.

Use Scenario: Providing regulated 1.8V or 2.5V to ultra-low-power environmental sensors and wireless transceivers in remote IIoT nodes.

IC Role / Device Role / Timing Role: Standby-optimized DC/DC converter enabling multi-year battery life in wireless sensor networks.

Use Value: Pulse-skipping mode achieves 77% efficiency at 1mA load; internal soft-start avoids wake-up glitches in duty-cycled operation.

Notebook Subsystem Rail

Automotive ADAS Camera Module

Use Scenario: Generating auxiliary 5V or 3.3V rails for USB-C PD companion chips, EC firmware, or touchpad controllers in thin-and-light notebooks.

IC Role / Device Role / Timing Role: Secondary buck converter operating from main 12V or 19V adapter input.

Use Value: 2mm×3mm QFN8 footprint saves board area; 1MHz switching allows use of ≤3.3µH inductors for minimal height.

Use Scenario: Powering image signal processors (ISPs) and MIPI PHYs in rear-view or surround-view camera modules exposed to engine bay temperatures.

IC Role / Device Role / Timing Role: High-reliability buck regulator delivering 1.2V core and 1.8V I/O rails under -40°C to +125°C junction conditions.

Use Value: Thermal shutdown and wide input range ensure operation during hot-soak and cold-start; exposed pad enhances thermal performance in sealed housings.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPQ4566DD-AEC1-LF-Z	AEC-Q100 Grade 1 qualified; identical electrical specs but extended temp range (-40°C to +125°C) and automotive qualification testing	Required for safety-critical automotive subsystems (e.g., ADAS, body control) where qualification is mandatory	Select when automotive qualification and extended junction temperature compliance are required
MP4467DQ-LF-Z	Higher 1.2A output current; 2.5MHz switching; 40V max input; uses different pinout (QFN10) and lacks BIAS pin	Suitable for higher-power loads or space-constrained designs needing faster transient response and smaller inductors	Choose when >0.6A output or >1MHz switching is needed, accepting re-layout and new compensation

Compared with MP4566DD-LF-Z, the MPQ4566DD-AEC1-LF-Z adds automotive qualification without changing functionality, while the MP4467DQ-LF-Z trades lower quiescent current and simpler layout for higher output capability and faster switching-requiring redesign but enabling denser power stages.

Availability

MP4566DD-LF-Z is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, and notebook subsystem power requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP4566DD-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 over two decades of expertise in DC/DC conversion, motor drivers, and LED lighting controllers.

The MP4566 belongs to MPS's high-voltage buck converter product line, designed specifically for automotive, industrial, and portable applications demanding wide input range, ultra-low quiescent current, and integrated reliability features.

FAQ

What is the minimum recommended input voltage for reliable startup?

The MP4566DD-LF-Z has a VIN UVLO rising threshold of 4.0V with 0.4V hysteresis. Reliable startup occurs at ≥4.2V input; operation below 4.0V disables regulation and places the device in undervoltage lockout until voltage recovers above 4.4V.

Can the MP4566DD-LF-Z operate without an external bootstrap diode?

Yes-it operates without an external bootstrap diode in most configurations. An external diode (e.g., IN4148) is only recommended when V_OUT is 3.3V or 5V and duty cycle exceeds 65%, to improve BST capacitor charging efficiency and prevent driver UVLO during high-duty operation.

How does the internal soft-start interact with the FB pin during short-circuit recovery?

During short-circuit recovery, the internal soft-start voltage (SS) tracks FB downward if FB drops, then ramps upward from that point when the fault clears-ensuring controlled, overshoot-free restart without requiring external soft-start circuitry or reset signals.

What is the maximum allowable output voltage adjustment range?

The MP4566DD-LF-Z supports output voltages from +1.0V (set by direct FB tie to GND) up to 0.8×VIN. At VIN = 36V, maximum V_OUT is 28.8V; at VIN = 4.5V, minimum regulated V_OUT remains 1.0V due to the fixed 1.0V feedback reference.

Is the NC pin (Pin 8) electrically isolated or tied internally?

Pin 8 is a true no-connect (NC) terminal-unbonded and electrically isolated within the die. It must remain unconnected on the PCB; no routing, soldering, or grounding is permitted or required per the manufacturer's package specification.

Does the MP4566DD-LF-Z require an external current-sense resistor?

No-the device integrates a precision current-sense MOSFET and comparator for cycle-by-cycle peak current limiting. No external sense resistor is needed, reducing BOM cost, board area, and power loss associated with discrete sensing.

What thermal derating applies above +85°C ambient?

With θ_JA = 80°C/W, the device dissipates ≤1.6W at T_A = +25°C. At +85°C ambient, maximum continuous power drops to (125°C − 85°C)/80°C/W = 0.5W. Layout with thermal pad soldering and copper pour is essential to maintain safe junction temperature.

MP4566DD-LF-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 8-TFDFN 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):: 36V

Voltage - Output (Min/Fixed):: 1V

Voltage - Output (Max):: 28.8V

Current - Output:: 600mA

Frequency - Switching:: 1MHz

Synchronous Rectifier:: No

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-QFN (2x3)

MP4566DD-LF-Z FAQ

1.How can I place an order for MP4566DD-LF-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP4566DD-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 MP4566DD-LF-Z reliable?

The price and inventory of MP4566DD-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 MP4566DD-LF-Z is usually 5 days.

3.What payment methods are accepted for MP4566DD-LF-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4566DD-LF-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP4566DD-LF-Z?

MP4566DD-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP4566DD-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 MP4566DD-LF-Z?

For technical support, including MP4566DD-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4566DD-LF-Z requirements.

6.How does Aetrix verify that MP4566DD-LF-Z is sourced from the original manufacturer or authorized distributors?

All MP4566DD-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 MP4566DD-LF-Z meets industry standards.

7.What is the process for return or replacement of MP4566DD-LF-Z?

All MP4566DD-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4566DD-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 MP4566DD-LF-Z part is unused and in its original packaging.

Return procedure for MP4566DD-LF-Z:

1.Submit a request within 90 days.

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

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