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

Monolithic Power Systems Inc. MP4566DD-LF-P

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

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Part No.:: MP4566DD-LF-P

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-TFDFN Exposed Pad

Datasheet:: MP4566DD-LF-P.pdf

Description:: IC REG BUCK ADJ 600MA 8QFN

Quantity:: RFQ Add To RFQ list

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Inventory:1,642

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Product details

Overview

MP4566DD-LF-P from Monolithic Power Systems is a non-synchronous step-down DC/DC converter with integrated 450mΩ high-side MOSFET, delivering up to 0.6A output current at fixed 1MHz switching frequency, operating from 4.5V to 36V input, and featuring 35μA quiescent current for automotive and battery-powered systems.

For engineers reviewing the MP4566DD-LF-P datasheet, MP4566DD-LF-P pinout, MP4566DD-LF-P application, or MP4566DD-LF-P equivalent, key selection criteria include its wide VIN range, internal soft-start, precision current limit without external sense resistor, +1.0V FB reference, and QFN8 thermal performance in space-constrained designs.

Technical Context

The MP4566DD-LF-P employs peak current-mode control with internal compensation, enabling fast transient response and stable operation with ceramic output capacitors. Its pulse-skipping mode reduces switching and gate-drive losses at light loads, achieving up to 77% efficiency at 1mA.

Functional block integration includes a 2.6V internal regulator powered across full VIN range, bootstrap charging circuitry with UVLO protection on BST, and dedicated EN pin with 1.8V rising threshold and 1.15V falling threshold for precise enable/disable control.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4.5V to 36V - supports automotive battery transients and industrial unregulated rails
Output Current	0.6A max - sufficient for powering microcontrollers, sensors, and interface ICs
Switching Frequency	Fixed 1MHz - enables compact magnetics and EMI filtering above AM band
Quiescent Current	35μA - extends battery life in always-on monitoring applications
FB Reference Voltage	+1.0V ±3% - allows precise output regulation from 1.0V to 0.8×VIN via resistive divider
Internal MOSFET R_DS(on)	450mΩ - minimizes conduction loss at rated load without external switch
Thermal Shutdown	150°C - provides fault-tolerant operation under sustained overload or poor PCB heatsinking

Pinout & Package

The MP4566DD-LF-P is housed in a thermally enhanced 2mm × 3mm QFN-8 package with exposed thermal pad, optimized for low θ_JA (80°C/W) and high power density in compact layouts.

Pin/Terminal	Circuit Role	Design Meaning
1 BIAS	Internal bias rail supply	Provides regulated current to internal circuitry when V_BIAS > 2.9V; improves startup reliability under low-VIN conditions
2 BST	Bootstrap supply for high-side driver	Requires 0.1–1μF capacitor to SW; enables floating gate drive for integrated MOSFET
3 SW	Switch node	Connects to inductor and external Schottky diode; high dv/dt node requiring tight layout and local decoupling
4 VIN	Main input supply	Supplies control logic, BST regulator, and high-side switch; requires local 10μF ceramic bypass
5 EN	Enable control input	High-true logic: >1.8V enables, <1.15V disables; internally pulled up when floating
6 GND	Power and signal ground	Must be connected directly to thermal pad and output capacitor negative; separates noisy switch return from FB path
7 FB	Feedback input	Compares output voltage (via resistive divider) against internal 1.0V reference; sets regulation point and loop stability
8 NC	No connect	Not internally bonded; must remain unconnected per design

Key Features

Feature	Design Value
Internally compensated current-mode control	Eliminates external compensation components while maintaining stability with 22μF ceramic output capacitors
Precision cycle-by-cycle current limit	1.2A typical limit without external sense resistor - simplifies BOM and improves overcurrent accuracy
Frequency fold-back during start-up	Prevents inductor current runaway by reducing f_SW before full regulation is established
Internal soft-start with reference ramp	0.5ms FB voltage ramp - prevents output overshoot and inrush into large capacitive loads
Low shutdown current	<2μA - enables ultra-low-power system sleep modes in portable and telematics applications

Applications

Automotive Body Control Module

Notebook System Rail Generation

Use Scenario: Powering MCU, CAN transceiver, and door-lock actuators from 12V battery with cold-crank tolerance.

IC Role / Device Role / Timing Role: Primary 3.3V/0.6A buck regulator supplying core logic and communication peripherals.

Use Value: 4.5V–36V input range survives load-dump and cranking events; 35μA I_Q preserves battery during vehicle-off state.

Use Scenario: Generating 1.8V or 3.3V for USB-C PD controller, touchpad MCU, and sensor hub in thin client design.

IC Role / Device Role / Timing Role: Secondary buck converter for low-noise, low-quiescent auxiliary rails.

Use Value: Fixed 1MHz f_SW allows small 3.3μH inductor; QFN8 footprint saves board area in height-constrained clamshell form factors.

Industrial IoT Sensor Node

Portable Medical Monitor

Use Scenario: Battery-powered environmental sensor node with BLE radio, ADC, and EEPROM requiring long field deployment.

IC Role / Device Role / Timing Role: Main system regulator converting 9V primary cell or 2S Li-ion to 3.3V logic rail.

Use Value: 77% efficiency at 1mA enables multi-year operation; thermal shutdown protects against enclosure overheating.

Use Scenario: Handheld vital-sign monitor using AA batteries, requiring reliable 3.3V supply for OLED display and analog front-end.

IC Role / Device Role / Timing Role: High-efficiency step-down regulator supporting both active measurement and standby modes.

Use Value: Pulse-skipping mode maintains >70% efficiency down to 100μA load; EN pin enables synchronized deep-sleep wake-up.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MP2451DT-LF-Z	Same 36V input, but 0.6A rating with 2MHz f_SW and higher 100μA I_Q	Better suited for ultra-compact designs needing smaller inductors; less optimal for battery longevity	Select when board area is critical and light-load runtime is secondary
LMR36006QDDARQ1	Automotive-grade AEC-Q100, 60V input, 0.6A, 35μA I_Q, but requires external compensation	Required for ASIL-B safety-compliant automotive modules; adds design complexity	Select only when automotive qualification and extended input range are mandatory

Compared with MP2451DT-LF-Z, MP4566DD-LF-P delivers superior light-load efficiency and lower EMI due to 1MHz operation; versus LMR36006QDDARQ1, it offers simpler layout and faster time-to-market at the cost of AEC-Q100 compliance.

Availability

MP4566DD-LF-P is available at Aetrix Electronics and suitable for automotive body electronics, industrial IoT sensor nodes, notebook auxiliary rails, and portable medical devices requiring stable component supply across extended temperature and input voltage ranges.

Supply support for MP4566DD-LF-P 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 MP4566 belongs to MPS's high-voltage DC/DC converter product line, engineered for robust operation in automotive and industrial environments where wide input range, low quiescent current, and thermal resilience are essential.

FAQ

What is the minimum recommended output capacitance for stable operation?

The MP4566DD-LF-P is stable with ceramic output capacitors as low as 22μF. Its internal compensation and current-mode architecture eliminate the need for ESR-based damping, allowing use of low-ESR X5R/X7R ceramics without oscillation risk. For best transient response, place the capacitor within 5mm of the FB and GND pins.

Can the MP4566DD-LF-P operate with an input voltage below 4.5V?

No - the device incorporates a 4.2V UVLO rising threshold with 0.4V hysteresis, meaning it will not start or sustain regulation below ~3.6V. Operation below 4.5V violates the Recommended Operating Conditions and may result in erratic switching or failure to regulate. For sub-4.5V inputs, consider the MPQ4566 variant with extended low-VIN capability.

Is an external bootstrap diode required for proper operation?

An external bootstrap diode (e.g., IN4148) is optional and recommended only when V_OUT ≥ 3.3V and duty cycle exceeds 65% (i.e., V_IN/V_OUT > 1.5), as it improves BST capacitor recharge efficiency. In standard 12V→3.3V or 24V→5V configurations, the internal bootstrap regulator suffices without added components.

How does the MP4566DD-LF-P handle short-circuit conditions?

Under short-circuit, the MP4566DD-LF-P enters hiccup mode: it limits peak switch current to ~1.2A, shuts down after ~500μs of overcurrent, waits ~20ms, then attempts restart. This cycle repeats until fault clears. The internal soft-start reference tracks FB during recovery, preventing output voltage overshoot upon re-regulation.

What is the maximum allowable junction temperature during continuous operation?

The absolute maximum junction temperature is 150°C, but the Recommended Operating Condition specifies +125°C as the maximum continuous T_J. Thermal shutdown activates at ~150°C and releases at ~135°C. For reliable 24/7 operation, maintain T_J ≤ 125°C using the exposed thermal pad, ≥100mm² copper pour, and minimal θ_JA layout.

Does the MP4566DD-LF-P support adjustable switching frequency?

No - the oscillator is factory-trimmed to a fixed 1MHz nominal frequency (800–1200kHz over process/temperature). There is no external pin or register to adjust f_SW. This ensures consistent EMI profile and inductor sizing across production lots, simplifying certification and layout reuse.

What is the purpose of the BIAS pin, and how should it be connected?

The BIAS pin supplies regulated current to internal analog blocks when V_BIAS > 2.9V. It may be left unconnected in most applications, as the IC draws bias from VIN. However, connecting BIAS to a clean 3.3V or 5V rail (if available) improves reference stability and startup margin under low-VIN or high-temperature conditions.

MP4566DD-LF-P 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-P FAQ

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

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

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

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your MP4566DD-LF-P 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-P?

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

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

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

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

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

Return procedure for MP4566DD-LF-P:

1.Submit a request within 90 days.

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

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