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MP4559

1.5A, 2MHz, 55V Step-Down Converter with Superior Light-Load Efficiency. Available in Automotive (AEC-Q100) and Industrial Grade

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MP4559

MP4559

1.5A, 2MHz, 55V Step-Down Converter with Superior Light-Load Efficiency. Available in Automotive (AEC-Q100) and Industrial Grade

Datasheet

Description

The MP4559 is a high frequency step-down switching regulator with integrated internal high-side high voltage power MOSFET. It provides 1.5A output with current mode control for fast loop response and easy compensation.
The wide 3.8V to 55V input range accommodates a variety of step-down applications, including those in automotive input environment. A 12µA shutdown mode supply current allows use in battery-powered applications.
High power conversion efficiency over a wide load range is achieved by scaling down the switching frequency at light load condition to reduce the switching and gate driving losses.
The frequency foldback helps prevent inductor current runaway during startup and thermal shutdown provides reliable, fault tolerant operation.
By switching at 2MHz, the MP4559 is able to prevent EMI (Electromagnetic Interference) noise problems, such as those found in AM radio and ADSL applications.
The MP4559 is available in small 3mm x 3mm QFN10 and SOIC8 with exposed pad packages.

Features & Benefits

Wide 3.8V to 55V Operating Input Range
250mΩ Internal Power MOSFET
Up to 2MHz Programmable Switching Frequency
140μA Quiescent Current
Ceramic Capacitor Stable
Internal Soft-Start
Up to 95% Efficiency
Output Adjustable from 0.8V to 52V
Available in QFN (3mm x 3mm) and SOIC8E with Exposed Pad Packages

Active Part Numbers:

MP4559DN-LF-P MP4559DN-LF-Z MP4559DQ-LF-P MP4559DQ-LF-Z

Meaning of P & Z

Recommended Inductors

Semi-Shielded Inductor 2.2µH

Low-Profile Molded Inductor 2.2µH

Low-Profile Molded Inductor 2.2µH

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*Based on Nominal Values

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Standard Pricing

In stock

MP4559DQ-LF-Z MP4559DQ-LF-P

Package: QFN-10 (3x3)

5,000 per Reel

Buy Now Price $1.05 1K

Quantity Unit Price
1

$2.06
10

$1.75
100

$1.47
250

$1.39
500

$1.22
1K

$1.05

Special Pricing Available for
Larger Quantities Quote

In stock now: 8,500

Order now, up to 8,500 estimated to ship by 23 Jul, 2025

Lead Time For Additional Quantities

Additional quantities estimated to ship by 07 Nov, 2025

Arrives 3-4 business days. Shipping only $5 per order.

2500 Max per Company.
Limited Inventory to support product development.

MPS Pay: Pay by Invoice Net30 Terms Learn More

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MP4559DN-LF-Z MP4559DN-LF-P

Package: QFN-10 (3x3)

2,500 per Reel

Buy Now Price $0.99 1K

Quantity Unit Price
1

$1.93
10

$1.73
100

$1.45
250

$1.38
500

$1.08
1K

$0.99

Special Pricing Available for
Larger Quantities Quote

In stock now: 100

Order now, up to 100 estimated to ship by 23 Jul, 2025

Lead Time For Additional Quantities

Additional quantities estimated to ship by 07 Nov, 2025

Arrives 3-4 business days. Shipping only $5 per order.

100 Max per Company.
Limited Inventory to support product development.

MPS Pay: Pay by Invoice Net30 Terms Learn More

Create myMPS+ account for Free Samples

Technical Forum

Questions answered by MPS engineers in 24h

MP4559 maximum peak current

The MP4559 provides 1.5A output current. Datasheet Rev 1.01: The Ilim is 1.9A typ (duty cycle < 60%). There is...

DC-DC POWER CONVERTERS

Latest activity a year ago

Difference MP4559 and MP4560 on startup

Hi, I am successfully using an MP4559 and had to replace it with an MP4560 due to component availability. This also works as expected, bu...

DC-DC POWER CONVERTERS

Latest activity 2 years ago

MP4559, 3V3 out with additive 1Vpp ripple ~50kHz at higher load, compensation network issue

mp_q I have a newer design with MP4559 that has a ripple in addition to the 3V3 DC signal at the output when load is added. The more load,...

DC-DC POWER CONVERTERS

Latest activity 3 years ago

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All MPS parts are lead-free, halogen-free and adhere to the RoHS directive. See Environmental section for details.

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