MP8666DN-LF

Voltage - Supply (Vcc/Vdd):	4.5 V ~ 21 V
Supplier Device Package:	8-SOIC-EP
Package / Case:	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	No
Duty Cycle (Max):	90%
Frequency - Switching:	600kHz
Series:	--
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Not For New Designs
Packaging:	Tube

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Introduction

PMIC, or power management IC, is an integrated circuit that supplies power to the components and circuitry of a system. DC DC switching controllers are a category of PMICs that helps to convert voltages from one level to another. The MP8666DN-LF is a switching controller IC designed by Monolithic Power Systems to provide voltage conversion in a small and compact form factor.

Data Sheet Overview

The MP8666DN-LF is a monolithic high frequency DC DC step-down LED driver IC for automotive or industrial applications with a wide 4.5-36V input voltage range. It has a very low input bias current which makes it suitable for high voltage applications. It is built with a Smart Dimming control circuit which provides various dimming control options such as DC dimming, analog dimming, or pulse width modulation. The MP8666DN-LF includes protection functions like current limit protection, thermal shut down, over voltage protection, and soft start. The MP8666DN-LF has a high step-down conversion efficiency of up to 97% with a maximum output current of up to 2A. Its switching frequency is programmable from 200KHz to 4MHz, making it an ideal device for applications that require a high switching frequency. Additionally, its programmable delay on/off switch ensures a stable and reliable start and stop of the system.

Application Fields

The MP8666DN-LF is an ideal device for applications that require high efficiency, small size, and high voltage input range. It is suitable for automotive and industrial applications, as well as a wide range of lighting applications such as LED lamps, backlighting, automotive headlamps, motorcycle headlamps, horticultural lighting systems, and more.

Working Principle

The MP8666DN-LF works on the principle of DC-DC boost converter. The integrated switching control circuit regulates the voltage and current flowing through the primary side of the switch. The primary side, also known as the high side, is connected to the input voltage and consists of two switches - an N-channel MOSFET for the high side switch and a P-channel MOSFET for the low side switch. Buck converters are designed to provide a step-down voltage conversion process in which a higher input voltage is converted to a lower output voltage. The ratio between the input and output voltage is determined by the duty cycle of the on/off switch. As the switches are switched on/off in turns, the output voltage can be adjusted by varying the duty cycle. When the control circuit is on, the high side switch is connected to the input voltage and the low side switch is connected to the output voltage. The control circuit uses the high and low side switches to create a pulsating voltage drop across the inductor (L1). During the ON period, the energy is stored in the inductor (L1). As the control circuit turns off the switches, the stored energy is released from the inductor and transferred to the output capacitors (C2, C2). This process is then repeated and a constant output voltage is obtained.

Conclusion

The MP8666DN-LF is an integrated DC-DC boost converter designed to provide a high efficiency, small size, and high voltage input range. It is suitable for a wide range of automotive and industrial applications, as well as a variety of lighting applications. Its step-down conversion efficiency of up to 97%, programmable switching frequency, and programmable on-off delay switch make it an ideal device for applications that require a high switching frequency.

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