MIC3201YME

Voltage - Output:	--
Base Part Number:	MIC3201
Supplier Device Package:	8-SOIC-EP
Package / Case:	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Applications:	Lighting
Dimming:	PWM
Frequency:	1MHz
Current - Output / Channel:	1A (Switch)
Series:	--
Voltage - Supply (Max):	20V
Voltage - Supply (Min):	6V
Number of Outputs:	1
Internal Switch(s):	Yes
Topology:	Step-Down (Buck)
Type:	DC DC Regulator
Part Status:	Active
Packaging:	Tube

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Introduction to MIC3201YME—PMIC-LED Drivers

PMIC-LED drivers are a type of power management integrated circuits (PMICs) designed to drive and control the current flow to light-emitting diodes (LEDs). As LEDs become more widely used for Luminary applications and grow in complexity, MIC3201YME, an LED driver PMIC from Rohm Semiconductor, has become increasingly popular for its ability to ensure the control and power efficiency of LED lighting products requiring multiple types of LED drivers. This article will discuss this device’s application field and its working principle.

Application Field

Backlighting systems used in displays, TVs, mobile phones, and computers typically use numerous LEDs that require driving with different currents and voltages. For example, the typical visible light spectrum has multiple colors, so this means that the LEDs used in those systems need different current or voltage drives for each color of LED. This is where the MIC3201YME becomes useful; it serves as an integrated LED driver PMIC capable of controlling up to eight independent LED channels with +/-10% accuracy and up to 0.6A of LED current per channel.In addition, the MIC3201YME is also ideal for LED lighting products that require a dimming feature such as street lights and street lamps. The MIC3201YME offers a wide dimming range from 1% to 100%, allowing for high precision dimming control.

Working Principle

At its core, the MIC3201YME is a buck-type or switching regulator that is configured to output the required current to its load. It works by taking in an input voltage and then regulating its output to the required current or voltage. This is achieved through PWM control, whereby the time that the current is enabled is assumed to be a percentage of the total time, which then translates to an output current or voltage proportional to the percentage of time during which the current is enabled. As a result the axis at this device is controlled by the magnitude of an external current-sense resistor, which defines the total load current. The remaining parameters such as voltage, current, and temperature are monitored internally. This data is then used to control the internal FET switch, allowing the device to regulate the output voltage of the external LEDs. The MIC3201YME also offers a soft start feature to prevent inrush currents and damages resulting from sudden large currents flowing through the LED. It offers a wide buck conversion range from 8V to 40V, and is also equipped with various protection features to ensure safe operation including a UVLO protection, over-voltage protection, a thermal shutdown function, and current limit protection.In summary, the MIC3201YME from Rohm Semiconductor is an LED driver PMIC with features suitable for a wide range of LED lighting applications. It serves as an efficient and highly-integrated LED control solution, capable of controlling up to 8 LED channels with +/-10% accuracy and up to 0.6A LED current per channel. It has voltage, current, and temperature monitoring features, and provides features such as start and protection features to ensure safe operation.

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