MIC3223YTSE

Voltage - Supply (Max):	20V
Base Part Number:	MIC3223
Supplier Device Package:	16-TSSOP-EP
Package / Case:	16-TSSOP (0.173", 4.40mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Applications:	Lighting, Signage
Dimming:	PWM
Frequency:	1MHz
Current - Output / Channel:	3.5A (Switch)
Voltage - Output:	37V
Series:	--
Voltage - Supply (Min):	4.5V
Number of Outputs:	1
Internal Switch(s):	Yes
Topology:	Step-Up (Boost)
Type:	DC DC Regulator
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tube

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PMIC - LED Drivers: MIC3223YTSE Application Field and Working Principle

The MIC3223YTSE is a low-power, low-footprint, high-efficiency LED driver from Microchip Technology that combines a signal conditioning, switch-mode power converter, and MOSFET driver into an integrated circuit. With a comprehensive suite of features, this LED driver is designed to provide an energy-efficient and robust platform for driving a variety of devices. This application note describes the features, applications, and working principle of the MIC3223YTSE LED driver.The MIC3223YTSE is an low-power, low-footprint, high-efficiency LED driver from Microchip Technology. It is capable of driving up to 7 LEDs with a nominal forward voltage of 8–30 V DC and a maximum forward current of 25 A. The MIC3223YTSE uses a low-capacitance, low-voltage power MOSFET switch to regulate the current to the LEDs. Its AEC-Q100 certification makes it a suitable choice for automotive applications, including electronics and monitor designs.At the heart of the MIC3223YTSE is a high-frequency current-mode switching regulator, which is capable of delivering up to 200mA of output current. The chip also features linear dimming control, active transconductance modulation, and open-circuit protection. Its high-speed pulse-width modulation (PWM) control allows for smooth dimming and controlled current switching that can be tailored to any application. Additionally, the integrated power MOSFET provides high efficiency and low noise on the output.The MIC3223YTSE LED driver is designed to be used in a variety of automotive, monitor and electronics applications, including LED decorative lighting, LED indicators, LED backlighting, LED signage, and more. It is ideal for use in applications where low power consumption and improved heat dissipation is of the utmost importance, such as automotive headlamps and fog lamps, where the LED power dissipation can be as high as 2.5 W and as low as 0.1 W. The chip is also well-suited for portable electronic devices and vehicle clusters that require dimming and higher levels of efficiency in order to optimize power and battery life.The MIC3223YTSE LED driver can be controlled by either an external PWM signal or an analog input. The chip features a linear dimming control, enabling it to controllably switch the LEDs from a fully-on to a fully-off state in milliseconds. Additionally, the active transconductance modulation allows for higher efficiency and low frequency noise. When used with an external PWM signal, the chip is capable of driving 7 LEDs with a duty cycle of up to 100%.The working principle of the MIC3223YTSE LED driver involves several steps. Initially, the current is controlled by an internal current-sensing MOSFET switch. The closed-loop feedback (CLF) circuitry is designed to regulate the current, keeping it within a specified range. The CLF integrates the decay capacitor voltage and the power MOSFET switch drain voltage to generate a reference current.After the CLF generates the reference current, it is compared to the voltage from the current-sense resistor. The output of the comparator is then fed to the MOSFET current-sense time lag as an input. This adjusts the MOSFET switch on-time to maintain the current as close to the reference current as possible. Finally, the MOSFET switch will switch off each LED depending on the dimming control. The chip also provides open-circuit protection, as well as ESD, EOS/UL, and voltage spike protection. With this, it ensures that the LED is not damaged due to any external disturbances or sudden power fail or slow decay due to decay capacitor voltage during dimming.In conclusion, the MIC3223YTSE LED driver is an ideal choice for automotive, monitor and electronics applications. It features a high-frequency current-mode switching regulator, active transconductance modulation, and open-circuit protection, offering power savings and improved dimming control. The chip also provides ESD, EOS/UL, and voltage spike protection, making it a safe, reliable, and well-rounded choice for any LED drive application.

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