MC33166D2TG

Voltage - Output (Min/Fixed):	5.05V
Base Part Number:	MC33166
Supplier Device Package:	D2PAK-5
Package / Case:	TO-263-6, D²Pak (5 Leads + Tab), TO-263BA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	72kHz
Current - Output:	3.3A (Switch)
Voltage - Output (Max):	40V (Switch)
Series:	--
Voltage - Input (Max):	40V
Voltage - Input (Min):	7.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck, Boost
Output Configuration:	Positive or Negative
Function:	Step-Up, Step-Down
Part Status:	Active
Packaging:	Tube

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MC33166D2TG Application Field and Working Principle

MC33166D2TG is a DC/DC switching regulator, which is a type of DC/DC voltage converter used to regulate the output voltage. It is a member of the Power Management IC (PMIC) voltage regulators family.The MC33166D2TG is a high-frequency, 1.8 A synchronous DC/DC fixed-frequency step-down regulator. It is designed to effectively manage heavy loads on low drop-out voltage supplies. It has a Volt-per-Ohm (V/O) current limit for short-circuit protection and designed for automotive applications.

Features of MC33166D2TG

The MC33166D2TG has several features that make it suitable for various applications. These include:• High frequency (250KHz) operation to minimize external components and save board space.• Three built-in frequency modes (150, 250 and 420 kHz) allow flexibility.• Internal compensation allows easy operation and minimizes external components.• Auto-discharge current to reduce output inductor size.• 0.5V-6.5V input voltage range.• Output voltage adjustable from 0.6V to 5.5V.• 1.8A continuous output current.• Soft-start and current limit may be programmed by external resistors.• Over-temperature, over-current and short-circuit protection.• Internal P-Channel MOSFET for high efficiency.• Low stand by current of 10uA.

Applications of MC33166D2TG

The MC33166D2TG is suitable for many applications including telecommunication, automotive, industrial and consumer electronics. Some of the applications include:• Automotive data communications systems.• Automotive network communication systems.• Industrial control systems.• Motor control system.• Safety systems.• Power supplies for DSP applications.• Power supplies for FPGA applications.• Battery powered systems.

Working Principle of MC33166D2TG

The MC33166D2TG is a high-frequency, synchronous, step-down DC/DC voltage converter. It works by controlling the duty cycle of an internal switch. An internal comparator compares the voltage across an outer feedback resistor divider to an internal reference voltage. The comparator drives the switch accordingly. The on-time is increased when the output voltage is lower than the reference voltage and decreased when the output voltage is higher than the reference voltage.Assuming the startup sequence is not enabled, the PWM signal begins at a 50 percent duty cycle. During this time, part of the energy stored in the output inductor is discharged into the output capacitor. The voltage on the output capacitor starts to increase until it reaches the regulation voltage, as determined by a resistive divider on the output.When the output voltage is equal to the reference voltage, the duty cycle begins to decrease. If the duty cycle is reduced to zero, the output voltage again begins to decrease. A high-precision adaptive output voltage can be maintained in this way.The MC33166D2TG also contains integrated short-circuit protection and over-temperature protection. Protection is based on a current-limit detection circuit, which limits the peak inductor current to a certain level, as set by an external resistor.

Conclusion

The MC33166D2TG DC/DC switching regulator is an efficient, cost-effective and reliable voltage converter for various industrial, automotive, consumer electronics and telecommunication applications. It uses fixed frequency, 1.8A synchronous DC/DC step-down mechanism and offers various protection features such as over-temperature and short-circuit protection. The device supports high efficiency as it uses an internal P-Channel MOSFET. It also has 3 built-in frequency modes that can be programmed using external resistors. The device is suitable for many applications due to its low stand by current and wide input voltage range.

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