LT1578IS8#PBF

Voltage - Output (Min/Fixed):	1.21V
Base Part Number:	LT1578
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	200kHz
Current - Output:	1.5A
Voltage - Output (Max):	14.1V
Series:	--
Voltage - Input (Max):	15V
Voltage - Input (Min):	4V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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LT1578IS8#PBF Application Field and Working Principle

The LT1578IS8#PBF is a high performance, low-noise dc-dc switching regulator designed to provide up to 4A of output current. This type of voltage regulator device uses pulse width modulation (PWM) to regulate output voltage. The device offers two fixed internal frequency settings to allow precise control of switching frequencies, and a wide selection of operating frequencies.

Application Field

The LT1578IS8#PBF is suitable for many different applications where a precise and stable output voltage is required. Its small size means it can be used in a variety of space-limited applications. Such applications include point-of-load regulation, converter cascades, voltage translator and post-regulator power supplies. Additionally, it can also be used in automotive, avionics and telecom applications where high reliability and performance is required.

Working Principle

The device works by taking an input voltage and smoothly converting it to a precise and stable output voltage. The device uses a control circuit to compare the output voltage feedback to a reference voltage level and adjust the duty cycle of the switching transistor accordingly. The voltage regulator is constantly adjusting the duty cycle to maintain the set output voltage level. When the load current increases the duty cycle also increases, which ensures that the output voltage does not droop.The switching transistor has two parts: a high side MOSFET, which takes the input voltage and switches it to the output voltage, and a low side MOSFET which acts as a current sink and dissipates excess energy. The device also has specific protection features such as current-limit protection and thermal shutdown. This protects the device from shorts and at high operating temperatures.The LT1578IS8#PBF is capable of a wide range of operation frequencies and voltages, so it can be used in a variety of different applications. It also has a low-noise operation, which makes it ideal for audio applications.

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