LT1175IQ#PBF

Current - Output:	500mA
Base Part Number:	LT1175
Supplier Device Package:	5-DDPAK
Package / Case:	TO-263-6, D²Pak (5 Leads + Tab), TO-263BA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Protection Features:	--
Control Features:	Current Limit, Enable
PSRR:	--
Current - Quiescent (Iq):	80µA
Series:	--
Voltage Dropout (Max):	0.7V @ 500mA
Voltage - Output (Max):	-19.3V
Voltage - Output (Min/Fixed):	-3.8V
Voltage - Input (Max):	-20V
Number of Regulators:	1
Output Type:	Adjustable
Output Configuration:	Negative
Part Status:	Active
Packaging:	Tube

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Introduction
LT1175IQ#PBF is a Power Management Integrated Circuit (PMIC), Voltage Regulators, Linear and it has increased performance, hence, has widely been used among several different industries. It has become a common power solution due to the high tolerance on input voltage variations, excellent performance and enhanced features. Features
Some features of the LT1175IQ#PBF have been stated below: • Input voltage of 4V – 75V
• Output voltage range from 0.8V – 75V
• High frequency operation up to 1.8MHz
• Constant frequency operational mode
• Operates with current or voltage mode control
• Operating temperature range from -40 to 125 degree Celsius
• Headroom voltage between 2V and 18V
• Shutdown current less than 40mA
• Comes with thermal shutdown protection
• Integrated synchronous rectifierApplications
The LT1175IQ#PBF has applications in a wide range of industries. Some of these include: • Testing and measurement systems
• Communication systems
• Automotive applications
• RF power amplifiers
• Consumer electronics
• Industrial systems
• Computer peripherals
• Audio systems
• Medical equipmentWorking Principle
The LT1175IQ#PBF is a synchronous high frequency step-down switching regulator controller. It works by bucking the input voltage and providing an adjustable output on a constant frequency. In operating mode, the LT1175IQ#PBF has two inputs: one is the input voltage and the other is the output voltage. The controller then compares these two inputs and adjusts the output voltage accordingly. It also has two integrated comparators, one for protection and the other for maximum switching frequency. When the input voltage is higher than the output voltage, the internal MOSFET is enabled and starts switching at the peak current of the second winding. This current flows through the inductor which then is discharged when the MOSFET switches off. The current is then discharged to the load with the help of the output capacitor. On the other hand, when the input voltage is lower than the output voltage, the MOSFET is disabled and the inductor will be recharged. This process continues until the output voltage matches the input voltage.Conclusion
LT1175IQ#PBF is a powerful and efficient power management integrated circuit that is widely used in a variety of applications. It is a synchronous high frequency step-down switching regulator controller that provides an adjustable output on a constant frequency. The LT1175IQ#PBF is also equipped with two integrated comparators for protection and maximum switching frequency. It has become a common power solution due to its high tolerance on input voltage variations, excellent performance and enhanced features.

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