LT1171HVCQ#PBF

Voltage - Output (Min/Fixed):	1.244V
Base Part Number:	LT1171
Supplier Device Package:	5-DDPAK
Package / Case:	TO-263-6, D²Pak (5 Leads + Tab), TO-263BA
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 100°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	100kHz
Current - Output:	2.5A (Switch)
Voltage - Output (Max):	75V (Switch)
Series:	--
Voltage - Input (Max):	60V
Voltage - Input (Min):	3V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck, Boost, Cuk, Flyback, Forward Converter
Output Configuration:	Positive or Negative
Function:	Step-Up, Step-Down, Step-Up/Step-Down
Part Status:	Active
Packaging:	Tube

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LT1171HVCQ#PBF Application Field And Working Principle

PMIC (Power Management ICs) are used in a wide variety of applications, from consumer electronics to industrial systems. They help to regulate the power consumption of electric and electronic circuits. Voltage regulators are semiconductor devices that provide a consistent output voltage that is independent of the input voltage variation. DC-DC switching regulators are used to achieve an output voltage that is different from the input voltage. They are more efficient than linear regulators and they can change the output voltage much faster. The LT1171HVCQ#PBF is a high voltage DC-DC switching regulator from Linear Technology (LT). It is capable of delivering up to 2A of output current and is suitable for applications requiring high-speed dynamic regulation.

Description

The LT1171HVCQ#PBF is a synchronous step-down DC-DC switching regulator with a 3.1V to 30V input voltage range. It uses a single N-Channel power MOSFET to provide 2A of continuous output current. The device features a wide range of features including 4000-V increased security isolation (IS0), power-good signal, over-current protection and soft-start. It is also capable of operating up to 95% efficiency.

Applications

The LT1171HVCQ#PBF is ideal for applications requiring a wide input voltage range, high efficiency, and fast dynamic regulation. These include industrial and servers, automotive systems, battery powered applications, telecommunications, and consumer electronics.

Features

The LT1171HVCQ#PBF features an extended input voltage range from 3.1V to 30V. It has a wide operating temperature range of -40°C to +125°C. It is capable of operating with switching frequency up to 3MHz and the output voltage can be adjusted in the range of 0.8V to 27V. The device also features a 4000-V increased security isolation (IS0), power-good signal, over-current protection and soft-start functionality.

Functionality

The LT1171HVCQ#PBF employs a synchronous, buck-type switching regulator in order to achieve a regulated output voltage. As its name suggests, it uses a transformer in order to match the output voltage to the input voltage. The primary windings are energized with a pulse width modulated (PWM) signal, generated by the chip. This signal is controlled by a second winding on the transformer, which is regulated by the feedback from the output voltage. The PWM signal is generated by comparing the voltage of an external reference (Vref) with the feedback signal from the output. When the Vref level is higher than the output voltage, the pulse width of the output drive is increased, causing the output voltage to increase. On the other hand, when the Vref level is lower than the output, the pulse width of the output drive is decreased, reducing the output voltage. The LT1171HVCQ#PBF also features a power good signal output. This output is active high and goes low when the output voltage is outside the preset regulation limits (under-voltage or over-voltage). This signal can be used to provide external logic with an alert of abnormal conditions. As well as power good, the device also features a thermal shutdown, current limiting, and short-circuit protection.

Conclusion

The LT1171HVCQ#PBF is a high voltage DC-DC switching regulator from Linear Technology. It offers a wide input voltage range, high efficiency and fast dynamic regulation, making it suitable for a wide range of applications. Its unique features, such as a 4000-V increased security isolation (IS0), power-good signal, over-current protection and soft-start functionality make it an ideal choice for those situations where high-speed dynamic regulation is a requirement.

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