LT3991IMSE-5#PBF

Voltage - Output (Min/Fixed):	5V
Base Part Number:	LT3991
Supplier Device Package:	10-MSOP-EP
Package / Case:	10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	200kHz ~ 2MHz
Current - Output:	1.2A
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	55V
Voltage - Input (Min):	4.3V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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LT3991IMSE-5#PBF: Application Field and Working Principle

The LT3991IMSE-5#PBF regulator is part of the PMIC (Power Management Integrated Circuit) family of devices, specifically Voltage Regulators/DC DC Switching Regulators. It can be used to convert a wide input voltage range from 3V to 60V to various lower DC voltages for various loads. The LT3991IMSE-5#PBF boasts an impressive efficiency of up to 95% over the entire input voltage range.

LT3991IMSE-5#PBF Application Field

The LT3991IMSE-5#PBF regulator can be used in a variety of applications such as: mobile handsets, battery powered portable devices, battery management systems, telecom infrastructure and automotive applications. In mobile handsets, it can be used to convert the input voltage of a battery to the required level of VDDIO, VDD, and VDDa in order to drive the power subsystem of the handset. In battery management systems, it can be used to convert the high voltage coming from batteries to the lower voltage required for the system. It can also be used for powering telecom infrastructure systems, which need a steady supply of low voltage to keep communications running.

LT3991IMSE-5#PBF Working Principle

The LT3991IMSE-5#PBF regulator uses pulse width modulation, or PWM, to convert the input voltage to a specific output voltage. It works by pulsing the input voltage at a constant frequency. The duty cycle of the pulse is then varied according to the required output voltage. In steady state, a certain average voltage is applied to the output. The LT3991IMSE-5#PBF regulator possesses several features that make it suitable for the applications discussed above. It has a fast transient response, a wide input voltage range, low operating current, and a wide temperature operating range. It also has two selectable soft start functions - either a resistor selectable or an external capacitor selectable startup - as well as programmable overcurrent protection and current limit. The LT3991IMSE-5#PBF regulator also has an adjustable setpoint option and constant-voltage/constant-current (CC/CV) capability, which makes it easier to control the output voltage or current. It also features a synchronizable frequency for those applications where noise may be an issue.

Conclusion:

LT3991IMSE-5#PBF is a highly efficient, versatile and feature-rich voltage regulator/switching regulator designed to convert a wide input voltage range from 3V to 60V to various low DC voltages. It is well suited for a variety of applications such as mobile handsets, battery powered portable devices, battery management systems, telecom infrastructure and automotive applications. The LT3991IMSE-5#PBF offers high efficiency over the entire input voltage range, and features a wide range of adjustable options such as fast transient response, a wide input voltage range, low operating current, and a wide temperature operating range. It also has two selectable soft start functions, programmable overcurrent protection, current limit, and synchronizable frequency.

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