LT1107IS8#TRPBF

Voltage - Output (Min/Fixed):	1.25V
Base Part Number:	LT1107
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-45°C ~ 85°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	63kHz
Current - Output:	1.5A (Switch)
Voltage - Output (Max):	50V (Switch)
Series:	--
Voltage - Input (Max):	30V
Voltage - Input (Min):	2V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck, Boost
Output Configuration:	Positive or Negative
Function:	Step-Up, Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LT1107IS8#TRPBF Application Field and Working Principle

Introduction

LT1107IS8#TRPBF is a monolithic DC to DC switching regulator IC developed by Linear technology. It consists of a current mode PWM (Pulse Width Modulation) controller, internal high efficiency power MOSFET, current sense amplifier and other protection circuitry to design a power supply with wide input voltage range and excellent output voltage regulation accuracy. The IC comes in the 8-pin MSOP and PowerPAD surface mount package with a wide operating temperature range from -40°C ~ 125°C, making it suitable for many different applications. Moreover, it is an industrial grade chip and has a maximum power dissipation of 500mW and operating temperature range of -40°C ~ 125°C, making it ideal for many applications requiring high reliability and temperature protection.Application FieldLT1107IS8#TRPBF is mainly used in the field of power management. It is suitable for many power applications, including:1. Battery powered devices: The LT1107IS8#TRPBF provides a highly efficient and cost-effective power solution for battery-powered devices such as laptops, mobile phones and medical instruments. 2. DC Motor control: The LT1107IS8#TRPBF can be used in motor control applications where a highly reliable and constant voltage is required. The smooth and stepless voltage adjustment ability of this IC makes it suitable for controlling the speed or position of DC or AC motors. 3. Automotive electronics: The LT1107IS8#TRPBF is suitable for applications such as voltage stabilization of automobile audio systems, which require higher reliability and temperature protection due to their operating temperature range of -40°C ~ 125°C.4. High reliability power supply: With its high efficiency and excellent temperature protection, the LT1107IS8#TRPBF can be used in high reliability power supply applications such as military and aerospace equipment.Working PrincipleThe LT1107IS8#TRPBF is a monolithic DC to DC switching regulator IC. The output voltage is regulated by controlling the ratio of On time vs. Off time of a power MOSFET. It consists of a Pulse Width Modulation (PWM) controller, high efficiency power MOSFET, current sense amplifier and other protection circuitry.The LT1107IS8#TRPBF operates by sensing the load current at the load side connection of its output power MOSFET. The load current is then compared with the values defined on its comparator bus. If the load current is high, then the PWM controller turns on its output MOSFET for a longer duration and thus increases the output voltage. Similarly, if the load current is low, then the PWM controller turns off its output MOSFET for a longer duration and thus decreases the output voltage. The output voltage is further regulated by controlling the switching frequency of its output MOSFET. The switch frequency can be adjusted using the “ON/OFF” switch. If the switch is in the “ON” position, then the PWM controller operates in the low frequency mode and if the switch is in the “OFF” position, then the PWM controller operates in the high frequency mode.The LT1107IS8#TRPBF also consists of an internal soft start circuitry, which provides a slow rise of the output voltage during start up. This helps in avoiding inrush current thereby increasing the life span of the device. Moreover, the LT1107IS8#TRPBF also features current limiting, short circuit protection and thermal shutdown protection, which protects the device from any unexpected events or accidents. ConclusionThe LT1107IS8#TRPBF is a versatile DC to DC switching regulator IC. It is an ideal choice for many different applications including battery powered devices, DC motor control and high reliability power supplies. It can easily regulate the output voltage by controlling the ratio of On time vs. Off time of its output power MOSFET. Moreover, it also provides additional protection features such as current limiting, short circuit protection and thermal shutdown protection. All these features make the LT1107IS8#TRPBF a perfect choice for applications requiring high reliability and temperature protection.

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