LT1109CS8-12#TRPBF

Voltage - Output (Min/Fixed):	12V
Base Part Number:	LT1109
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	120kHz
Current - Output:	1.2A (Switch)
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	20V
Voltage - Input (Min):	5V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

LT1109CS8-12#TRPBF is a voltage regulator integrated circuit manufactured by Linear Technology Corporation. It is designed to work as a controllable DC-DC switching regulator. Its feature set rests on its adjustable output current, wide input voltage range, high efficiency, low quiescent current, pulse frequency modulation, and constant on time control. High frequency operation is enabled by a 10nA low enable current, thus eliminating the need for external frequency selection components.

Application Field

These features make the LT1109CS8-12#TRPBF suitable for a range of applications. It is widely used as a regulating controller in a variety of DC-DC supply circuits in data networks, telecommunications, automotive, and wireless power applications. It is also suitable for custom power supply designs, where the output voltage may have to be adjusted over time to increase efficiency. Other applications include powering of analog and digital loads such as FPGAs, CPLDs, ASICs, DGAs, and other circuit elements that require constant voltage.

Working Principle

The LT1109CS8-12#TRPBF features an internal synchronous step-down regulator and adjustable voltage loop. Its output voltage is adjustable by an external resistor divider, which adjusts the regulated voltage. The regulator is controlled using a wide switching frequency range of 300 kHz~1 MHz. This allows for operation at higher frequencies, increasing efficiency and therefore eliminating the need for external frequency selection components. The internal synchronous regulator also allows for higher efficiency and smaller footprints. The pulse frequency modulation (PFM) of the LT1109 enables it to reduce the quiescent current and power loss at the same time. The PFM also provides the good line and load transient response. The on time control ensures that the switch-on duration is constant when the input voltage is within a certain range. This reduces the power loss and also stabilizes the output voltage.The LT1109 also offers overload and over-temperature protection. The overload protection is provided by detecting the output current; if the output current exceeds the set limit , the supply is shut down. The over-temperature protection is provided by sensing the temperature of the LT1109 using a thermistor; when the temperature exceeds a certain limit, the voltage regulator shuts down.

Conclusion

The LT1109CS8-12#TRPBF is one of the most efficient and reliable DC-DC switching regulators available on the market. Its wide input voltage range and adjustable output current make it suitable for use in a range of applications. It features pulse frequency modulation, low quiescent current, and on-time control for enhanced efficiency and power management, and also offers overload and thermal protection. All these features make the LT1109CS8-12#TRPBF an ideal choice for power supply design.

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