LT1109ACN8-12#PBF

Voltage - Output (Min/Fixed):	12V
Base Part Number:	LT1109
Supplier Device Package:	8-PDIP
Package / Case:	8-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Operating Temperature:	0°C ~ 70°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	120kHz
Current - Output:	2A (Switch)
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	9V
Voltage - Input (Min):	2V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Part Status:	Active
Packaging:	Tube

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

Introduction to LT1109ACN8-12#PBF

LT1109ACN8-12#PBF is a fixed-frequency current-mode DC-DC switching regulator with integrated MOSFETs developed by Linear Technology Corporation. It is a high frequency synchronous buck converter with independent input voltage range of 0.8V - 5.5V and output voltage range of 0.8V - 12V, allowing for high current operation up to 20A. The device has internal switching frequency of 500kHz - 1.2MHz allowing for excellent transient response, making it ideal for EMI sensitive applications.

Application Field of LT1109ACN8-12#PBF

LT1109ACN8-12#PBF is widely used in cellular phones, DVD players, battery chargers, LAN cards, printers, computer game consoles and other portable devices. It is well suited for applications requiring high efficiency and power density due to its high switching frequency, high integration, and tight regulation.

Working Principle of LT1109ACN8-12#PBF

The LT1109ACN8-12#PBF is a synchronous buck converter with a single inductor. It converts an input voltage of 0.8V~5.5V to an output voltage of 0.8V~12V. There is an internal high-side and low-side MOSFET for power switch. The output voltage is adjustable via an external resistor divider. The switching frequency is internally regulated from 500kHz to 1.2GHz, and the output voltage is regulated by current mode control.The LT1109ACN8-12#PBF features a high-side MOSFET. It also features a low-side Schottky diode connected to the source of the high-side MOSFET. The high-side MOSFET is turned on when the peak inductor current reaches predetermined threshold. When the high side MOSFET is on, the diode is reverse biased and the current flow through the inductor creates a negative voltage on the low side of the inductor. When the peak current is exceeded, the high-side MOSFET is turned off, and the current passing through the diode creates a positive voltage on the low side of the inductor. This is the basic principle of operation.The device also has a low-side MOSFET to regulate the output voltage. The low-side MOSFET controls the output voltage by changing the duty cycle of the high-side MOSFET. This is done by sensing the peak inductor current and reducing the duty cycle appropriately.

Protection Features of LT1109ACN8-12#PBF

The LT1109ACN8-12#PBF also has several protection features designed to protect the device and its connected circuits. It features current limit, over temperature protection, and external shutdown. The current limit is programmable and can be set anywhere between 1/2 and 3 times the nominal output current. The over temperature protection will shut down the device if the temperature exceeds 165C and will reset when the temperature is below 145C. The external shutdown feature allows the device to be shut down externally, if desired.

Conclusion

The LT1109ACN8-12#PFB is a high frequency synchronous buck converter from Linear Technology Corporation, suitable for a wide variety of applications ranging from cellular phones and DVD players to battery chargers, LAN cards, printers, and computer game consoles. The working principle is based on a single inductor current mode DC-DC converter, with integrated high-side and low-side MOSFETs and an adjustable switching frequency. It features several protection features, such as current limit, over temperature protection, and external shutdown, making it an ideal device for many power solutions.

The specific data is subject to PDF, and the above content is for reference

Part Number	Manufacturer	Price	Quantity	Description