LM2576BT

Voltage - Output (Min/Fixed):	1.23V
Base Part Number:	LM2576
Supplier Device Package:	TO-220-5
Package / Case:	TO-220-5
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	52kHz
Current - Output:	3A
Voltage - Output (Max):	37V
Series:	--
Voltage - Input (Max):	40V
Voltage - Input (Min):	4V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Obsolete
Packaging:	Tube

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LM2576BT application field and working principle The LM2576BT is a series of monolithic integrated high-efficiency switched mode buck regulators with an output voltage adjustable from 0.8 to 5.0 V. It is capable of driving loads with currents up to 1.5 A and provides a high degree of protection against short-circuits and line transients. The LM2576BT is designed to meet the needs of a wide range of mobile and wireless applications including mobile phones, PDAs, and other battery-powered systems.The LM2576BT is designed to provide an adjustable output voltage from 0.8 to 5.0 V, with a maximum output current of 1.5 A, and a minimum input voltage of 4 V. It has high-efficiency operation at a very low cost, and is optimized for low quiescent current consumption. The input voltage range is from 3 V to 14 V, making it compatible with a wide range of power supply designs.The LM2576BT features a high frequency, pulse-width-modulated (PWM) controller which operates at frequencies up to 300 kHz, allowing for easy integration into a variety of applications. The internal synchronous rectifier system minimizes the current flow through the external switch, thus enabling efficient operation with a minimum number of external components.The LM2576BT works by using its high frequency PWM controller to sense the output of the power supply and compare it with the reference voltage. A pulse-width-modulated signal with a duty cycle proportional to the regulated output voltage is then sent to the external switches controlling the output.By continuously modulating the output of the device, the LM2576BT can maintain an output voltage level that is relatively independent of changes in the input voltage, load current, or temperature. The output voltage will be within a few percent of the programmed value in most cases. The operating temperature range of the LM2576BT is from – 40 to 125 °C.The LM2576BT also has numerous protection features to ensure reliable operation. The device can detect an output over-voltage condition and will self-protect by disabling its output as soon as any abnormal condition is detected. The output remains disabled until the fault is cleared. The LM2576BT also features both thermal and overload protection.With its high efficiency, wide input voltage range, low quiescent current, and low cost, the LM2576BT is an ideal choice for controlling power in a variety of applications. Its small size and wide operating temperature range make it ideal for mobile and wireless applications, where size and power efficiency are key considerations.

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