LM2575-5.0BWM

Voltage - Output (Min/Fixed):	5V
Base Part Number:	LM2575-5.0
Supplier Device Package:	24-SOIC
Package / Case:	24-SOIC (0.295", 7.50mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	52kHz
Current - Output:	1A
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	40V
Voltage - Input (Min):	4V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Discontinued at Digi-Key
Packaging:	Tube

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Introduction

PMIC (Power Management Integrated Circuit) Voltage Regulators are widely used in electronic systems to maintain a fixed output voltage with a specified current load. One such voltage regulator is the DC-DC switching regulator, which can provide a wide range of output voltages from a single regulated input voltage. The LM2575-5.0BWM is a high efficiency, 5.0V output voltage, DC-DC switching regulator designed specifically for power supply applications.

Application Field

The LM2575-5.0BWM is designed to be used in a wide variety of electronic applications, such as battery chargers, microprocessor systems, cellular phones, and Ethernet network power supplies. Its small size and low power dissipation make it an ideal choice for portable applications. The LM2575-5.0BWM is also a highly efficient regulator, offering high load current up to 500mA and an operating efficiency of up to 96%.

Working Principle

The LM2575-5.0BWM operates by using a fixed frequency pulse-width modulation (PWM) control mechanism. The device operates with a fixed 50 kHz switching frequency. The output voltage is controlled by adjusting the pulse-width of the PWM signal.The PWM circuit is activated by an internal oscillator that provides the necessary clock. The oscillator\'s frequency is determined by an external capacitor and an internal resistor, and the circuit will provide a square wave signal at the output with a duty cycle controlled by a voltage divider network. A comparator monitors the actual output voltage. If the output voltage is above the required voltage, the PWM signal will be lengthened, reducing the output voltage. Conversely, if the output voltage is below the required voltage, the PWM signal will be shortened, thus increasing the output voltage.The LM2575-5.0BWM also employs a programmable output voltage mode. This permits a user to program a specific output voltage with a resistor divider network and select the regulator’s output to be 1/2 of the input voltage, 1/3 of the input voltage, or predetermined voltage set by a voltage divider network.

Conclusion

The LM2575-5.0BWM is a high efficiency, 5.0V output voltage, DC-DC switching regulator designed specifically for power supply applications. With its small size, low power dissipation and high load current, it is the ideal regulator for a variety of portable applications. Its PWM control mechanism and programmable output voltage mode provide maximum flexibility and user control.

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