The LM2596 switching voltage regulator is a step-down power management monolithic integrated circuit that can output a 3A drive current with excellent linear and load regulation characteristics. The fixed output version is 3.3V, 5V, and 12V, and the adjustable version can output various voltages less than 37V. The device integrates frequency compensation and a fixed frequency generator internally, and the switching frequency is 150KHz. Compared with low-frequency switching regulators, smaller filter components can be used. Since the device only requires 4 external components, a common standard inductor can be used, which further optimizes the use of the LM2596 and greatly simplifies the design of the switching power supply circuit. Its packaging forms include standard 5-pin TO-220 package (DIP) and 5-pin TO-263 surface mount package (SMD). The device also has some other features: Under the conditions of specific input voltage and output load, the output voltage error can be guaranteed to be within the range of ±4%, and the oscillation frequency error is within the range of ±15%; external power-off can be achieved with a standby current of only 80μA; it has a self-protection circuit (a two-level frequency reduction and current limiting protection and an over-temperature complete protection circuit that cuts off power under abnormal conditions) ※ Fixed voltage output and adjustable voltage output of 3.3V, 5V, and 12V ※ Adjustable output voltage range 1.2V~37V±4% ※ Good output linearity and load adjustable ※ Output current can be as high as 3A ※ Input voltage can be as high as 40V ※ Using an internal oscillation frequency of 150KHz, it belongs to the second generation of switching voltage regulators with low power consumption and high efficiency ※ In low-power standby mode, the typical value of IQ is 80μA ※ TTL power-off capability ※ With overheat protection and current limiting protection functions ※ Package form: TO-220 (T) and TO-263 (S) ※ The peripheral circuit is simple, requiring only 4 external components and using readily available standard inductors
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