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LTM8050 датащи(PDF) 11 Page - Linear Technology |
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LTM8050 датащи(HTML) 11 Page - Linear Technology |
11 / 24 page LTM8050 11 8050fc For more information www.linear.com/LTM8050 BLOCK DIAGRAM OPERATION The LTM8050 is a standalone nonisolated step-down switching DC/DC power supply that can deliver up to 2A of outputcurrent.Thismoduleprovidesapreciselyregulated output voltage programmable via one external resistor from 0.8V to 24V. The input voltage range is 3.6V to 58V. Given that the LTM8050 is a step-down converter, make sure that the input voltage is high enough to support the desired output voltage and load current. As shown in the Block Diagram, the LTM8050 contains a current mode controller, power switching element, power inductor, power Schottky diode and a modest amount of input and output capacitance. The LTM8050 is a fixed frequency PWM regulator. The switching frequency is set by simply connecting the appropriate resistor value from the RT pin to GND. Aninternalregulatorprovidespowertothecontrolcircuitry. The bias regulator normally draws power from the VIN pin, but if the BIAS pin is connected to an external volt- age higher than 2.8V, bias power will be drawn from the external source (typically the regulated output voltage). This improves efficiency. The RUN/SS pin is used to place the LTM8050 in shutdown, disconnecting the output and reducing the input current to less than 1μA. To further optimize efficiency, the LTM8050 automatically switches to Burst Mode® operation in light load situations. Between bursts, all circuitry associated with controlling the output switch is shut down reducing the input supply current to 50μA in a typical application. TheoscillatorreducestheLTM8050’soperatingfrequency when the voltage at the FB pin is low. This frequency fold- back helps to control the output current during start-up and overload. The LTM8050 contains a power good comparator which trips when the FB pin is at roughly 90% of its regulated value. The PGOOD output is an open-collector transistor that is off when the output is in regulation, allowing an externalresistortopullthePGOODpinhigh.Powergoodis valid when the LTM8050 is enabled and VIN is above 3.6V. The LTM8050 is equipped with a thermal shutdown that will inhibit power switching at high junction tempera- tures. The activation threshold of this function, however, is above 125°C to avoid interfering with normal operation. Thus, prolonged or repetitive operation under a condition in which the thermal shutdown activates may damage or impair the reliability of the device. 8050 BD VIN 8.2µH 4.4µF 0.2µF CURRENT MODE CONTROLLER RUN/SS SHARE SYNC AUX BIAS GND RT FB PGOOD VOUT 15pF 499k 1% |
Аналогичный номер детали - LTM8050 |
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Аналогичное описание - LTM8050 |
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