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LTM8033IV-PBF Datasheet(PDF) 10 Page - Linear Technology |
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LTM8033IV-PBF Datasheet(HTML) 10 Page - Linear Technology |
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10 / 24 page  LTM8033 10 8033f OPERATION The LTM8033 is a standalone nonisolated step-down switching DC/DC power supply that can deliver up to 3A of output current. It is an EMC product; its radiated emissions are so quiet that it can pass the stringent requirements of EN55022 class B as a stand alone product. This μModule provides a precisely regulated output voltage program- mable via one external resistor from 0.8V to 25V. The input voltage range is 3.6V to 36V. Given that the LTM8033 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 LTM8033 contains an EMI filter, current mode controller, power switching ele- ment, power inductor, power Schottky diode and a modest amount of input and output capacitance. The LTM8033 is a fixed frequency PWM regulator. The switching frequency is set by simply connecting the appropriate resistor value from the RT pin to GND. An internal regulator provides power to the control cir- cuitry. The bias regulator normally draws power from the VIN pin, but if the BIAS pin is connected to an external voltage 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 LTM8033 in shutdown, disconnecting the output and reducing the input current to less than 1μA. To further optimize efficiency, the LTM8033 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. The oscillator reduces the LTM8033’s operating frequency when the voltage at the ADJ pin is low. This frequency foldback helps to control the output current during start- up and overload. The LTM8033 contains a power good comparator which trips when the ADJ 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 external resistor to pull the PGOOD pin high. Power good is valid when the LTM8033 is enabled and VIN is above 3.6V. The LTM8033 is equipped with a thermal shutdown that will inhibit power switching at high junction temperatures. 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. |
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