Switching regulator with programmable output levels using a single input pin
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United States of America Patent
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May 15, 2007
Grant Date -
N/A
app pub date -
May 1, 2006
filing date -
May 1, 2006
priority date (Note) -
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Abstract
A switching regulator provides programming output current control through a single input terminal by modifying the reference voltage in the control loop of the switching regulator. The switching regulator includes a first input terminal receiving a program input voltage indicative of a desired output current, a voltage divider receiving a first reference voltage and providing a second reference voltage at a first node between the first and second resistors and a third reference voltage at a second node between the second and third resistors, and a precision active pulldown circuit coupled to receive the program input voltage and operative to pull down the second reference voltage at the first node in response to the program input voltage. In operation, the third reference voltage is used in the control loop of the switching regulator to control the output current of the switching regulator in response to the program input voltage.
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