Does the HT77XX series of devices have a chip enable pin?
Answer Only the SOT25 packages in the HT77XX series have a chip enable pin. The SOT25 package types have 5 pins, CE, NC, GND, LX and VOUT. The CE pin is the chip enable pin. The other package types, TO92 and SOT89, have only 3 pins, GND, LX and VOUT, but no CE pin. The CE chip enable pin, controls whether the HT77XX enters its normal operating mode or whether it enters the shutdown mode. In the shutdown mode the HT77XX’s internal functions, such as reference block, gain block and feedback control block are all switched off, which reduces the device’s current consumption to very low levels, around 0.5uA.When the device is shutdown, the HT77XX output voltage will be equal to the input voltage minus the Schottky diode voltage. This output voltage will slowly fall according to the values of the output capacitor and load. Because this output voltage cannot fall to zero quickly, it is necessary to use the external circuitry to do so, such as that which is shown in the diagram where an extern
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