MAX667CSA

The MAX667CSA is one member of the MAX667 series.It has the following features including (1)350mV max dropout at 200mA,(2)normal mode: 20A typ quiescent current,shutdown mode: 0.2A typ quiescent current,(3)fixed +5V (min component count) or adjustable output,(4)dropout detector output.

The MAX667 low-dropout, positive, linear voltage regulator supplies up to 250mA of output current. With no load, it has a typical quiescent current of 20A. At 200mA of output current, the input/output voltage differential is typically 150mV. Other features include a lowvoltage detector to indicate power failure, as well as early-warning and low-dropout detectors to indicate an imminent loss of output voltage regulation. A shutdown control disables the output and puts the circuit into a low quiescent-current mode.The MAX667 employs Dual Mode™ operation. One mode uses internally trimmed feedback resistors to produce +5V. In the other mode, the output may be varied from +1.3V to +16V by connecting two external resistors.The MAX667 is a pin-compatible upgrade to the MAX666 in most applications where the input voltages are above +3.5V. Choose the MAX667 when high output currents and/or low dropout voltages are desired, as well as for improved performance at higher temperatures.

The minimum input-output differential, or dropout voltage,determines the regulator's lowest usable input voltage. In battery-operated systems, this determines  the useful end-of-life battery voltage. The MAX667 features very low dropout voltage (see electrical characteristics). In addition, the MAX667 has a dropout detector output, DD, that changes as the dropout voltage approaches its limit. DD is an open collector of a PNP transistor. The dropout voltage and the dropout detector both depend on the output current and temperature.When the input voltage is more than 300mV above the output voltage, the dropout detector will not conduct. As the differential decreases below 300mV, the DD source current increases abruptly. This current signals a warning that regulation is about to be lost.