MIC39300/39301
Micrel
Minimum Load Current
Enable Input
The MIC39300/1 regulator is specified between finite loads.
If the output current is too small, leakage currents dominate
and the output voltage rises. A 10mA minimum load current
is necessary for proper regulation.
The MIC39301 version features an enable input for on/off
control of the device. Its shutdown state draws “zero” current
(only microamperes of leakage). The enable input is TTL/
CMOS compatible for simple logic interface, but can be
connected to up to 20V. When enabled, it draws approxi-
mately 15µA.
Error Flag
The MIC39301 version features an error flag circuit which
monitors the output voltage and signals an error condition
whenthevoltagedrops5%belowthenominaloutputvoltage.
The error flag is an open-collector output that can sink 10mA
during a fault condition.
Low output voltage can be caused by a number of problems,
including an overcurrent fault (device in current limit) or low
input voltage. The flag is inoperative during overtemperature
shutdown.
March 2000
9
MIC39300/39301
MICREL [ MICREL SEMICONDUCTOR ]
