Datasheet
Application information L4993
16/32 Doc ID 13517 Rev 8
3 Application information
Figure 24. L4993 application schematic
Note: The input capacitor Cs > 200nF is necessary for the smoothing of line disturbances. The
output capacitor C01 > 100nF is necessary for the stability of the regulation loop. In order to
damp output voltage oscillations during high load current surges, it is recommended put an
additional electrolytic capacitor C02 > 10µF at the output pin.
3.1 Voltage regulator
Voltage regulator uses a p-channel transistor as a regulating element. With this structure,
very low dropout voltage at current up to 500mA is obtained. The output voltage is regulated
up to transient input supply voltage of 40V. No functional interruption due to over-voltage
pulses is generated. A short circuit protection to GND is provided. The voltage regulator
watchdog functionality can be disabled by putting WEn low.
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