The ESR of the SMD output ceramic capacitor has a negligible effect on the stability of the L99VR02J for

capacitors with low ESR. A ceramic SMD capacitor is recommended on the VO pin.

4.1

Voltage regulator

The voltage regulator uses a p-channel MOS transistor as a regulating element. With this structure, a very

low dropout voltage at current up to IO = 500 mA is obtained. The high-precision of the output voltage (±2%)

is obtained with a pretrimmed reference voltage. The voltage regulator automatically adapts its own quiescent

current to the output current level. In light load conditions, the quiescent current goes down to Iqn_LL = 105 µA

(low consumption mode). L99VR02J operates with reduced input voltage (post regulation) minimizing the internal

power dissipation and maximizing the output current.

4.2

Output current limitation

Output current limitation is present to protect the regulator and the application from the overload condition, such

as short to ground.

Figure 33. Behavior of output current versus regulated voltage VO

The Ishort current can be set in the range from 220mA (typ) to 815mA (typ). This through an external resistor Rsh

connected between the Ishort pin and the ground.

Figure 34. Ishort versus Rsh

L99VR02J

Voltage regulator

DS14076 - Rev 1

page 19/38