The input capacitor C1 is necessary as backup supply for short battery voltage interruption, which may occur on

the line. Its value, should be chosen according to the relevant application requirement. The second input capacitor

C2 ≥ 220 nF is needed when the C1 is too distant from the VS pin and it compensates smooth line disturbances.

The C0 ceramic capacitor, connected to the output pin, is for bypassing to GND the high-frequency noise and it

guarantees stability even during sudden line and load variations. Suggested value is C0 = 220 nF with ESR ≥ 100

mΩ. Stability region is reported in the figure below.

Figure 22. Stability region

0.01

0.10

1.00

10.00

0.22

0.47

1.00

2.20

3.30

4.70

10.00

Co (µF)

STABILITY REGION

UNTESTED REGION

ESR min

Figure 23. Maximum load variation response

3.2

Enable

L5050 features enable input (two enable input pins for the L5050SD, one for each voltage regulator).

A high voltage level at the enable input pin switches the regulator element ON. In standby mode, with the

enable input pin low, the regulator output is disabled and the current consumption of the corresponding regulator

(quiescent current) is typically 5 μA.

L5050

Enable

DS13704 - Rev 3

page 13/25