2

Dual Input Ultra Low Dropout

Voltage Regulator (ULDO)

L1581 Series

TO-252

OCT-11-Y02

NIKO-SEM

Fixed Output Parts

330uF

C4

Vctrl

L1581X-2.5

3

5

4

1

OUT

Vin

CTR'L

SENSE

2.5V Vout

C1

330uF

C2

10uF

Vin

330uF

C4

Vctrl

L1581X-3.3

3

5

4

1

OUT

Vin

CTR'L

SENSE

C2

10uF

C1

330uF

Vin

3.3V Vout

NOTES :

(1) If the same voltage is input to both INPUT and CONTROL, then the dropout voltage will become 1.3V

maximum.

(2) A small (~0.033uF) capacitor can be used to bypass the ADJUST pin to improve transient response, if needed.

should be used. Increasing the value of the output capacitor will improve the overall transient response.