Application information

L6935

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6

Application information

L6935 is the best choice in smart linear regulator applications, due to its own small size,

high power delivered and high regulation accuracy. Furthermore thermal shut-down and

OCP guarantee the highest reliability for each application.

6.1

Components selection

6.1.1

Input capacitor

The choice of the input capacitor value depends on the several factor such as load transient

requirements, input source (battery or DC/DC converter) and its distance from the input

capacitor. Generally speaking, a capacitor with the lowest ESR possible should be chosen:

a value within the range [10

µF; 100 µF] can be sufficient in many cases.

6.1.2

Output capacitor

The choice of the output capacitor value basically depends on the load transient

requirement. Output capacitor must be sized according to the dynamic requests of the load.

A too small capacitor may exhibit huge voltage drop after a load transient is applied: a value

greater than 10

µF should be used.

In order to guarantee a good reliability, at least X5R type should be used as I/O capacitors.

Different kinds of input/output capacitors can be used: Table 6. shows a few tested

examples.

Table 6.

Input/output capacitor selection guide

Manufacturer

Type

I/O cap. value Rated voltage

1. xxx in the part numbers stands for 106 (10

µF), 226 (22 µF)... 105 (100 µF)

MLCC, SMD1206, X5R

10...100

µF

6.3 - 25 V

Panasonic - ECJ3YB1AxxxM

MLCC, SMD1206, X5R

10...100

µF

10 - 25 V

Panasonic - EEFFD0HxxxR

SPCap - SMD7343

28 m

Ω ESR

10...100

µF4 - 8 V

Sanyo - 8TPE100MPC2

POSCAP, SMD6032

25 m

Ω ESR

10...100

µF

6.3 - 25 V

TDK - C3216X5R0JxxxMT

MLCC, SMD1210, X5R

10...100

µF

6.3 V