L6935 STMicroelectronics, L6935 Datasheet - Page 14

• Manufacturer Part Number: L6935
• Description: High performance 3 A ULDO linear regulator
• Manufacturer: STMicroelectronics

Specifications of L6935

• Adjustable Output Voltage: 0.5 V to 3.0 V
• Excellent Load And Line Regulation: 1 % accuracy (over temperature)

Application information
6
6.1
6.1.1
6.1.2
14/20
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.
V
V
V
Components selection
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.
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:
examples.
Table 6.
1. xxx in the part numbers stands for 106 (10 µF), 226 (22 µF)... 105 (100 µF)
Murata - GRM31CR61ExxxK
Panasonic - ECJ3YB1AxxxM
Panasonic - EEFFD0HxxxR
Sanyo - 8TPE100MPC2
TDK - C3216X5R0JxxxMT
IN
IN
IN
< V
can be separated by V
get lower, according to the relationship P
BIAS
Manufacturer
, resulting in a better performance. In fact, the power dissipated decreases as
Input/output capacitor selection guide
BIAS
(1)
: in this way the device can regulate the output voltage even if
MLCC, SMD1206, X5R
MLCC, SMD1206, X5R
MLCC, SMD1210, X5R
POSCAP, SMD6032
SPCap - SMD7343
28 mΩ ESR
25 mΩ ESR
Type
DISS
= (V
IN
Table 6.
- V
OUT
I/O cap. value Rated voltage
) x I
shows a few tested
10...100 µF
10...100 µF
10...100 µF
10...100 µF
10...100 µF
OUT
.
6.3 - 25 V
6.3 - 25 V
10 - 25 V
4 - 8 V
6.3 V
L6935