LTC3100
21
3100fb
For more information www.linear.com/LTC3100
APPLICATIONS INFORMATION
LDO Output Capacitor Selection
The LDO is designed to be stable with a minimum 1礔
output capacitor. No series resistor is required when using
low ESR capacitors. For most applications, a 2.2礔 ceramic
capacitor is recommended. Larger values will improve
transient response, and raise the power supply rejection
ratio (PSRR) of the LDO. Refer to the Typical Performance
Characteristics for the allowable range of output capacitor
to ensure loop stability.
LDO Output Voltage Programming
The output voltage is set by a resistive divider according
to the following formula:
V
OUT
=0.600V" 1+
R4
R3
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
The external divider is connected to the output as shown
in the Block Diagram. For improved transient response,
a feedforward capacitor may be placed in parallel with
resistor R4.
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