LP2206 Datasheet, PDF (7/8 Pages) Lowpower Semiconductor inc – Wide Operating Voltage Ranges : 2.5V to 6.0V

Application Information
Like any low-dropout regulator, the external
capacitors used with the LP2206 must be carefully
selected for regulator stability and performance.
Using a capacitor whose value is > 2µF on the
LP2206 input and the amount of capacitance can be
increased without limit. The input capacitor must be
located a distance of not more than 0.5 inch from the
input pin of the IC and returned to a clean analog
ground. Any good quality ceramic or tantalum can be
used for this capacitor. The capacitor with larger
value and lower ESR (equivalent series resistance)
provides better PSRR and line-transient response.
The output capacitor must meet both requirements
for minimum amount of capacitance and ESR in all
LDOs application. The LP2206 is designed
specifically to work with low ESR ceramic output
capacitor in space-saving and performance
consideration. Using a ceramic capacitor whose
value is at least 1µF with ESR is > 25mΩ on
theLP2206 output ensures stability. The LP2206 still
works well with output capacitor of other types due to
the wide stable ESR range. Output capacitor of
larger capacitance can reduce noise and improve
load transient response. The output capacitor should
Preliminary Datasheet
LP2206
be located no more than 0.5 inch from the V_OUT pin of
the LP2206 and returned to a clean analog ground.
Start-up Function Enable Function
The LP2206 features an LDO regulator
enable/disable function. To ensure the LDO regulator
will switch on, the EN turn on control level must be
greater than 1.4 volts. The LDO regulator will go into
the shutdown mode when the voltage on the EN pin
falls below 0.4 volts. To protect the system, the
LP2206 have a quick-discharge function. If the
enable function is not needed in a specific
application, it may be tied to V_IN to keep the LDO
regulator in a continuously on state mode.
Setting the Output Voltage
Set the output voltage by selecting the resistive
voltage divider ratio. The voltage divider drops the
output voltage to the 0.8V feedback voltage. Use a
100K resistor for R2 of the voltage divider. Determine
the high-side resistor R1 by the equation:
Vout=(R1/R2+1) × V_FB
LP2206–00 Version 1.0 May.-2014 Email: [e-mail] www.lowpowersemi.com
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