Preliminary Datasheet

LP2206

LP2206–00 Version 1.0 May.-2014

www.lowpowersemi.com

Page 7 of 8

Application Information

L

ike 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

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

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: