XB1117 datasheet(7/13 Pages) TOREX

Part #	XB1117

Description	1A Low Dropout Positive Voltage Regulator

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Manufacturer	TOREX [Torex Semiconductor]

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XB1117

Series

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OPERATIONAL EXPLANATION

1. Output voltage adjustment

The XB1117 series provide a stable output by comparing the output voltage to an internal reference voltage. With the

adjustable XB1117K type, a 1.25V reference voltage (VREF) is fixed between the VOUT pin and the ADJ pin and the external

resistors R1 and R2 are used to set the output voltage. The resistance values of R1 and R2 should be set so as to provide a

minimum load current of 10mA. The output voltage is given by the following equation.

VOUT=VREF(1+R2/R1)+IADJ x R2

The output voltage of the XB1117P type is internally fixed to 1.8V, 2.5V, 3.3V, and 5.0V so external resistors are not

necessary.

2. Stability and load regulation

The XB1117 series requires a load capacitor between the VOUT pin and the GND pin to provide phase compensation thereby

ensuring stability of the output voltage. Either a tantalum capacitor of more than 10μF (TYP.) or an aluminum electrolytic

capacitor of more than 50μF (TYP.) should be connected.

(Note : The capacitor's ESR value should not exceed 0.5Ω.)

The output capacitor does not have a theoretical upper limit so increasing its value will increase stability. CL=100μF or

more is typical for high current regulator design.

In order to avoid any reductions in output voltage accuracy with the XB1117K type, we recommend not to place a parasitic

resistor (Rp) between the VOUT pin and the divider resistor R1. The parasitic resistor (Rp) does not influence the output

however if the divider resistor R1 is directly connected to the VOUT pin.

With the XB1117P type, although external resistor (R1) is internally connected to the VOUT pin, stability can be maintained by

not wiring a parasitic resistor to the GND pin.

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