ST111 datasheet(9/23 Pages) SII

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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR

Rev.3.1_00

S-T111 Series

Seiko Instruments Inc.



Explanation of Terms

1. Low dropout voltage regulator

This voltage regulator has the low dropout voltage due to its built-in low on-resistance transistor.

2. Low ESR

A capacitor whose ESR (Equivalent Series Resistance) is low. The S-T111 Series enables use of a low

ESR capacitor, such as a ceramic capacitor, for the output-side capacitor (CL). A capacitor whose ESR

is 10

Ω or less can be used.

3. Output voltage (VOUT)

The accuracy of the output voltage is ensured at

±1.0% under the specified conditions of fixed input

voltage

*1, fixed output current, and fixed temperature.

*1. Differs depending on the product.

Caution If the above conditions change, the output voltage value may vary and exceed the

accuracy range of the output voltage. Refer to “ Electrical Characteristics” and “

Characteristics (Typical Data)” for details.

4. Line Regulation 







ΔVOUT1

ΔVIN • VOUT

Indicates the dependency of the output voltage on the input voltage. That is, the values show how

much the output voltage changes due to a change in the input voltage with the output current remaining

unchanged.

5. Load regulation (

ΔVOUT2)

Indicates the dependency of the output voltage on the output current. That is, the values show how

much the output voltage changes due to a change in the output current with the input voltage remaining

unchanged.

6. Dropout voltage (Vdrop)

Indicates the difference between input voltage (VIN1) and the output voltage when; decreasing input

voltage (VIN) gradually until the output voltage has dropped out to the value of 98% of output voltage

(VOUT3), which is at VIN = (VOUT3

× 0.98).

Vdrop = VIN1

− (VOUT3 × 0.98)

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