S1711 datasheet(21/44 Pages) SII

21 / 44 page

SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR

Rev.3.1_00

S-1711 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-1711 Series enables use of a low ESR

capacitor, such as a ceramic capacitor, for the output capacitor CL1, CL2. ESR of 1.0

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) (Per

circuit)” 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 =

VOUT(S)

+ 1.0 V.

Vdrop

= VIN1 − (VOUT3 × 0.98)

S1711 Datasheet(PDF) 21 Page - Seiko Instruments Inc