S-1155 datasheet(11/28 Pages) SII

11 / 28 page

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR

Rev.1.1_00

S-1155 Series

Seiko Instruments Inc.

Explanation of Terms

1. Low dropout voltage regulator

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

2. Output voltage (VOUT)

The accuracy of the output voltage is ensured at

±1.0% or ±15 mV

*2 under the specified conditions of fixed input

voltage

*1, fixed output current, and fixed temperature.

*1.

Differs depending on the product.

*2.

When VOUT < 1.5 V :

±15 mV, When 1.5 V ≤ VOUT : ±1.0%

Caution

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

range of the output voltage. See “ Electrical Characteristics” and “

Characteristics (Typical

Data)” for details.

3. Line regulation













•

∆

OUT

OUT1

Indicates the dependency of the output voltage against the input voltage. That is, the value shows how much the

output voltage changes due to a change in the input voltage after fixing output current constant.

4. Load regulation (

∆VOUT2)

Indicates the dependency of the output voltage against the output current. That is, the value shows how much the

output voltage changes due to a change in the output current after fixing output current constant.

5. Dropout voltage (Vdrop)

Indicates the difference between the output voltage and the input voltage VIN1, which is the input voltage (VIN) when;

decreasing input voltage VIN gradually until the output voltage has dropped to the value of 98% of output voltage

VOUT3, which is at VIN = VOUT(S)

+ 1.0 V or 5.5 V.

Vdrop = VIN1

− (VOUT3 × 0.98)

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