S1172 datasheet(12/35 Pages) SII

12 / 35 page

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

S-1172 Series

Rev.2.2_01

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. 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. Refer to “ Electrical Characteristics” and “ Characteristics

(Typical Data)” for details.

3. Line regulation 







ΔVOUT1

ΔVIN•VOUT

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 (

ΔVOUT2)

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 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 or 5.5 V.

Vdrop = VIN1

− (VOUT3 × 0.98)

S1172 Datasheet(PDF) 12 Page - Seiko Instruments Inc

S1172 Datasheet(HTML) 12 Page - Seiko Instruments Inc

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