S-1172 Datasheet, PDF (12/34 Pages) Seiko Instruments Inc – HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1172 Series
Rev.1.1_00
„ 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 (V_OUT)
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 V_OUT < 1.5 V : ±15 mV, When 1.5 V ≤ V_OUT : ±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 _ ^∆VOUT1 _
  ^{∆VIN • 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 (∆V_OUT2)
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 (V_drop)
Indicates the difference between the output voltage and the input voltage V_IN1, which is the input voltage (V_IN) when;
decreasing input voltage V_IN gradually until the output voltage has dropped to the value of 98% of output voltage
V_OUT3, which is at V_IN = V_OUT(S) + 1.0 V or 5.5 V.
V_drop = V_IN1 − (V_OUT3 × 0.98)
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Seiko Instruments Inc.