S-1702 Datasheet, PDF (16/45 Pages) Seiko Instruments Inc – Built-in overcurrent protection circuit

SUPER-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
S-1702 Series
Rev.2.2_01
 Explanation of Terms
1. Regulator block
1. 1 Low dropout voltage regulator
This voltage regulator has the low dropout voltage due to its built-in low on-resistance transistor.
1. 2 Low ESR
A capacitor whose ESR (Equivalent Series Resistance) is low. The S-1702 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.
1. 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.
1. 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.
1. 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.
1. 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)
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