Power Management ICs

6.5 V Input, 150 mA, 2-circuit Voltage Regulator S-1721 Series

S-1721 Series, developed using the CMOS technology, is a 2-channel positive voltage regulator IC which has the low dropout voltage, the high-accuracy output voltage and the low output current consumption of 150mA. Users are able to use a small ceramic capacitor of 1.0 µF for this IC. This IC includes two regulator circuits in the package SOT-23-6 or super-small SNT-6A. S-1721 Series has much lower current consumption than S-1711 Series, this IC is ideal for mobile devices.


Output voltage
1.2 V to 5.0 V, selectable in 0.05 V step
Input voltage
1.7 V to 6.5 V
Output voltage accuracy
Dropout voltage
130 mV typ. (3.0 V output product, Iout = 100 mA)
Current consumption
During operation: 25 μA typ., 45 μA max. (3.0 V output product, per circuit)
During power-off: 0.1 μA typ., 1.0 μA max.
Output current
Possible to output 150 mA (VinVout(s) +1.0 V)*1 (per circuit)
Input and output capacitors
A ceramic capacitor of 1.0 μF or more can be used.
Ripple rejection
80 dB typ. (products having the output under 1.8 V, f = 1.0 kHz)
Built-in overcurrent protection circuit
Iimits overcurrent of output transistor.
Built-in ON/OFF circuit
Ensures long battery life.
Pull-up or pull-down resistor is selectable.
Operation temperature range
Ta = −40°C to +85°C
Lead-free, Sn 100%, halogen-free

*1. Attention should be paid to the power dissipation of the package when the output current is large.


  • Power supply for cellular phones
  • Power supply for battery-powered devices

Standard Circuit

Standard Circuit

Parts List

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