Power Management ICs

6.5 V Input, 300 mA Voltage Regulator S-1131 Series

The S-1131 Series is a positive voltage regulator with a low dropout voltage (LDO), high output voltage accuracy, and low current consumption developed based on CMOS technology.
A built-in low on-resistance transistor provides a low dropout voltage and large output current, and a built-in overcurrent protector prevents the load current from exceeding the current capacitance of the output transistor. An ON/OFF circuit ensures a long battery life, and small SOT-89-3, SOT-89-5 and 6-Pin HSON(A) packages realize high-density mounting.


Output voltage
1.5 V to 5.5 V, selectable in 0.1 V steps.
High-accuracy output voltage
Low dropout voltage (LDO)
250 mV typ. (3.0 V output product, Iout =100 mA)
Low current consumption
During operation 35 µA typ. 65 µA max.,
During shutdown: 0.1 µA typ. 1.0 µA max.
High peak current capability
300 mA output is possible (@ Vin >Vout(S) +1.0 V) *1
Built-in ON/OFF circuit
Ensures long battery life.
High ripple rejection
70 dB typ. (@ 1.0 kHz)
Built-in overcurrent protector
Overcurrent of output transistor can be restricted.
Lead-free products

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


  • Power supply for DVD and CD-ROM drives
  • Power supply for battery-powered devices
  • Power supply for personal communication devices
  • Power supply for note PCs

Standard Circuit

Standard Circuit