S-13R1B21-A4T2U3

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The S-13R1B21-A4T2U3 is a CMOS positive voltage regulator from the S-13R1 Series, manufactured by ABLIC Inc. It provides a fixed output voltage of 2.1 V with an accuracy of ±1.0%. The device supports an input voltage range of 2.0 V to 5.5 V and delivers up to 150 mA of output current. Key electrical characteristics include a typical dropout voltage of 280 mV at 100 mA, a ripple rejection ratio of 70 dB, and low current consumption of 5 μA during operation. It features built-in reverse current protection, overcurrent protection, and thermal shutdown circuits.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Built-in reverse current protection function prevents current flow from the output pin to the input pin without requiring an external IC protection diode.
• Integrated discharge shunt circuit rapidly discharges the output capacitance when the ON/OFF pin is set to the OFF level.
• Includes overcurrent protection and thermal shutdown circuits to prevent damage from excessive load currents or overheating.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Constant-voltage power supply for battery-powered devices
• Constant-voltage power supply for portable equipment
• Constant-voltage power supply for home electric appliances

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific package type HSNT-4 (1010) and the B-type functional configuration against the datasheet before procurement. Confirm that the required output voltage of 2.1 V is available in this series, as standard listings may vary. Ensure environmental compliance requirements match the lead-free and halogen-free specifications provided by the manufacturer.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component for applications requiring a fixed 2.1 V output with high accuracy and low quiescent current. The B-type variant is suitable when a discharge shunt function is needed but a constant current source pull-down on the ON/OFF pin is not required. Ensure input and output ceramic capacitors of 1.0 μF or more are used for stability.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the S-13R1 Series, which utilizes CMOS technology to achieve low dropout voltage and high ripple rejection. The series offers various output voltages selectable in 0.05 V steps and multiple package options including SOT-23-5, SC-82AB, and HSNT-4. The B-type designation indicates specific internal logic and protection features distinct from other series variants.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

S-13R1B21-M5T1U3

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators FAQ

What is the maximum reverse current allowed when the output voltage exceeds the input voltage?

The reverse current flowing from the VOUT pin to the VIN pin is controlled to a maximum value of 0.09 μA due to the built-in reverse current protection function.

How does the S-13R1B21-A4T2U3 handle the output voltage when the ON/OFF pin is turned off?

As a B-type device, it includes a discharge shunt function that actively discharges the output capacitor, allowing the VOUT pin to reach the VSS level rapidly.