S-13R1C21-I4T1U3

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

The S-13R1C21-I4T1U3 is a CMOS LDO voltage regulator from the S-13R1 Series by ABLIC Inc. It provides a fixed output voltage of 2.1 V with an accuracy of ±1.0%. The device supports a maximum output current of 150 mA and operates within an input voltage range of 2.0 V to 5.5 V. Key electrical characteristics include a typical dropout voltage of 0.28 V at 100 mA, a ripple rejection ratio of 70 dB typ., and a quiescent current of 5 μA typ. during operation. It features reverse current protection limiting leakage to 0.09 μA max.

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

• Built-in reverse current protection function prevents current flow from the VOUT pin to the VIN pin without requiring an external IC protection diode.
• Integrated overcurrent protection circuit limits output current to protect the load transistor, accompanied by a thermal shutdown circuit that halts regulation upon overheating.
• Includes an ON/OFF control circuit that significantly reduces current consumption when disabled, ensuring extended battery life in portable applications.

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
• Constant-voltage power supply for mobile phones

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

Verify the specific package type (SC-82AB) and environmental code (U for lead-free/halogen-free) against the datasheet specifications. Confirm the functional variant corresponds to Series C type regarding discharge shunt and pull-down capabilities. Ensure input and output capacitors meet the minimum capacitance requirements for stability.

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

Select this component for applications requiring low quiescent current and high ripple rejection. Verify that the required output voltage falls within the selectable range and that the package thermal dissipation can handle the expected load current. Consider the Series C configuration if discharge shunt functionality is not needed but constant current source pull-down is desired.

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 accuracy. 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 Series C designation indicates specific internal logic regarding the ON/OFF pin behavior and discharge functions.

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

S-13R1C21-N4T1U3

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

What is the maximum reverse current allowed when VOUT exceeds VIN?

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

How does the Series C type differ from other types regarding the ON/OFF pin?

Series C type has an unavailable discharge shunt function but includes a constant current source pull-down function. The ON/OFF pin is internally pulled down to the VSS pin in the floating status.

What are the conditions for the thermal shutdown circuit to operate?

The thermal shutdown circuit operates when the junction temperature rises to approximately 150°C, stopping regulation. It releases and restarts regulation when the temperature drops to approximately 120°C.