S-13R1C37-M5T1U3

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

The S-13R1C37-M5T1U3 is a CMOS positive voltage regulator IC from the S-13R1 Series, manufactured by ABLIC Inc. It provides a fixed output voltage of 3.7 V with an output current capacity of 150 mA and operates within an input voltage range of 2.0 V to 5.5 V. The device features ultra-low current consumption of 5 μA typ. during operation and includes reverse current protection limiting leakage to 0.09 μA max. It incorporates built-in overcurrent protection and thermal shutdown circuits for reliability. The component is housed in a SOT-23-5 package and supports ceramic capacitors of 1.0 μF or more for both input and output stabilization.

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 external protection diodes.
• Integrated overcurrent protection circuit limits excessive load currents to protect the internal output transistor.
• Thermal shutdown circuit automatically stops regulation when junction temperature exceeds safe operating limits to prevent damage.
• Supports stable operation using only ceramic capacitors of 1.0 μF or more for both input and output stages.

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

• Constant-voltage power supply for battery-powered devices
• Power management for portable equipment
• Voltage regulation for home electric appliances
• Power supply circuits for mobile phones

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

Verify the specific product type suffix (C) to confirm the presence of the constant current source pull-down function and absence of the discharge shunt function. Ensure the ordering code matches the required SOT-23-5 package configuration. Confirm environmental compliance specifications such as lead-free and halogen-free status before finalizing procurement orders.

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

Select this component when a fixed 3.7 V output is required with low quiescent current consumption. The C-type designation indicates specific ON/OFF pin behaviors including a constant current source pull-down but no discharge shunt function. Evaluate thermal dissipation requirements carefully if operating near maximum load currents or high ambient temperatures.

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

This part belongs to the S-13R1 Series developed using CMOS technology. The series is characterized by low dropout voltage, high accuracy, and high ripple rejection capabilities. It is designed for applications requiring efficient power management with minimal standby current consumption while maintaining robust protection features against electrical faults.

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

S-13R1D37-M5T1U3: Offers identical electrical performance but lacks the constant current source pull-down feature on the ON/OFF pin.

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 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 S-13R1C37 handle the output voltage when the ON/OFF pin is set to OFF?

In the C-type variant, the ON/OFF pin has an internal constant current source pull-down. When turned off, the output transistor turns off, but the output capacitor is not actively discharged by a shunt circuit.

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

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