S-1312B31-A4T1U3

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

The ABLIC S-1312B31-A4T1U3 is a positive voltage regulator IC from the S-1312 Series, manufactured using CMOS technology. It provides a fixed output voltage of 3.1 V with an accuracy of ±1.0%. The device supports an input voltage range of 1.5 V to 5.5 V and delivers up to 150 mA of output current. Key electrical characteristics include a typical dropout voltage of 160 mV at 100 mA, a ripple rejection of 70 dB typ., and low current consumption of 20 μA during operation. It features built-in overcurrent protection and thermal shutdown circuits.

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

• Built-in discharge shunt function for rapid output capacitor discharge when powered off
• Integrated overcurrent protection circuit to limit excessive output current
• Thermal shutdown circuit prevents damage caused by overheating
• ON/OFF control pin allows for significant reduction in current consumption

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

• Constant-voltage power supply for portable communication devices
• Constant-voltage power supply for digital cameras and digital audio players
• Constant-voltage power supply for battery-powered devices

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

Verify the specific product type B configuration, which includes a discharge shunt function but lacks a pull-down resistor on the ON/OFF pin. Confirm the HSNT-4 (0808) package designation matches the required footprint. Ensure the ordering suffix corresponds to the tape packing specification. Cross-reference the absolute maximum ratings against the application's peak input voltage and load conditions.

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

Select this component for applications requiring a fixed 3.1 V rail with ultra-low quiescent current. The B-type variant is suitable where discharge shunt functionality is needed but internal pull-down resistance is undesirable. Verify that the external ceramic capacitors meet the minimum capacitance requirement for stability. Consider the package power dissipation limits if operating near the maximum output current or high ambient temperatures.

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

This part belongs to the S-1312 Series of 5.5 V input, 150 mA voltage regulators developed by ABLIC Inc. The series utilizes CMOS technology to achieve low current consumption and high ripple rejection. The S-1312B31 specifically denotes the B-type function set with a 3.1 V output voltage, housed in the compact HSNT-4 (0808) surface-mount package.

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

S-1312B31-M5T1U3: Same electrical specifications and function type, but packaged in SOT-23-5 instead of HSNT-4 (0808).

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

What is the behavior of the ON/OFF pin for the S-1312B series?

For the S-1312B series, the ON/OFF pin does not have an internal pull-down resistor. It should not be left floating; if unused, it must be connected to the VIN pin.

How does the S-1312B series handle output discharge when turned off?

The S-1312B series includes a built-in discharge shunt function that actively discharges the output capacitance to the VSS level when the ON/OFF pin is set to the OFF level.