S-1312A11-A4T2U3

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

The S-1312A11-A4T2U3 is a CMOS positive voltage regulator IC from the S-1312 Series, manufactured by ABLIC Inc. It features an input voltage range of 1.5 V to 5.5 V and provides a fixed output voltage of 1.1 V with ±1.0% accuracy. The device supports up to 150 mA output current and operates within a temperature range of -40°C to +85°C. Key electrical characteristics include a typical dropout voltage of 160 mV at 100 mA, a ripple rejection ratio of 75 dB typ., and low current consumption of 20 μA during operation. It utilizes HSNT-4 (1010) packaging.

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

• Built-in overcurrent protection circuit limits excessive output current and protects against short circuits.
• Integrated thermal shutdown circuit prevents damage caused by overheating by stopping regulation at high junction temperatures.
• Includes an ON/OFF control pin that allows for active high logic control to start or stop the regulator, ensuring long battery life in portable devices.

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 home electric appliances

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

Verify the specific product type 'A' configuration, which includes both discharge shunt and pull-down resistor functions, matches the design requirements. Confirm the HSNT-4 (1010) package code corresponds to tape packing specifications. Ensure external ceramic capacitors of 0.22 μF or more are used for stability as per datasheet recommendations.

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

Select this component when a fixed 1.1 V output is required with high accuracy and low quiescent current. The 'A' type variant is suitable if internal discharge shunt and pull-down resistor functionalities are needed for system power management. Consider the 160 mV typical dropout voltage and ensure the input voltage remains sufficiently above the output level for proper regulation under load conditions.

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 using CMOS technology. The series offers selectable output voltages from 1.0 V to 3.5 V in 0.05 V steps. The 'A' designation indicates specific internal circuit configurations including active high ON/OFF logic, available discharge shunt function, and available pull-down resistor.

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

S-1312A11-M5T1U3 (Same electrical specs, different SOT-23-5 package)

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

What is the function of the ON/OFF pin on the S-1312A11-A4T2U3?

The ON/OFF pin controls the operation of the regulator. Setting it to a high level activates the regulator, while setting it to a low level stops operation, significantly reducing current consumption to extend battery life.

Does the S-1312A11-A4T2U3 have built-in protection circuits?

Yes, it includes an overcurrent protection circuit to limit output current during shorts and a thermal shutdown circuit that stops regulation if the junction temperature exceeds approximately 150°C.