S-1312A31-A4T1U3

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

The ABLIC S-1312A31-A4T1U3 is a CMOS linear voltage regulator featuring a fixed 3.1 V output and a maximum continuous output current of 150 mA. It operates within an input voltage range of 1.5 V to 5.5 V and maintains high accuracy with ±1.0% tolerance. The device incorporates built-in overcurrent protection and thermal shutdown circuits for enhanced reliability. It utilizes the HSNT-4 (0808) package, which measures 0.8 mm by 0.8 mm, ensuring compact integration in space-constrained designs.

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

• Integrates ON/OFF control logic with active high enable functionality
• Includes internal discharge shunt circuitry for rapid output capacitor discharge
• Features internal pull-down resistor on the ON/OFF pin for stable floating state management

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

• Constant-voltage power supply for portable communication devices
• Power regulation for battery-powered digital cameras
• Voltage regulation for digital audio players
• Power supply units for home electric appliances

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

Verify the specific ordering suffix against official documentation to confirm the package type and tape specifications. Ensure that the selected variant matches the required function list regarding discharge shunt and pull-down availability. Confirm environmental compliance status directly from the manufacturer datasheet before finalizing procurement orders.

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

Select this component when a fixed 3.1 V output is required alongside low quiescent current consumption. Consider the HSNT-4 (0808) package dimensions for board space optimization. Evaluate the need for the discharge shunt and pull-down functions inherent to the 'A' type designation during the design phase to ensure compatibility with system power management requirements.

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

This part belongs to the S-1312 Series developed using CMOS technology. The series is characterized by low dropout voltage and high ripple rejection capabilities. It supports ceramic capacitors of 0.22 μF or more for both input and output stabilization. The product line offers selectable output voltages in 0.05 V steps across a wide operating temperature range.

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

S-1312A31-M5T1U3: Same electrical specifications but housed in SOT-23-5 package.

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

What is the behavior of the ON/OFF pin when left floating?

For the S-1312 Series A type, the ON/OFF pin has an internal pull-down resistor connected to VSS. In a floating state, the pin defaults to the OFF level, setting the VOUT pin to the VSS level.

How does the discharge shunt function operate?

When the ON/OFF pin is set to the OFF level, the internal discharge shunt circuit activates. This allows the output capacitance to discharge rapidly to the VSS level, unlike types without this feature which rely on high-resistance internal dividers.