S-1333C11-A4T1U3

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

The S-1333C11-A4T1U3 is a positive voltage regulator IC from the S-1333 Series, manufactured by ABLIC Inc. using CMOS technology. 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 (±15 mV for outputs below 1.5 V). The device supports up to 300 mA output current and maintains low current consumption of 25 μA typical during operation. Key electrical parameters include a dropout voltage of 0.54 V typical at 100 mA, ripple rejection of 75 dB typical at 1.0 kHz, and an operating temperature range of -40°C to +85°C. It is housed in an HSNT-4 (0808) package.

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

• Built-in overcurrent protection circuit limits excessive output current to protect the output transistor.
• Integrated thermal shutdown circuit prevents damage caused by overheating by stopping regulation at high junction temperatures.
• Includes an ON/OFF control function that significantly reduces current consumption when disabled.
• Capable of stabilizing operation using ceramic capacitors of 1.0 μF or more for both input and output.

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 ordering suffix against the manufacturer's datasheet to confirm the package type and environmental compliance. Ensure the selected variant matches the required output voltage step and functional configuration, such as discharge shunt or pull-down resistor availability. Confirm lead times and minimum order quantities directly with authorized distributors or the manufacturer before placing orders.

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

Select this component based on the required fixed output voltage within the 1.0 V to 3.5 V range and the necessary package footprint. Consider the internal functional types (A, B, C, or D) regarding the presence of discharge shunt and pull-down resistor features. Evaluate the power dissipation capabilities relative to the expected load current and ambient temperature conditions to ensure reliable operation within the specified thermal limits.

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

This part belongs to the S-1333 Series of 5.5 V input, 300 mA voltage regulators developed by ABLIC Inc. The series utilizes CMOS technology to achieve low current consumption and high ripple rejection. Variants are distinguished by product types (A-D) defining internal logic functions and packages including SOT-23-5 and HSNT-4 configurations.

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

Direct substitutes within the same series include S-1333C12-A4T1U3 (1.2 V), S-1333C18-A4T1U3 (1.8 V), S-1333C25-A4T1U3 (2.5 V), and S-1333C33-A4T1U3 (3.3 V), all sharing the C-type functionality and HSNT-4 (0808) package.

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

What is the behavior of the output voltage when the ON/OFF pin is set to the OFF level?

When the ON/OFF pin is set to the OFF level, the entire internal circuit stops operating, and the built-in P-channel MOS FET output transistor turns off. For the S-1333C type, the output voltage drops to the VSS level through internal divided resistors.

Does the S-1333C11-A4T1U3 have a discharge shunt function?

No, the S-1333 Series C type does not have a built-in discharge shunt circuit. Only Series A and B types include this feature to rapidly discharge the output capacitance when turned off.

What external components are recommended for stable operation?

The datasheet recommends using a ceramic capacitor of 1.0 μF or more for both the input (CIN) and output (CL) capacitors to stabilize the regulator and prevent oscillation across the entire temperature range.