S-1121B32MC-N2RTFG

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

The S-1121B32MC-N2RTFG is a fixed positive LDO regulator from the S-1121 series by ABLIC (formerly Seiko Instruments). It provides a nominal output voltage of 3.2 V with ±1.0% accuracy. The device features a typical dropout voltage of 0.20 V at 100 mA and supports an output current up to 150 mA. Key electrical parameters include a ripple rejection of 70 dB at 1.0 kHz, operating current consumption of 35 μA typ., and power-off current of 0.1 μA typ. It operates within an ambient temperature range of -40°C to +85°C and utilizes a lead-free SOT-23-5 package.

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

• Built-in overcurrent protection circuit limits output transistor current.
• Integrated ON/OFF control pin enables significant reduction in current consumption during standby.
• Low on-resistance P-channel MOS FET output transistor ensures low dropout voltage.
• High ripple rejection capability for stable operation in noisy environments.

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

• Power supply for battery-powered devices
• Power supply for personal communication devices
• Power supply for home electric/electronic appliances

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

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance and environmental codes match project requirements. Ensure input/output capacitor selection adheres to datasheet stability guidelines, specifically regarding ESR ranges. Validate thermal dissipation constraints based on PCB mounting conditions before finalizing procurement quantities.

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

Select this component when a fixed 3.2 V rail is required with high accuracy. Consider the S-1121 series architecture for its low quiescent current and integrated shutdown feature. Evaluate thermal performance under maximum load conditions, as power dissipation limits apply. Ensure the application does not require reverse current flow protection beyond the internal parasitic diode characteristics.

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

This part belongs to the S-1121 series of high ripple-rejection low dropout CMOS voltage regulators manufactured by ABLIC. The series is characterized by fixed output voltages selectable in 0.1 V steps ranging from 1.5 V to 5.5 V. It shares architectural similarities with the S-1111 series but differs in pin configuration, specifically the placement of the VIN and VOUT pins within the SOT-23-5 package.

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

S-1121B32MC-N2STFG

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

What is the logic level for the ON/OFF pin on the S-1121B32MC-N2RTFG?

The 'B' suffix indicates positive logic, where a High voltage turns the regulator ON and a Low voltage turns it OFF.

Is an external output capacitor required for stability?

Yes, a tantalum capacitor of 2.2 μF or more is recommended between the VOUT and VSS pins to ensure stable operation due to phase compensation requirements.