S-1111B19MC-NYETFG

Overview

The S-1111B19MC-NYETFG is a positive voltage regulator from the S-1111/1121 Series, developed using CMOS technology. It provides a fixed output voltage of 1.9 V with an accuracy of ±1.0%. The device features a low dropout voltage of 0.35 V typical at 100 mA and supports an output current of up to 150 mA when the input voltage is at least 1.0 V above the output. Current consumption is 35 μA typical during operation and 0.1 μA typical in power-off mode. It includes built-in overcurrent protection and an ON/OFF circuit. The component operates within an ambient temperature range of -40°C to +85°C and is housed in an SOT-23-5 package.

Feature Summary

• Built-in low on-resistance P-channel MOS FET output transistor enables low dropout voltage and high output current capability.
• Integrated overcurrent protection circuit limits output current to prevent damage to the internal output transistor.
• Dedicated ON/OFF pin controls regulator operation, significantly reducing current consumption when disabled to extend battery life.
• High ripple rejection ratio ensures stable output voltage against input noise variations.

Applications

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

Procurement Notes

Verify the specific ordering suffix NYE corresponds to the required ON/OFF logic type (Positive Logic) and environmental code (Lead-free, Sn 100%, halogen-free). Confirm that the SOT-23-5 package dimensions match the target PCB footprint. Ensure input and output capacitor selections meet the ESR requirements for stability, as specified in the datasheet electrical characteristics section.

Selection Notes

Select this component when a fixed 1.9 V output is required with high accuracy. Ensure the input voltage remains within the 2.0 V to 6.5 V range. Verify that the load current does not exceed 150 mA and that thermal dissipation constraints are met for the SOT-23-5 package. Consider the ON/OFF pin logic level compatibility with the controlling microcontroller or switch.

Part Context

This part belongs to the S-1111/1121 Series of high ripple-rejection low dropout CMOS voltage regulators manufactured by Seiko Instruments Inc. The series offers selectable output voltages from 1.5 V to 5.5 V in 0.1 V steps. The S-1111 variant differs from the S-1121 primarily in pin configuration, specifically the placement of the VIN and VOUT pins within the SOT-23-5 package.

Replacement Considerations

S-1111B19MC-NYATFx: Identical electrical specifications but utilizes negative logic for the ON/OFF pin instead of positive logic.

FAQ

What is the recommended output capacitor type for stable operation?

A tantalum capacitor with a capacitance of 2.2 μF or more is recommended. The equivalent series resistance (ESR) should ideally be between 0.5 Ω and 5 Ω to ensure phase compensation stability.

How does the ON/OFF pin function in the S-1111B19MC-NYETFG?

The 'NY' suffix indicates Type B, which uses positive logic. The regulator operates when the ON/OFF pin voltage is high (≥1.5 V) and stops operating when the voltage is low (≤0.3 V), reducing current consumption to the power-off level.