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Product Detailed Parameters
- Description：IC REG LINEAR 2.1V 150MA SOT23-5
- Series：S-1111
- Mfr：ABLIC Inc.
- Package：Tape & Reel (TR)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：6.5V
- Voltage - Output (Min/Fixed)：2.1V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.7V @ 100mA
- Current - Output：150mA
- Current - Quiescent (Iq)：1 µA
- Current - Supply (Max)：65 µA
- PSRR：70dB (1kHz)
- Control Features：Enable
- Protection Features：Over Current
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：SC-74A, SOT-753
- Supplier Device Package：SOT-23-5
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Overview
The S-1111B21MC-NYGTFG is a positive voltage regulator from the S-1111/1121 Series, developed using CMOS technology. It provides a fixed output voltage of 2.1 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 control circuit.
Feature Summary
- Built-in low on-resistance transistor enables low dropout voltage and large output current capability.
- Integrated overcurrent protection circuit limits load current to prevent damage to the output transistor.
- ON/OFF circuit allows for stopping internal operation to ensure extended battery life in portable devices.
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 component authenticity by checking manufacturer markings against official datasheet specifications. Confirm package type matches SOT-23-5 and environmental codes align with lead-free requirements. Ensure design compliance with absolute maximum ratings to avoid physical damage. Review application notes for capacitor selection to prevent oscillation due to ESR constraints.
Selection Notes
Select this component for applications requiring a fixed 2.1 V rail with high accuracy. Consider the S-1121 series if pin configuration differences are required. Evaluate thermal dissipation capabilities based on board mounting conditions. Ensure output capacitors meet ESR requirements for stability. Verify input voltage ranges accommodate the minimum dropout requirement under all operating loads.
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 is characterized by its low current consumption and high-accuracy output voltage options ranging from 1.5 V to 5.5 V. The S-1111 variant specifically defines the pinout configuration distinct from the S-1121 series.
Replacement Considerations
S-1121B21MC-NYATFx (Pin configuration differs)
FAQ
What is the recommended output capacitor type for stable operation?
A tantalum capacitor of 2.2 μF or more is recommended. If using ceramic or OS capacitors with low ESR, a series resistor of approximately 0.5 Ω to 5 Ω should be added to secure stability.
How does the ON/OFF pin function for the 'B' product type?
For the B product type, setting the ON/OFF pin to a High level turns the regulator ON, while setting it to a Low level turns it OFF, significantly reducing current consumption.
