MIC5231-5.0BM5-TR

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MIC5231-5.0BM5-TR Application Field and Working Principle

The MIC5231-5.0BM5-TR, from the MIC5231 family of low-dropout (LDO) linear regulators from Micrel Inc., is a three-terminal, miniature, adjustable and fixed output voltage device. It’s an optimized surface mount regulator in a SOT-23 package, featuring low dropout voltage, low noise, and low output voltage, making it an ideal choice for space-constrained applications that require an adjustable output voltage in the range of 0.8 V to 5.0 V. This regulator integrates a 700 mA RLC load switch, and is designed to provide a stable, low-noise output voltage.

Introduction

The MIC5231-5.0BM5-TR is a three-terminal LDO linear regulator capable of providing a stable and low-noise output voltage in the range of 0.8 V to 5.0 V regardless of input voltage fluctuations. This device is strongly protected against short circuits and over-current, and is designed with a wide input/output voltage range of 2.3 V to 6 V. Its output voltage can be adjusted by means of a single resistor and the low dropout voltage makes it suitable for low-power applications which require a precise and adjustable output voltage.

Features

The MIC5231-5.0BM5-TR includes the following features:

• On-chip trimming for accurate output voltage
• High current capability: up to 700 mA
• Low dropout voltage
• Low-noise operation: 0.2 µVrms
• Good line and load regulation
• Very low temperature coefficient: 0.015 %/°C
• High power-supply rejection ratio (PSRR): 50 dB at 1 kHz
• Short-circuit and over-current protection
• Low-power shutdown mode

Applications

The MIC5231-5.0BM5-TR is suitable for a variety of applications, such as:

• Battery-operated systems
• Portable communications
• Portable consumer electronics
• Handheld instrumentation
• Notebook computers
• DC-DC converters
• Power management in automotive systems

Working Principle

The basic goal of linear regulators is to provide a constant, low-ripple output voltage despite fluctuations in the input voltage, changes in the load characteristics, or any other parameters that might negatively impact the output voltage. To achieve this, linear regulators employ a wide variety of circuit configurations involving active or passive load-current compensation, self-biasing, output-current limiting, and feedback. The MIC5231-5.0BM5-TR uses an internal error amplifier, an internal PMOS pass device, and a unique self-biasing topology for low-noise operation.

The output voltage is monitored by the error amplifier, which compares it to an internal reference voltage and adjusts the pass device’s gate voltage accordingly, ensuring that a constant output voltage is maintained even with changes in load current or input voltage. The self-biasing topology of the MIC5231-5.0BM5-TR eliminates the need for an external bias current while still providing low-noise operation. Additionally, the output voltage can be trimmed externally, allowing the user to fine-tune the output voltage as needed.

Conclusion

The MIC5231-5.0BM5-TR is a three-terminal LDO linear regulator for low-power applications. It integrates a 700 mA RLC load switch, is strongly protected against short circuits and over-current, and is designed to provide a stable, low-noise output voltage in the range of 0.8 V to 5.0 V. Additionally, its output voltage can be trimmed externally for fine-tuning, and its low dropout voltage makes it ideal for portable and battery-operated applications which require adjustable output voltage.

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