MIC5320-SPYMT-TR

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MIC5320-SPYMT-TR – Application Field and Working Principle

The MIC5320-SPYMT-TR is a series of step-down switching regulators belonging to the family of linear voltage regulators in the Power Management Integrated Circuits (PMIC). It is specifically designed for providing high current with low noise and is efficient to the point of allowing a low quiescent current mode, the so-called pulse-skip mode, to conserve energy when small loads are detected. MIC5320-SPYMT-TR controllers feature current-mode, constant frequency control and all the protections embedded into a seamlessly integrated circuit.

Overview

The MIC5320-SPYMT-TR is an easy-to-use, low-noise, high-current, constant frequency, step-down switching regulator. Combination of its tight tolerance line and load regulation, fast transient response and accurate current limit, the MIC5320-SPYMT-TR offers the user design flexibility for a wide range of applications. It is available in a 3-pin TO-220 and a 5-pin TSOT-23-5 packages, making it ideal for applications such as point-of-load and low-voltage supplies.

Features

• Low quiescent current: 0.7mA typical in pulse-skip mode
• Input voltage range: 3V to 14V
• Output voltage range: 0.8V to 5.5V
• Selectable fast or slow current-limit
• Integrated overvoltage, short-circuit and thermal shutdown
• Programmable frequency range of 200kHz to 1.2MHz
• Integrated low-side MOSFET with 0.5Ω (typical) on resistance
• Compatible with many popular reference voltage
• Output voltage accuracy of ±1.5% over line, load and temperature
• Pre-biased output startup capability

Applications

The MIC5320-SPYMT-TR is ideally suited for medium-to-high current, medium-to-low voltage applications such as:

• 5V and 3.3V Point-of-Load applications
• Supplies for Mobile Applications
• Battery-Powered Equipment and Portable Electronics
• Communication Systems and Industrial Process Control
• MP3 Players and Notebook Computers
• Networking and USB Applications, Consumer Electronics

Working Principle

The MIC5320-SPYMT-TR is a high current, step-down switching regulator. It is capable of operating from an input voltage range between 3V to 14V, and the output voltage can be adjusted from 0.8V to 5.5V using a single control pin. It provides a Constant-On-Time Frequency Control scheme to regulate the load voltage accurately. The wide output voltage range and high output current allows the regulator to work with many popular references in addition to its own internal 5V enable and 3.3V trim reference.

The MIC5320-SPYMT-TR operates in Fixed-Frequency (FF) mode when it is enabled by an enable input pin EN. During the enable period, the MIC5320-SPYMT-TR runs in continuous conduction mode and hysteresis current limit to keep the load current at a desired level. When the enable signal is turned off, the regulator enters Pulse-Skip (PS) mode, where the on-time is reduced to a minimum, which yields a very low quiescent current.

The slew rate of the output voltage ripple is mainly determined by the output inductor and output capacitor. The MIC5320-SPYMT-TR requires several external components. The inductor, output capacitors, sense resistor and input capacitors must be chosen according to their specific requirements and application. All these components are necessary for a proper operation, circuit stability and protection of the device.

Conclusion

The MIC5320-SPYMT-TR is a series of step-down switching regulators designed to provide high current with low noise and high efficiency. It can accept an input voltage range from 3V to 14V and allows an output voltage between 0.8V to 5.5V, making it suitable for many applications. With its wide range of features and its simple configuration, the MIC5320-SPYMT-TR is an ideal choice for Power Management Integrated Circuits (PMIC).

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