LM2588S-12

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The LM2588S-12 device is a DC-DC step-up switching regulator in the buck-boost configuration, and provides 12 V regulated output from input voltages between 2.5 and 22 V. With internal current sense, fixed frequency oscillator and thermal shutdown, it is easy to use, high power and efficient. Its wide voltage range makes it suitable for automotive, handheld devices, battery chargers and other applications requiring wide-input voltage range.

Overview

The LM2588S-12 switching regulator IC is designed to produce a fixed 12 V output from an input voltage range of 2.5 to 22 V (including battery operation), with a load current of up to 3 A. It employs a fixed frequency oscillator which keeps output ripple small, and also provides additional loop protection. The device is designed to provide high efficiency with a low component count.

Application Field

The LM2588S-12 is widely used in automotive, handheld devices, battery chargers, and other applications that require wide input voltage ranges. Its wide operating temperature range and extended output voltage range (12 V fixed output) make it suitable for these applications.

Working Principle

The LM2588S-12 is a monolithic integrated circuit that features a self-contained step-up DC-DC converter. It is a synchronous switching regulator capable of providing a DC output voltage up to 12 V. The regulator includes an internal power MOSFET switch. It uses a fixed frequency modified pulse width modulation (PWM) control scheme and requires only two external components for operation.

The regulator operates in PWM mode with a controlled on-time selected by the proprietary control circuitry. The on-time is proportional to the difference between the regulated output voltage set point and the current output voltage, then the duty cycle of the switching MOSFET is adjusted until the specified output voltage is obtained. When in PWM mode, the device is protected against excessive output voltage, excessive load current, and over-temperature conditions. The device also includes an internal current limit feature which reduces the maximum allowed load current when the load current exceeds the set limit.

When starting up, the IC first ramps up the output voltage during the startup phase. During this phase, the device uses an internally-generated startup signal which overrides the external PWM signal. After the startup phase, the external PWM signal is used and the output voltage is regulated according to its setpoint. This allows the user to precisely control the output voltage with the external signal.

Advantages

The LM2588S-12 offers a wide variety of advantages compared to other step-up regulators. Its extended input voltage range, tight output voltage regulation, high efficiency, and low component count make it ideal for automotive, handheld devices, battery chargers, and other applications requiring a wide input voltage range. Furthermore, its internal current sense, thermal shutdown, and overvoltage protection features ensure a high level of safety and reliability. In addition, its fixed frequency operation and low noise output make it suitable for low noise applications such as hearing aids and noise-sensitive applications.

Conclusion

This article has discussed the LM2588S-12 application fields and working principle. This device is a high efficiency DC-DC step-up switching regulator designed for extended input voltage range and tight output voltage regulation. Its internal current sense and thermal shutdown features, as well as its low component count and high efficiency make it ideal for automotive, handheld devices, battery chargers, and other applications requiring a wide input voltage range. Furthermore, its fixed frequency operation and low noise output make it ideal for noise-sensitive applications.

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