ICL7662CPA+

Integrated Circuits Limited, or ICL, is a leading manufacturer of integrated circuits and systems, particularly in the area of regulated power supplies. ICL’s ICL7662CPA+ is a switch mode voltage regulator IC, aimed at providing efficient and cost-effective voltage regulation for DC/DC power conversion applications. This article will outline the typical application fields and internal working principle of the ICL7662CPA+.

Application Field

The ICL7662CPA+ is a highly efficient, small form factor switch mode voltage regulator, ideal for use in synchronous rectified buck topology, employing either discrete components or an external MOSFET. It is suitable for a variety of different voltage conversions, as well as providing load-dependant output voltage control (LDO). Due to its low power consumption and wide input voltage range, it is well suited to portable applications such as laptop computers, medical equipment and automotive applications.

The device is designed to work over a wide temperature range (-40°C to 125°C), making it suitable for use in high-temperature environments. It also comes with various protection features, including short circuit protection (SCR), over temperature protection (OTP) and overvoltage protection (OVP). This makes it ideal for use in applications where safety is a primary concern.

Given its wide operating temperature range, the ICL7662CPA+ is well suited for use in automotive and aerospace applications, where small size and high efficiency is required. It can also be used to replace discrete components in many other application scenarios, where its low solution cost and low external component requirements make it an ideal choice.

Working Principle

The ICL7662CPA+ utilizes a switch mode voltage regulator topology, to provide efficient and reliable voltage regulation over a wide input voltage range. In order to achieve this, the device employs an internal voltage reference, internal error amplifier, as well as power switching and control circuitry. In addition, it also contains a built-in pulse-width modulation (PWM) comparator and a high-current MOSFET output driver.

The device operates by regulating the output voltage to a pre-defined value, as set by the internal voltage reference. The internal error amplifier compares the setpoint voltage to the actual output voltage, and generates a voltage error signal which is used to adjust the duty cycle of the internal MOSFET driver, such that the output voltage is equal to the setpoint. The diode bridge in the power supply section of the circuit prevents inrush current from flowing into the system. This ensures that the connected loads are powered up safely and quickly.

As the name implies, the ICL7662CPA+ is capable of providing switching frequency up to 500kHz, allowing it to achieve high efficiency over the wide input voltage range. The internal compensation loop of the PWM comparator is designed to provide fast transient response, while the output voltage is regulated for improved accuracy and stability. In addition, the ICL7662CPA+ also has very low quiescent current, which results in improved efficiency.

Conclusion

The ICL7662CPA+ is a highly efficient switch mode voltage regulator, ideal for use in synchronous rectified buck topologies. It is well suited to portable applications, automotive and aerospace applications, and can be used to replace discrete components in many other applications. The device utilizes switching frequency up to 500kHz, providing high efficiency over a wide input voltage range. Internal features such as the voltage reference, error amplifier, power switching, PWM comparator and MOSFET driver, provide high accuracy and stability, while the built-in protections ensure safety when using the device.