ISL69158IRAZ-T7A

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ISL69158IRAZ-T7A Application Field and Working Principle

The ISL69158IRAZ-T7A from Intersil Corporation is an integrated one-channel PoL dedicated 4A output step-down DC/DC regulator designed for backlight applications. This article focuses on the features, application field, and the working principle of this regulator.

Features

The ISL69158IRAZ-T7A is a highly integrated solution for applications including LCD panel backlight drivers. This regulator provides excellent current mode performance with a wide input voltage range from 2.5V to 24V. Its low supply current of 7μA (typical) makes the regulator suitable for battery operated systems.The ISL69158IRAZ-T7A provides 4A output current, a minimum output voltage of 0.7V, and a maximum output voltage of 20V. It also features short-circuit protection and over-temperature protection, while operating in an ambient temperature range from 0°C to 70°C.

Application Field

The ISL69158IRAZ-T7A is an ideal choice for backlight applications, such as LCD panel applications, LED matrix systems, and automotive backlights. Its high efficiency (up to 95 %) and high frequency ensures fast transient response time and low output ripple. This is especially important for LCD panel backlight applications, where the quality of the displayed images is highly dependent on the performance of the backlight regulator.

Working Principle

The ISL69158IRAZ-T7A utilizes current-mode control to regulate the output voltage. The regulator feedback and translinear circuits scan the output current and provide a stable output voltage regardless of the load conditions and transient loads.The regulator features a current pulse-width modulation (PWM) architecture which allows the current-mode control loop to respond quickly to load transients and provide excellent line and load regulation. This architecture also eliminates the need for an additional current control loop, thus reducing the width of the input signal, enabled by the low-self bias current of the internal comparators. The ISL69158IRAZ-T7A also features a high-speed, low-dropout linear post regulator to minimize the output voltage noise. The post regulator also acts as a switching linear regulator, allowing the switching frequency to be adjusted on-the-fly to minimize ripple and maintain an optimal output voltage over varying load conditions.

Conclusion

The ISL69158IRAZ-T7A from Intersil Corporation is an integrated one-channel PoL dedicated 4A output step-down DC/DC regulator designed for backlight applications. It is ideal for applications such as LCD panel backlight drivers, LED matrix systems, and automotive backlights. This regulator utilizes current-mode control and a current pulse-width modulation (PWM) architecture to provide a stable output voltage and excellent line and load regulation. It also features a high-speed, low-dropout linear post regulator to minimize the output voltage noise.

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