ISL78226ANZ

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The ISL78226ANZ is an advanced switching regulator controller with a wide array of integrated features to simplify power management design. It has been designed to help eliminate external components, reduce design time and cost, and simplify EMI and thermal requirements. This device\'s highly integrated on-chip circuitry greatly reduces overall system cost and complexity.

The ISL78226ANZ can be used as a point-of-load regulator (POL) or as a buck-boost converter. It features built-in two-phase interleaving high-frequency PWM control, adjustable current limit, soft-start, power-good and power-save operation modes, integrated high-side and low-side driver, internal or external compensation, and programmable switching frequency. The ISL78226ANZ is designed to meet the requirements of a polymer tantalum, low ESR ceramic capacitors, and low RDSON output FET designs.

The ISL78226ANZ is available in a 20-lead, 2.96mmx2.22mm QFN package. The controller can operate with a wide input voltage range of 3V to 16V and provides a regulated output voltage range up to 5.25V. It also supports wide output voltage tolerances of +/-1.5% and load current tolerance of +/-0.1%. In addition, the device features 500kHz to 2.5MHz switching frequency and over-current protection (OCP) with programmable current limit settings.

The application field of the ISL78226ANZ includes processor core and FPGA supplies, POLs, application-specific POLs, step-down and step-up converters, automotive-grade switching buck converters, and more. The wide range of applications and advanced functionality of the ISL78226ANZ make it ideal for a variety of portable and distributed power systems, such as cellphones and automotive systems.

The ISL78226ANZ works on the principle of peak current mode control. The internal current sensing circuit monitor the current flowing through the switching MOSFET, and the device adjusts the switch output voltage to maintain peak current mode control rather than voltage mode control. The combination of current mode control and pulse width modulation (PWM) allows the ISL78226ANZ to achieve a high-level of accuracy in regulating both static and dynamic load currents.

The integrated features of the ISL78226ANZ provide additional flexibility in designs. The internal soft-start, adjustable current limit and power-save mode enable energy saving, while the power-good signal allow efficient diagnosis. In addition, the device’s low-ESR and high-speed output FETs, low-voltage output range and low load current tolerance help to reduce system cost. The ISL78226ANZ is an ideal choice for DC-DC conversions and power management applications, providing exceptional performance and reliability.

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