ISL65426HRZ-T

The ISL65426HRZ-T is a monolithic step-down switching regulator that is specifically designed for powering mobile devices and other cost-sensitive applications requiring high performance, excellent power efficiency, and robust features.

The ISL65426HRZ-T’s current-mode controllers allow it to rapidly transition between output voltages. The device can supply up to 2 A of continuous output current with a wide input operating range of 2.2 V to 6.5 V. Its high efficiency characteristic helps save battery life in mobile devices, consuming only <20 μA of quiescent current in no-load conditions.

The ISL65426HRZ-T offers a number of robust features to enable high performance and reliability:

• Adjustable output voltage from 0.8 V to 5.0 V with 0.5 % accuracy
• Built-in loop compensation to minimize external components
• Frequency jittering to reduce the EMI filter size
• Fixed frequency operation of 1 MHz
• Input surge protection at up to 10 V
• Output over-current protection
• Reverse-current protection

The ISL65426HRZ-T is well-suited for integration into mobile devices, providing a small, low-power solution. It is suitable for applications such as audio amplifiers, wireless communication circuitry, Bluetooth Low Energy (BLE) and analog baseband for voice or data transfer.

Working Principle

The ISL65426HRZ-T is a pulse-width modulation (PWM) DC to DC buck switching regulator integrated circuit. It takes an input voltage source, typically supplied by a battery, and regulates it to a precise output voltage. It operates by switching the input voltage on and off at a high frequency, providing a precise and efficient voltage regulation.

The ISL65426HRZ-T takes an unregulated DC input voltage source and steps it down to the desired output voltage by periodically turning on a MOSFET switch, which shorts the input voltage supply. The voltage is then discharged into an inductor, which stores the energy during the “on” interval. When the MOSFET switch is turned off, the stored energy is then discharged back into the output.

The output voltage is regulated by adjusting the “on” and “off” time of the MOSFET switch or “duty cycle,” ensuring that the output voltage does not vary. This voltage regulation method is known as pulse width modulation (PWM). The ISL65426HRZ-T also has additional features such as under-voltage lockout and programmable PWM frequency to customize the switching regulator to a specific output voltage and application.

In short, the ISL65426HRZ-T is a DC to DC switching regulator, which uses pulse-width modulation to convert an unregulated DC voltage to an accurate and precise output voltage.