S-817B21AMC-CWKT2U Integrated Circuits (ICs)

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The S-817B21AMC-CWKT2U is a low quiescent current and low dropout linear voltage regulator designed for space-constrained applications seeking high efficiency without compromising system performance. The device incorporates Constant voltage (CV) and Constant current (CC) outputs and also features line supervisory and control functions, offering reliable power management in a wide range of applications.

The device is built to provide high efficiency, robustness, fast start-up time, and low drop out voltage. It integrates a bypass pin that ensures high current handling capability in addition to the capability to run at low voltage and low quiescent current levels. It operates within the voltage range of 4.5V to 26V, enabling it to handle input signals from a wide range of sources, including USB-C and Wolfson. The current limit is set to 0.9A, enabling a stable and low quiescent current.

The S-817B21AMC-CWKT2U uses adaptive current source control in order to achieve constant voltage and current regulation. It utilizes a novel architecture that utilizes a synchronous voltage-mode controller, combined with a current sense technique, to monitor and regulate the output voltage and current. It features a wide input voltage range, providing high efficiency in both high and low input voltage conditions. The device is also capable of providing tight voltage and current accuracy and wide operating temperature range (-40°C to +85°C).

The S-817B21AMC-CWKT2U includes one low-side optimized voltage regulator and two high-side optimized voltage regulators that have different dropout voltages. The low-side optimized regulator enables a low output voltage gate and small voltage ripple. The high-side optimized regulator provides a high output gate voltage, enabling wide load current applications with small temperature differences. It also features output overvoltage protection, output short-circuit protection, and under-voltage protection.

The device also includes auto-fault protection and a power-good signal. The auto-fault protection protects the device from any malfunctions by limiting the output current and discharging the output capacitors automatically. The power-good signal alerts the system, via digital communication, when the voltage/current/temperature output of the device fails due to any malfunction. Additionally, it has a low operating temperature and a low standby current that reduces power consumption.

The device meets the harmonic emission requirement of EN55022, the Product Safety regulation and the Restriction of Hazardous Substances Standard (RoHS). It also features under-voltage lockout, which protects the device from output short circuit problems and prevents the output voltage from dropping below the specified voltage. Furthermore, it has an over-temperature protection, which adjusts the reference voltage in order to keep the device temperature within the specified limits.

In conclusion, the S-817B21AMC-CWKT2U is an innovative application with versatile operating range and protection features ideal for low dropout linear voltage regulation and low quiescent current operation. It is an excellent choice for high efficiency, highly Integrated Constant voltage and Constant current outputs, and reliable power management in space-constrained applications.

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