ISL62391

Description: The ISL62391 controller generates supply voltage for battery-powered systems. It includes two pulse-width modulation (PWM) controllers, adjustable from 0.6V to 5.5V, and a linear regulator (LDO3) that generates a fixed 3.3V and can deliver up to 100mA. The ISL62391 includes on-board power-up sequencing, a power-good (PGOOD) output, digital soft-start, and internal soft-stop output discharge that prevents negative voltages on shutdown. The patented R3 PWM control scheme provides a low jitter system with fast response to load transients. Light-load efficiency is improved with period-stretching discontinuous conduction mode (DCM) operation. To eliminate noise in audio frequency applications, an ultrasonic DCM mode is included, which limits the minimum switching frequency to 28kHz. The ISL62391, ISL62391C, ISL62392, and ISL62392C are identical except for how their overvoltage protection is handled. The ISL62391 utilizes a tri-state overvoltage scheme, whereas the ISL62392 employs a soft-crowbar method.

The ISL62391 is a versatile power management controller designed specifically for battery-operated systems, enabling efficient voltage regulation and power sequencing. The controller's dual pulse-width modulation (PWM) controllers allow for a flexible output voltage range from 0.6V to 5.5V, catering to diverse application needs. The inclusion of a linear regulator (LDO3) that outputs a stable 3.3V with a current capacity of up to 100mA ensures adequate power supply for various components within the system.

The controller features advanced power management capabilities, including on-board power-up sequencing and a power-good output (PGOOD), which indicates the operational status of the power supply. Digital soft-start functionality is integrated to manage inrush current during startup, thereby protecting sensitive components from voltage spikes. Additionally, the internal soft-stop output discharge mechanism is critical for preventing negative voltage conditions during shutdown, enhancing system reliability.

The patented R3 PWM control scheme is a significant innovation that minimizes jitter in the output, ensuring a stable response to load transients. This characteristic is particularly important in applications where quick changes in load are expected, as it allows the system to maintain performance without compromising stability. The controller also incorporates a period-stretching discontinuous conduction mode (DCM) to improve efficiency under light-load conditions, which is essential for extending battery life in portable devices.

For applications sensitive to audio frequency noise, the ISL62391 offers an ultrasonic DCM mode, which restricts the minimum switching frequency to 28kHz. This feature is particularly beneficial in audio systems where noise can significantly impact performance.

The ISL62391 series, including the ISL62391C, ISL62392, and ISL62392C, shares a common architecture with variations in overvoltage protection mechanisms. The ISL62391 employs a tri-state overvoltage protection scheme, while the ISL62392 utilizes a soft-crowbar method, allowing designers to select a variant that best fits their application requirements. Overall, the ISL62391 controller integrates essential features for efficient power management, making it a suitable choice for a wide range of battery-powered applications.The ISL62391 controller generates supply voltage for battery-powered systems. It includes two pulse-width modulation (PWM) controllers, adjustable from 0. 6V to 5. 5V, and a linear regulator (LDO3) that generates a fixed 3. 3V and can deliver up to 100mA. The ISL62391 includes on-board power-up sequencing, a power-good (PGOOD) output, digital soft-st art, and internal soft-stop output discharge that prevents negative voltages on shutdown. The patented R3 PWM control scheme provides a low jitter system with fast response to load transients. Light-load efficiency is improved with period-stretching discontinuous conduction mode (DCM) operation.

To eliminate noise in audio frequency applications, an ultrasonic DCM mode is included, which limits the minimum switching frequency to 28kHz. The ISL62391, ISL62391C and ISL62392, ISL62392C are identical except for how their overvoltage protection is handled.

The ISL62391 utilizes a tri-state overvoltage scheme, whereas the ISL62392 employs a soft-crowbar method.