S-8356K33MC-NEST2U

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The S-8356K33MC-NEST2U is a DC/DC switching controller suitable for multiple applications.
This device is designed to increase power efficiency and reduce standby power consumption, and when utilized in systems such as notebook PCs, it can provide a RAM Retention mode to reduce system power consumption. It is a highly integrated device, including MPU CPU (MX1), On-Chip RAM, DRAM Current sense circuit, LDO, and Internal Soft Start circuit.

Introduction

The S-8356K33MC-NEST2U is small, low operating power continuous conduction mode (CCM) PWM DC/DC switching controller. It includes advanced system power management features such as buck-boost auto detection, RAM Retention mode, and improved light load efficiency. It is suitable for various DC/DC applications such as notebook PCs, telecom power supplies, and consumer electronics.

Features

The S-8356K33MC-NEST2U features include the following:

• Buck-Boost Auto detection function
• RAM Retention operation mode
• High Efficient current sense circuit
• Low power operation mode
• Internal Soft Start Circuit
• MPF+KVM compatible power management interface.

Application Field

The S-8356K33MC-NEST2U is used in a wide range of applications, such as:

• Notebook PCs
• Tablet PCs
• Networking Equipment
• Telecom Power Supplies
• Solar Inverters
• Home Appliances
• Consumer Electronics
• AV Equipment

Working Principle

The S-8356K33MC-NEST2U device contains a high-performance Buck-Boost auto detection circuit. When the device is set for Buck-Boost operation, the auto detection circuit periodically measures the input voltage and selects the operating mode. When the device enters RAM retention mode, the system power is reduced. The LDO provides power to the device while the RAM retention mode is active, allowing the system to perform RAM retention tasks without consuming additional system power.

The device uses a continuous conduction mode (CCM) to increase the efficiency in the mid- to light-load range by reducing the switching on time of the switching controller. This mode also reduces EMI generation.

The device has a built-in current sense circuit. This circuit measures the current of the internal MOSFET and the output voltage of the feedback loop, and provides PGA gain for the voltage error amplifier. This minimize the DC gain of the system, increasing the stability of the feedback loop.

The device also has an internal soft start circuit. This circuit can reduce the starting current and output capacitor ripple during startup. The soft start circuit can also reduce the time for any load dump during startup, improving system stability. Additionally, the device has an MPF+KVM power management bus that is compatible with many system-level power management protocols.

Conclusion

The S-8356K33MC-NEST2U is a PWM DC/DC switching controller suitable for various DC/DC applications such as notebook PCs, telecom power supplies, and consumer electronics. Its features include buck-boost auto detection, RAM retention mode, and improved light load efficiency. It is a highly integrated device, including MPU CPU (MX1), On-Chip RAM, DRAM Current sense circuit, LDO, and Internal Soft Start circuit.

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