LTC3857EGN-1#PBF

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PMIC, or Power Management ICs, are devices used in electronics to regulate and monitor voltage. One type of PMIC is the DC-DC Switched Controller, which is used to regulate and switch DC power inputs, in order to step down or step up voltage levels as required. The LTC3857EGN-1#PBF, is a high-performance, dual-channel, monolithic DC-DC Switching Controller IC, designed for telecom and industrial power-supply systems.

Features of LTC3857EGN-1#PBF

• Integrated dual MOSFET drivers
• Dual, independent current-mode controllers
• ±1.5V to ±8V adjustable output voltage range
• Programmable switching frequency up to 3MHz
• Spread spectrum clocking support
• Adaptive dead-time control
• Independent PLL clock synchronization
• Load line protection
• Current sharing
• Open-drain pins

Applications of LTC3857EGN-1#PBF

The LTC3857EGN-1#PBF is suitable for a variety of telecom, industrial and other power-supply applications. It has been designed specifically for high-performance, multi output voltage DC-DC applications such as:

• Long-distance telecom power supplies
• High performance server power supplies
• Industrial process control
• Battery chargers
• High-current power converters
• Finding power sources

LTC3857EGN-1#PBF Working Principle

The LTC3857EGN-1#PBF controllers are current-mode, dual-channel DC-DC switching controllers. The LTC3857EGN-1#PBF combines two independent Output Voltage PLLs. Each of these PLLs is based on a synchronous, voltage-mode feedback circuit, and can have a different output voltage. The LTC3857EGN-1#PBF can be configured to deliver multiple outputs with different supply voltages and current limits.

The controller operates at the selected PWM frequency, which is adjustable or synchronized by an external clock. For each channel, the average output current is controlled by a current-sensing resistor. This current-sensing resistor is connected between the controller\'s DRVOUT pin and the source of the output MOSFET. The current at DRVOUT is also used to control MOSFET operation.

To ensure constant switching, the LTC3857EGN-1#PBF is equipped with both under-voltage and over-voltage protection. If a short-circuit current is detected on either of the channels, the output voltage will be shut down and a fault signal will be sent to the controller. The controller also supports an external clock for synchronization of the switching frequency.

Conclusion

The LTC3857EGN-1#PBF is a high-performance, dual-channel, monolithic DC-DC Switching Controller. It is designed for telecom and industrial power-supply applications, and is equipped with several features to ensure a reliable and efficient power supply, such as current sensing, load-line protection, and spread spectrum clocking support. The device’s current-mode architecture facilitates power management and improved power conversion efficiency, and its external clock synchronization helps to reduce switching noise.

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