LB1731-H-E

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Introduction

The LB1731-H-E is a power switch with load drivers for applications such as various electronic equipment products and digital home appliances. It can be used in AC adapter and other power distribution applications.

Features

• Very low on resistance with high current capacity.
• Input VDD: 3.3 V (typical).
• Outputs ground referenced; PWM driving.
• Low EMI radiation.
• Protects against overcurrent and over temperature.
• Thermal shutdown when junction temperature exceeds Tj(max).
• High quality EMC performance.

Application Fields

The LB1731-H-E integrates two high-side power FETs and two low-side power FETs, which can be used for various electronic devices that require constant current, such as personal computers, game consoles, LCD-TVs, notebook PCs, and digital home appliances.

Working Principle

The LB1731-H-E is mainly composed of two MOSFETs, one low-side and one high-side. The P-channel MOSFET is connected between the load and VDD, and serves as the high side switch. The N-channel MOSFET is connected between the load and ground and serves as the low side switch. Both of the switches can be controlled together by the controlling/monitoring IC.

The high-side power FET can be driven by an internal high-side driver, while the low-side power FET requires an external low-side driver to be driven. The high-side driver can provide a bidirectional ground referenced PWM signal which can be used to turn the high side switch on and off. The low-side FET can also be driven by an external PWM signal.

The LB1731-H-E provides overcurrent protection, over temperature protection and diagnostic functions, such as temperature and load current monitoring. It also features ESD protection and EMI radiation protection, as well as a thermally efficient low profile package.

Conclusion

The LB1731-H-E is an ideal power switch with load drivers, which can be used in various applications including AC adapter and digital home appliances. It has low resistance, high current capacity, ESD protection, EMI radiation protection, and other features. It is also compatible with external PWM signals, and thus can meet the requirements of different applications.

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