LM5111-1MX

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LM5111-1MX Application Field and Working Principle

The LM5111-1MX is a logic-level fence driver with peak currents up to 2.5 A. Separate input and output signals make it ideal for increasing the slew rate of digital power stages in a variety of switching power-conversion applications, providing the capability to increase switching speed while maintaining a faithful representation of the input logic signal. At the same time, this device can also provide fault protection features to control power MOSFETs. This performance of the LM5111-1MX can be attributed to its ability to operate from both 3.3 V and 5 V logic levels and feature an integrated charge-pump circuit, which increases the gate drive up to 12 V. In addition, the LM5111-1MX has a 350 ns typical propagation delay and provides very low standby power consumption.

Application Field

The LM5111-1MX is generally used in switching power stages of DC-DC converters in PC, telecom and consumer applications, due to its ability to provide fast switching speeds while maintaining the false logic input representation. It also can be used in low-side gate drive applications. Additionally, the LM5111-1MX provides a fault protection feature which is used to control power MOSFETs and prevent fault conditions by monitoring the logic signal.

Working Principle

The LM5111-1MX is an optimized and improved gate driver that performs both open-drain and totem-pole output operations. Its peak current is up to 2.5 A and has separate input and output signal for increasing the slew rate of digital power stages. The LM5111-1MX is designed in such a way that it can operate from both 3.3 V and 5 V logic levels, enabling greater flexibility for logic input signal configurations. The device also contains a charge pump circuit, which can increase the gate drive up to 12 V.

In addition to its ability to increase the slew rate of digital power stages, the LM5111-1MX also provides fault protection features. These features are used to monitor the logic signal direction, current level, and fault conditions. In case of a fault condition, an active low fault signal is generated and can be used to control power MOSFETs and prevent damage.

To sum up, the LM5111-1MX is a logic-level gate driver suitable for increasing the slew rate of digital power stages and providing fault protection in a variety of switching power-conversion applications. It is capable of operating from both 3.3 V and 5 V logic levels and features an integrated charge-pump circuit, which increases the gate drive up to 12 V. It also has a 350 ns typical propagation delay and very low standby power consumption.

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