LM2745

具有预偏置启动和可选时钟同步的 1-14V、电压模式同步降压控制器

The /8 are high-speed synchronous buck regulator controllers with an accurate feedback voltage accuracy of ±1.5%. It can provide simple down conversion to output voltages as low as 0.6V. Though the control sections of the IC are rated for 3 to 6V, the driver sections are designed to accept input supply rails as high as 14V. The use of adaptive non-overlapping MOSFET gate drivers helps avoid potential shoot-through problems while maintaining high efficiency. The IC is designed for the more cost-effective option of driving only N-channel MOSFETs in both the high-side and low-side positions. It senses the low-side switch voltage drop for providing a simple, adjustable current limit.

The LM2745/8 features a fixed-frequency voltage-mode PWM control architecture which is adjustable from 50 kHz to 1 MHz with one external resistor. In addition, the LM2745 also allows the switching frequency to be synchronized to an external clock signal over the range of 250 kHz to 1 MHz. This wide range of switching frequency gives the power supply designer the flexibility to make better tradeoffs between component size, cost and efficiency.

Features include the ability to startup with a pre-biased load on the output, soft-start, input undervoltage lockout UVLO and Power Good based on both undervoltage and overvoltage detection. In addition, the shutdown pin of the IC can be used for providing startup delay, and the soft-start pin can be used for implementing precise tracking, for the purpose of sequencing with respect to an external rail.

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Switching Frequency from 50 kHz to 1 MHz

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Switching Frequency Synchronize Range 250 kHz to 1 MHz LM2745 Only

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Startup with a Pre-biased Output Load

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Power Stage Input Voltage from 1V to 14V

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Control Stage Input Voltage from 3V to 6V

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Output Voltage Adjustable Down to 0.6V

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Power Good Flag and Shutdown

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Output Overvoltage and Undervoltage Detection

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±1.5% Feedback Voltage Accuracy Over Temperature

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Low-side Adjustable Current Sensing

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Adjustable Soft-start

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Tracking and Sequencing with Shutdown and Soft Start Pins

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TSSOP-14 Package

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