LM2748 - 具有预偏置启动的 1-14V、电压模式同步降压控制器

LM2748是TI德州仪器公司的一款控制器（外部开关）产品，LM2748是具有预偏置启动的 1-14V、电压模式同步降压控制器，本站介绍了LM2748的封装应用图解、特点和优点、功能等，并给出了与LM2748相关的TI元器件型号供参考。

LM2748 - 具有预偏置启动的 1-14V、电压模式同步降压控制器 - 控制器（外部开关） - DC/DC开关稳压器 - 德州仪器

产品描述

The LM2745/8 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.

产品特性

Switching Frequency from 50 kHz to 1 MHz
Switching Frequency Synchronize Range 250 kHz to 1 MHz (LM2745 Only)
Startup with a Pre-biased Output Load
Power Stage Input Voltage from 1V to 14V
Control Stage Input Voltage from 3V to 6V
Output Voltage Adjustable Down to 0.6V
Power Good Flag and Shutdown
Output Overvoltage and Undervoltage Detection
±1.5% Feedback Voltage Accuracy Over Temperature
Low-side Adjustable Current Sensing
Adjustable Soft-start
Tracking and Sequencing with Shutdown and Soft Start Pins
TSSOP-14 Package

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