LM2650 - 同步降压 DC/DC 转换器

LM2650是TI德州仪器公司的一款转换器（集成开关）产品，LM2650是同步降压 DC/DC 转换器，本站介绍了LM2650的封装应用图解、特点和优点、功能等，并给出了与LM2650相关的TI元器件型号供参考。

LM2650 - 同步降压 DC/DC 转换器 - 转换器（集成开关） - DC/DC开关稳压器 - 德州仪器

产品描述

The LM2650 is a step-down DC/DC converter featuring high efficiency over a 3A to milliamperes load range. This feature makes the LM2650 an ideal fit in battery-powered applications that demand long battery life in both run and standby modes.

The LM2650 also features a logic-controlled shutdown mode in which it draws at most 25μA from the input power supply.

The LM2650 employs a fixed-frequency pulse-width modulation (PWM) and synchronous rectification to achieve very high efficiencies. In many applications, efficiencies reach 95%+ for loads around 1A and exceed 90% for moderate to heavy loads from 0.2A to 2A.

A low-power hysteretic or "sleep" mode keeps efficiencies high at light loads. The LM2650 enters and exits sleep mode automatically as the load crosses "sleep in" and "sleep out" thresholds. The LM2650 provides nodes for programming both thresholds via external resistors. A logic input allows the user to override the automatic sleep feature and keep the LM2650 in PWM mode regardless of the load level.

An optional soft-start feature limits current surges from the input power supply at start up and provides a simple means of sequencing multiple power supplies.

产品特性

Ultra High Efficiencies (95% possible)
High Efficiency Over a 3A to Milliamperes Load Range
Synchronous Switching of Internal NMOS Power FETs
Wide Input Voltage Range (4.5V to 18V)
Output Voltage Adjustable from 1.5V to 16V
Automatic Low-Power Sleep Mode
Logic-Controlled Micropower Shutdown (IQSD ≤ 25 µA)
Frequency Adjustable up to 300 kHz
Frequency Synchronization with External Signal
Programmable Soft-Start
Short-Circuit Current Limiting
Thermal Shutdown
Available in 24-lead Small-Outline Package

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