LMR54410数据手册集成电路（IC）的稳压器-DC-DC开关稳压器规格书PDF

描述 Description

The LMR544xx is a wide-VIN, easy-to-use synchronous buck converter capable of driving up to 1-A and 0.6-A load current. With a wide input range of 4 V to 36 V, the device is suitable for a wide range of industrial applications for power conditioning from an unregulated source.

The LMR544xx operates at 1.1-MHz switching frequency to support use of relatively small inductors for an optimized solution size. It has a PFM version to realize high efficiency at light load and a FPWM version to achieve constant frequency and small output voltage ripple over the full load range. Soft-start and compensation circuits are implemented internally, which allow the device to be used with minimal external components.

The device has built-in protection features, such as cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal shutdown in case of excessive power dissipation.

特性 Features

• Functional Safety-Capable
• Documentation available to aid functional safety system design

• Configured for rugged industrial applications
• 4-V to 36-V input voltage range
• 0.6-A/1-A continuous output current
• 60-ns minimum switching on time
• 1.1-MHz fixed switching frequency
• –40°C to 150°C junction temperature range
• 98% maximum duty cycle
• Monotonic start-up with pre-biased output
• Short circuit protection with hiccup mode
• Precision enable
• ±1% tolerance voltage reference

• Small solution size and ease of use
• Integrated synchronous rectification
• Internal compensation for ease of use
• SOT-23 package

• Pin-to-pin compatible with the LMR14010A, LMR50410, and TPS560430
• Various options in pin-to-pin compatible package
• PFM and forced PWM (FPWM) options