1 Features

• Functional Safety-Capable

– Documentation available to aid functional safety

system design

• Configured for rugged industrial applications

– 4-V to 65-V input voltage range

– Input transient protection up to 70-V

– 0.6-A/1-A continuous output current

– 80-ns minimum switching on time

– Fixed 400-kHz and 1.1-MHz 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

– ±1.5 tolerance voltage reference

• Small design size and ease of use

– Integrated synchronous rectification

– Internal compensation for ease of use

– SOT-23 package

• Various options in pin-to-pin compatible package

– PFM and forced PWM (FPWM) options

• Pin-to-pin compatible with the LMR16006,

LV2862, LMR50410, TPS560430, LMR54406, and

LMR54410

• Create a custom design using the LMR516xx with

the WEBENCH® Power Designer

2 Applications

• Major appliances

• PLC, DCS, and PAC

• Smart meters

• Power delivery

3 Description

The LMR516xx is a wide-VIN, easy-to-use

synchronous buck converter capable of driving up to

0.6-A and 1-A load current. With a wide input range of

4 V to 65 V, the device is designed for a wide range of

industrial applications for power conditioning from an

unregulated source.

The LMR516xx operates at 400-kHz and 1.1-MHz

switching frequency to support use of relatively

small inductors for an optimized design size. The

LMR516xx 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.