8.1 Overview

The LMR23630-Q1 SIMPLE SWITCHER® regulator is an easy-to-use synchronous step-down DC/DC converter operating from 4-V to 36-V supply voltage. The device is capable of delivering up to 3-A DC load current with good thermal performance in a small solution size. For both SOIC and WSON packages, an extended family is available in multiple current options from 1-A to 3-A in pin-to-pin compatible packages.

The LMR23630-Q1 employs constant-frequency peak-current-mode control. The device enters PFM mode at light load to achieve high efficiency. A user-selectable FPWM option is provided to achieve low output voltage ripple, tight output voltage regulation, and constant switching frequency. The device is internally compensated, which reduces design time and requires few external components. The switching frequency is fixed 400 kHz. For the option which has an RT pin, the switching frequency is adjustable from 200 kHz to 2.2 MHz.  Also, the LMR23630-Q1 is capable of synchronization to an external clock within the range of 200 kHz to 2.2 MHz.

Additional features such as precision enable, power-good flag, and internal soft start provide a flexible and easy-to-use solution for a wide range of applications. Protection features include thermal shutdown, VIN and VCC undervoltage lockout, cycle-by-cycle current limit, and hiccup-mode short-circuit protection.

The family requires very few external components and has a pinout designed for simple, optimum PCB layout.