1 Features

• 4-V to 36-V input range

• 2.5-A continuous output current

• Integrated synchronous rectification

• Current mode control

• Minimum switch ON time: 60 ns

• 2.1-MHz switching frequency with PFM and

forced-PWM-mode options (HSOIC)

• 2.1-MHz switching frequency with forced-PWM

mode only (WSON)

• Frequency synchronization to external clock

• Internal compensation for ease of use

• 75-μA quiescent current at no load

• Soft start into a prebiased load

• High duty-cycle operation supported

• Precision enable input

• Output short-circuit protection with hiccup mode

• Thermal protection

• 8-Pin HSOIC with PowerPAD™ package

• 12-Pin WSON wettable flanks package with

PowerPAD™

• Use the LMZM33603 module for faster time to

market

• Create a custom design using the LMR23625 with

the WEBENCH® Power Designer

2 Applications

• Factory and building automation systems: PLC

CPU, HVAC control, elevator control

• GSM, GPRS modules for fleet management, smart

grids, and security

• General purpose wide VIN regulation

3 Description

The LMR23625 SIMPLE SWITCHER® is an easy-touse

36-V, 2.5-A synchronous step-down regulator.

With a wide input range from 4 V to 36 V, the

device is suitable for various industrial application

for power conditioning from unregulated sources.

Peak current-mode control is employed to achieve

simple control-loop compensation and cycle-by-cycle

current limiting. A quiescent current of 75 μA makes

it suitable for battery-powered systems. An ultra-low

2 μA shutdown current can further prolong battery

life. Internal loop compensation means that the user

is free from the tedious task of loop compensation

design. This also minimizes the external components.

The device has an option for fixed-frequency FPWM

mode to achieve small output-voltage ripple at light

load. An extended family for HSOIC is available in

1-A (LMR23610) and 3-A (LMR23630) load current

options in pin-to-pin compatible packages which

allows simple, optimum PCB layout. A precision

enable input allows simplification of regulator control

and system power sequencing. Protection features

include cycle-by-cycle current limit, hiccup-mode

short-circuit protection and thermal shutdown due to

excessive power dissipation.