1 Features

• Functional Safety-Capable

– Documentation available to aid functional safety

system design

• Configured for rugged industrial applications

– Input voltage range: 3.8 V to 36 V

– Output voltage range: 1 V to 24 V

– Peak-current mode control

– Junction temperature range: –40°C to +125°C

– Ease-of-use SOIC package

• Well-suited for scalable industrial power supplies

– Pin compatible with:

• LMR33610, LMR33620, and LMR33630 (36

V, 1 A, 2 A, or 3 A)

• LMR36510 and LMR36520

(65 V, 1 A, or 2 A)

– 400-kHz and 1-MHz frequency

– Integrated compensation helps reduce solution

size, cost, and design complexity

• High-efficiency solution

– Peak efficiency > 95%

– Low shutdown quiescent current of 5 μA

– Low operating quiescent current of 24 μA

• Flexible system interface

– Power-good flag and precision enable

• Create a custom design using the LMR33640 with

the WEBENCH® Power Designer

• Use TPSM53604 module for faster time to market

2 Applications

• Motor drive systems: drones, AC inverters,

VF drives, servos

• Factory and building automation systems:

PLC, HMI, HVAC systems, elevator main control

panel

• Wide VIN DC/DC power supply

3 Description

The LMR33640 SIMPLE SWITCHER® regulator is

an easy-to-use, synchronous, step-down DC/DC

converter that delivers best-in-class efficiency for

rugged industrial applications. The LMR33640 drives

up to 4 A of load current from an input of up

to 36 V. The LMR33640 provides high light-load

efficiency and output accuracy. Features such as a

power-good flag and precision enable provide both

flexible and easy-to-use solutions for a wide range

of applications. The LMR33640 automatically folds

back frequency at light load to improve efficiency.

Protection features include thermal shutdown, input

undervoltage lockout, cycle-by-cycle current limit, and

hiccup short-circuit protection. Integration and internal

compensation eliminates many external components

and provides a pinout designed for a simple PCB

layout. The feature set of the device is designed

to simplify implementation for a wide range of end

equipment. The LMR33640 is pin-to-pin compatible

with the LMR33610, LMR33620, LMR33630 (36 V, 1

A/2, A/3 A), LMR36510 (65 V, 1 A), and LMR36520

(65 V, 2 A), completing the family of scalable SIMPLE

SWITCHER power supplies. This minimizes the cost

and effort associated with board layout modifications.

The LMR33640 is available in an 8-pin HSOIC

package.