1 Features

• Integrated Shielded Inductor

• Simple PCB Layout

• Frequency Synchronization Input (650 kHz to 950

kHz)

• Flexible Startup Sequencing Using External Soft-

start, Tracking and Precision Enable

• Protection Against Inrush Currents and Faults ANSuch

as Input UVLO and Output Short Circuit

• Junction Temperature Range –40°C to 125°C

• Single Exposed Pad and Standard Pinout for Easy

Mounting and Manufacturing

• Fast Transient Response for Powering FPGAs

and ASICs

• Fully Enabled for WEBENCH® Power Designer

• Pin Compatible With

LMZ22005/LMZ23605/LMZ22003

• Performance Benefits

– High Efficiency Reduces System Heat

Generation

– Tested to EN55022 Class B

– See AN-2125 (SNVA473) and layout for

information on device under test.

– V IN = 24 V, VO = 3.3 V, IO = 3 A

NOTE: EN 55022:2006, +A1:2007, FCC Part 15 Subpart B: 2007.

– Low component count, only 5 external

components

– Low output voltage ripple

– Uses PCB as heat sink, no airflow required

• Electrical Specifications

– 18-W maximum total output power

– Up to 3-A output current

– Input voltage range 6 V to 36 V

– Output voltage range 0.8 V to 6 V

– Efficiency up to 92%

2 Applications

• Point-of-load Conversions from 12-V and 24-V

Input Rail

• Time-Critical Projects

• Space Constrained and High Thermal

Requirement Applications

• Negative Output Voltage Applications (See ANSuch

2027, SNVA425)

3 Description

The LMZ23603 SIMPLE SWITCHER® power module

is an easy-to-use step-down DC-DC solution capable

of driving up to 3-A load. The LMZ23603 is available in an innovative package that enhances thermal

performance and allows for hand or machine

soldering.

The LMZ23603 can accept an input voltage rail

between 6 V and 36 V and deliver an adjustable and

highly accurate output voltage as low as 0.8 V. The

LMZ23603 only requires two external resistors and

three external capacitors to complete the power

solution. The LMZ23603 is a reliable and robust

design with the following protection features: thermal

shutdown, programmable input undervoltage lockout,

output overvoltage protection, short circuit protection,

output current limit, and allows start-up into a

prebiased output. The sync input allows

synchronization over the 650-kHz to 950-kHz

switching frequency range.