DC1238A: 5V @ 500mA, 36Vin Step Down Regulator

Summary

Demonstration circuit 1238A features the LTM®8021, a 36V 500mA step-down μModule® regulator. The output has been preset to 5V by a single resistor within the LTM8021’s output voltage range of 0.8V to 5V. An adjustable soft-start period may be implemented with the addition of a capacitor at C3.

The input voltage range is from 7.5V to 36V for the default operating conditions. The LTM8021 may need more input voltage to start up than to run in steady state.The data sheet gives a complete description of the part, operation and applications information.

The LTM8021 data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit DC1238A.

Specifications

Manufacturer Analog Devices Inc.
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Single Output
Eval Board Part Number 505-LTM8021EV#PBF-ND
Eval Board Supplier Analog Devices Inc.
Eval Board Normally In Stock
Topology Step Down
Outputs and Type 1 Non-Isolated
Voltage Out: Factory Set 5 V
Current Out 500 mA
Voltage In 7.5 ~ 36 V
Efficiency @ Conditions >85%, 12V in, 5V @ 100 ~ 500 mA
>80%, 24V in, 5V @ 130 ~ 500 mA
>70%, 36V in, 5V @ 80 ~ 100 mA
Voltage Out Range 0.8 ~ 5 V
Features Soft Start
Switching Frequency 1.1 MHz
Standby Current [Typical] 100 nA
Quiescent Current [Typical] 1.5 mA
Component Count + Extras 6 + 3
Internal Switch Yes
Design Author Linear Technology
Application / Target Market Automotive
Point of Load (PoL)
Portable Devices
Standby Current [Maximum] 1 µA
Quiescent Current [Maximum] 2.5 mA
Main I.C. Base Part LTM8021
Date Created By Author 2011-06
Date Added To Library 2012-05

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Support Documents & Media

DC1238A - User Guide LTM8021 - Datasheet

Media

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