DC507A: 12mA @ 13V Max, 2.7 ~ 5V in, Boost

Summary

Demonstration circuit 507 features the LT1937 constant current white LED driver in a small SC70 package. The demo board consists of two circuits: an efficiency circuit designed to demonstrate high efficiency performance of the LT1937 using the Murata inductor and a size circuit highlighting the LT1937’s ability to work with a small ceramic chip inductor and a small output capacitor (0.22μF). The high efficiency and small circuit size are made possible by a 95 mV feedback voltage and 1.2 MHz switching frequency, making the LT1937-SC70 an ideal solution for battery powered portable applications such as cellular phones, digital cameras, MP3 players, GPS receivers, and handheld computers (PDAs).

The DC507 is specifically designed for white LED backlight applications using 2–4 LEDs in series. LT1937 offers numerous LED-dimming circuit options, see the datasheet for more detailed information on LED brightness control.

Specifications

Manufacturer Analog Devices Inc.
Category Lighting
Sub-Category LED Drivers - DC In
Eval Board Part Number DC507A-ND
Eval Board Supplier Analog Devices Inc.
Eval Board Normally In Stock
Voltage In 2.7 ~ 5 V
Topology Step Up
Current Out 12 mA
Voltage Out (Max) 13 V
Outputs and Type 1 Non-Isolated
Efficiency @ Conditions >82%, 3V in, 10 ~ 20 mA
>82%, 3.6V in, 10 ~ 20 mA
Features Current Limit (Adj. or Fixed)
Dimming Control
Open Circuit Protection
Shutdown, Enable, Standby
Switching Frequency 1.2 MHz
Component Count + Extras 17 + 14
Design Author Linear Technology
Application / Target Market Audio: MP3 Players
Cell Phones
Digital Cameras
GPS
Portable Devices
Tablets
Main I.C. Base Part LT1937
Date Created By Author 2009-03
Date Added To Library 2015-04

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