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National Semiconductor Electronic Components Datasheet

LM3404 Datasheet

1.0A Constant Current Buck Regulator

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LM3404 pdf
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ADVANCE INFORMATION
October 2006
LM3404/04HV
1.0A Constant Current Buck Regulator for Driving High
Power LEDs
General Description
The LM3404/04HV are monolithic switching regulators de-
signed to deliver constant currents to high power LEDs. Ideal
for automotive, industrial, and general lighting applications,
they contain a high-side NFET switch with a minimum over-
temperature current limit of 1.2A for step-down (Buck) regu-
lators. Hysteretic control with controlled on-time coupled with
an external resistor allow the converter output voltage to
adjust as needed to deliver constant current to series and
series-parallel connected LED arrays of varying number and
type. Output current dimming via PWM, broken/open LED
protection, low-power shutdown and thermal shutdown com-
plete the feature set.
Features
n Integrated 1.2A NFET
n VIN Range 6V to 42V (LM3404)
n VIN Range 6V to 75V (LM3404HV)
n 1.2A Output Current Over Temperature
n Cycle-by-Cycle Current Limit
n No Control Loop Compensation Required
n Separate PWM Dimming and Low Power Shutdown
n Supports all-ceramic output capacitors and
capacitor-less outputs
n Thermal shutdown protection
n SO-8 Package
Applications
n LED Driver
n Constant Current Source
n Automotive Lighting
n General Illumination
n Industrial Lighting
Typical Application
Connection Diagram
20205401
20205402
8-Lead Plastic SO-8 Package
NS Package Number M08A
© 2006 National Semiconductor Corporation DS202054
www.national.com


National Semiconductor Electronic Components Datasheet

LM3404 Datasheet

1.0A Constant Current Buck Regulator

No Preview Available !

LM3404 pdf
Physical Dimensions inches (millimeters) unless otherwise noted
SO-8 Package
NS Package Number M08A
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform when
properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to result
in a significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
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National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C2) and Banned Substances
and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at:
www.national.com/quality/green.
Lead free products are RoHS compliant.
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Support Center
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Part Number LM3404
Description 1.0A Constant Current Buck Regulator
Maker National Semiconductor
Total Page 2 Pages
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