LM3404_14 Datasheet, PDF (1/39 Pages) Texas Instruments – 1.0A Constant Current Buck Regulator for Driving High Power LEDs

LM3404, LM3404HV
www.ti.com
SNVS465E – OCTOBER 2006 – REVISED FEBRUARY 2010
LM3404/04HV 1.0A Constant Current Buck Regulator for Driving High Power LEDs
Check for Samples: LM3404, LM3404HV
FEATURES
1
•2 Integrated 1.0A MOSFET
• V_IN Range 6V to 42V (LM3404)
• V_IN Range 6V to 75V (LM3404HV)
• 1.2A Output Current Over Temperature
• Cycle-by-Cycle Current Limit
• No Control Loop Compensation Required
• Separate PWM Dimming and Low Power
Shutdown
• Supports All-ceramic Output Capacitors and
Capacitor-less Outputs
• Thermal Shutdown Protection
• SOIC-8 Package, So PowerPAD-8 Package
DESCRIPTION
The LM3404/04HV are monolithic switching
regulators designed to deliver constant currents to
high power LEDs. Ideal for automotive, industrial, and
general lighting applications, they contain a high-side
N-channel MOSFET switch with a current limit of
1.5A (typical) for step-down (Buck) regulators.
Hysteretic controlled on-time and an external resistor
allow the converter output voltage to adjust as
needed to deliver a constant current to series and
series-parallel connected LED arrays of varying
number and type. LED dimming via pulse width
modulation (PWM), broken/open LED protection, low-
power shutdown and thermal shutdown complete the
feature set.
APPLICATIONS
• LED Driver
• Constant Current Source
• Automotive Lighting
• General Illumination
• Industrial Lighting
Typical Application
V_IN
C_IN
C_B
VIN
BOOT
SW
R_ON
RON
LM3404/04HV
CS
DIM
GND
VCC
L1
D1
I_F
R_SNS
C_F
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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