LM3409QHV National Semiconductor, LM3409QHV Datasheet
LM3409QHV
Manufacturer Part Number
LM3409QHV
Description
PFET Buck Controller
Manufacturer
National Semiconductor
Datasheet
1.LM3409QHV.pdf
(30 pages)
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© 2010 National Semiconductor Corporation
PFET Buck Controller for High Power LED Drives
General Description
The LM3409/09HV are P-channel MosFET (PFET) con-
trollers for step-down (buck) current regulators. They offer
wide input voltage range, high-side differential current sense
with low adjustable threshold voltage, fast output enable/dis-
able function and a thermally enhanced eMSOP-10 package.
These features combine to make the LM3409/09HV ideal for
use as constant current sources for driving LEDs where for-
ward currents up to 5A are easily achievable. The
LM3409/09Q/09HV/09QHV uses Constant Off-Time (COFT)
control to regulate an accurate constant current without the
need for external control loop compensation. Analog and
PWM dimming are easy to implement and result in a highly
linear dimming range with excellent achievable contrast ra-
tios. Programmable UVLO, low-power shutdown, and thermal
shutdown complete the feature set.
Typical Application
300856
LM3409Q / LM3409QHV
LM3409 / LM3409HV
Features
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Applications
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LM3409Q/LM3409QHV is an Automotive Grade product
that is AEC-Q100 grade 1 qualified
2Ω, 1A Peak MosFET Gate Drive
V
V
Differential, High-side Current Sense
Cycle-by-Cycle Current Limit
No Control Loop Compensation Required
10,000:1 PWM Dimming Range
250:1 Analog Dimming Range
Supports All-Ceramic Output Capacitors and Capacitor-
less Outputs
Low Power Shutdown
Thermal Shutdown Protection
Thermally Enhanced eMSOP-10 Package
LED Driver
Constant Current Source
Automotive Lighting
General Illumination
Industrial Lighting
IN
IN
Range: 6V to 42V (LM3409/LM3409Q)
Range: 6V to 75V (LM3409HV/LM3409QHV)
30085601
April 12, 2010
www.national.com
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