LM3409, LM3409HV, LM3409-Q1
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SNVS602J –MARCH 2009–REVISED MAY 2013
PFET Buck Controller for High Power LED Drivers
Check for Samples: LM3409, LM3409HV, LM3409-Q1
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FEATURES
DESCRIPTION
The LM3409/09N/09HV/09Q/09QHV are P-channel
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LM3409Q/LM3409QHV is an Automotive Grade
Product That is AEC-Q100 Grade 1 Qualified
MosFET (PFET) controllers for step-down (buck)
current regulators. They offer wide input voltage
range, high-side differential current sense with low
adjustable threshold voltage and fast output
enable/disable function and a thermally enhanced
VSSOP-10 package. These features combine to
make the LM3409 family of devices ideal for use as
constant current sources for driving LEDs where
forward currents up to 5A are easily achievable.
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2Ω, 1A Peak MosFET Gate Drive
VIN Range: 6V to 42V
(LM3409/LM3409Q/LM3409N)
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VIN Range: 6V to 75V (LM3409HV/LM3409QHV)
Differential, High-side Current Sense
Cycle-by-Cycle Current Limit
No Control Loop Compensation Required
10,000:1 PWM Dimming Range
The LM3409 devices use 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
250:1 Analog Dimming Range
Supports All-Ceramic Output Capacitors and
Capacitor-less Outputs
with
excellent
achievable
contrast
ratios.
Programmable UVLO, low-power shutdown, and
thermal shutdown complete the feature set.
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Low Power Shutdown and Thermal Shutdown
Thermally Enhanced VSSOP-10 Package
Dual Inline Package (LM3409N)
The LM3409/09Q/09N have an operational input
voltage range up to 42V, while the LM3409HV/QHV
are high voltage options with an input voltage range
up to 75V. The LM3409/09HV/09Q/09QHV come in a
thermally enhanced 10-lead VSSOP package, while
the LM3409N comes in a 14-lead PDIP package. The
APPLICATIONS
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LED Driver
Constant Current Source
Automotive Lighting
General Illumination
LM3409Q/LM3409QHV
are
automotive
grade
products that are AEC-Q100 grade 1 qualified.
Typical Application
R
UV2
R
UV1
1
2
3
4
5
10
UVLO
IADJ
EN
VIN
VIN
C
F
C
IN
9
8
7
6
VCC
CSP
LM3409/HV
R
SNS
R
OFF
COFF
GND
CSN
C
OFF
DAP
PGATE
Q1
L1
VO
ILED
D1
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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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