LM3409MY-NOPB Datasheet, PDF (1/43 Pages) Texas Instruments – PFET Buck Controller for High Power LED Drivers

LM3409, LM3409HV, LM3409-Q1
www.ti.com
SNVS602J – MARCH 2009 – REVISED MAY 2013
PFET Buck Controller for High Power LED Drivers
Check for Samples: LM3409, LM3409HV, LM3409-Q1
FEATURES
1
•2 LM3409Q/LM3409QHV is an Automotive Grade
Product That is AEC-Q100 Grade 1 Qualified
• 2Ω, 1A Peak MosFET Gate Drive
• V_IN Range: 6V to 42V
(LM3409/LM3409Q/LM3409N)
• V_IN 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
• 250:1 Analog Dimming Range
• Supports All-Ceramic Output Capacitors and
Capacitor-less Outputs
• Low Power Shutdown and Thermal Shutdown
• Thermally Enhanced VSSOP-10 Package
• Dual Inline Package (LM3409N)
APPLICATIONS
• LED Driver
• Constant Current Source
• Automotive Lighting
• General Illumination
DESCRIPTION
The LM3409/09N/09HV/09Q/09QHV are P-channel
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.
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
with excellent achievable contrast ratios.
Programmable UVLO, low-power shutdown, and
thermal shutdown complete the feature set.
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
LM3409Q/LM3409QHV are automotive grade
products that are AEC-Q100 grade 1 qualified.
Typical Application
R_UV2
R_UV1
1
UVLO
2
IADJ
10
VIN
C_F
9
VCC
V_IN
C_IN
R_OFF
C_OFF
3
EN
LM3409/HV
8
CSP
4
COFF
5
GND
DAP
7
CSN
6
PGATE
R_SNS
Q1
L1
D1
V_O
I_LED
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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