LM3409 Datasheet, PDF (1/45 Pages) National Semiconductor (TI) – PFET Buck Controller for High Power LED Drives

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LM3409, LM3409-Q1, LM3409HV, LM3409HV-Q1
SNVS602L – MARCH 2009 – REVISED JUNE 2016
LM3409, -Q1, LM3409HV, -Q1 P-FET Buck Controller for High-Power LED Drivers
1 Features
•1 LM3409-Q1 and LM3409HV-Q1 are Automotive
Grade Products: AEC-Q100 Grade 1 Qualified
• 2-Ω, 1-A Peak MOSFET Gate Drive
• V_IN Range: 6 V to 42 V (LM3409, LM3409-Q1)
• V_IN Range: 6 V to 75 V (LM3409HV, LM3409HV-
Q1)
• 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 10-Pin, HVSSOP Package
2 Applications
• LED Driver
• Constant Current Source
• Automotive Lighting
• General Illumination
3 Description
The LM3409, LM3409-Q1, LM3409HV, and
LM3409HV-Q1 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 10-pin, HVSSOP
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 5 A 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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM3409
HVSSOP (10)
PDIP (14)
3.00 mm × 3.00 mm
19.177 mm × 6.35 mm
LM3409-Q1
LM3409HV
HVSSOP (10)
3.00 mm × 3.00 mm
LM3409HV-Q1
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Schematic
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
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.