LM3409HVMYX National Semiconductor, LM3409HVMYX Datasheet - Page 2

• Manufacturer Part Number: LM3409HVMYX
• Description: LM3409 LM3409HV PFET Buck Controller for High Power LED Drives; Package: MINI SOIC EXP PAD; No of Pins: 10; Qty per Container: 3500/Reel
• Manufacturer: National Semiconductor

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Connection Diagram
Ordering Information
Pin Descriptions
LM3409HVMYX
Order Number
Pin(s)
LM3409HVMY
LM3409MYX
DAP
LM3409MY
10
1
2
3
4
5
6
7
8
9
PGATE
Name
UVLO
COFF
IADJ
GND
CSN
CSP
VCC
DAP
VIN
EN
NSC Package Drawing
Thermal pad on bottom of IC
Input under-voltage lockout
Analog LED current adjust
Negative current sense
Off-time programming
Positive current sense
linear regulator output
MUC10A
MUC10A
MUC10A
MUC10A
Logic level enable /
V
PWM dimming
Input voltage
Description
IN
Gate drive
- referenced
Ground
10-Lead Exposed Pad eMSOP Package
LM3409/09HV
Application Information
Connect to a resistor divider from V
1.24V and hysteresis for turn-off is provided by a 22µA current source.
Apply a voltage between 0 - 1.24V, connect a resistor to GND, or leave
open to set the current sense threshold voltage.
Apply a voltage >1.74V to enable device, a PWM signal to dim, or a
voltage <0.5V for low power shutdown.
Connect a resistor from V
time.
Connect to the system ground.
Connect to the gate of the external PFET.
Connect to the negative side of the sense resistor.
Connect to the positive side of the sense resistor (also connected to
VIN).
Connect at least a 1µF ceramic capacitor to V
power for the PFET drive.
Connect to the input voltage.
Connect to pin 5 (GND). Place 4-6 vias from DAP to bottom layer GND
plane.
Top Marking
2
SYHB
SYHB
SXFB
SXFB
30085602
O
, and a capacitor from GND to set the off-
IN
and GND. Turn-on threshold is
1000 Units on tape and reel
3500 Units on tape and reel
1000 Units on tape and reel
3500 Units on tape and reel
IN
Supplied As
. The regulator provides