LM3406_09 Datasheet, PDF (2/26 Pages) National Semiconductor (TI) – 1.5A Constant Current Buck Regulator for Driving High Power LEDs

Connection Diagram
LM3406/06HV
30020302
14-Lead Exposed Pad Plastic TSSOP Package
NS Package Number MXA14A
Ordering Information
Order Number
LM3406MH
LM3406MHX
LM3406HVMH
LM3406HVMHX
Package Type
eTSSOP-14
Pin Descriptions
NSC Package Drawing
MXA14A
Supplied As
95 units in anti-static rails
2500 units on tape and reel
95 units in anti-static rails
2500 units on tape and reel
Pin(s)
1,2
3
4
5
6
7
8
9
10
11
12
13,14
DAP
Name
SW
BOOT
NC
VOUT
CS
GND
DIM
COMP
RON
VCC
VINS
VIN
DAP
Description
Switch pin
MOSFET drive bootstrap pin
No Connect
Output voltage sense pin
Current sense feedback pin
Ground pin
Input for PWM dimming
Error amplifier output
On-time control pin
Output of the internal 7V linear
regulator
Input voltage PWM dimming
comparator input
Input voltage pin
Thermal Pad
Application Information
Connect these pins to the output inductor and Schottky diode.
Connect a 22 nF ceramic capacitor from this pin to the SW pins.
No internal connection. Leave this pin unconnected.
Connect this pin to the output node where the inductor and the first
LED's anode connect.
Set the current through the LED array by connecting a resistor from
this pin to ground.
Connect this pin to system ground.
Connect a logic-level PWM signal to this pin to enable/disable the
power MOSFET and reduce the average light output of the LED array.
Logic high = output on, logic low - output off.
Connect a 0.1 µF ceramic capacitor with X5R or X7R dielectric from
this pin to ground.
A resistor connected from this pin to VIN sets the regulator controlled
on-time.
Bypass this pin to ground with a minimum 0.1 µF ceramic capacitor
with X5R or X7R dielectric.
Connect this pin to the anode of the input diode to allow dimming by
PWM of the input voltage
Nominal operating input range for this pin is 6V to 42V (LM3406) or 6V
to 75V (LM3406HV).
Connect to ground. Place 4-6 vias from DAP to bottom layer ground
plane.
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