LM3405AXMY/NOPB National Semiconductor, LM3405AXMY/NOPB Datasheet - Page 2

• Manufacturer Part Number: LM3405AXMY/NOPB
• Description: IC LED DRVR HP CONST CURR 8-MSOP
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: High Power, Constant Currentr

Specifications of LM3405AXMY/NOPB

• Constant Current: Yes
• Topology: PWM, Step-Down (Buck)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Flash/Torch
• Type - Secondary: High Brightness LED (HBLED), White LED
• Frequency: 1.2MHz ~ 1.9MHz
• Voltage - Supply: 3 V ~ 22 V
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP Exposed Pad, 8-HMSOP, 8-eMSOP
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 1A
• Internal Switch(s): Yes
• Efficiency: 92%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Other names: LM3405AXMYTR

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LM3405AXMKX
LM3405AXMYX
LM3405AXMK
LM3405AXMY
Part Number
Connection Diagrams
Ordering Information
SOT23-6 Pin Descriptions
eMSOP8 Pin Descriptions
Pin(s)
DAP
2, 7
Pin
1
2
3
4
5
6
1
3
4
5
6
8
NS Package Number MK06A
Package Type
6-Lead SOT-23 Package
eMSOP8
eMSOP8
TSOT-6
TSOT-6
BOOST
EN/DIM
BOOST
EN/DIM
Name
Name
GND
GND
VIN
SW
SW
VIN
NC
FB
FB
NS Package Drawing
Application Information
Boost voltage that drives the NMOS output switch. A bootstrap capacitor is connected
between the BOOST and SW pins.
Signal and power ground pin. Place the bottom resistor of the feedback network as close
as possible to this pin.
Feedback pin. Connect FB to external resistor divider to set output voltage.
Enable control input. Logic high enables operation. Toggling this pin with a periodic logic
square wave of varying duty cycle at different frequencies controls the brightness of LEDs.
Do not allow this pin to float or be greater than V
Input supply voltage. Connect a bypass capacitor locally from this pin to GND.
Switch pin. Connect this pin to the inductor, catch diode, and bootstrap capacitor.
Function
Feedback pin. Connect FB to external resistor divider to set output voltage.
Signal and power ground pin. Place the bottom resistor of the feedback network as close
as possible to this pin. Tie pins 2, 7 and DAP to one GND plane.
No Connection
Boost voltage that drives the NMOS output switch. A bootstrap capacitor is connected
between the BOOST and SW pins.
Switch pin. Connect this pin to the inductor, catch diode, and bootstrap capacitor.
Input supply voltage. Connect a bypass capacitor locally from this pin to GND.
Enable control input. Logic high enables operation. Toggling this pin with a periodic logic
square wave of varying duty cycle at different frequencies controls the brightness of LEDs.
Do not allow this pin to float or be greater than V
Attach to power ground pin
30015205
MUY08A
MUY08A
MK06A
MK06A
2
Package Marking
SSEB
SSEB
SVSA
SVSA
NS Package Number MUY08A
8-Lead eMSOP Package
IN
IN
+ 0.3V.
+ 0.3V.
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3500 Units on Tape and Reel
Supplied As
30015260