LM3405XMK/NOPB National Semiconductor, LM3405XMK/NOPB Datasheet - Page 2

• Manufacturer Part Number: LM3405XMK/NOPB
• Description: IC LED DRVR HP CONST CURR TSOT-6
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: High Power, Constant Currentr

Specifications of LM3405XMK/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 ~ 15 V
• Mounting Type: Surface Mount
• Package / Case: TSOT-23-6, TSOT-6
• Operating Temperature: -40°C ~ 125°C
• Current - Output / Channel: 1A
• Internal Switch(s): Yes
• Efficiency: 92%
• For Use With: LM3405XEVAL - BOARD EVALUATION LM3405X
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Other names: LM3405XMKTR

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LM3405XMKX
Part Number
LM3405XMK
Connection Diagrams
Ordering Information
*NOPB versions are available
Pin Descriptions
Pin(s)
1
2
3
4
5
6
NS Package Number MK06A
Package Type
TSOT-6
BOOST
EN/DIM
Name
GND
6-Lead TSOT
SW
V
FB
IN
NS Package Drawing
Application Information
Voltage at this pin drives the internal NMOS power switch. A bootstrap capacitor is
connected between the BOOST and SW pins.
Signal and Power ground pin. Place the LED current-setting resistor as close as possible
to this pin for accurate current regulation.
Feedback pin. Connect an external resistor from FB to GND to set the LED Current.
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.
20178905
MK06A
2
Package Marking
SPNB
SPNB
Pin 1 Identification
IN
+ 0.3V.
1000 Units on Tape and Reel
3000 Units on Tape and Reel
20178960
Supplied As