SNVS508D October 2007 – September 2016 LM3405A
PRODUCTION DATA.
PIN | I/O | DESCRIPTION | ||
---|---|---|---|---|
NAME | SOT | MSOP-PowerPAD | ||
BOOST | 1 | 4 | O | Boost voltage that drives the NMOS output switch. A bootstrap capacitor is connected between the BOOST and SW pins. |
GND | 2 | 2, 7 | — | Signal and power ground pin. Place the bottom resistor of the feedback network as close as possible to this pin. |
FB | 3 | 1 | I | Feedback pin. Connect FB to the LED string cathode and an external resistor to ground to set the LED current. |
EN/DIM | 4 | 8 | I | 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 VIN + 0.3 V. |
VIN | 5 | 6 | I | Input supply voltage. Connect a bypass capacitor locally from this pin to GND. |
SW | 6 | 5 | O | Switch pin. Connect this pin to the inductor, catch diode, and bootstrap capacitor. |
NC | — | 3 | — | No connection. |
DAP | N/A | — | — | Attach to power ground pin (GND). |