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LM3405A Datasheet(PDF) 2 Page - Texas Instruments |
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LM3405A Datasheet(HTML) 2 Page - Texas Instruments |
2 / 32 page 1 2 3 6 5 4 BOOST GND FB SW VIN EN/DIM 1 4 3 2 8 5 6 7 SW GND VIN EN/DIM BOOST GND FB NC LM3405A SNVS508C – OCTOBER 2007 – REVISED MAY 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. CONNECTION DIAGRAMS Figure 1. 6-Lead SOT Package Figure 2. 8-Lead VSSOP PowerPAD Package See Package Number DDC0006A See Package Number DGN0008A SOT-6 Pin Descriptions Pin No. Name Application Information Boost voltage that drives the NMOS output switch. A bootstrap capacitor is connected between the BOOST and 1 BOOST SW pins. 2 GND Signal and power ground pin. Place the bottom resistor of the feedback network as close as possible to this pin. 3 FB 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 4 EN/DIM duty cycle at different frequencies controls the brightness of LEDs. Do not allow this pin to float or be greater than VIN + 0.3V. 5 VIN Input supply voltage. Connect a bypass capacitor locally from this pin to GND. 6 SW Switch pin. Connect this pin to the inductor, catch diode, and bootstrap capacitor. VSSOP-8 PowerPAD Pin Descriptions Pin No. Name Function 1 FB Feedback pin. Connect FB to external resistor divider to set output voltage. 2, 7 GND 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. 3 NC No Connection 4 BOOST Boost voltage that drives the NMOS output switch. A bootstrap capacitor is connected between the BOOST and SW pins. 5 SW Switch pin. Connect this pin to the inductor, catch diode, and bootstrap capacitor. 6 VIN Input supply voltage. Connect a bypass capacitor locally from this pin to GND. 8 EN/DIM 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 + 0.3V. DAP Attach to power ground pin 2 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Product Folder Links: LM3405A |
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