LM3432BSQX

• V _operates from 3V to 22V
• Drive up to 5 high brightness series LEDs at 1A
• The thin SOT23-6 package and eMSOP8 expose diammonium phosphate
• 1.6MHz switching frequency
• EN/DIM input enables and PWM dimming LEDs
• 300mΩNMOS switch
• The shutdown current of 40nA is at _V IN = 5V
• Internally compensated current-mode control
• Cycle-by-cycle current limit
• Input voltage UVLO
• Overcurrent protection
• Thermal shutdown

Description

The LM3405A is a 1A constant current buck LED driver designed to provide a simple, high efficiency solution for driving high power LEDs. A 0.205V reference voltage feedback control minimizes power dissipation, and an external resistor sets the current to drive the LED needs. The switching frequency is internally set to 1.6MHz, allowing the use of small surface mount inductors and capacitors. The LM3405A uses current mode control and internal compensation to provide easy-to-use and predictable, high-performance regulation over a wide range of operating conditions. With a maximum input voltage of 22V, it can drive up to 5 high-brightness series LEDs with a forward current of 1A, and copying, LED forward voltage of about 3.7V. Other features include user-accessible EN/DIM pins with LED with PWM dimming enabled and PWM dimming, thermal shutdown, cycle-by-cycle current limiting, and overcurrent protection.

Application

• LED driver
• Constant current source
• Industrial lighting
• LED flashlight
• LED bulbs