Texas Instruments LM3405
The LM3405 is a 1-A constant current buck LED driver designed to provide a simple, high efficiency solution for driving high power LEDs. With a 0.205-V reference voltage feedback control to minimize power dissipation, an external resistor sets the current as required for driving various types of LEDs. The LM3405 uses current-mode control and internal compensation offering ease of use and predictable, high performance regulation over a wide range of operating conditions.| Part No. | LM3405 |
|---|---|
| Datasheet | LM3405 Download |
| Manufacturer |  Texas Instruments |
| Description | 1.6-MHz 1-A Constant Current Buck LED Driver |
| Buy | Stock & Price |
FEATURES
●1 VIN Operating Range of 3 V to 15 V● Drives up to 5 High-Brightness LEDs in Series at 1A
● Thin SOT-6 Package
● 1.6-MHz Switching Frequency
● EN/DIM Input for Enabling and PWM Dimming of LEDs
● 300-mΩ NMOS Switch
● 40-nA Shutdown Current at VIN = 5 V
● Internally Compensated Current-mode Control
● Cycle-by-Cycle Current Limit
● Input Voltage UVLO
● Overcurrent Protection
● Thermal Shutdown 2
APPLICATIONS
● LED Drivers● Constant Current Sources
● Industrial Lighting
● LED Flashlights Typical Application Circuit D2 3
DESCRIPTION
Switching frequency is internally set to 1.6 MHz, allowing small surface mount inductors and capacitors to be used. With a maximum input voltage of 15 V, the device can drive up to 3 High-Brightness LEDs in series at 1-A forward current, with the single LED forward voltage of approximately 3.7 V. Additional features include user accessible EN/DIM pin for enabling and PWM dimming of LEDs, thermal shutdown, cycle-by-cycle current limit and overcurrent protection.
