Overview
The LM3405XMKX/NOPB is a 1.6-MHz, 1-A constant current buck regulator designed by Texas Instruments for powering high-brightness LEDs. This device offers a simple and high-efficiency solution for LED lighting applications. With an operating input voltage range of 3 V to 15 V, it can drive up to 5 high-brightness LEDs in series at a forward current of 1 A. The LM3405 features a thin SOT-23-THIN package, making it suitable for space-constrained designs.
Key Specifications
| Parameter | Value |
|---|---|
| Input Voltage Range | 3 V to 15 V |
| Maximum Output Current | 1 A |
| Switching Frequency | 1.6 MHz |
| Quiescent Current (Typ) | 1.8 mA |
| Operating Temperature Range | -40°C to 125°C |
| Package Type | SOT-23-THIN (DDC) |
| Number of Pins | 6 |
| Maximum Output Voltage | 13.5 V |
| Minimum Output Voltage | 0.2 V |
| Reference Voltage | 0.205 V |
| Shutdown Current at VIN = 5 V | 40 nA |
| NMOS Switch Resistance | 300 mΩ |
Key Features
- VIN operating range of 3 V to 15 V
- Drives up to 5 high-brightness LEDs in series at 1 A
- Thin SOT-23-THIN package
- 1.6-MHz switching frequency allowing small surface mount inductors and capacitors
- 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 and overcurrent protection
- Input voltage UVLO and thermal shutdown
Applications
- LED Drivers
- Constant Current Sources
- Industrial Lighting
- LED Flashlights
Q & A
- What is the maximum input voltage for the LM3405XMKX/NOPB?
The maximum input voltage is 15 V.
- How many high-brightness LEDs can the LM3405XMKX/NOPB drive in series?
It can drive up to 5 high-brightness LEDs in series at 1 A.
- What is the switching frequency of the LM3405XMKX/NOPB?
The switching frequency is internally set to 1.6 MHz.
- What is the quiescent current of the LM3405XMKX/NOPB?
The quiescent current is typically 1.8 mA.
- What are the key protection features of the LM3405XMKX/NOPB?
The device includes cycle-by-cycle current limit, overcurrent protection, input voltage UVLO, and thermal shutdown.
- How does the EN/DIM pin function on the LM3405XMKX/NOPB?
The EN/DIM pin is used for enabling the device and for PWM dimming of LEDs.
- What is the package type and pin count of the LM3405XMKX/NOPB?
The device is packaged in a SOT-23-THIN (DDC) package with 6 pins.
- What is the operating temperature range of the LM3405XMKX/NOPB?
The operating temperature range is -40°C to 125°C.
- What is the reference voltage for the LM3405XMKX/NOPB?
The reference voltage is 0.205 V.
- What is the shutdown current at VIN = 5 V for the LM3405XMKX/NOPB?
The shutdown current is 40 nA at VIN = 5 V.
