Overview
The LM3404HVMRX/NOPB is a monolithic switching regulator designed by Texas Instruments to deliver constant currents to high power LEDs. This device is part of the LM3404 and LM3404HV series, which are ideal for automotive, industrial, and general lighting applications. The LM3404HVMRX/NOPB features an integrated 1-A MOSFET and operates in a hysteretic mode, eliminating the need for small-signal control loop compensation. It supports PWM dimming, low-power shutdown, and thermal shutdown protection, making it a versatile and reliable choice for LED driver applications.
Key Specifications
| Parameter | LM3404 | LM3404HV |
|---|---|---|
| Input Voltage Range (VIN) | 6 V to 42 V | 6 V to 75 V |
| Output Current | Up to 1.2 A | Up to 1.2 A |
| Switch On-Resistance (RDS-ON) | 0.37 Ω to 0.75 Ω | 0.37 Ω to 0.75 Ω |
| Thermal Shutdown Threshold | 165°C (typical) | 165°C (typical) |
| Thermal Shutdown Hysteresis | 25°C (typical) | 25°C (typical) |
| Package Type | SOIC-8, SO PowerPAD-8 | SOIC-8, SO PowerPAD-8 |
| Junction Temperature Range | –40°C to 125°C | –40°C to 125°C |
| Minimum Off-Time | 270 ns | 270 ns |
Key Features
- Integrated 1-A MOSFET switch with a current limit of 1.5 A (typical)
- Wide input voltage range: 6 V to 42 V for LM3404 and 6 V to 75 V for LM3404HV
- No control loop compensation required due to hysteretic mode operation
- Separate PWM dimming and low power shutdown
- Supports all-ceramic output capacitors and capacitor-less outputs
- Thermal shutdown protection
- Broken or open LED protection
- Fast output enable and disable function
Applications
- LED Drivers
- Constant Current Sources
- Automotive Lighting
- General Illumination
- Industrial Lighting
Q & A
- What is the primary function of the LM3404HVMRX/NOPB? The primary function is to deliver constant currents to high power LEDs.
- What is the input voltage range for the LM3404 and LM3404HV? The input voltage range is 6 V to 42 V for LM3404 and 6 V to 75 V for LM3404HV.
- What is the maximum output current of the LM3404HVMRX/NOPB? The maximum output current is up to 1.2 A.
- Does the LM3404HVMRX/NOPB require control loop compensation? No, it does not require control loop compensation due to its hysteretic mode operation.
- What types of protection does the LM3404HVMRX/NOPB offer? It offers thermal shutdown protection, broken or open LED protection, and overvoltage protection.
- How can the LM3404HVMRX/NOPB be shut down to a low-power state? It can be shut down by grounding the RON pin with a signal-level MOSFET or logic gates.
- What is the thermal shutdown threshold of the LM3404HVMRX/NOPB? The thermal shutdown threshold is 165°C (typical) with a 25°C hysteresis.
- What packages are available for the LM3404HVMRX/NOPB? It is available in SOIC-8 and SO PowerPAD-8 packages.
- Does the LM3404HVMRX/NOPB support PWM dimming? Yes, it supports PWM dimming for adjusting the average light output of the LED array.
- What is the minimum off-time for the LM3404HVMRX/NOPB? The minimum off-time is 270 ns.
