Overview
The LM3404HVMAX/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 LM3404HVMAX/NOPB features a high-side N-channel MOSFET switch with a current limit of 1.5-A (typical) for step-down (Buck) regulators. It supports PWM dimming, low-power shutdown, and thermal shutdown, making it versatile for various lighting needs.
Key Specifications
| Parameter | LM3404HVMAX/NOPB | Unit |
|---|---|---|
| Input Voltage Range | 6 V to 75 V | V |
| Output Current | Up to 1.2 A | A |
| On-Resistance (RDS-ON) | 0.37 to 0.75 Ω | Ω |
| Thermal Shutdown Threshold | 165 °C | °C |
| Thermal Shutdown Hysteresis | 25 °C | °C |
| Package Type | SOIC-8, SO PowerPAD-8 | - |
| Junction Temperature Range | -40 to 125 °C | °C |
| Minimum Off-Time | 270 ns | ns |
Key Features
- Integrated 1-A MOSFET switch
- No control loop compensation required
- Separate PWM dimming and low power shutdown
- Supports all-ceramic output capacitors and capacitor-less outputs
- Thermal shutdown protection
- Broken or open LED protection
- Internal 7-V linear regulator for biasing
- Fast transient response and simple output overvoltage protection
Applications
- LED Drivers
- Constant Current Sources
- Automotive Lighting
- General Illumination
- Industrial Lighting
Q & A
- What is the input voltage range of the LM3404HVMAX/NOPB?
The input voltage range is from 6 V to 75 V.
- What is the maximum output current of the LM3404HVMAX/NOPB?
The maximum output current is up to 1.2 A.
- Does the LM3404HVMAX/NOPB support PWM dimming?
Yes, it supports PWM dimming.
- What is the thermal shutdown threshold of the LM3404HVMAX/NOPB?
The thermal shutdown threshold is 165 °C.
- What types of packages are available for the LM3404HVMAX/NOPB?
The device is available in SOIC-8 and SO PowerPAD-8 packages.
- Does the LM3404HVMAX/NOPB have built-in protection features?
Yes, it includes thermal shutdown protection, broken or open LED protection, and low-power shutdown.
- What is the minimum off-time of the LM3404HVMAX/NOPB?
The minimum off-time is 270 ns.
- How does the LM3404HVMAX/NOPB regulate the output voltage?
The device uses a controlled on-time (COT) architecture, combining hysteretic mode control and a one-shot on-timer that varies inversely with input voltage.
- What is the purpose of the internal 7-V linear regulator in the LM3404HVMAX/NOPB?
The internal 7-V linear regulator is used for biasing and must be bypassed to ground with a minimum 0.1-µF ceramic capacitor.
- Can the LM3404HVMAX/NOPB be used in automotive applications?
Yes, it is suitable for automotive lighting applications due to its wide input voltage range and robust protection features.
