Overview
The LM3429MHX/NOPB is a versatile high-voltage N-channel MosFET controller designed for constant current LED drivers. Produced by Texas Instruments, this component is highly flexible and can be configured in various topologies such as buck, boost, buck-boost, and SEPIC. It is ideal for a wide range of applications, including LED drivers in automotive, general illumination, and other high-voltage systems. The LM3429 features a high-voltage startup regulator and an internal PWM controller, enabling compact and efficient solutions.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage (VIN) | 4.5 | 75 | V | |
| Maximum Junction Temperature | 125 | °C | ||
| Maximum Lead Temperature (Reflow and Solder) | 260 | °C | ||
| Storage Temperature (Tstg) | -65 | 150 | °C | |
| Package Type | HTSSOP (14 pins) | |||
| Switching Frequency | Up to 2 MHz | |||
| Gate Driver Current | 1 A (peak) | |||
| High-Side Current Sense Voltage | 1.24 V |
Key Features
- High-voltage N-channel MosFET controller for LED drivers
- Configurable in buck, boost, buck-boost, and SEPIC topologies
- Input voltage range from 4.5 V to 75 V
- Adjustable high-side current sense voltage for tight regulation of LED current
- Predictive Off-time (PRO) control combining peak current-mode control and predictive off-timer
- Analog and PWM dimming capabilities
- Overvoltage protection, undervoltage lock-out, cycle-by-cycle current limit, and thermal shutdown
- High-voltage startup regulator and internal PWM controller with adjustable switching frequencies up to 2 MHz
- Low profile 14-lead HTSSOP package
Applications
- LED drivers in automotive applications (LM3429-Q1 is AEC-Q100 Grade 1 Qualified)
- General illumination devices
- Indoor and outdoor solid-state lighting (SSL)
- Constant-current regulators
Q & A
- What are the main topologies supported by the LM3429?
The LM3429 supports buck, boost, buck-boost, and SEPIC topologies.
- What is the input voltage range of the LM3429?
The input voltage range is from 4.5 V to 75 V.
- What is the maximum switching frequency of the LM3429?
The maximum switching frequency is up to 2 MHz.
- Does the LM3429 support dimming?
- What kind of protection features does the LM3429 have?
The LM3429 includes overvoltage protection, undervoltage lock-out, cycle-by-cycle current limit, and thermal shutdown.
- What is the package type of the LM3429?
The LM3429 comes in a 14-lead HTSSOP package.
- Is the LM3429 suitable for automotive applications?
- How does the LM3429 regulate the LED current?
The LM3429 uses an adjustable high-side current sense voltage and predictive off-time (PRO) control to regulate the LED current.
- What is the maximum junction temperature of the LM3429?
The maximum junction temperature is 125°C.
- Does the LM3429 have thermal shutdown protection?
