Overview
The LM3409MY/NOPB, produced by Texas Instruments, is a P-channel MOSFET (PFET) controller designed for step-down (buck) current regulators. This device is particularly suited for driving high-power LED loads. It features a wide input voltage range, high-side differential current sense, and a thermally enhanced 10-pin HVSSOP package. The LM3409 uses a constant off-time (COFT) control architecture, allowing it to operate in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) without the need for external control loop compensation. This controller supports high-frequency PWM dimming and analog dimming, making it versatile for various LED driver applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | HVSSOP (DGQ) | |
| Pins | 10 | |
| Operating Temperature Range | -40 to 125 | °C |
| Input Voltage Range (LM3409, LM3409-Q1) | 6 to 42 | V |
| Input Voltage Range (LM3409HV, LM3409HV-Q1) | 6 to 75 | V |
| MOSFET Gate Drive Resistance | 2 Ω | |
| MOSFET Gate Drive Peak Current | 1 A | |
| PWM Dimming Range | 10,000:1 | |
| Analog Dimming Range | 250:1 | |
| Junction Temperature Range | -40 to 125 | °C |
| Thermal Resistance (Junction-to-Ambient) | 54.4 | °C/W |
Key Features
- LM3409-Q1 and LM3409HV-Q1 are Automotive Grade Products: AEC-Q100 Grade 1 Qualified.
- 2-Ω, 1-A Peak MOSFET Gate Drive.
- Differential, High-Side Current Sense with low adjustable threshold voltage.
- Cycle-by-Cycle Current Limit.
- No Control Loop Compensation Required.
- 10,000:1 PWM Dimming Range and 250:1 Analog Dimming Range.
- Supports All-Ceramic Output Capacitors and Capacitor-less Outputs.
- Low-Power Shutdown and Thermal Shutdown.
- Thermally Enhanced 10-Pin, HVSSOP Package.
Applications
- LED Driver.
- Constant Current Source.
- Automotive Lighting.
- General Illumination).
Q & A
- What is the primary function of the LM3409MY/NOPB?
The LM3409MY/NOPB is a P-channel MOSFET (PFET) controller for step-down (buck) current regulators, primarily used for driving high-power LED loads).
- What is the input voltage range for the LM3409 and LM3409-Q1?
The input voltage range for the LM3409 and LM3409-Q1 is 6 V to 42 V).
- What is the input voltage range for the LM3409HV and LM3409HV-Q1?
The input voltage range for the LM3409HV and LM3409HV-Q1 is 6 V to 75 V).
- What type of dimming does the LM3409 support?
The LM3409 supports both PWM dimming with a 10,000:1 range and analog dimming with a 250:1 range).
- Does the LM3409 require external control loop compensation?
No, the LM3409 does not require external control loop compensation due to its constant off-time (COFT) control architecture).
- What is the maximum junction temperature for the LM3409?
The maximum junction temperature for the LM3409 is 125°C).
- What type of package does the LM3409MY/NOPB come in?
The LM3409MY/NOPB comes in a thermally enhanced 10-pin HVSSOP (DGQ) package).
- Is the LM3409 suitable for automotive applications?
Yes, the LM3409-Q1 and LM3409HV-Q1 are AEC-Q100 Grade 1 Qualified, making them suitable for automotive applications).
- What is the thermal resistance (junction-to-ambient) of the LM3409 in the HVSSOP package?
The thermal resistance (junction-to-ambient) of the LM3409 in the HVSSOP package is 54.4°C/W).
- Does the LM3409 support capacitor-less outputs?
Yes, the LM3409 supports both all-ceramic output capacitors and capacitor-less outputs).
