Texas Instruments LM3409

Description

The LM3409/09N/09HV/09Q/09QHV are P-channel MosFET (PFET) controllers for step-down (buck) current regulators. They offer wide input voltage range, high-side differential current sense with low adjustable threshold voltage and fast output enable/disable function and a thermally enhanced VSSOP-10 package. These features combine to make the LM3409 family of devices ideal for use as constant current sources for driving LEDs whereforward currents up to 5A are easily achievable.The LM3409 devices use Constant Off-Time (COFT) control to regulate an accurate constant current without the need for external control loopcompensation. Analog and PWM dimming are easy to implement and result in a highly linear dimming range with excellent achievable contrast ratios.Programmable UVLO, low-power shutdown, and thermal shutdown complete the feature set.The LM3409/09Q/09N have an operational input voltage range up to 42V, while the LM3409HV/QHV are high voltage options with an input voltage range up to 75V. The LM3409/09HV/09Q/09QHV come in a thermally enhanced 10-lead VSSOP package, while the LM3409N comes in a 14-lead PDIP package. The LM3409Q/LM3409QHV are automotive grade products that are AEC-Q100 grade 1 qualified.

Features

• LM3409Q/LM3409QHV is an Automotive Grade Product That is AEC-Q100 Grade 1 Qualified
• 2 ohm, 1A Peak MosFET Gate Drive
• VIN Range: 6V to 42V (LM3409/LM3409Q/LM3409N)
• VIN Range: 6V to 75V (LM3409HV/LM3409QHV)
• Differential, High-side Current Sense
• Cycle-by-Cycle Current Limit
• No Control Loop Compensation Required
• 10,000:1 PWM Dimming Range
• 250:1 Analog Dimming Range
• Supports All-Ceramic Output Capacitors and Capacitor-less Outputs
• Low Power Shutdown and Thermal Shutdown
• Thermally Enhanced VSSOP-10 Package
• Dual Inline Package (LM3409N)

Typical applications

• LED Driver
• General Illumination
• Constant Current Source
• Automotive Lighting

More information

• Datasheet
• IC product information