Specifications
| Type | Description |
|---|---|
| Part Number | LM3409 |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Package / Case | 10-pin HVSSOP, 3.00 mm x 3.00 mm; 14-pin PDIP, 19.177 mm x 6.35 mm |
| Component Type | Power_IC |
| Input Voltage Range, LM3409 and LM3409-Q1 | 6-42 V |
| Input Voltage Range, LM3409HV and LM3409HV-Q1 | 6-75 V |
| Maximum Input Voltage, LM3409 and LM3409-Q1 | 42 V |
| Maximum Input Voltage, LM3409HV and LM3409HV-Q1 | 75 V |
| Automotive Qualification, LM3409-Q1 and LM3409HV-Q1 only | AEC-Q100 Grade 1 qualified |
| MOSFET Gate Drive | 2 ohm, 1 A peak |
| PWM Dimming Range | 10000:1 |
| Analog Dimming Range | 250:1 |
| LED Forward Current Capability | Up to 5 A |
| Junction Temperature Range | -40 to 125 °C |
| Absolute Maximum VIN, EN, UVLO to GND, LM3409 and LM3409-Q1 | -0.3 to 45 V |
| Absolute Maximum VIN, EN, UVLO to GND, LM3409HV and LM3409HV-Q1 | -0.3 to 76 V |
| Absolute Maximum VIN to VCC, PGATE | -0.3 to 7 V |
| Absolute Maximum VIN to PGATE, 100 ns | -2.8 to 9.5 V |
| Absolute Maximum VIN to CSP, CSN | -0.3 to 0.3 V |
| Absolute Maximum COFF to GND | -0.3 to 4 V |
| COFF Current, Continuous Absolute Maximum | ±1 mA |
| IADJ Current, Continuous Absolute Maximum | ±5 mA |
| Maximum Junction Temperature | 150 °C |
| Storage Temperature | -65 to 125 °C |
| Lead Temperature, Soldering 10 s | 260 °C |
| Reflow Temperature, 15 s | 260 °C |
| HBM ESD Rating, LM3409 DGQ and NFF | ±1000 V |
| CDM ESD Rating, LM3409 DGQ and NFF | ±1000 V |
| HBM ESD Rating, LM3409-Q1 DGQ and NFF | ±2000 V |
| CDM ESD Rating, LM3409-Q1 DGQ and NFF | ±1000 V |
| Junction-to-Ambient Thermal Resistance, DGQ 10-pin HVSSOP | 54.4 °C/W |
| Junction-to-Ambient Thermal Resistance, NFF 14-pin PDIP | 49 °C/W |
| Junction-to-Case Top Thermal Resistance, DGQ 10-pin HVSSOP | 53.7 °C/W |
| Junction-to-Case Top Thermal Resistance, NFF 14-pin PDIP | 36.3 °C/W |
| Junction-to-Board Thermal Resistance, DGQ 10-pin HVSSOP | 33.8 °C/W |
| Junction-to-Board Thermal Resistance, NFF 14-pin PDIP | 28.9 °C/W |
| Peak Current Comparator Threshold, VADJ = 1 V | 188 min, 198 typ, 208 max mV |
| Peak Current Comparator Threshold, VADJ = VADJ-OC | 231 min, 246 typ, 261 max mV |
| IADJ Gain | 0.2 V/V |
| IADJ Open Circuit Voltage | 1.189 min, 1.243 typ, 1.297 max V |
| IADJ Pin Current | 3.8 min, 5 typ, 6.4 max µA |
| CSN Falling Delay | 38 ns |
| Operating Input Current | 2 mA |
| Shutdown Input Current | 110 µA |
| Driver Output Resistance, Sourcing 50 mA | 2 ohm |
| Driver Output Resistance, Sinking 50 mA | 2 ohm |
| VCC Regulator Voltage | 5.5 min, 6 typ, 6.5 max V |
| VCC Undervoltage Lockout Threshold | 3.73 V |
| VCC UVLO Hysteresis | 283 mV |
| VCC Regulator Current Limit | 30 typ, 45 max mA |
| Off-Time Threshold | 1.122 min, 1.243 typ, 1.364 max V |
| COFF Threshold to PGATE Falling Delay | 25 ns |
| Minimum On-Time | 115 typ, 211 max ns |
| Maximum Off-Time | 300 µs |
| UVLO Pin Current | 10 nA |
| Rising UVLO Threshold | 1.175 min, 1.243 typ, 1.311 max V |
| UVLO Hysteresis Current | 22 µA |
| EN Pin Current | 10 nA |
| EN Pin Rising Threshold | 1.74 V |
| EN Pin Falling Threshold | 0.5 V |
| EN Pin Hysteresis | 420 mV |
| EN Pin Rising Delay | 42 ns |
| EN Pin Falling Delay | 21 ns |
| Datasheet Status | request_only |
Product Overview
The LM3409 is a Texas Instruments P-FET buck LED controller in the Power_Management category. It is specified for LED current-regulator designs using a peak current comparator and an external PFET gate driver. Standard LM3409 and LM3409-Q1 variants have a 6-42 V recommended input range, while LM3409HV and LM3409HV-Q1 variants extend the recommended input range to 6-75 V.
Key control parameters include a 188 mV to 208 mV peak current comparator threshold at VADJ = 1 V, a 0.2 V/V IADJ gain, 10000:1 PWM dimming, and 250:1 analog dimming. The description indicates LED forward currents up to 5 A are achievable.
Package options include a 10-pin HVSSOP measuring 3.00 mm x 3.00 mm and a 14-pin PDIP measuring 19.177 mm x 6.35 mm. Assembly-related limits include 260 °C lead temperature for 10 s and 260 °C infrared or convection reflow for 15 s. LM3409-Q1 and LM3409HV-Q1 versions are AEC-Q100 Grade 1 qualified.
Key Features
- P-FET buck LED controller for power-management designs
- 6-42 V input range for LM3409 variants
- 6-75 V input range for LM3409HV variants
- 2 ohm, 1 A peak PFET gate driver
- 10000:1 PWM dimming range
- 250:1 analog dimming range
- LED forward currents up to 5 A
- -40 to 125 °C junction operating range
- AEC-Q100 Grade 1 qualification on Q1 versions
- 10-pin HVSSOP and 14-pin PDIP package options
Typical Applications
- Buck LED current regulators
- PWM-dimmed LED drivers
- Analog-dimmed LED drivers
- Up to 5 A LED strings
- Automotive LED controllers using Q1 variants
- 6-42 V input LED systems
- 6-75 V HV LED systems
Procurement Notes
When requesting a quote for LM3409, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For power IC and power device sourcing, voltage rating, current rating, power dissipation, package thermal performance, protection features, qualification grade and application conditions should be reviewed before approval.
FAQ
What input voltage range does the LM3409 support?
The LM3409 and LM3409-Q1 have a 6-42 V recommended input range. LM3409HV and LM3409HV-Q1 variants extend the recommended operating input range to 6-75 V.
What dimming ranges are specified for the LM3409?
The extracted datasheet facts specify a 10000:1 PWM dimming range and a 250:1 analog dimming range for the LM3409 P-FET buck LED controller.
Which LM3409 versions are automotive qualified?
Automotive qualification applies to LM3409-Q1 and LM3409HV-Q1 only. These variants are listed as AEC-Q100 Grade 1 qualified in the extracted datasheet facts.
What package options are listed for the LM3409?
The listed package options are a 10-pin HVSSOP measuring 3.00 mm x 3.00 mm and a 14-pin PDIP measuring 19.177 mm x 6.35 mm.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 12, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.