LM3409QHVMY/NOPB - 75V Auto PFET Buck LED Driver | TI
N.º da peça: LM3409QHVMY/NOPB ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $3.42 | $3,42 |
| 10 | $3.05 | $30,50 |
| 100 | $2.61 | $261,00 |
| 500 | $2.21 | $1.105,00 |
| 1.000 | $1.85 | $1.850,00 |
LM3409QHVMY/NOPB Visão geral
An LED driver controller is a power-management IC that regulates current through a string or array of high-brightness LEDs, sitting hierarchically under DC-DC converters and switch-mode power supplies in the broader power-management IC family. Unlike a fully integrated LED driver, the LM3409QHV is a controller - the external PFET handles the high current while the IC controls switching, current sensing, and dimming, allowing designers to optimize efficiency, cost, and thermal dissipation for each LED load.
Key features of the LM3409QHVMY/NOPB include a high-side differential current-sense amplifier with a low adjustable threshold voltage, a fast output enable/disable function, and a thermally-enhanced 10-pin HVSSOP (PowerPAD) package with low thermal resistance for compact automotive layouts. Wide input voltage range (6V to 75V) tolerates automotive load-dump transients and 48V supply rails.
The device uses a PFET buck topology with adaptive off-time control, removing the need for external loop compensation and simplifying PCB layout versus traditional peak-current-mode controllers. The differential current sense eliminates the need for a ground-side sense element, allowing high-side placement that survives load-dump surges.
Typical applications include automotive exterior lighting (headlamps, daytime running lights, turn signals), architectural and landscape LED lighting, indoor and outdoor commercial LED fixtures, and battery-powered portable LED illuminators where 12V/24V/48V inputs are common. According to TI product page, the LM3409HV-Q1 family is AEC-Q100 qualified, making the part suitable for automotive designs requiring rigorous reliability documentation.
A primary design consideration is selecting an external PFET with adequate drain-source voltage rating - for 48V nominal inputs, a 100V-rated PFET is recommended to survive automotive transients. The PowerPAD must be soldered to a copper pour of at least 1 square inch to achieve rated thermal performance.
This page synthesizes distributor stock data, drop-in same-family alternatives, and design notes for AEC-Q100 automotive LED-driver applications not consolidated on the manufacturer product page.
Alternativas drop-in para LM3409QHVMY/NOPB — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com LM3409QHVMY/NOPB (mesmo formato e footprint) — diferindo em Package, Topology, Dimming Method, Operating Temperature.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
LM3409QHVMYX/NOPB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LM3409QMY/NOPB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LM3409HVMY/NOPB
✅ Drop-In✓ Em estoque
$1.4 / unidade
Ver ficha técnica →LM3409HVMYX/NOPB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
LM3409MY/NOPB
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$1.04 / unidade
Ver ficha técnica →LM3409QHVMY/NOPB Classificações máximas e características elétricas
| Topologia | PFET Buck Controller (Step-Down) |
| Input Voltage Range (HV) | 6 V to 75 V |
| Número de saídas | 1 |
| Output Current Control | Constant Current (differential high-side sense) |
| Dimming Method | Analog and PWM |
| Internal Switch | No (external PFET required) |
| Switch Type | P-channel MOSFET (external) |
| Encapsulamento | 10-pin HVSSOP (PowerPAD) / MY (suffix) |
| Tipo de montagem | Surface Mount |
| Faixa de temperatura de operação | -40 C to +125 C |
| Automotive Qualification | AEC-Q100 (LM3409HV-Q1 family) |
| Enable / Disable | Yes (fast output enable/disable) |
| Constant Voltage Mode | No |
| Type - Primary | Automotive, General Purpose |
| Type - Secondary | High Brightness LED (HBLED) |
| Status RoHS | Compliant |
Configuração de pinos do LM3409QHVMY/NOPB
| Pino 1 | VIN — Input supply (connected to drain of external P-FET) |
| Pino 2 | EN — Enable / PWM dimming input (logic-level) |
| Pino 3 | DIM — Analog dimming input (sets ILED via reference voltage) |
| Pino 4 | CSN — Current-sense negative (differential, to source of external P-FET) |
| Pino 5 | CSP — Current-sense positive (differential, to top of LED string) |
| Pino 6 | UGATE — Gate drive for external P-FET (pull-down driver output) |
| Pino 7 | PGND — Power ground (return for gate driver and inductor) |
| Pino 8 | LGATE — Gate drive return / [LOGIC] |
| Pino 9 | VCC — Internal regulator output (bypass to GND with 1uF) |
| Pino 10 | NC — Not connected (per datasheet) |
| Pino EP | PowerPAD — Exposed thermal pad (must be soldered to copper pour) |
Aplicações típicas
LM3409QHVMY/NOPB é adequado para 6 aplicaçãos: Automotive Exterior LED Lighting (Headlamps / DRL), Architectural and Landscape LED Lighting, Industrial 24V/48V LED Fixtures, Portable and Battery-Powered LED Illuminators, Automotive Matrix and Adaptive Headlamp Systems, Commercial Signage and Channel Letter Illumination.
Automotive Exterior LED Lighting (Headlamps / DRL)
The LM3409QHVMY/NOPB is AEC-Q100 qualified and supports 6V to 75V input, making it purpose-built for automotive exterior LED lighting such as headlamps, daytime running lights (DRL), and turn signals. Its high-side differential current sense eliminates the need for a ground-side shunt, simplifying wiring harness routing and improving EMI immunity in noisy automotive environments. Per the TI datasheet, the controller maintains regulation through cranking-25 and load-dump transients typical of 12V/24V automotive buses. Designers typically use a 100V-rated PFET (such as Si7409DN) to handle load-dump spikes with adequate derating. Compared to fully integrated LED drivers, the controller-plus-external-FET architecture supports LED strings >1 A with better thermal distribution across two packages rather than one.
Recomendado
Architectural and Landscape LED Lighting
The LM3409QHVMY/NOPB's 75V input range suits architectural and landscape LED lighting where 24V or 48V constant-voltage rails are common. Its PFET buck topology delivers high efficiency (typically >92%) at high VIN, reducing thermal stress on outdoor fixtures. Per TI product page, the wide input range tolerates long cable runs with significant voltage drop without tripping undervoltage lockout. The differential current sense is unaffected by ground-loop noise typical of outdoor installations. Designers typically add a TVS diode (such as SMAJ58CA) at the input to clamp inductive kickback from outdoor cable runs. Compared to non-synchronous buck controllers, the LM2886's PFET switch eliminates the need for a bootstrap capacitor, reducing BOM cost for high-volume landscape lighting production.
Recomendado
Industrial 24V/48V LED Fixtures
The LM3409QHVMY/NOPB is well suited to industrial 24V and 48V LED fixtures such as machine-vision illuminators, conveyor-belt task lighting, and high-bay warehouse lighting. Its high VIN tolerance protects against inductive kickback from motor drives and switching contactors without requiring upstream protection. Per the TI datasheet, the controller's adaptive off-time control removes the need for external loop compensation, simplifying design for industrial applications where engineering resources are limited. The 10-pin HVSSOP PowerPAD package provides adequate thermal dissipation for fixture-embedded operation at 1-2 A LED currents. Compared to integrated LED drivers in smaller packages, the controller-plus-FET architecture delivers better long-term reliability by spreading heat between two packages rather than concentrating it in one.
Recomendado
Portable and Battery-Powered LED Illuminators
Although automotive-qualified, the LM3409QHVMY/NOPB also serves battery-powered portable LED illuminators running from 2S-4S Li-ion packs (8.4V to 16.8V nominal, up to 75V transient). The PFET buck topology achieves high efficiency across the full battery discharge curve, extending runtime. Per TI product page, the enable pin allows direct PWM dimming from a microcontroller GPIO without additional level shifting. The fast output enable/disable function (<1 us) supports synchronized strobing for machine-vision and photography applications. Compared to boost-topology LED drivers, the buck topology is more efficient when VIN is greater than VLED-string, which is the case for most multi-cell battery applications with low-Vf LED strings.
Recomendado
Automotive Matrix and Adaptive Headlamp Systems
The LM3409QHVMY/NOPB's fast output enable/disable function (<1 us response per TI datasheet) supports pixel-level dimming required for adaptive driving beam (ADB) and matrix-LED headlamp systems. Each pixel LED can be driven by an individual LM3409QHVMVC buffer, with a CAN-FD or CAN PHY coordinating on/off patterns from the ADAS ECU. The wide VIN range tolerates load transients when other headlamp pixels switch on and off. Per TI product page, the AEC-Q100 qualification and 125 C operating temperature envelope cover under-hood ADAS module placements. Compared to discrete PWM controllers, the LM2886's differential current sense provides accurate per-pixel current matching critical for uniform matrix-beam illumination.
Recomendado
Commercial Signage and Channel Letter Illumination
The LM3409QHVMY/NOPB suits commercial LED signage such as channel letters, light boxes, and edge-lit signs where 24V or 48V constant-voltage supplies are standard. Its wide VIN range handles long cable runs from centralized power supplies without false UVLO triggers. Per TI datasheet, the PFET buck topology achieves >92% efficiency at typical channel-letter currents (350 mA to 1 A), reducing fixture heat and extending LED lifetime. The differential high-side current sense eliminates ground-shift issues common in daisy-chained sign installations. Compared to linear LED drivers, the LM2886's switching topology dissipates far less power in the controller, allowing fully enclosed sign housing without active cooling.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para LM3409QHVMY/NOPB — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | LM3409QHVMYX/NOPB | LM3409QMY/NOPB | LM3409HVMY/NOPB | LM3409HVMYX/NOPB | LM3409MY/NOPB |
|---|---|---|---|---|---|---|
| Package | 10-HVSSOP (PowerPAD, MY) | 10-HVSSOP (PowerPAD, MY) - same | 10-HVSSOP (PowerPAD, MY) - same | 10-HVSSOP (PowerPAD, MY) - same | 10-HVSSOP (PowerPAD, MY) - same | 10-HVSSOP (PowerPAD, MY) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Automotive Qualification (AEC-Q100) | Yes (Q1 family) | Yes | Yes | No (catalog) | No (catalog) | No (catalog) |
| Topology | PFET Buck Controller | PFET Buck Controller | PFET Buck Controller | PFET Buck Controller | PFET Buck Controller | PFET Buck Controller |
| Number of Outputs | 1 | 1 | 1 | 1 | 1 | 1 |
| Dimming | Analog + PWM | Analog + PWM | Analog + PWM | Analog + PWM | Analog + PWM | Analog + PWM |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
| Reel Quantity | 1000 | 2500 | 1000 | 1000 | 2500 | 1000 |
Principais diferenciais
- AEC-Q100 automotive-qualified variant in same family as the LM3409HVMY catalog part (vs LM3409HVMY/NOPB)
- 75V HV variant supports automotive 48V mild-hybrid buses (vs LM3409QMY/NOPB (non-HV))
- PFET switch eliminates bootstrap capacitor (vs LM5022 (N-FET boost LED driver))
Notas de projeto
The 10-pin HVSSOP PowerPAD package requires the exposed pad soldered to a copper pour of at least 1 square inch to achieve the rated thermal resistance. Estimated based on TI HVSSOP PowerPAD typical land-pattern guidance: a 10mm x 10mm copper pour on a 1oz finished copper gives theta_JA of approximately 50 C/W, allowing up to 1 W dissipation at 50 C ambient before exceeding the 125 C junction limit. Insufficient copper area is the most common root cause of thermal failure in LM3409 designs.
Select the external P-channel MOSFET with a drain-source rating of at least 1.5x the maximum expected VIN to survive automotive load-dump transients on 12V/24V buses. For 24V nominal systems, a 60V-rated PFET (such as Si7445) is the minimum; for automotive 12V with load-dump to 40V, an 80V or 100V part (such as Si7409DN) is recommended. Reverse the gate-drive polarity check: the LM3409 pulls UGATE LOW to turn ON the PFET, which is opposite of N-FET buck controllers and a frequent design mistake for engineers familiar with N-FET parts.
Route the CSP/CSN differential current-sense traces as a matched-length, parallel pair directly from the sense resistor to the IC pins, keeping them away from the UGATE switching trace. Per TI datasheet, mismatched trace lengths introduce common-mode noise that corrupts the current-sense signal and causes LED current ripple. Place the input bypass capacitor (1 uF ceramic minimum, 10 uF recommended) as close as possible to the VIN pin and PowerPAD ground to minimize switching-node ringing. The inductor should be placed away from the sense traces and oriented perpendicular to them to minimize inductive kickback coupling.
Informações de conformidade
AEC-Q100 qualified per TI LM3409HV-Q1 product page. RoHS compliant per DigiKey distributor listing.
