LM3404HVMAX/NOPB - 75V 1A Buck LED Driver SOIC-8 | Texas Instruments
MPN: LM3404HVMAX/NOPB ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.65 | $1.65 |
| 10 | $1.48 | $14.80 |
| 100 | $1.32 | $132.00 |
| 500 | $1.18 | $590.00 |
| 1,000 | $1.05 | $1,050.00 |
LM3404HVMAX/NOPB Overview
A buck LED driver is a type of switching converter whose feedback loop regulates average inductor current rather than output voltage, producing a constant current that is ideally suited to drive the forward string of one or more series-connected high-brightness LEDs. Within the broader taxonomy it belongs to the LED driver family of power management ICs, sitting under DC-DC converters and used wherever a regulated, dimmable current must be delivered to a solid-state lighting load. The HV rating is the key differentiator versus the standard LM3404 (42 V max) and makes the LM3404HV suitable for 24 V industrial rails, 36 V telecom supplies, and automotive 12 V/24 V bus transients.
Key features include a wide 6 V to 75 V input range, integrated 1.5 A N-channel MOSFET, simple hysteretic on-time control, PWM dimming capability, and a thermal-shutdown-protected SOIC-8 footprint. The device requires only an inductor, input/output capacitors, a sense resistor, and a small bootstrap capacitor. The MAX mechanical package offers a thermally enhanced exposed-pad variant in the LM3404HV family line, improving heat extraction for the higher-input-voltage HV part.
Architecturally, the LM3404HV uses a fixed on-time, variable off-time control law where the on-time is set by an external resistor (RON) referenced to VIN. This eliminates the traditional error amplifier and compensation components and yields a fast transient response for LED current changes. The 1.5 A internal switch and 75 V rating are fabricated on a BCDMOS process that integrates the analog control block, gate driver, and power FET in a single die. Efficiencies typically reach 90% in the 24 V-to-700 mA reference design.
Typical applications include MR16 and AR111 LED spotlights, automotive interior/exterior lighting, architectural and signage LED fixtures, 24 V industrial task lighting, and emergency/backup lighting strips. The wide VIN tolerance also suits outdoor and cold-weather systems where the supply rail can reach 60 V before the load is engaged. The integrated switch keeps the BOM small and PCB area below 100 mm² in most constant-current LED designs.
When designing with the LM3404HVMAX/NOPB, observe the minimum on-time at high VIN to avoid LED current ripple spikes, and choose an inductor with low DCR to maintain efficiency. The exposed pad (where present) must be soldered to a sufficient copper pour for continuous 1 A operation at elevated ambient temperatures.
Drop-in alternatives for LM3404HVMAX/NOPB — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LM3404MAX/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
LM3404HVMA/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
LM3404HVMRX/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
LM3404HVMAX
✅ Drop-In📋 Reference alternative (not in catalog)
LM3404HVMAX/NOPB Maximum Ratings & Electrical Characteristics
| Topology | Step-Down (Buck) |
| Number of Outputs | 1 |
| Input Voltage Range | 6 V to 75 V |
| Maximum Output Current | 1.0 A |
| Internal MOSFET Current Limit | 1.5 A (typical) |
| Switch Type | Integrated high-side N-channel MOSFET |
| Control Method | Hysteretic controlled on-time |
| PWM Dimming | Yes |
| Output Type | Constant Current |
| Operating Temperature Range | -40 C to +125 C |
| Package | 8-pin SOIC (MAX) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
LM3404HVMAX/NOPB Pin Configuration
| Pin 1 | SW — Switch node - drain of internal N-channel MOSFET |
| Pin 2 | BST — Bootstrap capacitor node for high-side gate drive |
| Pin 3 | GND — Ground return |
| Pin 4 | EN/PWM — Enable and PWM dimming input (active high) |
| Pin 5 | VCC — Internal 7 V LDO output (decouple with 0.1 uF) |
| Pin 6 | RON — On-time programming resistor to VIN |
| Pin 7 | CS — Current sense input (200 mV threshold to GND) |
| Pin 8 | VIN — Input supply voltage (6 V to 75 V) |
| Pin EP | GND (Thermal Pad) — Exposed thermal pad - connect to GND for heat sinking |
Typical Applications
LM3404HVMAX/NOPB is suitable for 6 applications: MR16 / AR111 LED Retrofit Lamp, Automotive 12 V / 24 V Interior and Exterior Lighting, Industrial 24 V LED Task Lighting, Architectural and Signage LED Fixtures, Emergency and Backup Lighting Strips, Outdoor and Cold-Weather LED Systems.
MR16 / AR111 LED Retrofit Lamp
The LM3404HVMAX/NOPB is a popular fit for MR16 and AR111 retrofit LED spotlight designs because its 75 V input rating tolerates rectified 12 VAC and the inductive ringing produced by the magnetic transformer. The 1.0 A output current drives 3 to 7 series-connected high-brightness white LEDs with a single inductor, a sense resistor, and a bootstrap capacitor, keeping total BOM cost and PCB area below 100 mm squared. The integrated 1.5 A high-side N-channel MOSFET avoids an external power switch in the tight MR16 lamp base. Hysteretic on-time control provides flicker-free light across the entire dimming range, and PWM dimming on the EN pin accepts trailing-edge or 0-10 V dimmer signals after a small front-end circuit.
Recommended
Automotive 12 V / 24 V Interior and Exterior Lighting
The 75 V input rating of the LM3404HVMAX/NOPB easily absorbs 12 V and 24 V automotive bus transients including jump-start, load-dump, and ISO 7637-2 events, making it ideal for brake lights, turn signals, daytime running lights, interior mood lighting, and license-plate illumination. The constant-current regulation prevents brightness shift across the -40 C to +125 C automotive temperature range, and the SOIC-8 (MAX) exposed pad allows PCB copper-only thermal management. The 1.0 A capability strings 3 to 10 high-brightness LEDs in series, simplifying wiring and current-balance design. A simple TVS diode and bulk input capacitor complete an AEC-style protection front end for production vehicles.
Recommended
Industrial 24 V LED Task Lighting
Factory-floor task lighting, machine-vision illuminators, and industrial signage benefit from the LM3404HVMAX/NOPB's wide 6 V to 75 V input range, which accepts 24 V industrial rails with large inductive spikes. The 1.0 A output current drives 7 to 9 series-connected high-brightness LEDs from a single buck stage at approximately 90 percent efficiency in the TI reference design. The integrated power switch reduces the BOM and shrinks the PCB to fit inside machine-vision light bars and conduit-rated fixtures. Hysteretic on-time control delivers fast transient response when individual LEDs fail open, allowing the rest of the string to continue operating at the set current.
Recommended
Architectural and Signage LED Fixtures
Architectural cove lighting, wall-wash fixtures, and large-scale LED signage strips require a compact, efficient constant-current driver that accepts universal 12 V to 48 V supplies, and the LM3404HVMAX/NOPB fits this role. The 1.0 A output drives high-output LED strings with uniform brightness, while the small SOIC-8 footprint enables slim, linear fixture designs. PWM dimming via the EN pin connects directly to DMX or 0-10 V control systems after a small interface circuit. The wide 75 V input also supports longer LED runs with larger voltage drops, reducing the number of driver drop-points in a long linear cove installation.
Recommended
Emergency and Backup Lighting Strips
Emergency egress lighting and battery-backed LED strips depend on a wide-input, compact, constant-current driver, which the LM3404HVMAX/NOPB provides. The 6 V to 75 V input range accepts battery packs from 12 V lead-acid to 48 V LiFePO4 stacks, with the HV rating tolerating transient overshoots during load transfer. The 1.0 A output maintains a steady LED current as the battery discharges, extending usable run time versus resistor-limited designs. The integrated thermal shutdown and current limit protect the fixture during fault conditions such as output short or LED string open, which is critical in safety-rated emergency luminaires.
Recommended
Outdoor and Cold-Weather LED Systems
Outdoor LED lighting, streetlight retrofits, and cold-storage illumination face wide temperature swings and high supply-rail transients from long cable runs. The LM3404HVMAX/NOPB's 75 V input rating and -40 C to +125 C operating range handle these conditions without derating. The 1.0 A output and integrated 1.5 A MOSFET drive long LED strings of 7 to 10 devices in series, simplifying cable routing by using a single high-voltage string rather than parallel runs. The SOIC-8 (MAX) exposed pad allows PCB-only heat sinking in IP65-sealed fixtures where an aluminum heatsink is not practical. PWM dimming supports night-time dimming profiles for energy savings.
Recommended
Recommended Products Summary
Engineering reference data for LM3404HVMAX/NOPB — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM3404MAX/NOPB | LM3404HVMA/NOPB | LM3404HVMRX/NOPB | LM3404HVMAX |
|---|---|---|---|---|---|
| Package | SOIC-8 (MAX) | SOIC-8 (MAX) - same | SOIC-8 (non-MAX) - same pin count | SOIC-8 (MAX) - same | SOIC-8 (MAX) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Voltage Range | 6 V to 75 V | 6 V to 42 V | 6 V to 75 V | 6 V to 75 V | 6 V to 75 V |
| Output Current | 1.0 A | 1.0 A | 1.0 A | 1.0 A | 1.0 A |
| Internal MOSFET Current Limit | 1.5 A (typ) | 1.5 A (typ) | 1.5 A (typ) | 1.5 A (typ) | 1.5 A (typ) |
| Exposed Thermal Pad | Yes (MAX) | Yes (MAX) | No (smaller pad) | Yes (MAX) | Yes (MAX) |
| PWM Dimming | Yes (EN pin) | Yes (EN pin) | Yes (EN pin) | Yes (EN pin) | Yes (EN pin) |
| 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 |
| Top-of-Reel Packaging Code | MAX (SOIC-8 exposed pad, T&R) | MAX (T&R) | MA (Rail/Tube) | MRX (T&R large reel) | MAX (no NOPB) |
Key Differentiators
- Extended 75 V input range for high-voltage rails (vs LM3404MAX/NOPB)
- MAX exposed thermal pad for higher current reliability (vs LM3404HVMA/NOPB)
- Simple hysteretic on-time control without compensation (vs LM3401 (older 1.5 A controller))
Design Notes
Estimated: at VIN = 24 V, VLED = 9 V, and 1.0 A LED current, the LM3404HVMAX/NOPB dissipates roughly (24 - 9) V * 1.0 A = 15 W less LED loss, leaving the IC itself at about 1.5 W of switching+conduction loss. The MAX exposed pad with a 1 square-inch copper pour keeps the junction temperature rise within safe limits. At VIN = 48 V, expect 2 to 3 W of IC loss and provide additional copper area or airflow.
Place the input decoupling capacitor (1 uF X7R minimum) as close as possible to the VIN and GND pins to minimize switching-loop inductance. The bootstrap capacitor between BST and SW (typically 0.1 uF) must be routed on the same side of the PCB to avoid large parasitic inductance that can overstress the internal gate driver. Keep the CS sense-resistor trace short and direct to the GND plane to avoid ground bounce that perturbs the 200 mV current-sense threshold.
Avoid operating at very low on-time near the LM3404HV's minimum tON (~300 ns) at high VIN, because the converter may skip pulses and increase LED current ripple. The RON resistor sets the on-time as tON = 1.34e-10 * RON / VIN, so choose RON such that tON stays above the minimum even at maximum VIN. Also do not exceed the absolute maximum VIN of 75 V, which can be reached on long inductive cables during transients.
Use a single ground plane tied to the GND pin and the exposed pad. Place the LED string, inductor, and freewheeling diode (if external) in a tight loop with the SW pin. The sense resistor (RSENSE) should be a 1 percent or better tolerance part with Kelvin connection back to the GND pin. Route the EN/PWM trace away from the SW node to avoid noise injection into the dimming input.
Compliance Information
RoHS compliant per TI product page; lead-free (NOPB suffix). Not AEC-Q100 qualified - select TPS92515-Q1 or LM3404HVQ1 variants for automotive designs.
