LM3431AMH Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
LM3431AMH is a 3-channel constant-current PWM LED driver controller from Texas Instruments with current-mode control and 4.5 V to 36 V input range. Drives high-current LED strings for LCD backlighting with independent brightness control per channel. Available from stock worldwide with fast shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 28
- Lifecycle
- OBSOLETE
- Datasheet
- LM3431AMH Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LM3431AMH?
- 3-channel independent current-mode PWM control drives up to 3 separate LED strings simultaneously with matched brightness
- Wide 4.5 V to 36 V input range supports automotive 12 V, industrial 24 V, and 5 V USB-powered display applications
- Fault detection with open/short LED protection and enable pin per channel simplifies diagnostic and safety circuit design
What is LM3431AMH used for?
LM3431AMH is optimized for LCD backlight applications in automotive infotainment displays, industrial HMI panels, and large-screen monitors requiring independent dimming of RGB LED strings. Its current-mode control topology maintains constant LED current even with input voltage variations from 4.5 V to 36 V, ensuring color uniformity across all 3 channels. Medical display equipment and signage controllers also use this driver for stable high-brightness operation across wide temperature ranges.
What are the specifications of LM3431AMH?
| YTEOL | 0 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 36V |
| Input Voltage-Min | 4.5V |
| Input Voltage-Nom | 12V |
| JESD-30 Code | R-PDSO-G28 |
| JESD-609 Code | e0 |
| Number of Functions | 1 |
| Output Current-Max | 0.7A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP28,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, HEAT SINK/SLUG, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Switcher Configuration | SINGLE |
| Switching Frequency-Max | 1100kHz |
| Technology | BICMOS |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | TIN LEAD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 40 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the LM3431AMH datasheet?
LM3431AMH Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for LM3431AMH?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What input voltage range does LM3431AMH support and which power systems can it connect to?
LM3431AMH operates from 4.5 V to 36 V input, covering 5 V USB-powered portable displays, 12 V automotive infotainment systems, and 24 V industrial panel supplies. The nominal 12 V operation is optimized for standard automotive head unit backlights, where supply voltage can sag to 9 V during engine cranking and spike to 36 V during load dump, both safely within the device's input range.
How does the current-mode PWM control in LM3431AMH ensure consistent LED brightness across 3 channels?
LM3431AMH uses cycle-by-cycle current sensing to regulate the peak inductor current independently for each of its 3 channels, maintaining constant LED current regardless of forward voltage variation across LED batches. This current-mode approach limits current mismatch between channels to less than 3%, compared to 10 to 20% mismatch seen in voltage-mode drivers, which is critical for RGB backlight panels where color balance requires per-channel current accuracy within 5%.
Does LM3431AMH include LED fault protection and how does it report faults?
Yes, LM3431AMH includes open-LED and short-LED detection for each of the 3 output channels. When a fault is detected on any string, the corresponding channel shuts down and an FAULT flag output asserts low, which a host MCU can read via a GPIO interrupt. This per-channel fault isolation ensures that a single broken LED string does not shut down the remaining 2 channels, maintaining partial display illumination in safety-critical applications.
What package does LM3431AMH use and how does its 28-pin SOIC footprint compare to smaller alternatives?
LM3431AMH uses a 28-pin SOIC (PDSO-G28) package with 1.27 mm pin pitch and a body measuring approximately 17.9 mm x 7.5 mm. Compared to a 16-pin TSSOP alternative, the wider body provides more PCB copper area around the package for heat spreading, supporting higher total LED drive current without requiring an external heatsink. The 0.3 mm lead coplanarity suits standard reflow soldering at 260°C peak temperature.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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