AL8860WT-7 - 40V 1.5A Buck LED Driver | Diodes Incorporated
Teilenummer: AL8860WT-7 ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $0.5 | $0,50 |
| 10 | $0.42 | $4,20 |
| 100 | $0.34 | $34,00 |
| 500 | $0.28 | $140,00 |
| 1.000 | $0.23 | $230,00 |
| 3.000 | $0.18 | $540,00 |
AL8860WT-7 Übersicht
A buck LED driver is a switch-mode DC-DC converter topology that steps down a higher DC input voltage to a lower voltage while regulating the current through an LED string. Constant-current regulation is critical for LED brightness consistency, color stability, and lifetime because LED luminous flux is highly sensitive to forward current. The AL8860 uses a hysteresis (continuous-conduction) control scheme with an integrated 40V MOSFET switch, eliminating the need for an external power transistor and simplifying BOM cost and PCB area in lighting designs.
Key features include a 4.5V to 40V wide input voltage range, an internal 40V power switch, an external sense resistor for setting LED current, integrated PWM dimming input, and analog dimming support via the CTRL pin. The device operates with high efficiency (typically >90%) across the load range thanks to its low-RDS(on) internal switch and minimal quiescent current. Hysteretic control provides excellent transient response and inherently stable operation without external compensation components.
Architecturally, the AL8860 combines a bandgap reference, hysteresis comparator, gate driver, and 40V N-channel MOSFET in a single die. The sense resistor between the switch source and ground sets the peak inductor current threshold, while the CTRL/ADJ pin accepts either a PWM signal for digital dimming or a DC voltage for analog dimming down to near-zero current. The high-side drive and small TSOT-25 footprint allow compact PCB layouts in space-constrained fixtures.
Typical applications include MR16/GU10 LED retrofit lamps, automotive interior and exterior lighting, signage and architectural LED strips, low-voltage industrial LED fixtures, and battery-powered portable illumination. It is also suitable for general-purpose constant-current sinks in 12V/24V LED systems.
When designing with the AL8860WT-7, select the inductor value to maintain continuous conduction at the minimum LED current and verify that the input capacitor handles the ripple current at 1 MHz. Place the sense resistor as close as possible to the SOURCE pin and ground to minimize parasitic inductance that could disturb the hysteresis comparator.
This page synthesizes distributor pricing, parametric cross-references, and practical design notes not found in the manufacturer datasheet alone, helping engineers select the right buck LED driver and identify drop-in equivalents.
Drop-in-Alternativen für AL8860WT-7 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
AL8860WT-7
✅ Drop-In✓ Auf Lager
$0.18 / Stück
Datenblatt ansehen →AL8860WT-7 Grenzwerte & elektrische Eigenschaften
| Topologie | Step-Down (Buck) LED Driver |
| Eingangsspannungsbereich | 4.5 V to 40 V |
| Maximum Output Current (TSOT-25) | 1 A |
| Maximum Output Current (MSOP-8EP variant) | 1.5 A |
| Internal Switch Voltage Rating | 40 V |
| Schaltfrequenz | Up to 1 MHz |
| Control Method | Hysteresis (Continuous Conduction) |
| Dimming | PWM and Analog |
| Anzahl der Ausgänge | 1 |
| Gehäuse | TSOT-25 (5-pin) |
| Montageart | Surface Mount |
| Betriebstemperaturbereich | -40 C to +85 C (industrial) |
| MSL-Level | MSL1 (per JEDEC J-STD-020) |
| RoHS-Status | Compliant |
| LED Driver Type | DC-DC Regulator, Inductive |
AL8860WT-7 Pin-Konfiguration
| Pin 1 | SW — Switch output - internal MOSFET drain, connect to inductor |
| Pin 2 | GND — Ground return for internal circuitry and sense resistor |
| Pin 3 | SET — Current sense input - connect external resistor to GND to set LED current |
| Pin 4 | CTRL/ADJ — Dimming control input - PWM or analog DC voltage for LED current adjustment |
| Pin 5 | VIN — Supply voltage input (4.5V to 40V) - decouple with 1uF ceramic capacitor to GND |
Typische Anwendungen
AL8860WT-7 ist geeignet für 6 Anwendungs: MR16/GU10 LED Retrofit Lamps, Automotive Interior and Exterior Lighting, Architectural and Signage LED Strips, Low-Voltage Industrial LED Fixtures, Battery-Powered Portable LED Lighting, Status Indicators and Channel Letters.
MR16/GU10 LED Retrofit Lamps
The AL8860WT-7 is a near-ideal driver for MR16 and GU10 LED retrofit lamps operating from 12V AC or DC inputs. Its 4.5-40V input range easily handles rectified 12V AC rails, and the 1 MHz switching frequency enables inductor values below 10 uH, allowing a total driver footprint under 50 mm². The integrated 40V switch and external sense resistor allow precise LED current programming, while PWM dimming down to <1% duty cycle preserves the smooth dimming curve required by residential lighting standards such as NEMA SSL 7A. Compared to linear regulators, the buck topology maintains >90% efficiency across the dimming range, keeping the MR16 lamp within its thermal envelope.
Empfohlen
Automotive Interior and Exterior Lighting
In automotive LED lighting - including daytime running lights, turn signals, brake lights, and interior dome/map lamps - the AL8860WT-7's 40V input tolerance easily rejects 12V/24V load-dump transients per ISO 7637-2. Its -40C to +85C operating range suits under-hood and exterior lamp environments, while PWM dimming up to several kHz supports turn-signal and DRL flicker-free operation. The TSOT-25 package is small enough for in-lamp PCB integration, and the hysteretic control provides instant transient response to cold-crank and start-stop voltage dips. Designers should add a TVS diode on VIN for full automotive surge compliance.
Empfohlen
Architectural and Signage LED Strips
Architectural cove lighting, accent strips, and signage channels typically run from 24V constant-voltage power supplies. The AL8860WT-7's 40V maximum input comfortably accepts 24V rails with headroom for transients, while its buck topology regulates constant LED current regardless of string voltage. This ensures uniform brightness across long LED runs where voltage drop would otherwise dim the far end. PWM dimming at 200-1000 Hz is flicker-free for camera recording, supporting broadcast and live-event applications. The 1 MHz switching allows compact inductors that fit within slim aluminum channels, and the TSOT-25 footprint enables driver-on-strip PCB designs.
Empfohlen
Low-Voltage Industrial LED Fixtures
Industrial machine-vision lights, panel indicators, and 24V industrial LED fixtures benefit from the AL8860WT-7's wide input range and high efficiency. The 4.5-40V VIN tolerates industrial 24V buses (per IEC 61131-2 nominal 24V with ±25% tolerance) and the 40V switch handles inductive-load transients on the supply rail. The TSOT-25 package is suitable for sealed IP67 fixture housings where PCB size is constrained, and the integrated switch eliminates the need for an external MOSFET, reducing BOM cost and improving MTBF in vibration-prone industrial environments.
Empfohlen
Battery-Powered Portable LED Lighting
Portable flashlights, headlamps, and emergency lighting running from 1-4 cell Li-ion or 6-12V lead-acid batteries benefit from the AL8860WT-7's high efficiency and PWM dimming capability. The buck topology draws current proportional to LED power (not VIN), extending battery runtime by 30-50% versus linear current regulators. Low-battery cutoff is easily implemented by pulling the CTRL pin low when VIN falls below the UVLO threshold. The TSOT-25 package fits within compact flashlight heads, and the high switching frequency keeps the inductor below 10 uH for handheld-form-factor designs.
Empfohlen
Status Indicators and Channel Letters
Channel-letter signage, exit signs, and equipment status indicators use the AL8860WT-7 to drive a constant current through 1-3 series LEDs from a 12V or 24V supply. The TSOT-25 footprint enables placement inside tight channel-letter enclosures, and the integrated 40V switch tolerates long wiring runs where inductive kickback can reach 30-35V. Hysteretic control provides flicker-free illumination even when supply voltage sags under heavy parallel-channel loading. The low BOM count (one IC, one inductor, one sense resistor, two caps) keeps driver costs under $0.30 in volume.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für AL8860WT-7 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | AL8860MP-13 | PT4115B89E | LGS6304X | TPS92200 |
|---|---|---|---|---|---|
| Brand | Diodes Incorporated | Diodes Incorporated | PowTech | Legend Semiconductor | Texas Instruments |
| Package | TSOT-25 (5-pin) | MSOP-8EP (different footprint) | SOT-23-5 (different pinout) | SOT-23-6 (different pinout) | SOT-23-6 (different pinout) |
| Input Voltage Range | 4.5 V to 40 V | 4.5 V to 40 V | 6 V to 30 V | 5 V to 40 V | 4.5 V to 30 V |
| Maximum Output Current | 1 A | 1.5 A | 1.2 A | 1.5 A | 1.5 A |
| Switching Frequency | Up to 1 MHz | Up to 1 MHz | Up to 1 MHz | Up to 1 MHz | Up to 1.2 MHz |
| Dimming | PWM + Analog | PWM + Analog | PWM + Analog | PWM to 100 kHz | PWM + Analog |
| Internal Switch | Yes (40V MOSFET) | Yes (40V MOSFET) | Yes (integrated) | Yes (integrated) | Yes (integrated) |
Wichtigste Unterscheidungsmerkmale
- Wide 4.5-40V input range with integrated 40V switch in TSOT-25 (vs. PT4115B89E)
- 1 MHz switching in a true 5-pin TSOT-25 footprint (vs. TPS92200)
- Hysteretic control provides inherent stability without compensation (vs. LGS6304X)
Designhinweise
Place the input decoupling capacitor (1 uF X7R minimum, 10 V rating or higher) within 2 mm of the VIN pin and route it directly to the GND pin with a short, wide trace. Place the sense resistor between the SET pin and GND with the ground side connected to the IC's GND pin via a Kelvin connection - this minimizes parasitic inductance that can disturb the hysteresis comparator's threshold and cause LED current ripple or subharmonic oscillation.
Estimated: at VIN=24V, VLED=12V (3x white LEDs), and IOUT=1A, the AL8860WT-7 dissipates approximately (24-12) * 1 = 12 W minus switching losses. The TSOT-25 package has theta_JA around 200 C/W on a standard JEDEC 4-layer test board, resulting in ~80 C junction temperature rise above ambient at 0.6 W dissipation. At full 1 A continuous duty, derate VIN to 18V or less to keep junction below 125 C, or migrate to the AL8860MP-13 MSOP-8EP for higher dissipation capability.
Do not exceed the absolute maximum VIN of 40V - load-dump transients on 12V/24V automotive buses can exceed this. Add a 36V TVS diode (e.g., SMAJ36A) on VIN for automotive applications. Do not leave the CTRL/ADJ pin floating - tie it to VIN through a 100 kohm resistor for full-on default operation, or drive it with a clean PWM signal for dimming. Floating CTRL can cause erratic LED current. Ensure the inductor saturation current rating exceeds the peak switch current (set by sense resistor) by at least 30% to avoid saturation-induced current overshoot.
Keep the switching node (SW pin) traces short and minimize the loop area between VIN, the internal MOSFET, the inductor, and the sense resistor. A small SW-node loop reduces EMI radiated emissions and voltage spikes that could exceed the SW pin's 40V rating. Use a ground pour on the bottom layer and stitch vias around the SW node to provide a low-impedance return path for high-frequency switching currents.
Compliance-Informationen
RoHS and REACH compliant per Diodes Incorporated product page. Not AEC-Q100 qualified; for automotive designs consult Diodes Incorporated for Q-Grade variants.
