Part Number: AL8860WT-7

Manufacturer: Diodes Incorporated

Description: LED Lighting Drivers LED MV Int Switch

Shipped from: Shenzhen/HK Warehouse

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The AL8860WT-7 is an IC LED DRVR RGLTR PWM 1A TSOT25 with an operating temperature range of 40–125 degrees Celsius and an operating voltage range of 4.5–40 volts. The output current of this integrated circuit is 1.5 A.

AL8860WT-7 Features and Specifications

Category Integrated Circuits (ICs)

Power Management (PMIC)

LED Drivers

Mfr Diodes Incorporated
Package Tape & Reel (TR)

Cut Tape (CT)


Product Status Active
Type DC-DC Regulator
Topology Step-Down (Buck)
Internal Switch(s) Yes
Number of Outputs 1
Voltage – Supply (Min) 4.5V
Voltage – Supply (Max) 40V
Voltage – Output 36V
Current – Output / Channel 1A
Frequency 1MHz
Dimming Analog, PWM
Applications Lighting, Signage
Operating Temperature -40°C ~ 105°C (TA)
Mounting Type Surface Mount
Package / Case SOT-23-5 Thin, TSOT-23-5
Supplier Device Package TSOT-25
Base Product Number AL8860

How to choose LED Driver IC?

Regarding the backlighting of portable devices, LED has firmly established itself as the industry standard. Even the illumination for large LCD panels has begun to challenge conventional CCFL technology. When it comes to lighting, LED is very popular on the market due to its highlighted advantages such as energy efficiency, friendliness toward the environment, extended lifetime, and little maintenance. The driver circuit is an essential and fundamental component of the light-emitting diode (LED). Whether for lighting, backlighting, or the display panel, the choice of the technical design of the driver circuit needs to correspond to the particular applications being used.

The following explains how the LED lighting mechanism works: when the forward voltage is provided to both ends, the minority carrier and the majority carrier in the semiconductor recombine to liberate surplus energy, which results in the emission of photons. The LED drive circuit’s primary jobs are to convert the alternating current voltage into a continuous power source and to adjust the voltage and current levels to be compatible with the LED devices’ specifications. There is a necessity for safety, but there are also two other necessities for the LED driver circuit.

A constant current should be maintained for as long as possible. By doing so, the output current fluctuation can be kept within the range of 10%, which is especially important when the power supply change is greater than 15%range. When using LED as the monitor, other lighting devices, or for backlighting, the following are some of the reasons why it is essential to have a constant current driver:

  • To avoid the drive current reaching a rate higher than the maximum allowed and further compromising its dependability.
  • To guarantee that each LED is consistent in terms of its hue and brightness, to satisfy the requirements for the desired level of brilliance.
  • Second, the driver circuit should have a low overall power consumption to maintain the high efficiency of the LED system.

PWM, which stands for “pulse width modification,” is a tried-and-true method for altering the amount of light. This technique employs short digital pulses to regularly turn the LED driver on and off. It is sufficient for the system to provide both wide and narrow digital pulses for the output to be easily modified to modify the LED brightness. One of the benefits of this technology is that it can provide high-quality white light while also maximizing energy efficiency and being simple to put into practice. However, there is a significant drawback, which is that it is prone to EMI (electromagnetic interference), and it may even make audible noises at times.

One of the many responsibilities of the LED driver circuit is voltage boost, which may be further broken down into inductor-based voltage boost and charge bump, two separate topological modes. Since the LED is powered by the current, and the inductor is at its most efficient point during the transfer of current, the biggest strength of voltage boost via the inductor lies in its high efficiency, which can exceed 90% if the design is done correctly.

However, its weakness is just as notable, and that is its significant EMI, which places high requirements on telecommunication systems such as mobile phones. This is a notable drawback of the technology. Since the invention of charge pumps, most mobile devices no longer increase voltage via an inductor. Increasing the voltage using the charge pump is, without a doubt, lower than the efficiency of increasing the voltage using the alternative method.

The product designer must tackle the problem of increasing the driver transfer efficiency regardless of whether the application is for front or back illumination. Improving the transfer efficiency is helpful for portable products to lengthen their standby duration and is also a vital method of finding a solution to the problem of LED heat dissipation. The utilization of high-power LEDs in the lighting industry brings to light the issue of improving the efficiency of the transfer of light.

To function correctly, LED requires components that stabilize the current and voltage. These components should have a high divided voltage and low power consumption. If this isn’t the case, the highly efficient LED’s high working consumption will reduce the total system efficiency, which goes against the principle of energy saving and high efficiency. To guarantee the high efficiency of the LED system, the primary current limiting circuit should not employ a resistor or a series voltage stabilizing circuit. Instead, it should use highly efficient circuits such as capacitance, inductors, or switching circuits with power supplies.

The LED light output can be maintained at a constant level across a wide range of power supplies by using the series constant power output circuit; however, the efficiency of regular IC circuits will be reduced. Using a switching circuit with a power supply makes it possible to guarantee a steady power output while maintaining a high level of transfer efficiency, even when the power source undergoes significant voltage changes.

Even though LED lights can work effectively under safety extra low voltage (SELV), for example, underwater lights in swimming pools or paddling pools, and mining lamps, LED technology is currently a long way from completely replacing three-band fluorescent lamps due to its low luminous efficacy.

In addition, LEDs offer several distinct benefits when it comes to utilizing other sources of power, such as solar energy, wind energy, or emergency lights. In particular, regarding light adjusting, Besides achieving a whole range of brightness, from 0% to 100%, LED also keeps its high efficacy throughout the entire adjusting process without causing any damage to its durability. This is difficult to achieve with gas discharge lights.


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