SC653ULTRT vs LP3944ISQX/NOPB
| Part Number |
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| Category | PMIC - LED Drivers | PMIC - LED Drivers |
| Manufacturer | Semtech Corporation | Texas Instruments |
| Description | IC LED DRIVER RGLTR 25MA 18MLPQ | IC LED DRIVER PS DIM 25MA 24WQFN |
| Package | Tape & Reel (TR) | -Reel® |
| Series | SemPulse® | - |
| Type | DC DC Regulator | Power Switch |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 18-UFQFN Exposed Pad | 24-WFQFN Exposed Pad |
| Supplier Device Package | 18-MLPQ-UT (2.3x2.3) | 24-WQFN (4x4) |
| Topology | Switched Capacitor (Charge Pump) | Shift Register |
| Applications | Backlight | Camera Flash |
| Number of Outputs | 4 | 8 |
| Voltage - Output | 2.5V ~ 5.25V | - |
| Frequency | 250kHz | - |
| Current - Output / Channel | 25mA | 25mA |
| Internal Switch(s) | Yes | Yes |
| Dimming | - | I²C, SMBus |
| Voltage - Supply (Max) | 5.5V | 5.5V |
| Voltage - Supply (Min) | 2.9V | 2.3V |
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1. What is an LED driver for?
The main role of LED drivers is to provide a stable operating current for LEDs. Since LEDs are very sensitive to current, too high a current can cause them to be damaged or their lifespan to be shortened, while too low a current cannot guarantee brightness. Therefore, a suitable driver can ensure that the LED works under safe and efficient conditions.
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2. Is an LED driver just a power supply?
Not exactly. Although the LED driver does provide power, it is more than just a simple power converter. It also contains complex circuits to accurately control the output voltage and current, and sometimes includes dimming, temperature protection and other functions.
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3. Why do I need to program an LED driver?
Programming is usually for advanced drivers with programmable functions, such as achieving finer dimming control, color adjustment or other intelligent functions. This allows users to customize the behavior of the driver according to specific needs.
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4. Can I use an LED light without a driver?
As mentioned before, in theory yes, but in practice it is strongly recommended to use a proper driver to ensure optimal performance and extend life.
