Unknown Manufacturer LM3842
The LM3842 is a step-down constant current LED driver. When the input voltage down to lower than LED forward voltage, then LM3842 run into LDO mode. The LM3842 supports a range of input voltages from 2.5V to 6.0V, allowing the use of a single Li+/Li-polymer cell, 3AA or 4AA cell, USB, and other standard power sources.| Part No. | LM3842 |
|---|---|
| Datasheet | LM3842 Download |
| Manufacturer | Unknown Manufacturer |
| Description | step-down constant current LED driver |
| Buy | Stock & Price |
FEATURES
n n n n n n n n n n n n Efficiency up to 93% 180 μA(TYP.) Quiescent Current Output Current: Up to 1A Internal Synchronous Rectifier 1.5MHz Switching Frequency Soft Start Under-Voltage Lockout Short LED Protection Open LED Protection Thermal Shutdown 5-pin Small SOT23-5 Packages Pb-Free PackageGENERAL DESCRIPTION
The FB voltage is only 0.1V to achieve high efficiency. LM3842 employ internal power switch and synchronous rectifier to minimize external part count and realize high efficiency. During shutdown, the input is disconnected from the output and the shutdown current is less than 1 μA. Other key features include under-voltage lockout to prevent deep battery discharge of the Li+ battery. .APPLICATIONS
n 3AA or 4AA Batteries Powered Flashlight n 1 Cell Li-Ion Battery Powered Flashlight Typical Application 1 Cell Li-Ion Battery 3AA or 4AA Batteries V IN VIN GND SW L 4.7 µH C IN 10µF 1~5W WLED FB Co 10µF EN Rs ILED =0.1/Rs 1 10/2010 datasheet pdf - LM3842 Block Diagram + IAMP...
