The main reason for my quest is curiosity. I am helping a friend learn circuit analysis and this chip turned up. It's clearly labeled and it's used in a mass market inexpensive unit, but I cannot find any documentation for it.
What's driving me crazy is the part about "cannot find any documentation".
I have no question what the thing does in this device. It monitors a pushbutton switch and produces an output signal that toggles between continuous low, continuous high, and roughly 30% duty cycle square wave. That output signal is then used to control a MOSFET that switches the LEDs off, on, or dim via PWM. The chip is used as a four-pin device: power, ground, switch in, MOSFET out. It manages to produce roughly 207 Hz PWM without the aid of external components.
But searching the web failed utterly to find any information about this chip.
For context, this is found in the unit sold by Walmart as their "Hyper Tough 300 Lumen Pivoting Work Light, LED".
Following is an overview of the circuit board. The chip in question is at lower left, oriented vertically in this image. The two components next to it are a diode and a 7.4 µF capacitor that help to isolate the control chip from voltage fluctuations caused by the flashing of the LEDs.
Clearly I'm missing something about how to look for documentation. Help??
--Rik