VBATT = 2.7V to 5.5V
Enable /Set Input
1.5A Step-Up Current Regulator for Flash LEDs
PGND AGND FLGND
Flash timer control input. Connect a capacitor between CT and AGND to set maximum duration of the flash
pulse. To disable the flash timer, connect CT to AGND.
Enable and Serial Control input. EN/SET is the AS2Cwire addressing and programming input to: a) adjust
the movie-mode current level; b) program the flash timer based on CT; c) select the Flash-to-Movie-mode
ratio; and d) enable/disable movie mode operation.
Flash enable pin. A low-to-high transition on the FLEN pin initiates a flash pulse and a high-to-low transition
on the FLEN pin terminates a flash pulse.
Analog ground pin. Connect AGND to PGND and FLGND at a single point as close to the AAT1290 as pos-
Flash output boost converter power input. Connect IN to the input power source. Connect a 2.2μF or larger
ceramic capacitor from IN to PGND and locate as close as possible to the IC package for optimum perfor-
Boost converter switching node. Connect a 1µH inductor between SW and IN.
Power ground. Connect PGND to the same single point as AGND located as close to the IC as possible.
Power output of the boost converter. Connect a 2.2µF or larger ceramic capacitor from OUT to PGND as
close as possible to the AAT1290. Connect OUT to the anode of the Flash LED.
Flash inhibit pin. FLINH is an active HIGH control input with an internal 200kΩ resistor to AGND. A low-to-
high transition on the FLINH pin reduces FL sink current to the maximum (default) movie-mode current
level for the duration of FLINH. Strobing the FLINH pin low to high does not reset the flash timer.
Flash ground pin. Connect FLGND to PGND and AGND at a single point as close to the AAT1290 as possible.
LED Flash current sink pin. Connect the cathode of Flash LED to FL.
Flash current setting input. Connect a resistor from RSET to AGND to program the desired flash current for
the current sink FL.
Exposed paddle (bottom); Connect EP to PGND as close as possible to the AAT1290.
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2 202106A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 26, 2012