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AAT1271AIWO-T1 Datasheet(PDF) 2 Page - Advanced Analogic Technologies |
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AAT1271AIWO-T1 Datasheet(HTML) 2 Page - Advanced Analogic Technologies |
2 / 19 page AAT1271A 1.5A Step-Up Current Regulator for Flash LEDs SwitchRegTM PROPRIETARY INFORMATION PRODUCT DATASHEET 2 1271A.2008.07.1.0 www .analogictech.com AAT1271A 1.5A Step-Up Current Regulator for Flash LEDs SwitchRegTM PROPRIETARY INFORMATION PRODUCT DATASHEET 2 1271A.2008.07.1.0 www .analogictech.com Typical Application AAT1271A RSET 107kΩ V BAT CIN 2.2μF CT L1 1μH IN SW OUT FLOUTA CT EN/SET FLINH RSET AGND PGND FLEN Movie-mode Enable and Set Flash Enable Flash Inhibit FLOUTB FLGND COUT 2.2μF GND High Current Flash LEDs Pin Descriptions Pin # Symbol Function 1CT 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. 2 EN/SET 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) select FLOUTA and FLOUTB’s output configuration. 3 FLEN Flash enable pin. A low-to-high transition on the FLEN pin initiates a flash pulse and starts the flash timer. 4 AGND Analog ground pin. Connect AGND to PGND, GND, and FLGND at a single point as close to the AAT1271A as possible. 5IN Power input. Connect IN to the input power supply voltage. Connect a 2.2μF or larger ceramic capacitor from IN to PGND as close as possible to the AAT1271A 6 SW Boost converter switching node. Connect a 1μH inductor between SW and IN. 7 PGND Power ground pin. Connect PGND to AGND, GND, and FLGND at a single point as close to the AAT1271A as possible. 8 OUT Power output of the boost converter. Connect a 2.2μF or larger ceramic capacitor from OUT to PGND as close as possible to the AAT1271A. Connect OUT to the anode(s) of the Flash LED(s). 9 GND Ground pin. Connect GND to PGND, AGND, and FLGND at a single point as close to the AAT1271A as pos- sible. 10 FLINH 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 FLOUTA and FLOUTB output currents 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. 11 FLOUTB Flash Output B. Connect cathode of Flash LEDB to FLOUTB. For a single flash LED, connect FLOUTB & FLOUTA together. For two flash LEDs, each output will conduct 50% of the total flash output current. 12 FLGND Flash ground pin. Connect FLGND to PGND, GND, and AGND at a single point as close to the AAT1271A as possible 13 FLOUTA Flash Output A. Connect cathode of Flash LEDA to FLOUTA. For a single flash LED, connect FLOUTA and FLOUTB together. For two flash LEDs, each output will conduct 50% of the total flash output current. 14 RSET Flash current setting input. A 107kΩ resistor from RSET to AGND sets the maximum flash current avail- able at FLOUTA and FLOUTB to 1.5A. Each FLOUTA and FLOUTB channel will conduct 50% of the maximum programmed current. The AAT1271A’s flash-to-movie-mode ratio is fixed at 7.3:1. EP Exposed paddle (bottom); Connect EP to PGND as close as possible to the AAT1271A. |
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