AAT1274

1.5A Single Flash LED Driver IC

DATA SHEET

2

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201981A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 21, 2012

Pin Descriptions

Pin # Symbol Description

1,5

AGND

Analog ground pin. Connect AGND to PGND, and FLGND at a single point as close to the AAT1274 as possible.

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) select the Flash-to-Movie-mode ratio;

3

FL

LED Flash current sink pin. Connect the cathode of Flash LED to FL.

4

FLEN

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

6IN

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 AAT1274 package for optimum per-

formance.

7

PGND

Power ground. Connect PGND to the same single point as AGND located as close to the AAT1274 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 AAT1274. Connect OUT to the anode of the Flash LED.

9, 12

NC

Not connected

10

SW

Boost converter switching node. Connect a 1μH inductor between SW and IN.

11

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 FL sink current to the maximum (default) movie-mode current level.

13

FLGND

Flash ground pin. Connect FLGND to PGND, and AGND at a single point as close to the AAT1274 as possible.

14

RSET

Flash current set pin. Connect a resistor from RSET to AGND to program the desired flash current for the cur-

rent sink FL.

EP

Electrical back contact. Connect to a good thermal ground pad

Pin Configuration

TDFN33-14

(Top View)

AGND

EN/SET

FL

1

FLEN

AGND

IN

RSET

FLGND

N/C

FLINH

SW

N/C

2

3

4

5

6

12

11

14

13

10

9

OUT

8