AAT2860

Backlight/Flash LED Driver and Multiple LDO Lighting Management Unit

ChargePump

TM

PRODUCT DATASHEET

2

2860.2008.05.1.0

www .analogictech.com

AAT2860

Backlight/Flash LED Driver and Multiple LDO Lighting Management Unit

ChargePump

TM

PRODUCT DATASHEET

2

2860.2008.05.1.0

www .analogictech.com

Pin Descriptions

Pin # Symbol Description

1

OUT

Charge pump output. OUT is the output of the charge pump and supplies current to the backlight and flash

LEDs. Connect the backlight and flash LED anodes to OUT. Bypass OUT to PGND with a 2.2μF or larger ceramic

capacitor as close to the AAT2860-x as possible.

2

C2+

Positive terminal of charge pump capacitor 2. Connect the 1μF charge pump capacitor 2 from C2+ to C2-.

3

SDA

4

SCL

5

LED_SEL

LED Programming Enable Input. When LED_SEL is strobed low-to-high, the backlight and flash LED registers

and flash LED outputs are turned off and the backlight and flash LED registers are reset to their default (power-

on-reset or POR) values.

6

FL_LVL

(AGND)

AAT2860-2/3/4: Flash/Torch enable input. When LED_SEL is strobed high and FL_LVL is strobed high, the flash

LED current outputs are enabled and set according to the contents of the flash LED current register. When

FL_LVL is strobed high-to-low, the flash LED outputs return to their low-level programmed values.

AAT2860-1/5: Connect to AGND.

7

LDO_SEL

Programming enable input for LDO[A, B, C]. When LDO_SEL is strobed low-to-high, the LDO output voltages can

LDO output voltage registers to their default (POR) values and forces all outputs to 0 (zero) volt.

8

AGND

Analog ground. Connect AGND to PGND at a single point as close to the AAT2860-x as possible.

9

LDOC

LDOC regulated voltage output. LDOC is the voltage output of LDOC. Bypass LDOC to AGND with a 2.2μF or

larger ceramic capacitor as close to the AAT2860-x as possible.

10

LDOB

LDOB regulated voltage output. LDOB is the voltage output of LDOB. Bypass LDOB to AGND with a 2.2μF or

larger ceramic capacitor as close to the AAT2860-x as possible.

11

IN

Input power pin for all three LDOs. Connect Pin 11 to Pin 23 with as short a PCB trace as practical. Bypassing

this pin with a separate 4.7µF or larger ceramic capacitor will improve performance.

12

LDOA

LDOA regulated voltage output. LDOA is the voltage output of LDOA. Bypass LDOA to AGND with a 2.2μF or

larger ceramic capacitor as close to the AAT2860-x as possible.

13

BL1

Backlight LED 1 current sink/channel. BL1 controls the current through backlight LED 1. Connect the cathode of

backlight LED 1 to BL1. If not used, connect BL1 to OUT.

14

BL2

Backlight LED 2 current sink/channel. BL2 controls the current through backlight LED 2. Connect the cathode of

backlight LED 2 to BL2. If not used, connect BL2 to OUT.

15

BL3

Backlight LED 3 current sink/channel. BL3 controls the current through backlight LED 3. Connect the cathode of

backlight LED 3 to BL3. If not used, connect BL3 to OUT.

16

BL4

Backlight LED 4 current sink/channel. BL4 controls the current through backlight LED 4. Connect the cathode of

backlight LED 4 to BL4. If not used, connect BL4 to OUT.

17

BL5

Backlight LED 5 current sink/channel. BL5 controls the current through backlight LED 5. Connect the cathode of

backlight LED 5 to BL5. If not used, connect BL5 to OUT.

18

BL6

(FL1)

AAT2860-1/2/3/5/6: Backlight LED 6 current sink/channel. BL6 controls the current through backlight LED 6.

Connect the cathode of backlight LED 6 to BL6. If not used, connect BL6 to OUT.

AAT2860-4: Flash LED 1 current sink. FL1 controls the current through Flash LED 1. Connect the cathode of

Flash LED 1 to FL1. If not used, connect FL1 to OUT.

19

BL7

(FL2)

AAT2860-1/5/6: Backlight LED 7 current sink/channel. BL7 controls the current through backlight LED 7. Con-

nect the cathode of backlight LED 7 to BL7. If not used, connect BL7 to OUT.

AAT2860-2/3/4: Flash LED or Flash LED 2 current sink. FL2 controls the current through Flash LED 2. Connect

the cathode of Flash LED 2 to FL2. If not used, connect FL2 to OUT.

20

PGND

Power ground. Connect PGND to AGND at a single point as close to the AAT2860-x as possible.

21

C2-

Negative terminal of charge pump capacitor 2.

22

C1-

Negative terminal of charge pump capacitor 1.

23

IN

Power input. Connect IN to the input source voltage. Bypass IN to PGND with a 4.7μF or larger ceramic capacitor

as close to the AAT2860-x as possible.

24

C1+

Positive terminal of charge pump capacitor 1. Connect the 1μF charge pump capacitor 1 from C1+ to C1-.

EP

Exposed paddle (bottom) Connect to PGND/AGND as close to the AAT2860-x as possible.