AAT3192

2-Channel Charge-Pump LED Driver

PRODUCT DATASHEET

2

3192.2008.07.1.3

www .analogictech.com

AAT3192

2-Channel Charge-Pump LED Driver

PRODUCT DATASHEET

2

3192.2008.07.1.3

www .analogictech.com

Pin Descriptions

Pin

Symbol

Description

1

N/C

No connection.

2

OUT

Charge pump output. OUT is the output of the charge pump. Bypass OUT to GND with a 1μF or

larger ceramic capacitor.

3

C-

Charge pump capacitor negative node.

4

C+

Charge pump capacitor positive node. Connect a 1μF ceramic capacitor between C+ and C-.

5IN

Power source input. Connect IN to the power source, typically the battery. Bypass IN to GND with a

1μF or larger ceramic capacitor.

6

EN/SET

(AAT3192-1/-2/-3)

tal input for the AAT3192-1/-2/-3 to control serially the LED brightness according to the maximum

EN/PWM

(AAT3192-4)

LED ON/OFF and PWM control input. This logic input controls the LED outputs for the AAT3192-4.

Alternatively, a PWM signal from a GPIO or an equivalent signal from a separate controller can be

used to control LED output current linearly. A PWM signal, ranging from 10% to 100% duty cycle,

controls the LED current linearly between ZS and FS.

7

RSET

A 1% tolerance resistor from this pin to GND sets the maximum LED current level. For optimal LED

output current accuracy and matching in the AAT3192-1/-2/-4, a 14.3kΩ resistor sets each full-scale

output current to 20mA, maximum. For the AAT3192-3, a 11.5kΩ resistor is recommended.

8

GND

Ground. Connect this pin to the system’s ground plane.

9D2

LED2 Current Sink Input. D2 is the input of LED2 current sink. Connect LED2’s anode to OUT and

its cathode to D2.

10

D1

LED1 Current Sink Input. D1 is the input of LED1 current sink. Connect LED1’s anode to OUT and

its cathode to D1.

Pin Configuration

SC70JW-10

(Top View)

C-

C+

IN

D1

GND

RSET

EN/SET

3

4

56

7

8

OUT

D2

2

9

10