PRODUCT DATASHEET
AAT3195
ChargePump
TM
4-Channel Charge-Pump LED Driver
Pin Descriptions
Pin #
1
2
3
4
5
Symbol
D2
D1
OUT
C+
IN
EN/SET
(AAT3195-1/-2)
Description
LED2 Current Sink Input. D2 is the input of LED2 current sink. Connect LED2’s anode to OUT and its
cathode to D2.
LED1 Current Sink Input. D1 is the input of LED1 current sink. Connect LED1’s anode to OUT and its
cathode to D1.
Charge Pump Output. OUT is the output of the charge pump. Bypass OUT to AGND with a 1μF or
larger ceramic capacitor.
Charge Pump Capacitor Positive Node. Connect a 1μF ceramic capacitor between C+ and C-.
Power source input. Connect IN to the power source, typically the battery. Bypass IN to AGND with
a 1μF or larger ceramic capacitor.
LED Enable and serial control input. EN/SET is the ON/OFF control for the LED and the S
2
Cwire
digital input for the AAT3195-1/-2 to control serially the LED brightness according to the maximum
current set by R
SET
.
LED ON/OFF and PWM control input. This logic input controls the LED outputs for the AAT3195-3.
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.
Charge Pump Capacitor Negative Node.
Analog Ground. Connect this pin to the system’s analog ground plane.
LED4 Current Sink Input. D4 is the input of LED4 current sink. Connect LED4’s anode to OUT and its
cathode to D4.
LED3 Current Sink Input. D3 is the input of LED3 current sink. Connect LED3’s anode to OUT and its
cathode to D3.
6
EN/PWM
(AAT3195-3)
7
8
9
10
C-
AGND
D4
D3
Pin Configuration
SC70JW-10
(Top View)
D2
D1
OUT
C+
IN
1
2
3
4
5
10
9
8
7
6
D3
D4
AGND
C-
EN/SET (EN/PWM)
2
www.analogictech.com
3195.2008.09.1.0
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
