PRODUCT DATASHEET
AAT3193
ChargePump
TM
3-Channel Charge-Pump LED Driver
Pin Descriptions
Pin
1
2
3
4
5
Symbol
D1
OUT
C-
C+
IN
EN/SET
(AAT3193-1/-2/-3)
Description
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 GND with a 1μF or
larger ceramic capacitor.
Charge pump capacitor negative node.
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 GND 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 AAT3193-1/-2/-3 to control serially the LED brightness according to the maximum cur-
rent set by R
SET
.
LED ON/OFF and PWM control input. This logic input controls the LED outputs for the AAT3193-4.
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.
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 AAT3193-1/-2/-4, a 14.3kΩ resistor sets each full-scale
output current to 20mA, maximum. For the AAT3193-3, a 11.5kΩ resistor is recommended.
Ground. Connect this pin to the system’s ground plane.
LED3 Current Sink Input. D3 is the input of LED3 current sink. Connect LED3’s anode to OUT and its
cathode to D3.
LED2 Current Sink Input. D2 is the input of LED2 current sink. Connect LED2’s anode to OUT and its
cathode to D2.
6
EN/PWM
(AAT3193-4)
7
8
9
10
RSET
GND
D3
D2
Pin Configuration
SC70JW-10
(Top View)
D1
OUT
C-
C+
IN
1
2
3
4
5
10
9
8
7
6
D2
D3
GND
RSET
EN/SET
2
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3193.2008.07.1.3
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