AAT3192/93
Low-Cost, 2-/3-Channel
Charge-Pump LED Drivers
Pin Descriptions
Symbol
Pin
Description
AAT3192: No connection.
AAT3192
AAT3193
1
N/C
D1
AAT3193: 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-.
2
3
4
OUT
C-
C+
Power source input. Connect IN to the power source, typically the battery. Bypass IN to
GND with a 1μF or larger ceramic capacitor.
5
IN
LED enable and serial control input. EN/SET is the ON/OFF control for the LED and the
S Cwire digital input for the AAT3192/93-1/-2/-3 to control serially the LED brightness
EN/SET
(AAT3192/93-1/
-2/-3)
2
according to the maximum current set by RSET
.
6
LED ON/OFF and PWM control input. This logic input controls the LED outputs for the
AAT3192/93-4. 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, rang-
ing from 10ꢀ to 100ꢀ duty cycle, controls the LED current linearly between ZS and FS.
EN/PWM
(AAT3192/93-4)
A 1ꢀ tolerance resistor from this pin to GND sets the maximum LED current level. For
optimal LED output current accuracy and matching in the AAT3192/93-1/-2/-4, a 14.3kΩ
resistor sets each full-scale output current to 20mA, maximum. For the AAT3192/93-3, a
10.7kΩ resistor is recommended.
7
8
9
RSET
GND
Ground. Connect this pin to the system’s ground plane.
AAT3192: LED2 Current Sink Input. D2 is the input of LED2 current sink. Connect
LED2’s anode to OUT and its cathode to D2.
AAT3193: LED3 Current Sink Input. D3 is the input of LED3 current sink. Connect
LED3’s anode to OUT and its cathode to D3.
AAT3192: LED1 Current Sink Input. D1 is the input of LED1 current sink. Connect
LED1’s anode to OUT and its cathode to D1.
D2
D1
D3
D2
10
AAT3193: LED2 Current Sink Input. D2 is the input of LED2 current sink. Connect
LED2’s anode to OUT and its cathode to D2.
Pin Configuration
AAT3192
SC70JW-10
(Top View)
AAT3193
SC70JW-10
(Top View)
10
9
10
9
1
2
3
4
5
1
2
3
4
5
D1
D2
N/C
OUT
C-
D1
OUT
C-
D2
D3
8
8
GND
RSET
EN/SET
GND
RSET
EN/SET
7
7
C+
IN
C+
IN
6
6
2
3193.2007.05.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
