AAT3192/93
Low-Cost, 2-/3-Channel
Charge-Pump LED Drivers
Pin Descriptions
Symbol
Pin AAT3192 AAT3193 Description
AAT3192: No connection.
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.
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-.
Power source input. Connect IN to the power source, typically the battery. Bypass IN to
5 IN GND with a 1μF or larger ceramic capacitor.
EN/SET
(AAT3192/93-1/
-2/-3)
LED enable and serial control input. EN/SET is the ON/OFF control for the LED and the
S2Cwire digital input for the AAT3192/93-1/-2/-3 to control serially the LED brightness
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
EN/PWM
AAT3192/93-4. Alternatively, a PWM signal from a GPIO or an equivalent signal from a
(AAT3192/93-4) separate controller can be used to control LED output current linearly. A PWM signal, rang-
ing 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 AAT3192/93-1/-2/-4, a 14.3kΩ
7
RSET
resistor sets each full-scale output current to 20mA, maximum. For the AAT3192/93-3, a
10.7kΩ resistor is recommended.
8
GND
Ground. Connect this pin to the system’s ground plane.
9 D2
AAT3192: LED2 Current Sink Input. D2 is the input of LED2 current sink. Connect
LED2’s anode to OUT and its cathode to D2.
D3
AAT3193: LED3 Current Sink Input. D3 is the input of LED3 current sink. Connect
LED3’s anode to OUT and its cathode to D3.
10 D1
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
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)
N/C
OUT
C-
C+
IN
1
2
3
4
5
10 D1
9 D2
8 GND
7 RSET
6 EN/SET
AAT3193
SC70JW-10
(Top View)
D1 1
OUT 2
C- 3
C+ 4
IN 5
10 D2
9 D3
8 GND
7 RSET
6 EN/SET
2 3193.2007.05.1.0
