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AAT3193 Datasheet Preview

AAT3193 Datasheet

(AAT3192 / AAT3193) 2-/3-Channel Charge-Pump LED Drivers

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General Description
The AAT3192 and AAT3193 are charge-pump
based, current-sink white LED drivers capable of
driving one to three LEDs up to 30mA, each. They
automatically switch between 1x mode and 2x
mode to maintain the highest efficiency and opti-
mal LED current accuracy and matching.
The AAT3192/93 charge pump’s 1x mode (bypass
mode) has very low resistance allowing LED cur-
rent regulation to be maintained with input supply
voltage approaching the LED forward voltage.
The AAT3192 and the AAT3193 are available in a
2x2mm 10-lead SC70JW-10 packages.
AAT3192/93
Low-Cost, 2-/3-Channel
Charge-Pump LED Drivers
Features
ChargePump
• Drives up to 3 LEDs at up to 30mA, each
• Automatic Switching Between 1x and 2x Modes
• 0.9MHz Switching Frequency
• Linear LED Output Current Control
— Single-wire, S2Cwire Interface
• AAT3192/93-1: 16-step
• AAT3192/93-2: 8-step
• AAT3192/93-3: 4-step
— ON/OFF or PWM Interface
• AAT3192/93-4
• ±10% LED Output Current Accuracy
• ±3% LED Output Current Matching
• Low-current Shutdown Mode
• Built-in Thermal Protection
• Automatic Soft-start
• Available in 2x2mm SC70JW-10 Package
www.DataSheet4U.com
Typical Application
Applications
• Low-cost Cordless Phone Handsets
• Low-cost Digital Cameras
• Low-cost Mobile Phone Handsets
• Low-cost MP3 and PMP Players
Input Voltage
2.7V to 5.5V
CIN
1μF
EN/SET
S2Cwire
Interface
CP
1μF
RSET
14.3kΩ
IN
OUT
C+
AAT 3192- 1
C-
EN/SET
RSET
GND
D1
D2
C OUT
1μF
Input Voltage
2.7V to 5.5V
WLEDs
OSRAM LW M 678
or equivalent
C IN
1μF
EN/SET
S2Cwire
Interface
CP
1μF
R SET
14.3kΩ
IN
C+ OUT
AAT 3193 -1
C-
EN/SET
D1
D2
RSET
D3
GND
COUT
1μF
WLEDs
OSRAM LW M 678
or equivalent
3193.2007.05.1.0
1




AAT

AAT3193 Datasheet Preview

AAT3193 Datasheet

(AAT3192 / AAT3193) 2-/3-Channel Charge-Pump LED Drivers

No Preview Available !

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


Part Number AAT3193
Description (AAT3192 / AAT3193) 2-/3-Channel Charge-Pump LED Drivers
Maker AAT
PDF Download

AAT3193 Datasheet PDF





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