3. TECHNICAL BRIEF
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Only for training and service purposes
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The AAT3192 is a charge-pump based, current-sink white LED driver capable of driving one or two LEDs
up to 30mA, each. It automatically switches between 1x mode and 2x mode to maintain the highest
efficiency and optimal LED current accuracy and matching. The AAT3192 charge pump’s 1x mode (bypass
mode) has very low resistance allowing LED current regulation to be maintained with input supply
voltage approaching the LED forward voltage. The AAT3192 is available in the 2x2mm, 10-lead SC70JW-
10 package.
• Drives up to 2 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
• AAT3192-1: 16-step
•
·
10% LED Output Current Accuracy
•
·
3% LED Output Current Matching
• Low-Current Shutdown Mode
• Built-in Thermal Protection
Figure 3.8.2. AAT3192 CIRCUIT DIAGRAM
3. TECHNICAL BRIEF
R347
15K
VBAT
C348
1u
U304
1
7
2
6
10
9
4
8
3
5
IN
C-
GND
C+
D2
D1
EN_SET
OUT
RSET
NC
C344
1u
R348
4.7K
W_LED_DRV1
MLED2
MLED1
MLED
(for LCD)
(15K ohm,1/16W,F,1005)
2CH LED DRIVER