LP3954 Datasheet, PDF (27/60 Pages) National Semiconductor (TI) – Advanced Lighting Management Unit

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LP3954
SNVS340D – JUNE 2005 – REVISED MARCH 2013
External PWM
WLED1-4_pwm
WLED1-4[7:0]
EN_W1-4
&
8-Bit IDAC
WLED1-4
Figure 25. Main Display up to 4 LEDs (WLED1…4)
External PWM
WLED5-6_pwm
WLED5-6[7:0]
EN_W5-6
&
8-Bit IDAC
WLED5-6
Figure 26. Sub Display Driver up to 2 LEDs (WLED5…6)
External PWM
WLED1-4_pwm
WLED1-4[7:0]
EN_W1-4
&
8-Bit IDAC
WLED1-4
Figure 27. Main Display up to 6 LEDs (WLED1…6) (DISPL=1)
BACKLIGHT DRIVER ELECTRICAL CHARACTERISTICS
I_MAX
I_Leakage
I_WLED1
I_Match1-4
I_Match5-6
I_Match1-6
Parameter
Test Conditions
Min
Typical
Max
Unit
Maximum Sink Current
21.3
25.5
29.4
mA
Leakage Current
WLED1 Current tolerance
V_FB =5V
I_WLED1 set to 12.8mA (80H)
0.03
1
µA
10.52
12.8
14.78
mA
-18
+16
%
Sink Current Matching
I_SINK=13mA, Between WLED1…4
0.2
%
Sink Current Matching
I_SINK=13mA, Between WLED5…6
0.2
%
Sink Current Matching
I_SINK=13mA, Between WLED1…6
0.3
%
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