AK7864A Datasheet, PDF (8/13 Pages) Asahi Kasei Microsystems – 3 channel LED driver with Charge Pump

[AK7864A]
3. LED driver block analog characteristics
(VDD=3.135~3.465V, Ta=070C unless otherwise specified)
Item
Min. Typ. Max. Unit
Remarks
LED drive current range
22
66
mA (note 1)
The LED protection circuit 105 150 217.5 mA
activation current
LED current
(R/G/B)
LED current accuracy
60
66
72
mA IREF resistor =4.7k±1%
LED pin voltage=2VDD–3.1V
LED pin voltage=2VDD–3.1V
(R/G/B)
CONT_R/G/B
100
%
000
86.0 87.5 89.0
%
001
73.5 75
76.5
%
010
60.5 62.5 64.5
%
011
48
50
52
%
100
35.5 37.5 39.5
%
101
23
25
27
%
110
10.5 12.5 14.5
%
111
LED current
2.5
LED Vf dependency
2.5
% Refer to
LED pin voltage=(2VDD–3.1)V
LED Vf
1.1
4.8
V (note 2)
Current Consumption
1.1
mA Except LED drive current
(note 1) IREF resistance [k] ＝ 66 ÷ [LED drive current [mA]] × 4.7[k]. [LED drive current] is
possible to be set to 22mA ~ 66mA.
(note 2) In order to keep the normal operation at generation of heat of device, when RGB 3ch
simultaneous lighting, the minimum of Vf has restriction.
Example: (when 3ch simultaneous lighting with drive current 33mA, as for the minimum of
Vf, in 1ch 1.1V and the remaining 2ch are 2.0V) When you use simultaneous lighting,
since we can check for you whether LED Vf combination to use of a drive current value
are possible, please contact us.
(note 3) External load: The total line resistance of CPOUT pin ~ LED anode and LED cathode ~
LED_R/G/G pin must be within 2.
(note 4) 50% setting is an upper bound when all channels turn on at the same time.
MS1336 - E - 00
8
2012/01