1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. The maximum allowable power dissipation of any T
A
(ambient temperature) is P
D(max)
= T
J(max)
– T
A
) /
θ
JA
. Exceeding the maximum allowable power
dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
4. Devices are ESD sensitive. Handling precautions recommended. Human body model: 1.5kΩ in series with 100pF.
Conditions
Variation from nominal V
OUT
Min
-2
-3
Typ
Max
+2
+3
Units
%
%
%/V
mV
mV
µA
µA
dB
mA
V
RMS
0.02
I
OUT
= 100μA to 150mA
V
OUT
> = 3.0V; I
OUT
= 150mA
I
OUT
= 100μA to 150mA
V
EN
< 0.2V, T
J
< 85C
f = up to 1kHz; C
OUT
= 2.2μF
V
OUT
= 0V
C
OUT
= 2.2μF, 10Hz to 100kHz
200
6
150
25
0.05
65
300
58
0.3
10
330
40
1.0
550
Logic Low
Logic High
V
EN1/2
> 1.0V
C
OUT
= 2.2µF; 90% of V
OUT
1.2
25
0.01
50
0.2
V
V
mV
1
100
µA
µs
January 2008
4
M9999-010808-A
Micrel Inc.
WLED Current Sinks
V
IN
= V
DC
(2846) V
END
(2845) = 3.8V, V
EN1
= V
EN2
= 0V; R
SET
= 20.5kΩ; V
DROP
= 0.6V;
T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
125°C; unless noted.
Parameter
Current Accuracy
(5)
Matching
(6)
Drop-out
Ground/Supply Bias Current
Shutdown Current
(current source leakage)
MIC2845- PWM Dimming
Enable Input Voltage V
END
Enable Input Current
Minimum Pulse Width
Current Source Delay
(50% levels)
Shutdown to on
Standby to on; V
DROP
= 0.1V
Standby to on; V
DROP
= 0.6V
On to Standby; V
DROP
= 0.1V
On to Standby; V
DROP
= 0.6V
R
SET
= 20.5k
T
RISE
, V
DROP
= 0.1V
T
RISE
, V
DROP
= 0.6V
T
FALL
; V
DROP
= 0.1V
T
FALL
, V
DROP
= 0.6V
V
END
= 0V
Logic Low
Logic High
VDC Enable Input Current
t
SHUTDOWN
t
MODE_UP
t
MODE_DOWN
t
PROG_HIGH
, t
PROG_LOW
t
DELAY
t
PROG_SETUP
t
START_UP
Notes:
5. As determined by average current of all channels in use and all channels loaded.
6. The current through each LED meet the stated limits from the average current of all LEDs.
(5)
MIC2845/46
Conditions
V
DROPNOM
= 0.6V
V
DROPNOM
= 0.6V
Where I
LED
= 90% of LED current seen at
V
DROPNOM
= 0.6V, 100% brightness level
I
OUT
= 20mA
V
END
= 0V or V
DC
= 0V > 1260µs, V
ENLDO1,2
= 0V
Min
-5
-3.6
-5.5
Typ
Max
+5
+3.6
+5.5
Units
%
%
%
mV
mA
50
1.0
0.01
100
1
µA
Logic Low
Logic High
V
IH
> 1.0V
1.2
0.01
10
125
1
0.5
1
1
1
1
0.3
0.3
20
TBD
0.2
1
V
V
µA
µs
µs
µs
µs
µs
µs
µs
µs
µs
µs
Current Source Transient Time
(10%-90%)
Stand-by to shutdown time
MIC2846- Digital Dimming
V
DC
Input Voltage V
DC
40
0.2
ms
V
V
µA
µs
µs
µs
µs
µs
1.2
0.01
1260
100
420
1
140
35
140
50
160
500
32
1
V
IH
> 1.2V
Time DC pin is low to put into shutdown
Time DC pin is low to change to Count Up Mode
Time DC pin is low to change to Count Down Mode
Time for valid edge count; Ignored if outside limit range
Time DC pin must remain high before a mode change
can occur
First down edge must occur in this window during
presetting brightness
Delay from DC is high to start up
µs
µs
7. Maximum differential in forward voltage anticipated from the LED with the highest forward voltage to the LED with the lowest forward voltage at
nominal current.
8. Current accuracy guaranteed for V
DROP
current source 100mV to V
IN
-1.2V.
9. Dropout voltage is defined as the input-output differential at which the output voltage drops 2% below its nominal value measured at 1V differential.
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