MIC2846A Datasheet, PDF (4/19 Pages) Micrel Semiconductor – High Efficiency 6 Channel Linear WLED Driver with DAM™, Digital Control and Dual Low IQ LDOs

Micrel Inc.
Absolute Maximum Ratings⁽¹⁾
Main Input Voltage (V_IN) ................................... -0.3V to +6V
Enable Input Voltage (V_DC, V_EN1, V_EN2) ............ -0.3V to +6V
LED Driver Voltage (V_D1-D6).............................. -0.3V to +6V
Power Dissipation ................................. Internally Limited⁽³⁾
Lead Temperature (soldering, 10sec.)....................... 260°C
Storage Temperature (T_s) ..........................-65°C to +150°C
ESD Rating⁽⁴⁾................................................. ESD Sensitive
MIC2846A
Operating Ratings⁽²⁾
Supply Voltage (V_IN).................................. +3.0V to +5.5V
Enable Input Voltage (V_DC, V_EN1, V_EN2) .............. 0V to V_IN
LED Driver Voltage (V_D1-6) ................................. 0V to V_IN
Junction Temperature (T_J) .....................–40°C to +125°C
Junction Thermal Resistance
2.5mm x 2.5mm Thin MLF-14L (θ_JA) ..............89°C/W
Electrical Characteristics
Linear WLED Drivers
V_IN = V_DC = 3.8V, V_EN1 = V_EN2 = 0V, R_SET = 20.5kΩ; V_D1-D6 = 0.6V; T_J = 25°C, bold values indicate –40°C ≤ T_J ≤ 125°C;
unless noted.
Parameter
Current Accuracy⁽⁵⁾
Matching⁽⁶⁾
Conditions
Min
Typ
Max Units
1.5
%
1.5
%
Drop-out
Ground/Supply Bias Current
Shutdown Current
(current source leakage)
Where I_LED = 90% of LED current seen at
V_DROPNOM = 0.6V, 100% brightness level
I_LED = 20mA
V_DC = 0V for more than 1260µs
40
80
mV
1.4
1.8
mA
0.01
1
µA
Digital Dimming
V_DC Input Voltage (V_DC)
V_DC 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}
Logic Low
0.2
V
Logic High
1.2
V
V_DC = 1.2V
Time DC pin is low to shutdown the device
0.01
1
µA
1260
µs
Time DC pin is low to change to Count Up Mode
100
160
µs
Time DC pin is low to change to Count Down Mode
420
500
µs
Time for valid edge count; Ignored if outside limit range
2
32
µs
Time DC pin must remain high before a mode change
can occur
100
µs
First down edge must occur in this window during
presetting brightness
5
75
µs
Delay time starting when DC is first pulled high until
LEDs start up
140
µs
LDOs
V_IN = V_EN1 = V_EN2 = 3.8V, V_DC = 0V; C_OUT1 = C_OUT2 = 1μF, I_OUT1 = I_OUT1 = 100μA; T_J = 25°C, bold values indicate –40°C ≤
T_J ≤125°C; unless noted.
Parameter
Conditions
Min
Typ
Max Units
Output Voltage Accuracy
Variation from nominal V_OUT
-2
+2
%
-3
+3
%
V_IN Line Regulation
Load Regulation
Dropout Voltage⁽⁷⁾
Ground Pin Current
I_OUT = 100μA to 150mA
V_OUT >= 3.0V; I_OUT = 150mA
0.02
0.3
%/V
7
mV
150
330
mV
35
70
µA
Ground Pin Current in Shutdown
V_EN = 0V
0.05
1.0
µA
April 2010
4
M9999-041210-D