MIC2845A Datasheet, PDF (5/18 Pages) Micrel Semiconductor – High Efficiency 6 Channel Linear WLED Driver with DAM™, Ultra Fast PWM™ Control and Dual Low IQ LDOs

Micrel Inc.
MIC2845A
LDOs
V_IN = V_EN1 = V_EN2 = 3.8V, V_END = 0V, C_OUT1 = C_OUT2 = 1µF, I_OUT1 = I_OUT2 = 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
0.02
0.3
%/V
Load Regulation
Dropout Voltage⁽⁷⁾
I_OUT = 100µA to 150mA
V_OUT ≥ 3.0V, I_OUT = 150mA
7
mV
150
330
mV
Ground Pin Current
35
70
µA
Ground Pin Current in Shutdown V_EN = 0V
Ripple Rejection
f = 1kHz; C_OUT = 2.2µF
0.05
1
µA
65
dB
Current Limit
Output Voltage Noise
Enable Inputs (EN1, EN2)
V_OUT =0V
Frequency 10Hz to 100kHz
175
300
500
mA
200
µV_RMS
Enable Input Voltage
Logic Low
0.2
V
Logic High
1.2
V
Enable Input Current
V_EN1 = V_EN2 = 1.2V
0.01
1
µA
Turn-on Time
C_OUT = 1µF; 90% of V_OUT
50
100
µs
Notes:
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 (150°C).
4. Devices are ESD sensitive. Handling precautions recommended. Human Body Model (HBM), 1.5kΩ in series with 100pF.
5. As determined by average current of all channels in use and all channels loaded.
6. The current through each channel meets the stated limits from the average current of all channels.
7. Dropout voltage is defined as the input-output differential at which the output voltage drops 2% below its nominal value measured at V_IN = V_OUT+ 1V.
April 2010
5
M9999-041210-C