MIC2010 Datasheet, PDF (8/9 Pages) Micrel Semiconductor – USB Power Controller Advance Information

MIC2010
off. This time duration will be shortest in the case of a dead
short on the output.
Fault Status Output
The FAULT signal is an active-low output with a weak pull-
up or open-drain configuration. FAULT is asserted when
either an overcurrent or thermal shutdown condition occurs.
In the case of an overcurrent condition, FAULT will be
asserted only after the flag response delay time, t_DLY , has
elapsed. This ensures that FAULT is asserted only upon valid
overcurrent conditions and that erroneous error reporting is
eliminated. The FAULT response delay time t_DLY is typically
10ms. Since the delay timer is shared between both channels
it is possible for t_DLY to be extended by an amount equal to the
Micrel
difference between the occurrence of the over-current event
in both channels.
Undervoltage Lockout
Undervoltage lockout (UVLO) prevents the output MOSFET
from turning on until the AUX input exceeds approximately
3.5V. UVLO ensures that the output MOSFETs remain off to
prevent high transient inrush current due to stray or bulk load
capacitance. This helps to ensure that the power supply
voltage regulation is preserved and also prevents possible
damage to sensitive components.
EN
(MIC2010-2)
V_OUT
FAULT
Overcurrent Fault
Thermal Shutdown
Reached
Figure 6. MIC2010 System Timing
EN
(MIC2070-2)
V_OUT
FAULT
Overcurrent Fault
Load Removed–
Output Reset
Figure 7. MIC2070 System Timing—
Output Resets When Load is Removed
MIC2010/2070
8
September 2000