MIC2012 MICREL [Micrel Semiconductor], MIC2012 Datasheet - Page 9

• Manufacturer Part Number: MIC2012
• Description: USB Power Controller Advance Information
• Manufacturer: MICREL [Micrel Semiconductor]

Fault Status Output
The FAULT signal is an active-low output with an open-drain
or weak pull-up configuration. FAULT is asserted (active-low)
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
elapsed. This ensures that FAULT is asserted only upon valid
overcurrent conditions and that erroneous error reporting is
eliminated. For example, false overcurrent conditions can
occur during hot-plug events when a highly capacitive load is
connected and causes a high transient inrush current that
exceeds the current-limit threshold. The FAULT response
delay time t
September 2000
MIC2012
DLY
is typically 10ms.
(MIC2010-2)
(MIC2070-2)
FAULT
FAULT
V
V
OUT
OUT
EN
EN
Output Resets When Load is Removed
Figure 7. MIC2072 System Timing—
Figure 6. MIC2012 System Timing
DLY
, has
9
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.
Thermal Shutdown
Load Removed–
Overcurrent Fault
Overcurrent Fault
Output Reset
Reached
MIC2012/2072
Micrel