Datasheet
Micrel, Inc. MIC20xx Family
August 2011
9
M9999-080211-D
Descriptions
These pin and signal descriptions aid in the
differentiation of a pin from electrical signals and
components connected to that pin. For example, VOUT
is the switch’s output pin, while V
OUT
is the electrical
signal output voltage present at the VOUT pin.
Pin Descriptions
Pin Name Type Description
VIN Input Supply input. This pin provides power to both the output switch and the switch’s internal control circuitry.
GND Ground.
EN Input Switch Enable (Input):
FAULT/ Output
Fault status. A logic LOW on this pin indicates the switch is in current limiting, or has been shut down by
the thermal protection circuit. This is an open-drain output allowing logical OR’ing of multiple switches.
CSLEW Input
Slew rate control. Adding a small value capacitor between this pin and VIN slows turn-ON of the power
FET.
VOUT Output Switch output. The load being driven by the switch is connected to this pin.
VUVLO Input
Variable Under Voltage Lockout (VUVLO): Monitors the input voltage through a resistor divider between
VIN and GND. Shuts the switch off if voltage falls below the threshold set by the resistor divider.
Previously called VUVLO.
ILIMIT Input Set current limit threshold via a resistor connected from ILIMIT to GND.
EP Thermal On MLF packages connect EP to GND.
Signal Descriptions
Signal Name Type Description
V
IN
Input Electrical signal input voltage present at the VIN pin.
GND Ground.
V
EN
Input Electrical signal input voltage present at the ENABLE pin.
V
FAULT/
Output Electrical signal output voltage present at the FAULT/ pin.
C
SLEW
Component Capacitance value connected to the CSLEW pin.
V
OUT
Output Electrical signal output voltage present at the VOUT pin.
V
VUVLO_TH
Internal
VUVLO internal reference threshold voltage. This voltage is compared to the VUVLO pin input
voltage to determine if the switch should be disabled. Reference threshold voltage has a typical
value of 250mV.
C
LOAD
Component Capacitance value connected in parallel with the load. Load capacitance.
I
OUT
Output Electrical signal output current present at the VOUT pin.
I
LIMIT
Internal Switch’s current limit. Fixed at factory or user adjustable.