MIC2040 Datasheet, PDF (2/15 Pages) Micrel Semiconductor – Single Channel Low Voltage Power Distribution Switch

MIC2040/2041
Pin Configuration
EN 1
/FAULT 2
UVLOIN 3
GND 4
ILIM 5
10 VOUT
9 VIN
8 VOUT
7 VIN
6 VBIAS
MIC2040/MIC2041
10-Pin MSOP (MM)
Micrel
Pin Description
Pin Number
1
2
4
5
7, 9
8, 10
6
3
Pin Name
EN
/FAULT
GND
ILIM
VIN
VOUT
VBIAS
UVLOIN
Pin Function
Switch Enable Input: Gate control pin of the output MOSFET available as an
active high (–1) or active low (–2) input signal.
Fault Status Output: Open drain N-Channel device, active low. This pin
indicates an overcurrent, or thermal shutdown condition. For an overcurrent
event, /FAULT is asserted if the duration of the overcurrent condition lasts
longer than 28ms.
Ground Connection: Tie to analog ground.
Current Limit Set: A resistor, R_SET, connected to this pin sets the current
limit threshold as CLF/R_SET, where CLF is the current limit factor specified in
the electrical characteristics table. For the MIC2040/41, the continuous
output current range is 0.25A to 1.5A.
Switch Input Supply: The drain of the output MOSFET. The range of input
for the switch is 0.8V to 5.5V. These pins must be externally connected
together.
Switch Output: The source of the output MOSFET. These pins must be
externally connected together.
Bias Supply Input: This input pin supplies bias to operate the switch with
range from 1.6V to 5.5V. When switching voltage (V_IN) is between 1.6V to
5.5V and the use of a single supply is desired, connect VBIAS to VIN
externally.
Undervoltage Lockout Adjust Input: With this pin left open, the UVLO
threshold is internally set to 1.45V. When the switching voltage (V_IN) is at or
below 1.6V, connecting an external resistive divider to this input will lower
the UVLO threshold. The total resistance must be less than 200kΩ. See
“Applications Information” for further detail.
M9999-012004
2
January 2005