icrel, Inc.
MIC2587/MIC2587R
anuary 24, 2013
16
Revision 2.0
Input Undervoltage Lockout
The MIC2587/MIC2587R have an internal undervoltage
lockout circuit that inhibits operation of the controllers
internal circuitry unless the power supply voltage is stable
and within an acceptable tolerance. If the supply voltage
to the controller with respect to ground is greater than the
V
UVH
threshold voltage (8V typical), the controllers
internal circuits are enabled and the controller is then
ready for normal operation pending the state of the ON
pin voltage. Once in steady-state operation, the
controllers internal circuits remain active so long as the
supply voltage with respect to ground is higher than the
controllers internal V
UVL
threshold voltage (7.5V typical).
Power-is-Good Output Signals
For the MIC2587-1 and MIC2587R-1, the power-good
output signal (PWRGD) will be high impedance when the
FB pin voltage is higher than the V
FBH
threshold and will
pull-down to GND when the FB pin voltage is lower than
the V
FBL
threshold. For the MIC2587-2 and MIC2587R-2,
the power-good output signal (/PWRGD) will pull down to
GND when the FB pin voltage is higher than the V
FBH
threshold and will be high impedance when the FB pin
voltage is lower than the V
FBL
threshold. Hence, the (1)
parts have an Active-HIGH PWRGD signal and the (2)
parts have an Active-LOW /PWRGD output. PWRGD (or
/PWRGD) may be used as an enable signal for one or
more following DC/DC converter modules or for other
system uses as desired. When used as an enable signal,
the time necessary for the PWRGD (or /PWRGD) signal
to pull-up (when in high impedance state) will depend
upon the (RC) load at the Power-is-Good pin.
The Power-is-Good output pin is connected to an open-
drain, N-channel transistor implemented with high-voltage
structures. These transistors are capable of operating
with pull-up resistors to supply voltages as high as 100V.
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