Micrel
MIC2589/MIC2595
Pin Desription (cont.)
Pin Number
Pin Name
Pin Function
Power-Good Output 2: Asserted when the following is true: (PWRGD1 = Asserted)
12
PWRGD2
(MIC25XX-1) AND (Time after Assertion of PWRGD1 = Time PWRGD2, as programmed by the
capacitor on PGTIMER). Once PWRGD1 is asserted, the PGTIMER pin begins to
charge and PWRGD2 will assert when PGTIMER crosses the PWRGD2 threshold
(VTHRESH(PG2) = 0.63V, typical). Also see PWRGD1 and PGTIMER pin descriptions
12
13
13
/PWRGD2
/Power-Good Output 2: Asserted when the following is true: (/PWRGD1 = Asserted)
(MIC25XX-2) AND (Time after Assertion of /PWRGD1 = Time /PWRGD2, as programmed by the
capacitor on PGTIMER). Once /PWRGD1 is asserted, the PGTIMER pin begins to
charge and /PWRGD2 will assert when PGTIMER crosses the /PWRGD2 threshold
(VTHRESH(PG2) = 0.63V, typical). Also see /PWRGD1 and PGTIMER pin descriptions.
PWRGD3
Power-Good Output 3: Asserted when the following is true: (PWRGD1 = Asserted)
(MIC25XX-1) AND (Time after Assertion of PWRGD1 = Time PWRGD3, as programmed by the
capacitor on PGTIMER). Once PWRGD1 is asserted, the PGTIMER pin begins to
charge and PWRGD3 will assert when PGTIMER crosses the PWRGD3 threshold
(VTHRESH(PG3) = 1.15V, typical). Also see PWRGD1 and PGTIMER pin descriptions.
/PWRGD3
/Power-Good Output 3: Open Collector. Asserted when the following is true:
(MIC25XX-2) (/PWRGD1 = Asserted) AND (Time after Assertion of /PWRGD1 = Time /PWRGD3,
as programmed by the capacitor on PGTIMER). Once /PWRGD1 is asserted, the
PGTIMER pin begins to charge and /PWRGD3 will assert when PGTIMER crosses
the /PWRGD3 threshold (VTHRESH(PG3) = 1.15V, typical). Also see /PWRGD1 and
PGTIMER pin descriptions.
14
VDD
Positive Supply Input: Connect to the positive, or high side, terminal of the input
power supply.
5
M9999-120505
(408) 955-1690
December 2005
MICREL [ MICREL SEMICONDUCTOR ]
