MIC2592B
Electrical Characteristics (continued)(7)
Symbol
Parameter
Condition
IAUX(THRESH)
ISC(TRAN)
Auxiliary Output Current Limit
Threshold (Figure 4)
Maximum Transient Short Circuit
Current which must be drawn from
VAUX to register as a fault
VAUX Enabled, then Grounded
Current
ILIM(AUX)
RDIS(12V)
RDIS(3V)
RDIS(VAUX)
tOFF(12V)
tOFF(3V)
tSC(TRAN)
Regulated Current after Transient
Output Discharge Resistance
12VOUT[A/B]
3VOUT[A/B]
3VAUX[A/B]
12V Current Limit Response Time
(Figure 2)
3.3V Current Limit Response Time
(Figure 3)
VAUX[A/B] Current Limit Response
Time (Figure 5)
From end of ISC(TRAN) to CFILTER time-out
12VOUT[A/B] = 6.0V
3VOUT[A/B] = 1.65V
3VAUX[A/B] = 1.65V
MIC2592B-2BTQ
CGATE = 25pF
VIN –VSENSE = 140mV
MIC2592B-2BTQ
CGATE = 25pF
VIN –VSENSE =
140mV(8)
VAUX[A/B] = 0V, VSTBYA = VSTBYB = +3.3V
tPROP(12VFAULT)
tPROP(3VFAULT)
tPROP(VAUXFAULT)
tW
tPOR
Delay from 12V[A/B] Overcurrent
Limit to /FAULT output
Delay from 3V[A/B] Overcurrent
Limit to /FAULT[A/B] Output
Delay from VAUX[A/B] Overcurrent
ON[A/B], AUXEN[A/B] Pulse Width
MIC2592B Power-On Reset Time
after VSTBY[A/B] becomes valid
MIC2592B-2BTQ
CFILTER = 0
VIN –VSENSE
=
140mV(8)
MIC2592B-2BTQ
CFILTER = 0
VIN –VSENSE
=
140mV(8)
MIC2592B-2BTQ
limit to /FAULT[A/B] output
CFILTER = 0
VAUX Output
Grounded(8)
Note 8
Note 8
SMBus Timing
t1
SCL (clock) period
Figure 1
t2
Data In setup time to SCL HIGH
Figure 1
t3
Data Out stable after SCL LOW
Figure 1
t4
Data LOW setup time to SCL LOW Start condition, Figure 1
t5
Data HIGH hold time after SCL HIGH Stop condition, Figure 1
Notes:
7. Specification for packaged product only.
8. Parameters guaranteed by design. Not 100% production tested.
Micrel
Min Typ Max Units
0.84
A
IMAX
VSTBY[A /B]
RDS(AUX)
A
0.375 0.7 1.35 A
1600
Ω
150
Ω
430
Ω
1
2.0 µs
1
2.0 µs
2.5
5
µs
1
µs
1
µs
1
µs
100
ns
250
µs
2.5
µs
100
ns
300
ns
100
ns
100
ns
March 2005
9
M9999-033105