MIC2591B_05 Datasheet, PDF (9/34 Pages) Micrel Semiconductor – Dual-Slot PCI Express Hot-Plug Controller

MIC2591B
Electrical Characteristics (continued)⁽⁷⁾
Symbol
Parameter
Condition
I_AUX(THRESH)
I_SC(TRAN)
Auxiliary Output Current Limit
Threshold (Figure 4)
Maximum Transient Short Circuit
Current
Current which must be drawn from
V_AUX to register as a fault
V_AUX Enabled, then Grounded
I_LIM(AUX)
R_DIS(12V)
R_DIS(3V)
R_DIS(VAUX)
t_OFF(12V)
t_OFF(3V)
t_SC(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 I_SC(TRAN) to C_FILTER time-out
12V_OUT[A/B] = 6.0V
3V_OUT[A/B] = 1.65V
3V_AUX[A/B] = 1.65V
MIC2591B-2BTQ
C_GATE = 25pF
V_IN –V_SENSE = 140mV
MIC2591B-2BTQ
C_GATE = 25pF
V_IN –V_SENSE =
140mV⁽⁸⁾
V_AUX[A/B] = 0V, V_STBYA = V_STBYB = +3.3V
t_{PROP(12VFAULT)} Delay from 12V[A/B] Overcurrent
Limit to /FAULT output
t_{PROP(3VFAULT)} Delay from 3V[A/B] Overcurrent
Limit to /FAULT[A/B] Output
t_{PROP(VAUXFAULT)} Delay from VAUX[A/B] Overcurrent
t_W
t_POR
ON[A/B], AUXEN[A/B] Pulse Width
MIC2591B Power-On Reset Time
after VSTBY[A/B] becomes valid
MIC2591B-2BTQ
C_FILTER = 0
V_IN –V_SENSE
=
140mV⁽⁸⁾
MIC2591B-2BTQ
C_FILTER = 0
V_IN –V_SENSE
=
140mV⁽⁸⁾
MIC2591B-2BTQ
limit to /FAULT[A/B] output
C_FILTER = 0
V_AUX 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
= I_MAX
V_STBY[A/B]
R_DS(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