Micrel, Inc.
MIC2590B
September 2008
8
M9999-091808
Symbol
Parameter
Condition
Min
Typ
Max
Units
I
LIM(AUX)
Regulated Current after Transient
From end of I
SC(TRAN)
to C
FILTER
Time Out
0.375
0.7
1.35
A
R
DISCH
R
(12V)
R
(12MV)
R
(3V)
R
(5V)
R
(3VAUX)
Output Discharge Resistance
12V
OUT
[A/B]
12MV
OUT
[A/B]
3V
OUT
[A/B]
5V
OUT
[A/B]
3V
AUX
[A/B]
12V
OUT
[A/B] = 6.0V
12MV
OUT
[A/B] = 6.0V
3V
OUT
[A/B] = 1.65V
5MV
OUT
[A/B] = 2.5V
5V
OUT
[A/B] = 1.65V
1600
600
150
150
430
&
&
&
&
&
t
OFF(3)
t
OFF(5)
Current Limit Response Time for 3.3V
and 5V Outputs, Figure 2
MIC2590B-2 with C
GATE
= 10nF,
V
IN
V
SENSE
= 200mV
1
祍
T
SC(TRAN)
V
AUX
Current Limiter Response Time,
Figure 5
V
AUX
[A/B] = 0V, Note 5
33
祍
t
OFF(12)
12V Current Limit Response Time,
Figure 3
12V
OUT
[A/B] = 0V, Note 5
1
祍
t
OFF(12M)
12V Current Limit Response Time,
Figure 3
12MV
OUT
[A/B] = 0V, Note 5
1
祍
T
PROP(3VFAULT)
Delay from 3V[A/B] overcurrent-limit to
FAULT Output
MIC2590B-2, V
SENSE
V
THLIMIT
=
200mV, C
FILTER
= open
1
祍
T
PROP(5VFAULT)
Delay from 5V[A/B] overcurrent-limit to
FAULT Output
MIC2590B-2, V
SENSE
V
THLIMIT
=
200mV, C
FILTER
= open
1
祍
t
W
ON[A/B], AUXEN[A/B] Pulse Width
Note 5
100
ns
t
POR
MIC2590B Power-On Reset Time after
VSTBY becomes valid
Note 5
500
祍
8-Bit Analog to Digital Converter
Total Unadjusted Error Voltage,
All Outputs
Current, 3V
OUT
[A/B]/5V
OUT
[A/B]
Current, V
AUX
[A/B], 12V
OUT
[A/B],
12MV
OUT
[A/B]
Measured as voltage across
corresponding external R
SENSE
3
3
?
+3
+3
%
%
%
t
CONV
Conversion Time
60
100
ms
V
AUXA
V
AUXB
Resolution Specifications:
Full Scale Voltage
LSB of Voltage
Full Scale Current
LSB of Current
3.85
15.1
375
1.47
V
mV
mA
mA
3V
OUTA
3V
OUTB
Full Scale Voltage
LSB of Voltage
Full Scale Current
LSB of Current
External R
SENSE
= 6.00m&
3.85
15.1
11.6
45.5
V
mV
A
mA
5V
OUTA
5V
OUTB
Full Scale Voltage
LSB of Voltage
Full Scale Current
LSB of Current
External R
SENSE
= 6.00m&
5.89
23.1
6.96
27.3
V
mV
A
mA
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