MIC2012
Micrel
MIC2012/MIC2072
USB Power Controller
General Description
The MIC2012 is a dual channel USB power switch designed to
support the power distribution requirements for USB Wakeup
from the ACPI S3 state. The MIC2012 will directly switch its
two outputs between a 5V main supply and a 5V auxiliary
supply normally provided in ATX style power supplies.
The MIC2012 will adjust its current-limit threshold according
to the ACPI state it is in. In the normal active S0 state the cur-
rent-limit is set at 500mA minimum per channel satisfying the
USB continuous output current specification. In the S3 state
the current-limit can be reduced to only 100mA per channel
to minimize the current that is supplied by the auxiliary supply
thereby ensuring that voltage regulation is maintained even
during fault conditions.
The MIC2012 provides make-before-break switching to ensure
glitch-free transitions between the S3 and S0 states. Each
channel is also thermally isolated from the other so that a
fault in one channel does not effect the other. FAULT status
output signals are also provided indicating overcurrent and
thermal shutdown conditions.
The MIC2072 option latches the output off upon detecting
an overcurrent condition for more than 5ms minimum. The
output can be reset by either toggling the EN inputs of the
MIC2072-1, -2 or by removing the load. Latching the output
off provides a circuit breaker mode of operation which reduces
power consumption during fault conditions.
Features
•
•
•
•
•
•
•
•
•
•
•
•
Compliant to USB power distribution specifications
UL Recognized Component
Two completely independent switches
Integrated switching matrix supports ACPI S0/S3 state
transitions without external FET circuits
Make-before-break switching ensures glitch-free
transitions
No back-feed of auxiliary supply onto main supply dur-
ing standby mode
Bi-level current-limit preserves auxiliary supply voltage
regulation in standby mode
Thermally isolated channels
Thermal shutdown protection
Fault status outputs with filter prevents false assertions
during hot-plug events
Latched thermal shutdown options with auto-reset
(MIC2072)
Undervoltage lockout
Applications
•
•
•
•
•
Desktop PCs
Notebook PCs
Notebook Docking stations
LAN Servers
PC Motherboards
Typical Application
ATX Power Supply
5V MAIN
5V STANDBY
MIC2012P
MAIN
AUX
S3 Control
S3#
FAULT1#
FAULT2#
GND
100F
82801AA or Equivalent
OUT1
OUT2
100F
V
BUS
D+
D–
GND
Downstream
USB
Port 1
V
BUS
D+
D–
GND
Downstream
USB
Port 2
SLP S3#
SLP S5#
OC0
OC1
Overcurrent Port 1
Overcurrent Port 1
Figure 1. USB Wakeup with Control Input
UL Recognized Component
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
January 2005
1
MIC2012/2072
MIC2012
Micrel
Part Number
Ordering Information
Standard
MIC2012BM
(1)
MIC2012CM
MIC2012PCM
MIC2012-1PCQS
MIC2012-2PCQS
MIC2072-1PCQS
MIC2072-2PCQS
Note:
1.
Contact factory for availablity
Pb-Free
MIC2012YM
(1)
MIC2012ZM
MIC2012PZM
MIC2012-1PZQS
MIC2012-2PZQS
MIC2072-2PZQS
MIC2072-2PZQS
Enable
n/a
n/a
n/a
Active High
Active Low
Active High
Active Low
Fault Output
Open-Drain
Open-Drain
Internal Pull-Up
Internal Pull-Up
Internal Pull-Up
Internal Pull-Up
Internal Pull-Up
Circuit Breaker
Range
Temperature
Range
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
Package
8-lead SOIC
8-lead SOIC
8-lead SOIC
16-lead QSOP
16-lead QSOP
16-lead QSOP
16-lead QSOP
Δ
Δ
0°C to +70°C
0°C to +70°C
Pin Configuration
FAULT1
1
16 FAULT2
15 EN2
14 OUT1
13 OUT1
12 MAIN
11 MAIN
10 OUT2
9 OUT2
FAULT1
1
8 FAULT2
7 OUT1
6 MAIN
5 OUT2
EN1 2
S3# 3
NC 4
AUX 5
NC 6
S3# 2
AUX 3
GND 4
8-Pin SOIC (M)
NC 7
GND 8
16-Pin QSOP (QS)
MIC2012/2072
2
January 2005
MIC2012
Micrel
Pin Number
(MIC2012-1, -2)
1
Pin Name
FAULT1
Pin Function
Fault Status (Output): Internal pull-up or open-drain. Asserted LOW when
Channel is in a thermal shutdown state or overcurrent condition for more
than 5ms. MIC2072 latches this output in its asserted state upon an over-
current condition. Toggling EN1 or removing the load will reset the circuit
breaker latch and deassert FAULT1.
Enable (Input): Channel 1, active-high (–1) or active-low (–2). Toggling this
input also resets the latched output of the MIC2072.
Control (Input): When this input is HIGH, the MAIN inputs are connected to
OUT1 and OUT2 via 100mΩ MOSFET switches. When this input is LOW
the AUX inputs are connected to OUT1 and OUT2 via 500mΩ MOSFET
switches.
Auxiliary 5V Supply (Input): Also used as power supply for internal circuitry.
No Connection: This pin may be connected to other pins without restriction.
Ground
Channel 2 (Output): For MIC2012-1, -2 both pins must be externally con-
nected together.
5V Main Supply (Input): All MAIN inputs must be connected together exter-
nally.
Channel 1 (Output): For MIC2012-1, -2 both pins must be externally con-
nected together.
Enable (Input): Channel 2, active-high (–1) or active-low (–2). Toggling this
input also resets the latched output of the MIC2072.
Fault Status (Output): Internal pull-up or open-drain. Asserted LOW when
Channel 2 is in a thermal shutdown state or overcurrent condition for more
than 5ms. MIC2072 latches this output in its asserted state upon an over-
current condition. Toggling EN2 or removing the load will reset the circuit
breaker latch and deassert FAULT2.
Pin Description
Pin Number
(MIC2012)
1
n/a
2
2
3
EN1
S3#
3
n/a
4
5
6
7
n/a
8
5
4, 6, 7
8
9, 10
11, 12
13, 14
15
16
AUX
NC
GND
OUT2
MAIN
OUT1
EN2
FAULT2
January 2005
3
MIC2012/2072
MIC2012
Micrel
Absolute Maximum Ratings
(Note 1, Note 4)
Supply Voltage (V
IN,
V
MAIN,
V
AUX
) .....................–0.3V to 6V
EN1, EN2, S3# Input Pins .................................–0.3V to 6V
FAULT#, OUT1, OUT2 Output Pins...................–0.3V to 6V
FAULT Output Current ................................................ 25mA
ESD Rating,
Note 3
...................................................... 2kV
Operating Ratings
(Note 2)
Supply Voltage (V
MAIN,
V
AUX
) ...................... +4.5V to +5.5V
Ambient Temperature (T
A
) ............................ –0°C to +70°C
Junction Temperature (T
J
) ........................ Internally Limited
Package Thermal Resistance
QSOP
(θ
JA
)
.......................................................................
163°C/W
SOIC
(θ
JA
)
.........................................................................
160°C/W
Electrical Characteristics
V
MAIN
= 5V; AUX = 5V; T
A
= 25°C; unless noted
Symbol
V
MAIN
I
MAIN (ON)
I
MAIN (OFF)
I
LEAK
V
AUX
I
AUX ON
I
AUX OFF
V
UV/AUX
V
HYS
R
DSMAIN
R
DSAUX
I
LIMIT(MAIN)
I
LIMIT(AUX)
V
TH
Parameter
MAIN Supply Voltage
MAIN Supply Current Switches On
Note 5
S3# = 1, no load
Condition
Min
4.5
Typ
5.0
16
Max
5.5
22
5
–10
4.5
No load
S3# = 0
No load
S3# = 0
V
AUX
increasing
V
AUX
decreasing
3.1
2.9
200
S3# = 1, I
OUT
= 500mA
S3# = 0, I
OUT
= 100mA
S3# = 1, V
OUT
= 4.0V, ramped load
V
OUT
= 0V
S3# = 0, V
OUT
= 4.0V, ramped load
V
OUT
= 0V, C
OUT
= 100µF
High-to-Low transition
Low-to-High transition
0.8
0.8
0.65
105
150
80
1.5
1.7
200
V
S3/EN
= 5V, 0V
Outputs are off, V
OUT
= 0
Outputs latched off
–1
–10
1
1
10
2.0
100
500
140
700
2.0
1.8
195
5.0
0.6
+10
5.5
1
5
4.0
3.8
Units
V
µA
µA
µA
V
mA
µA
V
V
mV
mΩ
mΩ
A
A
mA
mA
V
V
mV
µA
µA
mA
MAIN Supply Current Switches Off
S3# = 1, no load
Note 5,
(MIC20x2-1, MIC20x2-2 only)
MAIN Reverse Leakage Current,
AUX Supply Voltage
AUX Supply Current,
both switches on,
Note 5
AUX Supply Current, switches
off. (MIC20x2-1, MIC20x2-2 only)
AUX Undervoltage Lockout
Threshold
AUX Undervoltage Lockout
Hysteresis
MAIN On-Resistance, Each Output
AUX On-Resistance, Each Output
MAIN Current-Limit Threshold
MAIN Short-Circuit Current-Limit
AUXCurrent-Limit Threshold
AUX Short-Circuit Current-Limit
S3#, EN1, EN2. Input
Threshold Voltage
(EN1, EN2, for MIC20x2-x only)
EN1, EN2 and S3# Input Hysteresis
(EN1, EN2, for MIC20x2-x only)
S3#, EN1, EN2 Input Current
(EN1, EN2, for MIC20x2-x only)
OUT1, OUT2 Leakage Current
(MIC2012-x, MIC2072-x only)
Pull-Up Current During Latched
Output State (MIC2072-1, -2)
S3# = 0, both switches ON, V
MAIN
= 0V
V
HYS
I
IN
I
OFF
MIC2012/2072
4
January 2005
MIC2012
Symbol
V
TH LATCH
Parameter
Latch Reset Threshold
(MIC2072, MIC2072-x only)
Minimum Output Slew Rate
to Reset Latch
(MIC2072, MIC2072-x only),
Note 6
Overtemperature Threshold
T
J
increasing, single channel
T
J
decreasing, single channel
T
J
increasing, both channels
T
J
decreasing, both channels
I
FAULT
= 5mA
I
FAULT
= –20µA
V
FAULT
= 5V
Figure 5
Figure 5
Output shorted to ground, Figure 4
Output shorted to ground, Figure 4
MAIN output
AUX output
R
L
= 10Ω, C
L
= 1µF, Figure 3
R
L
= 10Ω, C
L
= 1µF, Figure 3
R
L
= 10Ω, C
L
= 1µF, Figure 3
R
L
= 10Ω, C
L
= 1µF, Figure 3
R
L
= 50Ω, C
L
= 1µF, Figure 3
R
L
= 50Ω, C
L
= 1µF, Figure 3
R
L
= 50Ω, C
L
= 1µF, Figure 3
R
L
= 50Ω, C
L
= 1µF, Figure 3
S3# transition to 0
S3# transition to 1
5
0
5
10
20
4
0.2
10
Condition
V
OUT
Rising
Min
Typ
1.95
0.4
Max
Micrel
Units
V
V/s
140
120
160
150
0.2
°C
°C
°C
°C
V
V
µA
ms
ms
ms
V
OL
V
OH
FAULT Output Low Voltage
FAULT Output High Voltage
(MIC2012-1P,-2P),(MIC2072-1P,-2P)
FAULT Output Off Current
(Not Applicable to 'P' Options)
T
H
T
S
t
DLY
t
OC
MAIN to S3# Hold Time,
Note 6
MAIN to S3# Set-up Time,
Note 6
FAULT Delay Filter Response Time
(Overcurrent only),
Note 7
Overcurrent Response Time
2
2
2
35
2
32
0.6
120
0.5
115
5
5
7.5
7.5
µs
µs
ms
µs
ms
µs
ms
µs
ms
µs
ms
ms
t
ON(MAIN)
t
OFF(MAIN)
t
r(MAIN)
t
f(MAIN)
t
ON(AUX)
t
OFF(AUX)
t
r(AUX)
t
f(AUX)
t
XMA
t
XAM
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Note 6.
Note 7.
Note 8.
MAIN Output Turn-On Time
MAIN Output Turn-Off Time
(MIC20x2-x only)
MAIN Output Rise Time
MAIN Output Fall Time
(MIC20x2-x only)
AUX Output Turn-On Time
AUX Output Turn-Off Time
(MIC20x2-x only)
AUX Output Rise Time
AUX Output Fall Time
(MIC20x2-x only)
MAIN to AUX
Cross Conduction Time,
Note 8
AUX to MAIN
Cross Conduction Time,
Note 8
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
All voltages are referenced to ground.
For MIC20x2-1(P) OFF occurs when V
EN
< 0.8V and ON occurs when V
EN
> 2.4V. For MIC20x2-2(P) OFF occurs when V
EN
> 2.4V and ON
occurs when V
EN
< 0.8V.
Guaranteed by design. Not production tested.
Assumes only one channel in current-limit. Delay circuitry is shared among channels so it is possible for t
DLY
to be 40ms max if one channel
enters current-limit as the other is about to time-out.
Cross conduction time is the duration in which both MAIN and AUX internal switches are on subsequent to S3# transitioning.
January 2005
5
MIC2012/2072
单片机
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