MIC2012
Micrel
MIC2012/MIC2072
USB Power Controller
Advance Information
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
current-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 en-
sure 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 re-
duces power consumption during fault conditions.
Features
• Compliant to USB power distribution specifications
• 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
during 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
100µF
82801AA or Equivalent
OUT1
OUT2
100µF
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
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
September 2000
1
MIC2012/2072
MIC2012
Micrel
Ordering Information
Part Number
MIC2012CM
MIC2012PCM*
MIC2012-1CQS*
MIC2012-1PCQS*
MIC2012-2CQS*
MIC2012-2PCQS*
MIC2072CM*
MIC2072PCM*
MIC2072-1CQS*
MIC2072-1PCQS*
MIC2072-2CQS
MIC2072-2PCQS*
* Contact factory for availability.
Enable
n/a
n/a
Active High
Active High
Active Low
Active Low
n/a
n/a
Active High
Active High
Active Low
Active Low
Fault
Output
Open-Drain
Internal Pull-Up
Open-Drain
Internal Pull-Up
Open-Drain
Internal Pull-Up
Open-Drain
Internal Pull-Up
Open-Drain
Internal Pull-Up
Open-Drain
Internal Pull-Up
Circuit Breaker
Function
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
0°C to +70°C
Package
8-lead SOIC
8-lead SOIC
16-lead QSOP
16-lead QSOP
16-lead QSOP
16-lead QSOP
8-lead SOIC
8-lead SOIC
16-lead QSOP
16-lead QSOP
16-lead QSOP
16-lead QSOP
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
0°C to +70°C
Pin Configuration
FAULT1 1
EN1 2
FAULT1 1
S3# 2
AUX 3
GND 4
8 FAULT2
7 OUT1
6 MAIN
5 OUT2
16 FAULT2
15 EN2
14 OUT1
13 OUT1
12 MAIN
11 MAIN
10 OUT2
9 OUT2
S3# 3
NC 4
AUX 5
NC 6
NC 7
GND 8
8-Pin SOIC (M)
16-Pin QSOP (QS)
MIC2012/2072
2
September 2000
MIC2012
Micrel
Pin Description
Pin Number
(MIC2012)
1
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
overcurrent 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
connected together.
5V Main Supply (Input): All MAIN inputs must be connected together
externally.
Channel 1 (Output): For MIC2012-1, -2 both pins must be externally
connected 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
overcurrent condition. Toggling EN2 or removing the load will reset the
circuit breaker latch and deassert FAULT2.
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
September 2000
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
3.5
3.3
3.7
3.5
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
.8
0.5
0.5
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
1.25
1.25
195
5.0
.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
September 2000
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
.2
10
Condition
V
OUT
Rising
Min
Typ
1.95
.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.
September 2000
5
MIC2012/2072
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