MIC2010/2070
Micrel
MIC2010/MIC2070
USB Power Controller
General Description
The MIC2010 is a dual channel USB power switch designed
to support the power distribution requirements for USB
Wakeup from the ACPI S3 state. The MIC2010 will directly
switch its two outputs between a 5V main supply and a
5V auxiliary supply normally provided in ATX style power
supplies.
The MIC2010 will adjust its current-limit threshold according
to the ACPI state it is in. In the normal active ACPI 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 a value
determined by an external resistor to minimize the current
that is supplied by the auxiliary supply, thereby ensuring that
voltage regulation is maintained even during fault conditions.
The MIC2010 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 MIC2070 option latches the output off upon detecting an
overcurrent condition lasting for more than 5ms minimum.
The output can be reset by either toggling the EN inputs of the
MIC2070-1/-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
• 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
• Circuit breaker options with auto-reset (MIC2070)
• Undervoltage lockout
• UL File #179633
Applications
•
•
•
•
•
Desktop PCs
Notebook PCs
Notebook docking stations
LAN Servers
PC motherboard
Typical Application
ATX Power Supply
5V MAIN
5V STANDBY
MIC2010-1P/-2P
MAIN
AUX
ON/OFF 1
ON/OFF 2
S3# CONTROL
82801AA or Equivalent
EN1
EN2
S3#
OUT1
OUT2
V
BUS
RSET1
100µF
D+
D–
GND
Downstream
USB
Port 2
100µF
V
BUS
D+
D–
GND
Downstream
USB
Port 1
FAULT1
FAULT1 RSET2
GND
SLP S3#
SLP S5#
OC0
OC1
Overcurrent Port 1
Overcurrent Port 1
Figure 1. USB Wakeup From ACPI S3 System Diagram
UL Recognized Component
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
January 2005
1
M9999-101104
MIC2010/2070
Micrel
Ordering Information
Part Number
Standard
MIC2010-1PCQS
MIC2010-2PCQS
MIC2070-1PCQS
MIC2070-2PCQS
Pb-Free
MIC2010-1PZQS
MIC2010-1PZQS
MIC2070-1PZQS
MIC2070-2PZQS
Enable
Active High
Active Low
Active High
Active Low
✓
✓
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
Package
16-lead QSOP
16-lead QSOP
16-lead QSOP
16-lead QSOP
Pin Configuration
FAULT1 1
EN1 2
S3# 3
RSET1 4
AUX 5
NC 6
RSET2 7
GND 8
16 FAULT2
15 EN2
14 OUT1
13 OUT1
12 MAIN
11 MAIN
10 OUT2
9 OUT2
16-Pin QSOP (QS)
M9999-101104
2
January 2005
MIC2010/2070
Micrel
Pin Description
Pin Number
1
Pin Name
FAULT1
Pin Function
Fault Status (Output): Channel 1, active-low; weak pull-up to AUX. FAULT1
is asserted LOW when channel 1 is in a thermal shutdown state or overcur-
rent condition for more than 5ms. MIC2070 latches this output in its asserted
state upon 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 MIC2070.
Control (Input): When this input is high, the MAIN inputs are connected to
OUT1 and OUT2 via 100mΩ, 500mA MOSFET switches. When this input is
LOW, the AUX inputs are connected to OUT1 and OUT2 via 500mΩ
MOSFET switches with a current-limit threshold specified by external
resistors, RSET1 and RSET2.
Current-Limt Set Resistor (Input): Channel 1. A resistor connected to this
input sets the current-limit threshold in AUX mode (S3# asserted). The
current-limit threshold is determined by approximately 18/RSET1.
Auxiliary 5V Supply (Input): Also used as power supply for internal circuitry.
No Connection: This pin may be connected to other pins without restriction.
Current-Limit Set Resistor (Input): Channel 2. A resistor connected to this
input sets the current-limit threshold in AUX mode (S3# asserted). The
current-limit threshold is determined by approximately 18/RSET2.
Ground
Channel 2 (Output): Both pins must be connected together externally.
5V Main Supply (Input): All MAIN inputs must be connected together
externally.
Channel 1 (Output): Both pins must be connected together externally.
Enable (Input): Channel 2, active-high (–1) or active-low (–2). Toggling this
input also resets the latched output for the MIC2070.
Fault Status (Output): Channel 2, active-low; weak pull-up to AUX. FAULT2
is asserted LOW when channel 2 is in a thermal shutdown state or overcur-
rent condition for more than 5ms. MIC2070 latches this output in it's asserted
state upon overcurrent condition. Toggling EN2 or removing load will reset
the circuit breaker latch, and deassert FAULT2.
2
3
EN1
S3#
4
RSET1
5
6
7
AUX
NC
RSET2
8
9, 10
11, 12
13, 14
15
16
GND
OUT2
MAIN
OUT1
EN2
FAULT2
January 2005
3
M9999-101104
MIC2010/2070
Micrel
Absolute Maximum Ratings
(1, 4)
Supply Voltage (V
IN
) ........................................ –0.3V to 6V
FAULT#, OUT1, OUT2 Output Pins ................. –0.3V to 6V
FAULT1,FAULT2, Output Current .............................. 25mA
ESD Rating
(3)
................................................................ 2kV
Operating Ratings
(2)
Supply Voltage (V
MAIN,
V
AUX
) ..................... +4.5V to +5.5V
Continuous Output Current (AUX Mode) .. 50mA to 300mA
Ambient Temperature (T
A
) ........................... –0°C to +70°C
Junction Temperature (T
J
) ....................... Internally Limited
Package Thermal Resistance
QSOP(θ
JA
) ........................................................ 163°C/W
Electrical Characteristics
V
MAIN
= 5V; AUX = 5V; R
SET
= 125Ω, T
A
= 25°C.
Symbol
V
MAIN
I
MAIN
I
LEAK
V
AUX
I
AUX
V
UV/AUX
V
HYS
R
DSMAIN
R
DSAUX
I
LIMIT
Parameter
MAIN Supply Voltage
MAIN Supply Current
(5)
MAIN Reverse Leakage Current
(5)
AUX Supply Voltage
AUX Supply Current
(5)
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
S3# = 1, I
OUT
= 500mA
S3# = 0, I
OUT
= 100mA
S3# = 1, V
OUT
= 4.0V, ramped load
V
OUT
= 0V
0.5
0.5
14.4
.8
–1
200
Outputs are off, V
OUT
= 0
Outputs latched off
V
OUT
rising
Output rising
T
J
increasing, single channel
T
J
decreasing, single channel
T
J
increasing, both channels
T
J
decreasing, both channels
I
FAULT
= 5mA
V
FAULT
= 5V
0.2
–10
TBD
1
1.95
.4
140
120
160
125
0.2
10
10
TBD
18
1.5
1.7
S3# = 0; No load, both switches ON
S3# = 0; No load, both switches OFF
V
AUX
increasing
V
AUX
decreasing
3.5
3.3
S3# = 1, both switches ON, no load
S3# = 1, both switches OFF, no load
S3# = 0, both switches ON, V
MAIN
= 0V
–10
4.5
5.0
.6
3.7
3.5
200
100
500
140
700
1.25
1.25
21.6
Condition
Min
4.5
Typ
5.0
16
Max
5.5
22
5
+10
5.5
1
5
4.0
3.8
Units
V
µA
µA
µA
V
mA
µA
V
V
mV
mΩ
mΩ
A
A
A•
Ω
V
V
µA
mV
µA
mA
V
V/s
°C
°C
°C
°C
V
µA
Current-Limit Factor (AUX Supply)
(6)
S3# = 0, I
OUT
= 50mA to 300mA
V
OUT
= 4V
V
TH
I
IN
V
HYS
I
OFF
S3#, EN1, EN2
Input Threshold Voltage
S3#, EN1, EN2 Input Current
EN1, EN2 and S3# Input Hysteresis
OUT1, 2 Leakage Current
Pull-Up Current During Latched
Output State (MIC2070-x only)
V
TH LATCH
Latch Reset Threshold
Minimum Output Slew Rate
to Reset Latch (MIC2070-x only)
(7)
Overtemperature Threshold
High-to-Low transition
Low-to-High transition
V
S3/EN
=5V, 0V
2.0
1
V
OL
FAULT1, 2 Output Low Voltage
FAULT1, 2 Output Off Current
(Not Applicable for 'P' versions)
M9999-101104
4
January 2005
MIC2010/2070
Symbol
V
OH
T
H
T
S
t
DLY
t
OC
Parameter
FAULT1, 2 Output High Voltage
(MIC2010-1P, 2P), (MIC2070-1P, 2P)
MAIN to S3# Hold Time,
Note 7
MAIN to S3# Set-up Time,
Note 7
FAULT Delay Filter Response Time
(Overcurrent only),
Note 8
Overcurrent Response Time
Condition
I
FAULT
= –20µA
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
Min
4
5
0
5
10
20
Typ
Max
Micrel
Units
V
ms
ms
ms
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
Notes:
1.
2.
3.
4.
5.
6.
7.
8.
9.
MAIN Output Turn-On Time
MAIN Output Turn-Off Time
MAIN Output Rise Time
MAIN Output Fall Time
AUX Output Turn-On Time
AUX Output Turn-Off Time
AUX Output Rise Time
AUX Output Fall Time
MAIN to AUX
Cross Conduction Time,
Note 9
AUX to MAIN
Cross Conduction Time,
Note 9
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 MIC2070-1(P) OFF occurs when V
EN
< 0.8V and ON occurs when V
EN
> 2.4V. For MIC2070-2(P) OFF occurs when V
EN
> 2.4V and ON
occurs when V
EN
< 0.8V.
Current-limit threshold is defined by the current-limit factor divided by R
SET
.
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.
Test Circuit
V
OUT
Device
Under OUT
Test
I
OUT
R
L
C
L
Timing Diagram
t
r
V
OUT
10%
90%
90%
10%
t
f
January 2005
5
M9999-101104
FPGA/CPLD
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