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Power Controller. MIC2010 Datasheet |
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MIC2010/2070
MIC2010/MIC2070
USB Power Controller
Micrel
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
ON/OFF 1
ON/OFF 2
S3# CONTROL
82801AA or Equivalent
SLP S3#
SLP S5#
OC0
OC1
Overcurrent Port 1
Overcurrent Port 1
MIC2010-1P/-2P
MAIN
AUX
OUT1
EN1 OUT2
EN2
S3# RSET1
FAULT1
FAULT1 RSET2
GND
100µF
100µF
VBUS
D+
D–
GND
VBUS
D+
D–
GND
Figure 1. USB Wakeup From ACPI S3 System Diagram
Downstream
USB
Port 1
Downstream
USB
Port 2
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
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MIC2010/2070
Ordering Information
Part Number
Standard
Pb-Free
MIC2010-1PCQS MIC2010-1PZQS
MIC2010-2PCQS MIC2010-1PZQS
MIC2070-1PCQS MIC2070-1PZQS
MIC2070-2PCQS 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
Micrel
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
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MIC2010/2070
Pin Description
Pin Number
1
2
3
4
5
6
7
8
9, 10
11, 12
13, 14
15
16
Pin Name
FAULT1
EN1
S3#
RSET1
AUX
NC
RSET2
GND
OUT2
MAIN
OUT1
EN2
FAULT2
Micrel
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.
January 2005 3 M9999-101104
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