MICREL MIC2070-2CQS, MIC2070-1PCQS, MIC2070-1CQS, MIC2010-2PCQS, MIC2010-1CQS Datasheet
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September 2000 1 MIC2010/2070
MIC2010 Micrel
MIC2010/MIC2070
USB Power Controller
Advance Information
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.
Typical Application
MIC2010-1P/-2P
V
BUS
D+
D–
GND
MAIN
AUX OUT1
EN1
EN2
Downstream
USB
Port 1
100µF
5V MAIN
ATX Power Supply
S3#
FAULT1
FAULT1
V
BUS
D+
D–
GND
Downstream
USB
Port 2
OUT2
RSET1
RSET2
GND
5V STANDBY
82801AA or Equivalent
SLP S3#
SLP S5#
OC0
OC1
Overcurrent Port 1
Overcurrent Port 1
ON/OFF 1
ON/OFF 2
100µF
S3# CONTROL
Figure 1. USB Wakeup From ACPI S3 System Diagram
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
Applications
• Desktop PCs
• Notebook PCs
• Notebook docking stations
• LAN Servers
• PC motherboard
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
MIC2010 Micrel
MIC2010 2 September 2000
Pin Configuration
1FAULT1
EN1
S3#
RSET1
AUX
NC
RSET2
GND
16 FAULT2
EN2
OUT1
OUT1
MAIN
MAIN
OUT2
OUT2
15
14
13
12
11
10
9
2
3
4
5
6
7
8
16-Pin QSOP (QS)
Ordering Information
Fault Circuit Breaker Temperature
Part Number Enable Output Function Range Package
MIC2010-1CQS* Active High Open-Drain 0°C to +70°C 16-lead QSOP
MIC2010-1PCQS* Active High Internal Pull-Up 0°C to +70°C 16-lead QSOP
MIC2010-2CQS* Active Low Open-Drain 0°C to +70°C 16-lead QSOP
MIC2010-2PCQS Active Low Internal Pull-Up 0°C to +70°C 16-lead QSOP
MIC2070-1CQS Active High Open-Drain ✓ 0°C to +70°C 16-lead QSOP
MIC2070-1PCQS* Active High Internal Pull-Up ✓ 0°C to +70°C 16-lead QSOP
MIC2070-2CQS* Active Low Open-Drain ✓ 0°C to +70°C 16-lead QSOP
MIC2070-2PCQS* Active Low Internal Pull-Up ✓ 0°C to +70°C 16-lead QSOP
* Contact factory for availability.
September 2000 3 MIC2010/2070
MIC2010 Micrel
Pin Description
Pin Number Pin Name Pin Function
1 FAULT1 Fault Status (Output): Channel 1, active-low; weak pull-up to AUX or open-
drain. FAULT1 is asserted LOW when channel 1 is in a thermal shutdown
state or overcurrent 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.
2 EN1 Enable (Input): Channel 1, active-high (–1) or active-low (–2). Toggling this
input also resets the latched output of the MIC2070.
3 S3# 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.
4 RSET1 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.
5 AUX Auxiliary 5V Supply (Input): Also used as power supply for internal circuitry.
6 NC No Connection: This pin may be connected to other pins without restriction.
7 RSET2 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.
8 GND Ground
9, 10 OUT2 Channel 2 (Output): Both pins must be connected together externally.
11, 12 MAIN 5V Main Supply (Input): All MAIN inputs must be connected together
externally.
13, 14 OUT1 Channel 1 (Output): Both pins must be connected together externally.
15 EN2 Enable (Input): Channel 2, active-high (–1) or active-low (–2). Toggling this
input also resets the latched output for the MIC2070.
16 FAULT2 Fault Status (Output): Channel 2, active-low; weak pull-up to AUX or open-
drain. FAULT2 is asserted LOW when channel 2 is in a thermal shutdown
state or overcurrent 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.
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