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MIC2012CM
EEWorld咨询电话：82357002，82350740－8068 邮件咨询：datasheet@eeworld.com.cn 器件描述：USB Power Controller Advance Information 器件厂商：MICREL [Micrel Semiconductor] 厂商主页：http://www.micrel.com/ 文件大小：56.4KB 文件页数：10 PDF阅读：MIC2012CM.pdf (点击阅读器件资料) 摘要： September 2000 1 MIC2012/2072 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. Typical Application MIC2012P V BUS D+ D– GND MAIN AUX OUT1 Downstream USB Port 1 100?F 5V MAIN ATX Power Supply S3# FAULT1# FAULT2# V BUS D+ D– GND Downstream USB Port 2 OUT2 GND 5V STANDBY 82801AA or Equivalent SLP S3# SLP S5# OC0 OC1 Overcurrent Port 1 S3 Control Overcurrent Port 1 100?F Figure 1. USB Wakeup with Control Input 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 Micrel, Inc. ? 1849 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 944-0970 ? http://www.micrel.com 相关器件：MIC2012 MIC2072-2CQS

MIC2012CM

EEWorld咨询电话：82357002，82350740－8068 邮件咨询：datasheet@eeworld.com.cn

器件描述：USB Power Controller Advance Information
器件厂商：MICREL [Micrel Semiconductor]
厂商主页：http://www.micrel.com/
文件大小：56.4KB
文件页数：10
PDF阅读：MIC2012CM.pdf (点击阅读器件资料)

摘要：
September 2000 1 MIC2012/2072
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.
Typical Application
MIC2012P
V
BUS
D+
D–
GND
MAIN
AUX
OUT1
Downstream
USB
Port 1
100?F
5V MAIN
ATX Power Supply
S3#
FAULT1#
FAULT2#
V
BUS
D+
D–
GND
Downstream
USB
Port 2
OUT2
GND
5V STANDBY
82801AA or Equivalent
SLP S3#
SLP S5#
OC0
OC1
Overcurrent Port 1
S3 Control
Overcurrent Port 1
100?F
Figure 1. USB Wakeup with Control Input
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
Micrel, Inc. ? 1849 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 944-0970 ? http://www.micrel.com

相关器件：MIC2012 MIC2072-2CQS

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