MIC2072-2CQS Micrel Semiconductor, MIC2072-2CQS Datasheet

no-image

MIC2072-2CQS

Manufacturer Part Number
MIC2072-2CQS
Description
USB Power Controller Advance Information
Manufacturer
Micrel Semiconductor
Datasheet
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
September 2000
MIC2012
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
82801AA or Equivalent
ATX Power Supply
5V STANDBY
5V MAIN
SLP S3#
SLP S5#
OC0
OC1
Overcurrent Port 1
Overcurrent Port 1
S3 Control
Figure 1. USB Wakeup with Control Input
MAIN
AUX
S3#
FAULT1#
FAULT2#
MIC2012P
GND
OUT2
OUT1
1
Features
• Compliant to USB power distribution specifications
• Two completely independent switches
• Integrated switching matrix supports ACPI S0/S3 state
• Make-before-break switching ensures glitch-free
• No back-feed of auxiliary supply onto main supply
• Bi-level current-limit preserves auxiliary supply voltage
• Thermally isolated channels
• Thermal shutdown protection
• Fault status outputs with filter prevents false assertions
• Latched thermal shutdown options with auto-reset
• Undervoltage lockout
Applications
• Desktop PCs
• Notebook PCs
• Notebook Docking stations
• LAN Servers
• PC Motherboards
transitions without external FET circuits
transitions
during standby mode
regulation in standby mode
during hot-plug events
(MIC2072)
100 F
MIC2012/MIC2072
100 F
USB Power Controller
Advance Information
GND
GND
V
V
BUS
D+
BUS
D–
D+
D–
Downstream
Downstream
Port 1
Port 2
USB
USB
MIC2012/2072
Micrel

Related parts for MIC2072-2CQS

MIC2072-2CQS Summary of contents

Page 1

... 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- removing the load ...

Page 2

... MIC2012-1CQS* Active High MIC2012-1PCQS* Active High MIC2012-2CQS* Active Low MIC2012-2PCQS* Active Low MIC2072CM* n/a MIC2072PCM* n/a MIC2072-1CQS* Active High MIC2072-1PCQS* Active High MIC2072-2CQS Active Low MIC2072-2PCQS* Active Low * Contact factory for availability. Pin Configuration FAULT1 1 S3# 2 AUX 3 GND 4 8-Pin SOIC (M) MIC2012/2072 Fault Circuit Breaker ...

Page 3

... Fault Status (Output): Internal pull-up or open-drain. Asserted LOW when Channel 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. ...

Page 4

... I S3#, EN1, EN2 Input Current IN (EN1, EN2, for MIC20x2-x only) I OUT1, OUT2 Leakage Current OFF (MIC2012-x, MIC2072-x only) Pull-Up Current During Latched Output State (MIC2072-1, -2) MIC2012/2072 Operating Ratings (Note 1, Note 4) Supply Voltage (V Ambient Temperature (T Junction Temperature (T Package Thermal Resistance QSOP SOIC ...

Page 5

... MIC2012 Symbol Parameter V Latch Reset Threshold TH LATCH (MIC2072, MIC2072-x only) Minimum Output Slew Rate to Reset Latch (MIC2072, MIC2072-x only), Note 6 Overtemperature Threshold V FAULT Output Low Voltage OL V FAULT Output High Voltage OH (MIC2012-1P,-2P),(MIC2072-1P,-2P) FAULT Output Off Current (Not Applicable to 'P' Options) ...

Page 6

MIC2012 Test Circuit V OUT MIC2012/2072 V OUT I Device OUT Under OUT Test 90% 90% 10% 10% 6 Micrel t f September 2000 ...

Page 7

MIC2012 Timing Diagrams OUT OUT V OUT I OUT FAULT# MAIN S3# 1.5V September 2000 50% t OFF t ON 90% Figure 2. MIC2012/72-1 50% t OFF t ON 90% Figure 3. MIC2012/72-2 Output ...

Page 8

... MIC2072. Please refer to Figure 7 for timing details. The MIC2012 will automatically reset its output when the die temperature cools down to 120 C. The MIC2012 output and FAULT signal will continue to cycle on and off until the device is disabled or the fault is removed ...

Page 9

... This helps to ensure that the power supply DLY voltage regulation is preserved and also prevents possible damage to sensitive components. Thermal Shutdown Figure 6. MIC2012 System Timing Load Removed– Figure 7. MIC2072 System Timing— Output Resets When Load is Removed 9 Overcurrent Fault Reached Overcurrent Fault Output Reset ...

Page 10

MIC2012 Package Information 0.157 (3.99) 0.150 (3.81) 0.009 (0.2286) REF 0.0098 (0.249) 0.0040 (0.102) SEATING 0.0688 (1.748) PLANE 0.0532 (1.351) 0.026 (0.65) 0.157 (3.99) 0.150 (3.81) 0.064 (1.63) 0.045 (1.14) MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA ...

Related keywords