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MIC2070 PDF 데이터시트 ( Data , Function )

부품번호 MIC2070 기능
기능 USB Power Controller
제조업체 Micrel Semiconductor
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MIC2070 데이터시트, 핀배열, 회로
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




MIC2070 pdf, 반도체, 판매, 대치품
MIC2010/2070
Absolute Maximum Ratings (1, 4)
Supply Voltage (VIN) ........................................ –0.3V to 6V
FAULT#, OUT1, OUT2 Output Pins ................. –0.3V to 6V
FAULT1,FAULT2, Output Current .............................. 25mA
ESD Rating(3) ................................................................ 2kV
Micrel
Operating Ratings(2)
Supply Voltage (VMAIN, VAUX) ..................... +4.5V to +5.5V
Continuous Output Current (AUX Mode) .. 50mA to 300mA
Ambient Temperature (TA) ........................... –0°C to +70°C
Junction Temperature (TJ) ....................... Internally Limited
Package Thermal Resistance
QSOP(θJA) ........................................................ 163°C/W
Electrical Characteristics
VMAIN = 5V; AUX = 5V; RSET = 125, TA = 25°C.
Symbol
Parameter
VMAIN
IMAIN
MAIN Supply Voltage
MAIN Supply Current(5)
ILEAK
MAIN Reverse Leakage Current(5)
Condition
S3# = 1, both switches ON, no load
S3# = 1, both switches OFF, no load
S3# = 0, both switches ON, VMAIN = 0V
VAUX
IAUX
VUV/AUX
VHYS
RDSMAIN
RDSAUX
ILIMIT
VTH
IIN
VHYS
IOFF
VTH LATCH
VOL
AUX Supply Voltage
AUX Supply Current(5)
S3# = 0; No load, both switches ON
S3# = 0; No load, both switches OFF
AUX Undervoltage Lockout
Threshold
AUX Undervoltage Lockout
Hysteresis
VAUX increasing
VAUX decreasing
MAIN On-Resistance, Each Output
AUX On-Resistance, Each Output
MAIN Current-Limit Threshold,
MAIN Short-Circuit Current-Limit
Current-Limit Factor (AUX Supply)(6)
S3#, EN1, EN2
Input Threshold Voltage
S3# = 1, IOUT = 500mA
S3# = 0, IOUT = 100mA
S3# = 1, VOUT = 4.0V, ramped load
VOUT = 0V
S3# = 0, IOUT = 50mA to 300mA
VOUT = 4V
High-to-Low transition
Low-to-High transition
S3#, EN1, EN2 Input Current
VS3/EN =5V, 0V
EN1, EN2 and S3# Input Hysteresis
OUT1, 2 Leakage Current
Pull-Up Current During Latched
Output State (MIC2070-x only)
Outputs are off, VOUT = 0
Outputs latched off
Latch Reset Threshold
Minimum Output Slew Rate
to Reset Latch (MIC2070-x only)(7)
VOUT rising
Output rising
Overtemperature Threshold
FAULT1, 2 Output Low Voltage
FAULT1, 2 Output Off Current
(Not Applicable for 'P' versions)
TJ increasing, single channel
TJ decreasing, single channel
TJ increasing, both channels
TJ decreasing, both channels
IFAULT = 5mA
VFAULT = 5V
Min Typ Max Units
4.5 5.0 5.5
V
16 22 µA
5 µA
–10 +10 µA
4.5 5.0 5.5
V
.6 1 mA
5 µA
3.5 3.7 4.0
3.3 3.5 3.8
V
V
200 mV
100 140 m
500 700 m
0.5 1.25 A
0.5 1.25 A
14.4 18 21.6 A •
.8 1.5
V
1.7 2.0
V
–1 1 µA
200 mV
–10 10 µA
TBD 1 TBD mA
1.95 V
.4 V/s
140
120
160
125
0.2
0.2 10
°C
°C
°C
°C
V
µA
M9999-101104 4 January 2005

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MIC2070 전자부품, 판매, 대치품
MIC2010/2070
Functional Diagram
EN
S3#
MAIN
Current
Limit
Charge Pump
+
Gate Control
MAIN
FET
AUX
FET
Thermal
Sense
Current
Limit
OUT
AUX
RSET
Micrel
*MIC2070-1/2 Only
To Other Channel
Latch
10ms
Timer
AUX
*
* 'P' options only
/FAULT
Functional Description
The MIC2010/2070 are designed to support the power distri-
bution requirements for USB wakeup from the ACPI S3 state.
It integrates two independent channels under control of input
S3#. When S3# is asserted LOW (ACPI S3 state) the MIC2010/
2070 will switch a 500mMOSFET switch from the AUX
input to each of its two outputs. In addition the current-limit
threshold will be set to a value specified by a resistor
connected to the RSET inputs. Conversely when the S3#
input is HIGH the MIC2010/2070 will switch a 100mMOSFET
switch from the MAIN inputs to each of its two outputs. The
current-limit threshold is preset to 500mA in this state. The
lower current limit during the ACPI S3 state helps to ensure
that the standby supply maintains regulation even during fault
conditions.
Thermal Shutdown
Thermal shutdown is employed to protect the device from
damage should the die temperature exceed safe margins
due mainly to short circuit faults. Thermal shutdown shuts off
the output MOSFET and asserts the FAULT output if the die
temperature reaches 140°C and the overheated channel is in
current limit. The other channel is not affected. If however, the
die temperature exceeds 160°C, both channels will be shut
off even if neither channel is in current limit.
Power Dissipation
The device’s junction temperature depends on several fac-
tors such as the load, PCB layout, ambient temperature and
package type. The power dissipated in each channel is
PD = RDS(on) × IOUT2 where RDS(on) is the on-resistance of the
internal MOSFETs and IOUT is the continuous output current.
Total power dissipation of the device will be the summation of
PD for both channels. To relate this to junction temperature,
the following equation can be used:
TJ = PD × θJA + TA
where:
TJ = junction temperature
TA = ambient temperature
θJA = is the thermal resistance of the package
Current Sensing and Limiting
The current-limit threshold of each channel is preset inter-
nally at 500mA when S3# is deasserted. When S3# is
asserted the current-limit threshold is specified by a resistor
connected to the RSET input. The value of the current-limit
threshold is determined by the equation 18/RSET ohms where
RSET is the resistance connected between the RSET pin and
ground. The current-limit threshold should be set at 1.2X of
the applications continous output current requirement.
When an overcurrent condition lasts longer than tDLY the
MIC2070 will activate an internal circuit breaker that will latch
the output off and assert FAULT. The output will remain off
until either the load is removed or EN is toggled. When the
MIC2070 enters a latched output condition a 1mA pull-up
current source is activated. This provides a way to automati-
cally reset the output once the load is removed without the
need to toggle the enable input. Please refer to Figure 7 for
timing details.
The MIC2010 will automatically reset its output when the die
temperature cools down to 120°C. The MIC2010 output and
FAULT signal will continue to cycle on and off until the device
is disabled or the fault is removed. Figure 6 depicts typical
timing. Depending on PCB layout, package, ambient tem-
perature, etc., it may take several hundred milliseconds from
the incidence of the fault to the output MOSFET being shut
January 2005 7 M9999-101104

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