MIC2010-2PBQS TR Micrel Inc, MIC2010-2PBQS TR Datasheet - Page 7

• Manufacturer Part Number: MIC2010-2PBQS TR
• Description: IC USB PWR CTRLR DUAL 16-QSOP
• Manufacturer: Micrel Inc

Specifications of MIC2010-2PBQS TR

• Controller Type: USB Power Controller
• Interface: USB
• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 1mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: MIC2010-2PBQSTR; MIC2010-2PBQSTR

Functional Diagram
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 500mΩ MOSFET 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 100mΩ MOSFET
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
P
internal MOSFETs and I
Total power dissipation of the device will be the summation of
P
the following equation can be used:
January 2005
MIC2010/2070
D
D
= R
for both channels. To relate this to junction temperature,
DS(on)
× I
OUT
2
where R
S3#
EN
OUT
*MIC2070-1/2 Only
is the continuous output current.
DS(on)
is the on-resistance of the
To Other Channel
Charge Pump
Gate Control
Thermal
Sense
+
Latch
7
where:
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/R
R
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 t
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
SET
Current
Limit
Timer
10ms
is the resistance connected between the RSET pin and
TJ = P
T
T
θ
JA
J
A
= junction temperature
= ambient temperature
MAIN
= is the thermal resistance of the package
MAIN
FET
AUX
FET
D
Current
Limit
× θ
JA
AUX
*
+ T
A
OUT
AUX
RSET
/FAULT
* 'P' options only
SET
M9999-101104
ohms where
DLY
Micrel
the