MIC2090/1
Current-Limiting Power Distribution Switches
Features
General Description
• 1.8V to 5.5V Supply Voltage
• 790 mΩ Typical RDS(ON) at 3.3V
• MIC2090 is Rated for 50 mA Minimum
Continuous Current
• MIC2091 is Rated for 100 mA Minimum
Continuous Current
• Reverse Current Blocking (OGI)
• 20 ns Super Fast Reaction Time to Hard Short at
Output
• 10 ms Fault Flag Delay (tD_FAULT/) Eliminates
False Assertions
• Auto-Retry Overcurrent and Short-Circuit
Protection (-1 Version)
• Latch-Off on Current-Limit (-2 Version)
• Thermal Shutdown
• Fault Status Flag Indicates: Overcurrent,
Overtemperature, or UVLO
• Undervoltage Lockout (UVLO)
• Low Quiescent Current
The MIC2090 and MIC2091 are high-side MOSFET
power switches optimized for general purpose 50 mA
or 100 mA low power distribution in circuits that require
overcurrent limiting and circuit protection. Typical
applications for these parts include switching power in
USB ports, portable consumer items, camera and
camcorder motor protection, thermal printer head
protection, and many other low current-load switching
applications.
Applications
•
•
•
•
•
•
USB Peripherals
Camcorder
DSC
MP3/iPod
SD Protection
USB Low-Power Hub
2021 Microchip Technology Inc. and its subsidiaries
The MIC2090 and MIC2091 come in two versions:
auto-retry current-limit and output latch off on an
overcurrent fault. The MIC2090 and MIC2091 are
offered in a space saving 5-pin SOT-23 package with
an operating junction temperature range of –40°C to
+125°C.
Package Type
MIC2090/1
5-Lead SOT-23 (M5)
VIN 1
5 VOUT
GND 2
EN 3
4 FAULT/
DS20006611A-page 1
MIC2090/1
Typical Application Circuit
MIC2090/1
5V BUS
10μF
USB CONTROLLER
VIN
OVER
CURRENT/
ON/OFF
Nȍ
D+
MIC2091
FAULT/
VIN
DVBUS
VOUT
EN
GND
USB
PORT
10μF
GND
Functional Block Diagram
DS20006611A-page 2
2021 Microchip Technology Inc. and its subsidiaries
MIC2090/1
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Supply Voltage (VIN) ................................................................................................................................. –0.3V to +6.0V
Output Voltage (VOUT) .............................................................................................................................. –0.3V to +6.0V
FAULT/ Pin Voltage (VFAULT/).................................................................................................................... –0.3V to +6.0V
FAULT/ Pin Current (IFAULT/) ...................................................................................................................................25 mA
EN Pin Voltage (VEN) .......................................................................................................................–0.3V to (VIN + 0.3V)
Power Dissipation (PD) .......................................................................................................................... Internally Limited
ESD Rating (HBM) (Note 1) ....................................................................................................................................... 3 kV
ESD Rating (MM) (Note 1) ........................................................................................................................................200V
Operating Ratings ‡
Supply Voltage (VIN) ................................................................................................................................. +1.8V to +5.5V
Output Voltage (VOUT) .............................................................................................................................. +1.8V to +5.5V
EN Pin Voltage (VEN) ..........................................................................................................................................0V to VIN
FAULT/ Pin Voltage ........................................................................................................................................ 0V to +5.5V
FAULT/ Pin Current ...................................................................................................................................................1 mA
† Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at those or any other conditions above those indicated
in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended
periods may affect device reliability.
‡ Notice: The device is not guaranteed to function outside its operating ratings.
Note 1: Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5 kΩ in series with
100 pF.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics: VIN = 5V; TA = +25°C, bold values indicate –40°C ≤ TA ≤ +85°C, unless noted. Note 1
Parameter
Symbol
Min.
Typ.
Max.
Units
VIN
1.8
—
5.5
V
—
5
10
—
70
110
Conditions
Power Input Supply
Input Voltage Range
Shutdown Current
Supply Current
IVIN
µA
Undervoltage Lockout
Threshold
VUVLO
—
—
1.75
V
Undervoltage Lockout
Threshold Hysteresis
VUVLO_HYS
—
100
—
mV
—
VEN ≤ 0.5V (switch off),
VOUT = open
VEN ≥ 1.5V (switch on),
VOUT = open
VIN rising
—
Enable Input
Enable Logic Level High
Enable Logic Level Low
Enable Current Bias
Output Turn-On Delay
Output Turn-On Rise Time
Output Turn-Off Delay
VEN
IEN
1.5
—
—
—
—
0.5
—
0.1
—
V
VIH(MIN), Note 2
VIL(MAX), Note 2
µA
VEN = 5V
tON
—
215
—
µs
RL = 500Ω, CL = 0.1 µF See Timing
Diagrams.
tR
—
5
—
µs
RL = 500Ω, CL = 0.1 µF See Timing
Diagrams.
tOFF
—
125
—
µs
RL = 500Ω, CL = 0.1 µF See Timing
Diagrams.
2021 Microchip Technology Inc. and its subsidiaries
DS20006611A-page 3
MIC2090/1
ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Characteristics: VIN = 5V; TA = +25°C, bold values indicate –40°C ≤ TA ≤ +85°C, unless noted. Note 1
Parameter
Output Turn-Off Fall Time
Symbol
Min.
Typ.
Max.
Units
tF
—
115
—
µs
Conditions
RL = 500Ω, CL = 0.1 µF See Timing
Diagrams.
Internal Switch
On-Resistance
RDS(ON)
—
700
1200
—
790
1200
—
1300
—
—
700
1200
—
790
1200
MIC2091 VIN = 3.3V, IOUT = 100 mA
—
1300
—
MIC2091 VIN = 1.8V, IOUT = 100 mA
MIC2090 VIN = 5.0V, IOUT = 50 mA
MIC2090 VIN = 3.3V, IOUT = 50 mA
mΩ
MIC2090 VIN = 1.8V, IOUT = 50 mA
MIC2091 VIN = 5.0V, IOUT = 100 mA
Input-to-Output Leakage
Current (Forward Leakage
Current)
—
—
—
10
µA
MIC2090 and MIC2091, VEN ≤
0.5V, (output off), VIN = 5.5V,
VOUT = 0V
Output-to-Input Leakage
Current (Reverse Leakage
Current)
—
—
—
10
µA
MIC2090 and MIC2091, VEN ≤
0.5V, (output off), VOUT = 5.5V,
VIN = 0V
50
75
100
Current-Limit
Current-Limit Threshold
Short-Circuit Response Time
Time After Switch Shuts Down
from an Overcurrent
Condition Before It Tries to
Turn on Again.
MIC2090 @ VOUT = 4.5V
50
100
150
100
150
200
100
175
250
tSC_RESP
—
20
—
ns
Short-circuit applied to output after
switch is turned on, see Timing
Diagrams. VIN = 3.3V.
tAUTO
30
60
90
ms
—
—
—
0.4
V
ILIMIT
RESTART
mA
MIC2090 @ VOUT = 0V
MIC2091 @ VOUT = 4.5V
MIC2091 @ VOUT = 0V
FAULT/ Flag
Error Flag Output Voltage
—
Sinking 1 mA
Time After Switch Comes into
Current-Limit before the Pin
FAULT/ is Pulled Low.
tD_FAULT/
5
10
20
ms
When an overcurrent condition
happens, the part will go into
constant output current for this
time. After this time, it will turn off
the output and pull low the pin
FAULT/. The MIC2090-1 and
MIC2091-1 will automatically restart
themselves after the auto restart
time tAUTORESTART.
FAULT/ Rising Time
tR_FAULT/
—
5
—
µs
FAULT/ is connected to VIN = 5V
through 10 kΩ and 100 pF in
parallel. See Timing Diagrams.
FAULT/ Falling Time
tF_FAULT/
—
1
—
µs
—
mV
If the output voltage is greater than
the input voltage by this amount,
the part will shut down. The enable
pin must be cycled to reset.
Reverse Voltage Protection (OGI)
Output Voltage Greater than
Input Voltage
DS20006611A-page 4
OGI
—
85
—
2021 Microchip Technology Inc. and its subsidiaries
MIC2090/1
ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Characteristics: VIN = 5V; TA = +25°C, bold values indicate –40°C ≤ TA ≤ +85°C, unless noted. Note 1
Parameter
Symbol
Min.
Typ.
Max.
Units
—
OGITIME
—
10
—
ms
TOVER-
—
150
—
—
140
—
Conditions
Time that the output voltage can be
greater than the input voltage
before the chip is shut down.
Thermal Protection
Overtemperature Shutdown
Note 1:
2:
TEMP
°C
TJ rising
TJ falling
Specification for packaged product only.
VIL(MAX) = Maximum positive voltage applied to the input that will be accepted by the device as a logic low.
VIH(MIN) = Minimum positive voltage applied to the input that will be accepted by the device as a logic high.
Timing Diagrams
tF
tR
90%
90%
VOUT
10%
10%
FIGURE 1-1:
VEN
Output Rise and Fall Times (tR, tF).
50%
50%
tON
tOFF
90%
VOUT
10%
FIGURE 1-2:
Switch Delay Time (tON, tOFF).
2021 Microchip Technology Inc. and its subsidiaries
DS20006611A-page 5
MIC2090/1
TEMPERATURE SPECIFICATIONS (Note 1)
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
TJ
–65
—
+150
°C
—
Junction Operating Temperature Range
TJ
–40
—
+125
°C
—
Ambient Operating Temperature Range
TA
–40
—
+85
°C
—
Lead Temperature
—
—
—
+260
°C
Soldering, 5s
JA
—
252.7
—
°C/W
Temperature Ranges
Storage Temperature Range
Package Thermal Resistances
Thermal Resistance SOT-23
Note 1:
—
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable
junction temperature and the thermal resistance from junction to air (i.e., TA, TJ, JA). Exceeding the
maximum allowable power dissipation will cause the device operating junction temperature to exceed the
maximum +125°C rating. Sustained junction temperatures above +125°C can impact the device reliability.
DS20006611A-page 6
2021 Microchip Technology Inc. and its subsidiaries
MIC2090/1
2.0
Note:
TYPICAL PERFORMANCE CURVES
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
FIGURE 2-1:
Input Voltage.
VIN Shutdown Current vs.
FIGURE 2-4:
Input Voltage.
MIC2090 Current-Limit vs.
FIGURE 2-2:
Voltage.
VIN Supply Current vs. Input
FIGURE 2-5:
Input Voltage.
MIC2090 FAULT/ Delay vs.
FIGURE 2-3:
Voltage.
Enable Thresholds vs. Input
FIGURE 2-6:
vs. Input Voltage.
MIC2090 Auto-Reset Time
2021 Microchip Technology Inc. and its subsidiaries
DS20006611A-page 7
MIC2090/1
FIGURE 2-7:
Input Voltage.
MIC2091 Current-Limit vs.
FIGURE 2-10:
Voltage.
Output Rise Time vs. Input
FIGURE 2-8:
Input Voltage.
Switch On-Resistance vs.
FIGURE 2-11:
Input Voltage.
Output Turn-Off Delay vs.
FIGURE 2-9:
Input Voltage.
Output Turn-On Delay vs.
FIGURE 2-12:
Voltage.
Output Fall Time vs. Input
DS20006611A-page 8
2021 Microchip Technology Inc. and its subsidiaries
MIC2090/1
FIGURE 2-13:
Voltage.
OGI Threshold vs. Input
FIGURE 2-16:
Temperature.
VIN Supply Current vs.
FIGURE 2-14:
OGI Delay vs. Input Voltage.
FIGURE 2-17:
Temperature.
Enable Threshold vs.
FIGURE 2-15:
Temperature.
VIN Shutdown Current vs.
FIGURE 2-18:
Temperature.
MIC2090 Current-Limit vs
2021 Microchip Technology Inc. and its subsidiaries
DS20006611A-page 9
MIC2090/1
FIGURE 2-19:
Temperature.
MIC2090 Current-Limit vs.
FIGURE 2-22:
Temperature.
MIC2091 Current-Limit vs.
FIGURE 2-20:
Temperature.
MIC2090 FAULT/ Delay vs.
FIGURE 2-23:
Temperature.
MIC2091 Current-Limit vs.
FIGURE 2-21:
vs. Temperature.
MIC2090 Auto-Reset Time
FIGURE 2-24:
RDS(ON) vs. Temperature.
DS20006611A-page 10
2021 Microchip Technology Inc. and its subsidiaries
MIC2090/1
FIGURE 2-25:
Temperature.
Output Turn-On Delay vs.
FIGURE 2-28:
Temperature.
Output Fall Time vs.
FIGURE 2-26:
Temperature.
Output Rise Time vs.
FIGURE 2-29:
Temperature.
OGI Threshold vs.
FIGURE 2-27:
Temperature.
Output Turn-Off Delay vs.
FIGURE 2-30:
OGI Delay vs. Temperature.
2021 Microchip Technology Inc. and its subsidiaries
DS20006611A-page 11
MIC2090/1
VOUT
1V/div
VEN = VIN
VUTH = 1.35V
VLTH = 1.28V
VIN
0.2V/div
FIGURE 2-31:
Temperature.
VIN
1V/div
VOUT
1V/div
VIN UVLO Thresholds vs.
Time (100ms/div)
FIGURE 2-34:
UVLO Thresholds.
FIGURE 2-35:
Enable Turn-On/Turn-Off.
VEN = VIN = 1.8V
CL = 10μF
IOUT = 50mA
VFAULT/
1V/div
IIN
50mA/div
FIGURE 2-32:
Time (400μs/div)
VIN Turn-On.
VEN = VIN = 5V
CL = 10μF
IOUT = 50mA
VIN
2V/div
VOUT
2V/div
CL = 0.1μF
CL = 0.1μF
VOUT
5V/div
VFAULT/
2V/div
IIN
50mA/div
FIGURE 2-33:
DS20006611A-page 12
VEN
2V/div
CL = 10μF
VIN = 5.5V
RL
CL = 0.1μF, 1μF, 10μF
Time (4ms/div)
VIN Turn-Off.
Time (200ms/div)
FIGURE 2-36:
Rise Time.
Enable Turn-On Delay and
2021 Microchip Technology Inc. and its subsidiaries
MIC2090/1
VIN = 1.8V
tD_FAULT/ = 7.52ms
VEN
2V/div
VOUT
1V/div
CL = 10μF
VOUT
5V/div
VFAULT/
2V/div
CL = 0.1μF
CL = 1μF
VIN = 5.5V
RL
CL = 0.1μF, 1μF, 10μF
Time (400ms/div)
FIGURE 2-37:
Fall Time.
Enable Turn-Off Delay and
IIN
50mA/div
FIGURE 2-40:
Stepped Short.
Time (10ms/div)
Current-Limit Response,
VIN = 5.5V
VOUT
2V/div
VFAULT/
5V/div
IIN
50mA/div
FIGURE 2-38:
Current-Limit Response,
Enabled into Short.
VIN
5V/div
VOUT
20mV/div
VIN = 5.5V
tD_FAULT/ = 7.24ms
FIGURE 2-41:
Current-Limit Response,
Stepped Overcurrent.
VIN = 5V
COUT = 10μF
IOUT = 50mA
VSHORT
5V/div
VOUT
5V/div
VFAULT/
5V/div
tAUTORESTART
IOUT
50mA/div
Time (20ms/div)
FIGURE 2-39:
(-1 Version).
Time (20ms/div)
Power-Up into Short-Circuit
2021 Microchip Technology Inc. and its subsidiaries
VFAULT/
5V/div
IOUT
50mA/div
Time (10ms/div)
FIGURE 2-42:
Output Recovery from
Short-Circuit and FAULT/ Response (-1 Version).
DS20006611A-page 13
MIC2090/1
VEN
2V/div
VIN
5V/div
CL = 47μF
VOUT
5V/div
VFAULT/
5V/div
VIN = 5.5V
IOUT = 50mA
IIN
50mA/div
VOUT
2V/div
FIGURE 2-43:
Output Recovery from
Thermal Shutdown and FAULT/ Response.
VFAULT/
5V/div
FIGURE 2-46:
VEN
2V/div
VIN = 5.5V
TURN-OFF WHEN VOUT 1.8V (-1 Version).
DS20006611A-page 14
CURRENT LIMIT TIME EXCEEDS
tD_FAULT/ AND OUTPUT TURNS OFF
WHEN CL = 100μF
VOUT
2V/div
VFAULT/
5V/div
FIGURE 2-44:
IOUT Current Limiting for
VOUT < 1.8V (-1 Version).
IIN
50mA/div
CL = 10μF
IIN
50mA/div
Time (200ms/div)
VOUT
1V/div
CL = 100μF
Time (10ms/div)
FIGURE 2-48:
VOUT > VIN, Enable into
Pre-Biased Output.
2021 Microchip Technology Inc. and its subsidiaries
MIC2090/1
VIN
5V/div
VOUT
5V/div
VFAULT/
5V/div
IOUT
500mA/div
VIN = 3.3V
VOUT = 5V
IOUT = 0mA
Time (10ms/div)
FIGURE 2-49:
VOUT > VIN, VIN Turn-On
into Pre-Biased Output.
VIN
5V/div
VOUT
2V/div
VFAULT/
5V/div
IOUT
500mA/div
VIN = 3.3V
VOUT = 5V
IOUT = 0mA
Time (10ms/div)
FIGURE 2-50:
While Running.
Increase VOUT Above VIN
IDC = 10mA
ILDO = 1mA
VIN = 3.6V
VEN
(1V/div)
VOUT
(1V/div)
IOUT
(50mA/div)
VFAULT/
(2V/div)
Time (200ms/div)
FIGURE 2-51:
Overcurrent Latch-Off and
Recovery (-2 Version).
2021 Microchip Technology Inc. and its subsidiaries
DS20006611A-page 15
MIC2090/1
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
PIN FUNCTION TABLE
Pin Number
Pin Name
1
VIN
Supply (Input): +1.8V to +5.5V. Provides power to the output switch and the
MIC2090/MIC2091 internal control circuitry.
2
GND
Ground.
3
EN
4
FAULT/
Fault Status (Output): Open-drain output. Can be connected to other open-drain
outputs. Must be pulled high with an external resistor.
When EN = 0, FAULT/ pin is high
When EN = 1, a low on the FAULT/ pin indicates one or more of the following
conditions:
1. The part is in current limit and is turned off.
2. The part is in thermal limit and is turned off.
3. The part is in UVLO
5
VOUT
Switched Output (Output): The voltage on this pin is controlled by the internal switch.
Connect the load driven by the MIC2090/MIC2091 to this pin.
DS20006611A-page 16
Description
Enable (Input): Active-high TTL compatible control input. A high signal turns on the
internal switch and supplies power to the load. This pin cannot be left floating.
2021 Microchip Technology Inc. and its subsidiaries
MIC2090/1
4.0
FUNCTIONAL DESCRIPTION
4.1
VIN and VOUT
VIN is both the power supply connection for the internal
circuitry driving the switch and the input (source
connection) of the power MOSFET switch. VOUT is the
drain connection of the power MOSFET and supplies
power to the load. In a typical circuit, current flows from
VIN to VOUT toward the load.
4.4
The part may enter current limit when turning on with a
large output capacitance, which is an acceptable
condition. However, if the part remains in current limit
for a time greater than tD_FAULT, the FAULT/ pin will
assert low. The maximum value of COUT may be
approximated by Equation 4-1.
EQUATION 4-1:
I LIMIT MIN t D_FAULT(MIN)
C OUT MAX = --------------------------------------------------------------------V IN MAX
When the switch is disabled, current will not flow to the
load, except for a small unavoidable leakage current of
a few microamps (forward leakage current).
4.2
CIN
A minimum 1 μF bypass capacitor positioned close to
the VIN and GND pins of the switch is both good design
practice and required for proper operation of the switch.
This will control supply transients and ringing. Without
a sufficient bypass capacitor, large current surges or a
short may cause sufficient ringing on VIN (from supply
lead inductance) to cause erratic operation of the
switch’s control circuitry. For best performance, place a
ceramic capacitor next to the IC.
An additional 10 µF (or greater) capacitor, positioned
close to the VIN and GND pins of the switch is
necessary if the distance between a larger bulk
capacitor and the switch is greater than three inches.
This additional capacitor limits input voltage transients
at the switch caused by fast changing input currents
that occur during a fault condition, such as current limit
and thermal shutdown.
When bypassing with capacitors of 10 μF or more, it is
good practice to place a smaller value capacitor in
parallel with the larger to handle the high-frequency
components of any line transients. Values in the range
of 0.1 μF to 1 μF are recommended. Again, good
quality, low-ESR capacitors, preferably ceramic, should
be chosen.
4.3
COUT
An output capacitor is required to reduce ringing and
voltage sag on the output during a transient condition.
A value between 1 μF and 10 μF is recommended.
A 10 μF or larger capacitor should be used if the
distance between the MIC2090/MIC2091 and the load
is greater than three inches. The internal switch in the
MIC2090/MIC2091 turns off in (typically) 20 ns. This
extremely fast turn-off can cause an inductive spike in
the output voltage when the internal switch turns off
during an overcurrent condition. The larger value
capacitor prevents the output from glitching too low.
2021 Microchip Technology Inc. and its subsidiaries
Limitations on COUT
Where:
ILIMIT(MIN) = The minimum specified value in the Electrical
Characteristics table.
tD_FAULT(MIN) = The minimum specified value in the
Electrical Characteristics table.
VIN(MAX) = The maximum input voltage to the switch.
4.5
Current Sensing and Limiting
The MIC2090/MIC2091 protects the system power
supply and load from damage by continuously
monitoring current through the on-chip power
MOSFET. Load current is monitored by means of a
current mirror in parallel with the power MOSFET
switch. Current limiting is invoked when the load
exceeds the overcurrent threshold. When current
limiting is activated in the -1 version, the output current
is constrained to the limit value, and remains at this
level until either the load/fault is removed, the load’s
current requirement drops below the limiting value, or
the switch goes into thermal shutdown. If the
overcurrent fault is large enough to drop VOUT below
(typically) 1.8V, the internal MOSFET turns off very
quickly (typically 20 ns). This prevents excessive
current from flowing through the device and damaging
the internal MOSFET.
The latch-off feature of the -2 version latches the output
off when the output current exceeds the overcurrent
threshold. VIN or the enable pin must be toggled to
reset the latch.
4.6
Enable Input
The EN pin is a TTL logic level compatible input that
turns the internal MOSFET switch on and off. The
FAULT/ pin remains high when the EN pin is pulled low
and the output is turned off. Toggling the enable pin
resets the output after an OGI (output greater than
input) condition occurs. In the -2 version, toggling the
enable pin resets the output after an overcurrent event.
DS20006611A-page 17
MIC2090/1
Fault/Output
The FAULT/ is an N-channel open-drain output that is
asserted LOW when the MIC2090/MIC2091 switch
either begins current-limiting or enters thermal
shutdown.
During an overcurrent or short-circuit event, the
FAULT/ signal asserts after a brief delay period,
tD_FAULT/, in order to filter out false or transient
overcurrent conditions.
The FAULT/ output is open-drain and must be pulled
high with an external resistor. The FAULT/ signal may
be wire-OR’d with other similar outputs, sharing a
single pull-up resistor.
4.8
Power Dissipation and Thermal
Shutdown
Thermal shutdown is used to protect the
MIC2090/MIC2091 switch from damage should the die
temperature exceed a safe operating temperature.
Thermal shutdown shuts off the output MOSFET and
asserts the FAULT/ output if the die temperature
reaches the overtemperature threshold, TOVERTEMP.
The switch will automatically resume operation when
the die temperature cools down to 140°C. If resumed
operation results in reheating of the die, another
shutdown cycle will occur and the switch will continue
cycling between ON and OFF states until the reason for
the overcurrent condition has been resolved.
Depending upon the PCB layout, package type,
ambient temperature, etc., hundreds of milliseconds
may elapse from the time a fault occurs to the time the
output MOSFET will be shut off. This delay is caused
because of the time it takes for the die to heat after the
fault condition occurs.
Power dissipation depends on several factors such as
the load, PCB layout, ambient temperature, and supply
voltage. Calculation of power dissipation can be
accomplished by Equation 4-2.
EQUATION 4-2:
P D = R DS ON I OUT
2
To relate this to junction temperature, Equation 4-3 can
be used.
EQUATION 4-3:
T J = P D R JA + T A
Where:
TJ = Junction temperature.
TA = Ambient temperature.
Rθ(JA) = Thermal resistance of the package.
DS20006611A-page 18
In normal operation, excessive switch heating is most
often caused by an output short-circuit. If the output is
shorted, when the switch is enabled, the
MIC2090/MIC2091 switch limits the output current to
the maximum value. The heat generated by the power
dissipation of the switch continuously limiting the
current may exceed the package and PCB’s ability to
cool the device and the MIC2090/MIC2091 will shut
down and signal a fault condition. Please see the “Fault
Output” description for more details on the FAULT/
output.
After the MIC2090/MIC2091 shuts down, and cools, it
will re-start itself if the enable signal remains true.
In Figure 4-1, die temperature is plotted against IOUT
assuming a constant ambient temperature of +85°C
and a worst case internal switch on-resistance (RON).
This plot is valid for both the MIC2090 and MIC2091.
DIE TEMPERATURE (°C)
4.7
90
89
88
87
86
85
84
83
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.1
IOUT (A)
FIGURE 4-1:
4.9
Die Temperature vs. IOUT.
ILIMIT vs. IOUT Measured (-1
Version Only)
When the MIC2090/MIC2091 is current-limiting, it is
designed to act as a constant current source to the
load. As the load tries to pull more than the maximum
current, VOUT drops and the input to output voltage
differential increases. When VOUT drops below 1.8V,
the output switch momentarily turns off to ensure the
internal MOSFET switch is not damaged by a very fast
short-circuit event.
When measuring IOUT in an overcurrent condition, it is
important to remember voltage dependence, otherwise
the measurement data may appear to indicate a
problem when one does not really exist. This voltage
dependence is illustrated in Figure 4-2 and Figure 4-3.
In Figure 4-2, output current is measured as VOUT is
pulled below VIN, with the test terminating when VOUT
is 2.5V below VIN. Observe that once ILIMIT is reached,
IOUT remains constant throughout the remainder of the
test.
Figure 4-3 repeats this test, but simulates operation
deeper into an overcurrent condition. When VOUT
drops below 1.8V, the switch turns off for a few
microseconds before turning back on.
2021 Microchip Technology Inc. and its subsidiaries
MIC2090/1
specified in the Electrical Characteristics table as
OGITIME. The FAULT/ pin remains high during and after
an OGI event.
Figure 4-4 shows the output voltage, input current, and
FAULT/ pin voltage when the output voltage is raised
above the input. Reverse current flows through the
internal MOSFET switch for the OGITIME period, until
the internal MOSFET switch is turned off and the input
current goes to 0A.
VOUT
1V/div
IIN
50mA/div
Time (2ms/div)
FIGURE 4-2:
VOUT > 1.8V.
IOUT in Current-Limiting for
VOUT
2V/div
OGITIME
IIN
100mA/div
VFAULY/
2V/div
Time (4ms/div)
OUTPUT
TURNS OFF
FIGURE 4-4:
OGI Event.
VOUT
1V/div
IIN
50mA/div
Time (2ms/div)
FIGURE 4-3:
VOUT < 1.8V.
4.10
IOUT in Current-Limiting for
Undervoltage Lockout (UVLO)
The
MIC2090/MIC2091
switches
have
an
Undervoltage Lockout (UVLO) feature that will shut
down the switch in a reproducible way when the input
power supply voltage goes too low. The UVLO circuit
disables the output until the supply voltage exceeds the
UVLO threshold. Hysteresis in the UVLO circuit
prevents noise and finite circuit impedance from
causing chatter during turn-on and turn-off. While
disable by the UVLO circuit, the output switch (power
MOSFET) is OFF and no circuit functions, such as
FAULT/ or EN, are considered to be valid or operative.
4.11
Output Greater than Input (OGI)
The internal MOSFET switch turns off when it senses
an output voltage that is greater than the input voltage.
This feature prevents continuous current from flowing
from the output to the input.
If the output voltage rises above VIN by the OGI
threshold voltage (typically 85 mV), the internal
MOSFET switch turns off after a period of time,
2021 Microchip Technology Inc. and its subsidiaries
DS20006611A-page 19
MIC2090/1
5.0
PACKAGING INFORMATION
5.1
Package Marking Information
5-Lead SOT-23*
Example
XXX
L1K
5-Lead SOT-23*
Example
NNN
240
(Front)
(Back)
Part Number
Marking
MIC2090-1YM5-TR
L1K
MIC2090-2YM5-TR
L2K
MIC2091-1YM5-TR
M1K
MIC2091-2YM5-TR
M2K
Legend: XX...X
Y
YY
WW
NNN
e3
*
Product code or customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC® designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
●, ▲, ▼ Pin one index is identified by a dot, delta up, or delta down (triangle
mark).
Note:
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information. Package may or may not include
the corporate logo.
Underbar (_) and/or Overbar (‾) symbol may not be to scale.
DS20006611A-page 20
2021 Microchip Technology Inc. and its subsidiaries
MIC2090/1
5-Lead SOT-23 Package Outline and Recommended Land Pattern
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging.
2021 Microchip Technology Inc. and its subsidiaries
DS20006611A-page 21
MIC2090/1
NOTES:
DS20006611A-page 22
2021 Microchip Technology Inc. and its subsidiaries
MIC2090/1
APPENDIX A:
REVISION HISTORY
Revision A (November 2021)
• Converted Micrel document MIC2090/1 to Microchip data sheet DS20006611A.
• Minor text changes throughout.
2021 Microchip Technology Inc. and its subsidiaries
DS20006611A-page 23
MIC2090/1
NOTES:
DS20006611A-page 24
2021 Microchip Technology Inc. and its subsidiaries
MIC2090/1
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office.
Device
-X
X
XX
-XX
Part No.
Current-Limit
Recovery
Junction
Temp. Range
Package
Media Type
Device:
MIC2090/MIC2091:Current-Limiting Power Distribution
Switches
Current-Limit
Recovery:
1
2
=
=
Auto-Retry
Latch-Off
Junction
Temperature
Range:
Y
=
–40°C to +125°C
Package:
M5
=
5-Lead SOT-23
Media Type:
TR
=
3,000/Reel
2021 Microchip Technology Inc. and its subsidiaries
Examples:
a) MIC2090-1YM5-TR:
MIC2090, Auto-Retry CurrentLimit Recovery, –40°C to
+125°C Temp. Range,
5-Lead SOT-23, 3,000/Reel
b) MIC2090-2YM5-TR:
MIC2090, Latch-Off CurrentLimit Recovery, –40°C to
+125°C Temp. Range,
5-Lead SOT-23, 3,000/Reel
c) MIC2091-1YM5-TR:
MIC2091, Auto-Retry CurrentLimit Recovery, –40°C to
+125°C Temp. Range,
5-Lead SOT-23, 3,000/Reel
d) MIC2091-2YM5-TR:
MIC2091, Latch-Off CurrentLimit Recovery, –40°C to
+125°C Temp. Range,
5-Lead SOT-23, 3,000/Reel
Note 1:
Tape and Reel identifier only appears in the
catalog part number description. This identifier is
used for ordering purposes and is not printed on
the device package. Check with your Microchip
Sales Office for package availability with the
Tape and Reel option.
DS20006611A-page 25
MIC2090/1
NOTES:
DS20006611A-page 26
2021 Microchip Technology Inc. and its subsidiaries
Note the following details of the code protection feature on Microchip products:
•
Microchip products meet the specifications contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is secure when used in the intended manner, within operating specifications, and
under normal conditions.
•
Microchip values and aggressively protects its intellectual property rights. Attempts to breach the code protection features of
Microchip product is strictly prohibited and may violate the Digital Millennium Copyright Act.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of its code. Code protection does not
mean that we are guaranteeing the product is “unbreakable”. Code protection is constantly evolving. Microchip is committed to
continuously improving the code protection features of our products.
This publication and the information herein may be used only
with Microchip products, including to design, test, and integrate
Microchip products with your application. Use of this information in any other manner violates these terms. Information
regarding device applications is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your
specifications. Contact your local Microchip sales office for
additional support or, obtain additional support at https://
www.microchip.com/en-us/support/design-help/client-supportservices.
THIS INFORMATION IS PROVIDED BY MICROCHIP "AS IS".
MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED,
WRITTEN OR ORAL, STATUTORY OR OTHERWISE,
RELATED TO THE INFORMATION INCLUDING BUT NOT
LIMITED TO ANY IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTABILITY, AND FITNESS FOR A
PARTICULAR PURPOSE, OR WARRANTIES RELATED TO
ITS CONDITION, QUALITY, OR PERFORMANCE.
IN NO EVENT WILL MICROCHIP BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL, OR CONSEQUENTIAL LOSS, DAMAGE, COST, OR EXPENSE OF ANY
KIND WHATSOEVER RELATED TO THE INFORMATION OR
ITS USE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS
BEEN ADVISED OF THE POSSIBILITY OR THE DAMAGES
ARE FORESEEABLE. TO THE FULLEST EXTENT
ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON
ALL CLAIMS IN ANY WAY RELATED TO THE INFORMATION
OR ITS USE WILL NOT EXCEED THE AMOUNT OF FEES, IF
ANY, THAT YOU HAVE PAID DIRECTLY TO MICROCHIP
FOR THE INFORMATION.
Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to
defend, indemnify and hold harmless Microchip from any and
all damages, claims, suits, or expenses resulting from such
use. No licenses are conveyed, implicitly or otherwise, under
any Microchip intellectual property rights unless otherwise
stated.
Trademarks
The Microchip name and logo, the Microchip logo, Adaptec,
AnyRate, AVR, AVR logo, AVR Freaks, BesTime, BitCloud,
CryptoMemory, CryptoRF, dsPIC, flexPWR, HELDO, IGLOO,
JukeBlox, KeeLoq, Kleer, LANCheck, LinkMD, maXStylus,
maXTouch, MediaLB, megaAVR, Microsemi, Microsemi logo,
MOST, MOST logo, MPLAB, OptoLyzer, PIC, picoPower,
PICSTART, PIC32 logo, PolarFire, Prochip Designer, QTouch,
SAM-BA, SenGenuity, SpyNIC, SST, SST Logo, SuperFlash,
Symmetricom, SyncServer, Tachyon, TimeSource, tinyAVR, UNI/O,
Vectron, and XMEGA are registered trademarks of Microchip
Technology Incorporated in the U.S.A. and other countries.
AgileSwitch, APT, ClockWorks, The Embedded Control Solutions
Company, EtherSynch, Flashtec, Hyper Speed Control, HyperLight
Load, IntelliMOS, Libero, motorBench, mTouch, Powermite 3,
Precision Edge, ProASIC, ProASIC Plus, ProASIC Plus logo, QuietWire, SmartFusion, SyncWorld, Temux, TimeCesium, TimeHub,
TimePictra, TimeProvider, TrueTime, WinPath, and ZL are
registered trademarks of Microchip Technology Incorporated in the
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Adjacent Key Suppression, AKS, Analog-for-the-Digital Age, Any
Capacitor, AnyIn, AnyOut, Augmented Switching, BlueSky,
BodyCom, CodeGuard, CryptoAuthentication, CryptoAutomotive,
CryptoCompanion, CryptoController, dsPICDEM, dsPICDEM.net,
Dynamic Average Matching, DAM, ECAN, Espresso T1S,
EtherGREEN, GridTime, IdealBridge, In-Circuit Serial
Programming, ICSP, INICnet, Intelligent Paralleling, Inter-Chip
Connectivity, JitterBlocker, Knob-on-Display, maxCrypto, maxView,
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Blocker, RTAX, RTG4, SAM-ICE, Serial Quad I/O, simpleMAP,
SimpliPHY, SmartBuffer, SmartHLS, SMART-I.S., storClad, SQI,
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ViewSpan, WiperLock, XpressConnect, and ZENA are trademarks
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SQTP is a service mark of Microchip Technology Incorporated in
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The Adaptec logo, Frequency on Demand, Silicon Storage
Technology, Symmcom, and Trusted Time are registered
trademarks of Microchip Technology Inc. in other countries.
GestIC is a registered trademark of Microchip Technology Germany
II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in
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All other trademarks mentioned herein are property of their
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© 2021, Microchip Technology Incorporated and its subsidiaries.
All Rights Reserved.
For information regarding Microchip’s Quality Management Systems,
please visit www.microchip.com/quality.
2021 Microchip Technology Inc. and its subsidiaries
ISBN: 978-1-5224-9279-5
DS20006611A-page 27
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DS20006611A-page 28
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