MIC2090/MIC2091
Current Limiting Power
Distribution Switches
General Description
The MIC2090 and MIC2091 are high-side MOSFET power
switches optimized for general-purpose 50mA or 100mA
low power distribution in circuits requiring over-current
limiting and circuit protection. Typical applications for these
parts are for 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.
The MIC2090 and MIC2091 come in two versions: auto-
retry current limit and output latch off on an over current
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.
Data sheets and support documentation can be found on
Micrel’s web site at:
www.micrel.com.
Features
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1.8V to 5.5V supply voltage
790 mΩ typical R
DSON
at 3.3V
MIC2090 is rated for 50mA minimum continuous current
MIC2091 is rated for 100mA minimum continuous
current
Reverse current blocking (OGI)
20ns super fast reaction time to hard short at output
10ms fault flag delay (t
D_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: over-current, over-
temperature, or UVLO
Under-voltage lockout (UVLO)
Low quiescent current
USB peripherals
Camcorder
DSC
MP3/iPod
SD protection
USB low-power hub
Applications
_________________________________________________________________________________________________________________________
Typical Application
MIC2091 USB Power Switch
Startup into Short Circuit
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
July 2011
M9999-070611-B
Micrel, Inc.
MIC2090/MIC2091
Ordering Information
Part Number
MIC2090-1YM5
MIC2091-1YM5
MIC2090-2YM5
MIC2091-2YM5
Marking
L1K
M1K
L2K
M2K
Current
Limit
50mA
100mA
50mA
100mA
Current-Limit
Recovery
Auto-Retry
Auto-Retry
Latch-Off
Latch-Off
Junction Temperature
Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
Pin Configuration
5-Pin SOT-23 (M5)
Pin Description
Pin Number
1
2
3
Pin Name
VIN
GND
EN
Pin Function
Supply (Input): +1.8V to +5.5V. Provides power to the output switch and the MIC2090/MIC2091
internal control circuitry.
Ground.
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.
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
4
FAULT/
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.
July 2011
2
M9999-070611-B
Micrel, Inc.
MIC2090/MIC2091
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .....................................
−0.3V
to
+6.0V
Output Voltage (V
OUT
). .................................
−0.3V
to
+6.0V
FAULT/ Pin Voltage (V
FAULT/
) .......................
−0.3V
to
+6.0V
FAULT/ Pin Current (I
FAULT/
) .......................................25mA
EN Pin Voltage (V
EN
)...........................
−0.3V
to (V
IN
+
0.3V)
Power Dissipation (P
D
) ..............................Internally Limited
Maximum Junction Temperature (T
J
)......................... 150°C
Storage Temperature (T
S
).........................
−65°C
to
+150°C
Lead Temperature (soldering, 10s)............................ 260°C
ESD HBM Rating
(3)
......................................................... 3kV
ESD MM Rating
(3)
.........................................................200V
Operating Ratings
(2)
Supply Voltage (V
IN
)..................................... +1.8V to +5.5V
Output Voltage (V
OUT
) .................................. +1.8V to +5.5V
EN Pin Voltage (V
EN
).............................................. 0V to V
IN
FAULT/ Pin Voltage (V
FAULT/
) .............................. 0V to 5.5V
FAULT/ Pin Current (I
FAULT/
) .........................................1mA
Ambient Temperature (T
A
) .......................... –40°C to +85°C
Junction Temperature (T
J
) ........................ –40°C to +125°C
Package Thermal Resistance
SOT23-5 (θ
JA
) ...............................................252.7°C/W
Electrical Characteristics
(4)
V
IN
= 5V; T
A
= 25°C,
bold
values indicate –40°C
≤
T
A
≤ +85°C,
unless noted.
Symbol
V
IN
I
VIN
Parameter
Input Voltage Range
Shutdown Current
Supply Current
Under-Voltage Lockout
Threshold
Under-Voltage Lockout
Threshold Hysteresis
Enable Logic Level High
(5)
Enable Logic Level Low
Enable Bias Current
Output Turn-On Delay
Output Turn-On Rise Time
Output Turn-Off Delay
Output Turn-Off Fall Time
(5)
Condition
Min.
1.8
Typ.
Max.
5.5
Units
V
µA
Power Input Supply
V
EN
≤
0.5V (switch off), V
OUT
= open
V
EN
≥
1.5V (switch on), V
OUT
= open
V
IN
rising
100
5
70
10
110
1.75
V
UVLO
V
UVLO_HYS
Enable Input
V
EN
I
EN
t
ON
t
R
t
OFF
t
F
Internal Switch
V
mV
V
IH (MIN)
V
IL (MAX)
V
EN
= 5V
R
L
= 500Ω, C
L
= 0.1µF See “Timing Diagrams”
R
L
= 500Ω, C
L
= 0.1µF See “Timing Diagrams”
R
L
= 500Ω, C
L
= 0.1µF See “Timing Diagrams”
R
L
= 500Ω, C
L
= 0.1µF See “Timing Diagrams”
MIC2090 V
IN
= 5.0V, I
OUT
= 50mA
MIC2090 V
IN
= 3.3V, I
OUT
= 50mA
MIC2090 V
IN
= 1.8V, I
OUT
= 50mA
MIC2091 V
IN
= 5.0V, I
OUT
= 100mA
MIC2091 V
IN
= 3.3V, I
OUT
= 100mA
MIC2091 V
IN
= 1.8V, I
OUT
= 100mA
1.5
0.5
0.1
215
5
125
115
700
790
1300
700
790
1300
10
1200
1200
1200
1200
V
µA
µs
µs
µs
µs
R
DSON
On Resistance R
DS(ON)
mΩ
Input-to-Output Leakage
Current (Forward leakage
Current)
MIC2090 and MIC2091, V
EN
≤
0.5V, (output
off), V
IN
= 5.5V, V
OUT
= 0V
μA
July 2011
3
M9999-070611-B
Micrel, Inc.
MIC2090/MIC2091
Electrical Characteristics
(4)
(Continued)
V
IN
= 5V; T
A
= 25°C,
bold
values indicate –40°C
≤
T
A
≤ +85°C,
unless noted.
Symbol
Parameter
Output to Input Leakage
Current (Reverse Leakage
Current)
Current Limit
MIC2090 @ V
OUT
= 4.5V
I
LIMIT
Current-Limit Threshold
MIC2090 @ V
OUT
= 0V
MIC2091 @ V
OUT
= 4.5V
MIC2091 @ V
OUT
= 0V
t
SC_RESP
Short-Circuit Response
Time
Time After Switch Shuts
Down From An Over-
Current Condition Before
It Tries To Turn On Again.
Error Flag Output Voltage
Time After Switch Comes
Into Current Limit Before
The PIN FAULT/ Is Pulled
Low.
Output voltage high (1mA Sinking)
When an over-current 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
T
AUTORESTART
.
FAULT/ is connected to V
IN
= 5V through 10kΩ
and 100pF in parallel. See “Timing Diagrams”
Short circuit applied to output after switch is
turned on, see “Timing Diagrams”. V
IN
= 3.3V.
30
50
50
100
100
75
100
150
175
20
100
150
200
250
ns
mA
Condition
MIC2090 and MIC2091, V
EN
≤
0.5V, (output
off), V
OUT
= 5.5V, V
IN
= 0V
Min.
Typ.
Max.
10
Units
µA
T
AUTORESTART
FAULT/ Flag
60
90
ms
0.4
V
t
D_FAULT/
5
10
20
ms
t
R_FAULT/
t
F_FAULT/
FAULT/ Rising Time
FAULT/ Falling Time
5
1
µs
µs
Reverse Voltage Protection (OGI)
OGI
Output Voltage Greater
Than Input Voltage (OGI)
If the output voltage is greater than the input
voltage by this amount, the part will shut down.
The enable pin must be recycled to reset.
Time that the output voltage can be greater
than the input voltage before the chip is shut
down.
T
J
Rising
T
J
Falling
85
mV
OGI
TIME
Thermal Protection
T
OVERTEMP
Notes:
1.
2.
3.
4.
5.
10
ms
Over-Temperature
Shutdown
150
140
°C
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Specification for packaged product only.
V
IL(MAX)
= Maximum positive voltage applied to the input which will be accepted by the device as a logic low.
V
IH(MIN)
= Minimum positive voltage applied to the input which will be accepted by the device as a logic high.
July 2011
4
M9999-070611-B
Micrel, Inc.
MIC2090/MIC2091
Timing Diagrams
Output Rise and Fall Times (t
R
, t
F
)
Switch Delay Time (t
ON
, t
OFF
)
July 2011
5
M9999-070611-B
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