MIC2027/2077
Quad USB Power Distribution Switch
General Description
The MIC2027 and MIC2077 are quad high-side MOSFET
switches optimized for general-purpose power distribution
requiring circuit protection. The MIC2027/77 are internally
current limited and have thermal shutdown that protects
the device and load.
The MIC2077 offers “smart” thermal shutdown that
reduces current consumption in fault modes. When a
thermal shutdown fault occurs, the output is latched off
until the faulty load is removed. Removing the load or
toggling the enable input will reset the device output.
Both devices employ soft-start circuitry that minimizes
inrush current in applications where highly capacitive loads
are employed.
A fault status output flag is asserted during overcurrent
and thermal shutdown conditions. Transient current limit
faults are internally filtered.
The MIC2027/77 are available in 16-pin narrow (150 mil)
and wide (300 mil) SOIC packages.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
150mΩ maximum on-resistance per channel
2.7V to 5.5V operating range
500mA minimum continuous current per channel
Short-circuit protection with thermal shutdown
Thermally isolated channels
Fault status flag with 3ms filter eliminates false
assertions
Undervoltage lockout
Reverse current flow blocking (no “body diode”)
Circuit breaker mode (MIC2077) reduces power
consumption
Logic-compatible inputs
Soft-start circuit
Low quiescent current
Pin compatible with MIC2524 and MIC2527
Applications
•
•
•
•
•
•
USB peripherals
General purpose power switching
ACPI power distribution
Notebook PCs
PDAs
PC card hot swap
Typical Application
®
UL Recognized Component
4-Port Self-Powered Hub
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
September 2006
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M9999-091506
Micrel, Inc.
MIC2027/2077
Ordering Information
(1)
Part Number
Standard
MIC2027-1BWM
MIC2027-1BM
MIC2027-2BWM
MIC2027-2BM
MIC2077-1BWM
MIC2077-1BM
MIC2077-2BWM
MIC2077-2BM
Pb-Free
MIC2027-1YWM
MIC2027-1YM
MIC2027-2YWM
MIC2027-2YM
MIC2077-1YWM
MIC2077-1YM
MIC2077-2YWM
MIC2077-2YM
Enable
Active High
Active High
Active Low
Active Low
Active High
Active High
Active Low
Active Low
Temperature Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Package
16-Pin Wide SOIC
16-Pin SOIC
16-Pin Wide SOIC
16-Pin SOIC
16-Pin Wide SOIC
16-Pin SOIC
16-Pin Wide SOIC
16-Pin SOIC
Pin Configuration
16-Pin SOIC (M)
16-Pin Wide SOIC (WM)
Functional Pinout
September 2006
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M9999-091506
Micrel, Inc.
MIC2027/2077
Pin Description
Pin Number
1
2
3
4, 12
5
6
7
8
9
10
11
13
14
15
16
Pin Name
FLG
ENA
OUTA
GND
IN(C/D)
OUTC
ENC
FLGC
FLGD
END
OUTD
IN(A/B)
OUTB
ENB
FLGB
Pin Function
Fault Flag A (Output): Active-low, open-drain output. Low indicates overcurrent or thermal
shutdown conditions. Overcurrent conditions must last longer than t
D
to assert flag.
Switch A Enable (Input): Logic-compatible enable input. Active high (-1) or active low (-2).
Switch A Output
Ground
Input: Channel C and D switch and logic supply input.
Switch C Output
Switch C Enable (Input)
Fault Flag C (Output)
Fault Flag D (Output)
Switch D Enable (Input)
Switch D Output
Supply Input: Channel A and B switch and logic supply input.
Switch B Output
Switch B Enable (Input)
Fault Flag B (Output)
September 2006
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M9999-091506
Micrel, Inc.
MIC2027/2077
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ............................................ –0.3V +6V
Fault Flag Voltage (V
FLG
)................................................+6V
Fault Flag Current (I
FLG
) ..............................................25mA
Output Voltage (V
OUT
) ....................................................+6V
Output Current (I
OUT
) .................................Internally Limited
Enable Input (I
EN
) .......................................... –0.3V V
IN
+3V
Lead Temperature (soldering, 5sec.)......................... 260°C
Storage Temperature (T
S
).........................–65°C to +150°C
EDS Rating
(3)
.................................................................. 1kV
Operating Ratings
(2)
Supply voltage (V
IN
) ..................................... +2.7V to +5.5V
Ambient Temperature (T
A
) .......................... –40°C to +85°C
Junction Thermal Range(T
J
) ..................... Internally Limited
Thermal Resistance
[300 mil] Wide SOIC (θ
JA
)................................120°C/W
[150 mil] SOIC (θ
JA
).........................................112°C/W
DIP (θ
JA
) ..........................................................130°C/W
Electrical Characteristics
V
IN
= +5V; T
A
= 25°C,
bold
values indicate –40°C< T
A
< +85°C, unless noted.
Symbol
I
DD
Parameter
Supply Current
Condition
MIC20x7-1, V
ENA–D
≤
0.8V
(switch off), OUT = open
MIC20x7-2, V
ENA–D
≥
2.4V
(switch off), OUT = open
MIC20x7-1, V
ENA–D
≥
2.4V
(switch on), OUT = open
MIC20x7-2, V
ENA–D
≤
0.8V
(switch on), OUT = open
V
EN
Enable Input Threshold
Enable Input Hysteresis
I
EN
R
DS(on)
Enable Input Current
Enable Input Capacitance
Switch Resistance
Output Leakage Current
Output Current in
Latched Thermal Shutdown
t
ON
t
R
t
OFF
t
F
I
LIMIT
Output Turn-On Delay
Output Turn-On Rise Time
Output Turnoff Delay
Output Turnoff Fall Time
Short-Circuit Output Current
Current-Limit Threshold
Short-Circuit Response Time
t
D
Overcurrent Flag Response
Delay
V
IN
= 5V, I
OUT
= 500mA
V
IN
= 3.3V, I
OUT
= 500mA
MIC20x7-1, V
ENx
≤
0.8V;
MIC20x7-2, V
ENx
≥
2.4V, (output off)
MIC2077 (per Latch Output)
(during thermal shutdown state)
RL = 10Ω, CL = 1µF, see “Timing Diagrams”
RL = 10Ω, CL = 1µF, see “Timing Diagrams”
RL = 10Ω, CL = 1µF, see “Timing Diagrams”
RL = 10Ω, CL = 1µF, see “Timing Diagrams”
V
OUT
= 0V, enabled into short-circuit
ramped load applied to output
V
OUT
= 0V to I
OUT
= I
LIMIT
(short applied to output)
V
IN
= 5V, apply V
OUT
= 0V until FLG low
V
IN
= 3.3V, apply V
OUT
= 0V until FLG low
1.5
0.5
50
1.3
1.15
35
32
0.9
1.0
20
3
3
7
5
4.9
100
100
1.25
1.25
V
EN
= 0V to 5.5V
–1
low-to-high transition
high-to-low transition
0.8
Min
Typ
1.5
1.5
200
200
1.7
1.45
250
0.01
1
100
110
150
180
10
1
Max
10
10
320
320
2.4
Units
µA
µA
µA
µA
V
V
mV
µA
pF
mΩ
mΩ
µA
µA
ms
ms
µs
µs
A
A
µs
ms
ms
September 2006
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M9999-091506
Micrel, Inc.
MIC2027/2077
Symbol
Parameter
Undervoltage Lockout
Threshold
Error Flag Output Resistance
Error Flag Off Current
Overtemperature Threshold
Note 4
Condition
V
IN
rising
V
IN
falling
I
L
= 10mA, V
IN
= 5V
I
L
= 10mA, V
IN
= 3.3V
V
FLAG
= 5V
T
J
increasing, each switch
T
J
decreasing, each switch
T
J
increasing, both switches
T
J
decreasing, both switches
Min
2.2
2.0
Typ
2.4
2.15
10
15
140
120
160
150
Max
2.7
2.5
25
40
10
Units
V
V
Ω
Ω
µA
°C
°C
°C
°C
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
4. If there is an output current limit fault on one channel, that channel will shut down when the die reaches approximately 140°C. If the diereaches
approximately 160°C, the other channel driven by the same input will shut down, even if neither channel is in current limit.
September 2006
5
M9999-091506
嵌入式系统
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