MIC2027/2077
Quad USB Power Distribution Switch
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 1 M9999-091506
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
• 150m 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 channel s
• 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. MIC2027/2077
September 2006 2 M9999-091506
Ordering Information(1)
Part Number
Standard Pb-Free
Enable Temperature Range Package
MIC2027-1BWM MIC2027-1YWM Active High –40°C to +85°C 16-Pin Wide SOIC
MIC2027-1BM MIC2027-1YM Active High –40°C to +85°C 16-Pin SOIC
MIC2027-2BWM MIC2027-2YWM Active Low –40°C to +85°C 16-Pin Wide SOIC
MIC2027-2BM MIC2027-2YM Active Low –40°C to +85°C 16-Pin SOIC
MIC2077-1BWM MIC2077-1YWM Active High –40°C to +85°C 16-Pin Wide SOIC
MIC2077-1BM MIC2077-1YM Active High –40°C to +85°C 16-Pin SOIC
MIC2077-2BWM MIC2077-2YWM Active Low –40°C to +85°C 16-Pin Wide SOIC
MIC2077-2BM MIC2077-2YM Active Low –40°C to +85°C 16-Pin SOIC
Pin Configur ation
16-Pin SOIC (M)
16-Pin Wide SOIC (WM)
Functional Pinout
Micrel, Inc. MIC2027/2077
September 2006 3 M9999-091506
Pin Description
Pin Number Pin Name Pin Function
1 FLG
Fault Flag A (Output): Active-low, open-drain output. Low indicates overcur r ent or thermal
shutdown conditions. Overcurrent conditions must last longer than t
D
to assert flag.
2 ENA Switch A Enable (Input): Logic-compatible enable input. Active high (-1) or active low (-2).
3 OUTA Switch A Output
4, 12 GND Ground
5 IN(C/D) Input: Channel C and D switch and logic supply input.
6 OUTC Switch C Output
7 ENC S witch C Enable (Input)
8 FLGC Fault Flag C (O utput)
9 FLGD Fault Flag D (O utput)
10 END Switch D Enable (Input)
11 OUTD Switch D Output
13 IN(A/B) Supply Input: Channel A and B switch and logic supply input.
14 OUTB Switch B Output
15 ENB Switch B Enable (Input)
16 FLGB Fault Flag B (Output)
Micrel, Inc. MIC2027/2077
September 2006 4 M9999-091506
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 Parameter Condition Min Typ Max Units
MIC20x7-1, V
ENA–D
0.8V
(switch off), OUT = open 1.5 10 µA
MIC20x7-2, V
ENA–D
2.4V
(switch off), OUT = open 1.5 10 µA
MIC20x7-1, V
ENA–D
2.4V
(switch on), OUT = open 200 320 µA
I
DD
Supply Current
MIC20x7-2, V
ENA–D
0.8V
(switch on), OUT = open 200 320 µA
low-to-high transition 1.7 2.4 V Enable Input Threshold high-to-low transition 0.8 1.45 V
V
EN
Enable Input Hysteresis 250 mV
Enable Input Current V
EN
= 0V to 5.5V –1 0.01 1 µA I
EN
Enable Input Capacitance 1 pF
V
IN
= 5V, I
OUT
= 500mA 100 150 m R
DS(on)
Switch Resistance V
IN
= 3.3V, I
OUT
= 500mA 110 180 m
Output Leakage Current MIC20x7-1, V
ENx
0.8V;
MIC20x7-2, V
ENx
2.4V, (output off)
10 µA
Output Current in
Latched Thermal Shutdown MIC2077 (per Latch Output)
(during thermal shutdown state) 50 µA
t
ON
Output Turn-On Delay RL = 10, CL = 1µF, see “Timing Di agrams” 1.3 5 ms
t
R
Output Turn-On Rise Time RL = 10, CL = 1µF, see “Timing Diagrams” 1.15 4.9 ms
t
OFF
Output Turnoff Delay RL = 10, CL = 1µF, see “Timing Diagrams” 35 100 µs
t
F
Output Turnoff Fall T ime RL = 10, CL = 1µF, see “Timing Diagrams” 32 100 µs
I
LIMIT
Short-Circuit Output Current V
OUT
= 0V, enabled into short-circuit 0.5 0.9 1.25 A
Current-Limit Threshold ramped load applied to out put 1.0 1.25 A
Short-Circuit Response Time V
OUT
= 0V to I
OUT
= I
LIMIT
(short applied to output) 20 µs
V
IN
= 5V, apply V
OUT
= 0V until FLG low 1.5 3 7 ms t
D
Overcurrent Flag Response
Delay V
IN
= 3.3V, apply V
OUT
= 0V until FLG low 3 ms
Micrel, Inc. MIC2027/2077
September 2006 5 M9999-091506
Symbol Parameter Condition Min Typ Max Units
V
IN
rising 2.2 2.4 2.7 V Undervoltage Lockout
Threshold V
IN
falling 2.0 2.15 2.5 V
I
L
= 10mA, V
IN
= 5V 10 25 Error Flag Output Resistance I
L
= 10mA, V
IN
= 3.3V 15 40
Error Flag Off Current V
FLAG
= 5V 10 µA
Overtemperature Threshold
Note 4 T
J
increasing, each switch
T
J
decreasing, each switch 140
120 °C
°C
T
J
increasing, both switches
T
J
decreasing, both switches 160
150 °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.
Micrel, Inc. MIC2027/2077
September 2006 6 M9999-091506
Test Circuit
Timing Diagrams
Output Rise and Fall Times
Active-Low Switch Delay Times (MIC20x7-2)
Active-High Switch Delay Times (MIC20x7-1)
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September 2006 7 M9999-091506
Typical Characteristics
Micrel, Inc. MIC2027/2077
September 2006 8 M9999-091506
Typical Characteristics (cont.)
Micrel, Inc. MIC2027/2077
September 2006 9 M9999-091506
Functional Characteristics
