MIC2026A/2076A
Dual-Channel Power Distribution Switch
General Description
The MIC2026A and MIC2076A are high-side MOSFET
switches optimized for general-purpose power distribution
requiring circuit protection. The MIC2026A is particularly
well suited for USB applications.
The MIC2026A/2076A are internally current limited and
have thermal shutdown that protects the device and load.
The MIC2076A offers “smart” shutdown that reduces
current consumption in fault modes. When the MIC2076A
goes into thermal shutdown due to current limiting, the
output is latched off until the switch is reset. The
MIC2076A can be reset by removing the load, toggling the
enable input, or cycling VIN.
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 or
thermal shutdown conditions. Transient faults are internally
filtered.
The MIC2026A/2076A are available in an 8-pin SOIC
package.
All support documentation can be found on Micrel’s web
site at
www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
100mΩ typical R
DS(ON)
at 5.0V
140mΩ maximum R
DS(ON)
at 5.0V
2.7 V to 5.5 V operating range
500mA minimum continuous current per channel
Short circuit protection with thermal shutdown
Thermally isolated channels
Soft-start circuit
Fault status flag with 3ms filter eliminates false
assertions
UVLO (Undervoltage lockout)
Reverse current flow blocking (no “body diode”)
Circuit breaker mode (MIC2076A)
Pin compatible with the MIC2026/2076
Logic-compatible inputs
Low quiescent current
Applications
•
USB peripherals
•
General purpose power switching
•
ACPI power distribution
•
Notebook PCs
•
PDAs
•
PC card hot swap
_______________________________________________________________________________________________
Typical Application
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 2009
M9999-072309-B
(408) 955-1690
Micrel, Inc.
MIC2026A/2076A
Ordering Information
Part Number
MIC2026A-1YM
MIC2026A-2YM
MIC2076A-1YM
MIC2076A-2YM
Enable
Active High
Active Low
Active High
Active Low
Temperature Range
–40° to +85°C
–40° to +85°C
–40° to +85°C
–40° to +85°C
Package
8- Pin SOIC
8- Pin SOIC
8- Pin SOIC
8- Pin SOIC
Lead Finish
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pin Configuration
ENA 1
FLGA 2
FLGB 3
ENB 4
8 OUTA
7 IN
6 GND
5 OUTB
8-Pin SOIC (M)
Pin Description
Pin Number
1
2
Pin Name
ENA
FLGA
Pin Function
Switch A Enable (Input): Logic-compatible, enable input. Active high (-1) or active low (-2).
Fault Flag A (Output): Active-low, open-drain output. A logic LOW state Indicates
overcurrent or thermal shutdown conditions. Overcurrent conditions must last longer than t
D
in order to assert FLGA. The FLGA pin can be left floating; however, fault reporting
information will be lost.
B
B
3
FLGB
Fault Flag B (Output): Active-low, open-drain output. A logic LOW state indicates
overcurrent or thermal shutdown conditions. Overcurrent conditions must last longer than t
D
in order to assert FLGB. The FLGB pin can be left floating; however, fault reporting
information will be lost.
B
B
4
5
6
7
8
ENB
OUTB
GND
IN
OUTA
Switch B Enable (Input): Logic-compatible enable input. Active-high (-1) or active-low (-2).
Switch B (Output).
Ground.
Input: Switch and logic supply input.
Switch A (Output).
July 2009
2
M9999-072309-B
(408) 955-1690
Micrel, Inc.
MIC2026A/2076A
Absolute Maximum Ratings
(1)
P
Operating Ratings
(2)
P
Supply Voltage (V
IN
) ....................................... –0.3V to +6V
Output Voltage (OUTA and OUTB) ................ –0.3V to +6V
All other pins voltages ..................................... –0.3V to +6V
Fault Flag Current (I
FLG
)..............................................25mA
Output Current (I
OUT
).................................Internally Limited
Storage Temperature (T
S
) .......................–65°C to +150 °C
ESD Rating
(3)
HBM ......................................................................... 3kV
MM .........................................................................200V
Lead Temperature (Soldering 10 sec) ....................... 260°C
B
B
B
B
B
B
Supply Voltage (V
IN
) .................................... +2.7V to +5.5V
Ambient Temperature (T
A
).......................... –40°C to +85°C
Junction Temperature Range (T
J
) ............ Internally Limited
Thermal Resistance
SOIC (θ
JA
) .......................................................160°C/W
B
B
B
B
B
B
B
B
Electrical Characteristics
(4)
V
IN
= 5V; T
A
= 25°C, unless noted,
bold
values indicate –40°C
≤
T
A
≤
+85°C.
Symbol
Parameter
Condition
MIC20X6A-1, V
ENA
= V
ENB
= 0V
(switch off), OUT = open
B
B
B
B
Min
Typ
0.75
0.75
100
100
1.6
Max
5
20
160
160
2.4
Units
µA
µA
µA
µA
V
V
mV
I
DD
B
B
Supply Current
MIC20X6A-2, V
ENA
= V
ENB
= 5V
(switch off), OUT = open
B
B
B
B
MIC20X6A-1, V
ENA
= V
ENB
= 5V
(switch on), OUT = open
B
B
B
MIC20X6A-2, V
ENA
= V
ENB
= 0V
(switch on), OUT = open
B
B
B
B
low-to-high transition
V
EN
B
B
Enable Input Threshold
high-to-low transition
0.8
1.45
150
V
EN
= 0V to 5V
B
B
V
EN_HYST
B
B
Enable Input Hysteresis
Enable Input Current
-1
I
EN
B
B
B
0.01
1
1
µA
pF
C
EN
B
Enable Input Capacitance
V
IN
= 5.0V, I
OUT
= 500mA
B
B
B
B
100
90
0.01
50
0.5
2.2
2.0
0.7
1.0
2.45
2.25
200
10
140
170
10
mΩ
mΩ
µA
µA
R
DS(ON)
B
B
Switch On Resistance
V
IN
= 3.3V, I
OUT
= 500mA
B
B
B
B
I
LEAKAGE
B
Output Leakage Current
Short-Circuit Output Current
Current-Limit Threshold
Undervoltage Lockout
Threshold (UVLO)
UVLO Hysteresis
Error Flag Output Resistance
MIC20X6A-1, V
ENX
= 0V;
MIC20X6A-2, V
ENX
= V
IN
, (output off)
MIC2076A, Thermal shutdown state
I
LIMIT
B
B
B
V
OUT
= 0V, enabled into short-circuit
B
B
1.25
1.25
2.7
2.5
25
10
A
A
V
V
mV
Ω
µA
µs
I
LMT_TRSH
V
UVLO
V
UVHYST
R
FLG
B
B
B
Ramped load applied to output
V
IN
rising
B
B
V
IN
falling
B
B
V
IN
rising or V
IN
falling
B
B
B
I
L
= 10mA
B
B
I
FLG_OFF
B
Error Flag Off Current
Short-Circuit Response Time
Output Turn-On Delay
Output Turn-On Rise Time
Output Turn-Off Delay
V
FLAG
= V
IN
B
B
B
B
B
B
t
SC_RESP
t
ON
B
B
V
OUT
= 0V,
short circuit applied to enabled switch
See Timing Diagrams,
R
L
= 10Ω, C
L
= 1µF
See Timing Diagrams,
R
L
= 10Ω, C
L
= 1µF
See Timing Diagrams,
R
L
= 10Ω, C
L
= 1µF
0.5
20
1.3
1.5
32
5
4.9
100
ms
ms
µs
t
R
B
B
B
t
OFF
B
July 2009
3
M9999-072309-B
(408) 955-1690
Micrel, Inc.
Symbol
t
F
B
B
MIC2026A/2076A
Parameter
Output Turn-Off Fall Time
Overcurrent Flag Response
Delay
Overtemperature Threshold
(5)
P
Condition
See Timing Diagrams,
R
L
= 10Ω, C
L
= 1µF
From short circuit to FLG pin assertion
T
J
increasing, each switch
T
J
decreasing, each switch
B
B
B
B
Min
Typ
32
Max
100
7
Units
µs
ms
°C
°C
°C
°C
t
D
1.5
3.5
140
120
160
150
T
OVERTEMP
P
T
J
increasing, both switches
T
J
decreasing, both switches
B
B
B
B
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function properly outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended.
4. Specification for packaged product only.
5. If there is a fault on one channel, that channel will shut down when the die reaches approximately 140°C. If the die reaches approximately 160°C,
both channels will shut down, even if neither channel is in current limit.
Test Circuit
July 2009
4
M9999-072309-B
(408) 955-1690
Micrel, Inc.
MIC2026A/2076A
Timing Diagrams
Output Rise and Fall Times
Active-Low Switch Delay Times (MIC20x6A-2)
Active-High Switch Delay Time (MIC20x6A-1)
July 2009
5
M9999-072309-B
(408) 955-1690
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