MIC2073/2074
Dual-Channel Power Distribution Switch
General Description
The MIC2073/2074 are high-side MOSFET switches
optimized for general-purpose power distribution requiring
circuit protection.
The MIC2073/2074 are internally current limited and have
thermal shutdown for protecting the device and load.
The MIC2074 offers “smart” shutdown that reduces current
consumption in fault mode. When a fault occurs due to
thermal shutdown, the output is latched off.
The
MIC2074s’ output will be reset, enabling the output, either
by removing the load or toggling the ENABLE pin.
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 MIC2073/2074 are available in an 8-pin SOIC.
All support documentation can be found on Micrel’s web
site at:
www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
115 mΩ typical R
DS(ON)
at 5.0 V
210 mΩ maximum R
DS(ON)
at 5.0 V
2.7 V to 5.5 V operating range
500 mA minimum continuous current per channel
Short circuit protection with thermal shutdown
Thermally isolated channels
Fault status flag (FLGA/B) separate for each channel
3ms fault flag delay (T
D
) eliminates false assertions
UVLO (Undervoltage Lockout)
Reverse current flow blocking (no “body diode”)
Circuit breaker mode (MIC2074)
Logic-compatible inputs
Soft-start circuit
Low quiescent current
Pin compatible with the MIC2026/2076
B
B
Applications
•
USB peripherals
•
General purpose power switching
•
ACPI power distribution
•
Notebook PCs
•
PDAs
•
PC card hot swap
_________________________________________________________________________________________________
Typical Application
V
CONT.
10k
10k
Logic Controlle
r
VIN
ON/OFF
OVERCURRENT
OVERCURRENT
ON/OFF
MIC2073/74
ENA
FLGA
FLGB
ENB
OUTA
IN
GND
OUTB
Load
0.1µF
Load
V
CC
2.7V to 5.5V
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
January 2009
M9999-011209
Micrel, Inc.
MIC2073/2074
Ordering Information
Part Number
MIC2073-1YM
MIC2073-2YM
MIC2074-1YM
MIC2074-2YM
NOTE:
Enable
Active High
Active Low
Active High
Active Low
Package
8- Pin SOIC
1. MIC2073/2074 are Temperature rated from –40°C to +85°C
2. MIC2073/2074 are all lead free
Pin Configuration
ENA 1
FLGA 2
FLGB 3
ENB 4
8 OUTA
7 IN
6 GND
5 OUTB
8-Pin SOIC (M)
MIC2073/2074
Pin Description
Pin Number
1
Pin Name
ENA
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. Low indicates overcurrent
or thermal shutdown conditions. Overcurrent conditions must last longer than t
D
in order to assert FLGA. FLGA pin can be left floating; however, fault status
information will not be available.
B
B
2
FLGA
3
FLGB
Fault Flag B (Output): Active-low, open-drain output. Low indicates overcurrent
or thermal shutdown conditions. Overcurrent conditions must last longer than t
D
in order to assert FLGB. FLGB pin can be left floating; however, fault status
information will not be available.
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)
January 2009
2
M9999-011209
Micrel, Inc.
MIC2073/2074
Absolute Maximum Ratings
(1)
P
Operating Ratings
(2)
P
Supply Voltage (V
IN
) .................................... –0.3 V to +6 V
Fault Flag Voltage (V
FLG
) ..............................................+6 V
Fault Flag Current (I
FLG
).............................................25 mA
Output Voltage (V
OUT
) ...................................................+6 V
Output Current (I
OUT
).................................Internally Limited
Enable Input (V
EN
)...................................... –0.3 V to 6.0 V
Storage Temperature (T
S
) .....................–65°C to +150 °C
ESD Rating
(3)
HBM ........................................................................ 1 kV
MM ........................................................................200 V
B
B
B
B
B
B
B
B
B
B
B
B
B
B
Supply Voltage (V
IN
) ................................. +2.7 V to +5.5 V
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)
Symbol
Parameter
P
VIN = 5 V; TA = 25°C, bold values indicate –40°C
≤
TA
≤
+85°C; unless noted
Condition
MIC2073-1, V
ENA
= V
ENB
≤
0.8 V
(switch off), OUT = open
B
B
B
Min
B
Typ
0.40
7.5
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
MIC2073-2, V
ENA
= V
ENB
≥
2.4 V
(switch off), OUT = open
B
B
B
B
MIC2073-1, V
ENA
= V
ENB
≥
2.4 V
(switch on), OUT = open
B
B
B
B
MIC2073-2, V
ENA
= V
ENB
≤
0.8 V
(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
1.40
225
V
EN
= 0 V to 5.5 V
B
B
V
EN_HYST
B
B
Enable Input Hysteresis
Enable Input Current
Enable Input Capacitance
MIC2073/2074 ,
V
IN
= 5.0 V, I
OUT
= 500 mA
B
B
B
B
I
EN
B
B
-1
0.01
1
115
145
1
µA
pF
C
EN
R
DS(ON)
B
170
210
10
mΩ
mΩ
µA
µA
B
Switch Resistance
MIC2073/2074
Output Leakage Current
V
IN
= 3.3 V, I
OUT
= 500 mA
B
B
B
B
MIC2073-1/2074-1, V
ENx
≤
0.8 V;
MIC2073-2/2074-2, V
ENx
≥
2.4 V, (output off)
MIC2074, Thermal shutdown state
V
OUT
= 0V, enabled into short-circuit
B
B
Off Current
(Thermal Shutdown)
I
LIMIT
B
50
0.5
0.7
1.0
2.2
2.0
2.45
2.25
12
14
1.25
1.25
2.7
2.5
25
40
10
Short-Circuit Output Current
B
A
A
V
V
Ω
µA
Current-Limit Threshold
Undervoltage Lockout
Threshold
Error Flag Output Resistance
Error Flag Off Current
Ramped load applied to output
V
IN
rising
B
B
V
UVLO
V
IN
falling
B
B
I
L
= 10 mA, V
IN
= 5.0 V
B
B
B
B
I
L
= 10 mA, V
IN
= 3.3 V
B
B
B
B
V
FLAG
= V
IN
B
B
B
B
January 2009
3
M9999-011209
Micrel, Inc.
V
IN
= 5 V; T
A
= 25°C,
bold
values indicate –40°C
≤
T
A
≤
+85°C; unless noted (Continued)
Symbol
t
SC_RESP
t
ON
B
MIC2073/2074
Parameter
Short-Circuit Response Time
Output Turn-On Delay
Output Turn-On Rise Time
Output Turn-Off Delay
Output Turn-Off Fall Time
Overcurrent Flag Response
Delay
Condition
V
OUT
= 0 V, to I
OUT
= I
LIMIT
(short applied to output)
B
B
Min
Typ
20
1.3
Max
Units
µs
B
R
L
= 10
Ω,
C
L
= 1 µF, see “Timing
Diagrams”
B
B
B
B
5
4.9
100
100
7
ms
ms
µs
µs
ms
ms
°C
°C
°C
°C
t
R
B
B
R
L
= 10
Ω,
C
L
= 1 µF, see “Timing
Diagrams”
B
B
B
B
0.5
1.15
35
32
t
OFF
B
B
R
L
= 10
Ω,
C
L
= 1 µF, see “Timing
Diagrams”
B
B
B
B
t
F
B
B
R
L
= 10
Ω,
C
L
= 1 µF, see “Timing
Diagrams”
B
B
B
B
t
D
V
IN
= 5 V apply V
OUT
0 V until FLG LOW
V
IN
= 3.3 V apply V
OUT
0 V until FLG LOW
T
J
increasing, each switch
T
J
decreasing, each switch
B
B
B
B
1.5
4
3
140
120
160
150
T
OVERTEMP
Overtemperature Threshold
(5)
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 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.
January 2009
4
M9999-011209
Micrel, Inc.
MIC2073/2074
Test Circuit
V
OUT
Device
Under OUT
Test
R
L
C
L
Timing Diagrams
t
R
V
OUT
10%
Output Rise and Fall Times
t
F
90%
90%
10%
V
EN
50%
t
OFF
t
ON
V
OUT
90%
10%
Active-Low Switch Delay Times (MIC2073-2/2074-2)
Active-High Switch Delay Time (MIC2073-1/2074-1)
January 2009
5
M9999-011209
嵌入式系统
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