MICREL MIC2073-1YM

MIC2073/2074
Dual-Channel Power Distribution Switch
General Description
Features
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.
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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 (TD) 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
VCC
2.7V to 5.5V
VCONT.
10k
10k
Logic Controller
VIN
ON/OFF
OVERCURRENT
OVERCURRENT
ON/OFF
MIC2073/74
ENA
FLGA
FLGB
OUTA
IN
GND
ENB
OUTB
Load
0.1µF
Load
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
Enable
MIC2073-1YM
Active High
MIC2073-2YM
Active Low
MIC2074-1YM
Active High
MIC2074-2YM
Active Low
NOTE:
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
8 OUTA
FLGA 2
7 IN
FLGB 3
6 GND
ENB 4
5 OUTB
8-Pin SOIC (M)
MIC2073/2074
Pin Description
Pin Number
Pin Name
1
ENA
Switch A Enable (Input): Logic-compatible, enable input. Active high (-1) or
active low (-2).
FLGA
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.
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.
4
ENB
Switch B Enable (Input): Logic-compatible enable input. Active-high (-1) or
active-low (-2).
5
OUTB
Switch B (Output)
6
GND
Ground
7
IN
8
OUTA
2
January 2009
Pin Function
B
B
B
B
Input: Switch and logic supply input.
Switch A (Output)
2
M9999-011209
Micrel, Inc.
MIC2073/2074
Absolute Maximum Ratings (1)
Operating Ratings (2)
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
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
P
B
B
B
B
B
B
B
P
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
Electrical Characteristics(4)
P
VIN = 5 V; TA = 25°C, bold values indicate –40°C ≤ TA ≤ +85°C; unless noted
Symbol
Parameter
Condition
Min
Typ
Max
Units
MIC2073-1, V ENA = V ENB ≤ 0.8 V
(switch off), OUT = open
0.40
5
µA
MIC2073-2, V ENA = V ENB ≥ 2.4 V
(switch off), OUT = open
7.5
20
µA
MIC2073-1, V ENA = V ENB ≥ 2.4 V
(switch on), OUT = open
100
160
µA
MIC2073-2, V ENA = V ENB ≤ 0.8 V
(switch on), OUT = open
100
160
µA
low-to-high transition
1.6
2.4
V
B
B
B
I DD
B
Supply Current
B
B
B
V EN
B
B
B
B
B
B
B
B
B
B
B
B
Enable Input Threshold
B
high-to-low transition
V EN_HYST
B
B
Enable Input Hysteresis
I EN
Enable Input Current
CEN
Enable Input Capacitance
B
B
R DS(ON)
B
I LIMIT
B
B
0.8
V EN = 0 V to 5.5 V
B
-1
B
1.40
V
225
mV
0.01
1
1
µA
pF
MIC2073/2074 ,
V IN = 5.0 V, I OUT = 500 mA
115
170
mΩ
MIC2073/2074
V IN = 3.3 V, I OUT = 500 mA
145
210
mΩ
10
µA
B
B
B
B
Switch Resistance
B
B
B
B
Output Leakage Current
MIC2073-1/2074-1, VENx ≤ 0.8 V;
MIC2073-2/2074-2, VENx ≥ 2.4 V, (output off)
Off Current (Thermal Shutdown)
MIC2074, Thermal shutdown state
Short-Circuit Output Current
V OUT = 0V, enabled into short-circuit
Current-Limit Threshold
Ramped load applied to output
Undervoltage Lockout
Threshold
V IN rising
V IN falling
50
0.7
1.25
A
1.0
1.25
A
2.2
2.45
2.7
V
2.0
2.25
2.5
V
I L = 10 mA, V IN = 5.0 V
12
25
I L = 10 mA, V IN = 3.3 V
14
40
B
B
0.5
µA
B
VUVLO
B
B
Error Flag Output Resistance
B
B
Error Flag Off Current
January 2009
B
B
B
B
B
B
B
B
V FLAG = V IN
B
B
B
10
B
3
Ω
µA
M9999-011209
Micrel, Inc.
MIC2073/2074
VIN = 5 V; TA = 25°C, bold values indicate –40°C ≤ TA ≤ +85°C; unless noted (Continued)
Symbol
Parameter
Condition
tSC_RESP
Short-Circuit Response Time
V OUT = 0 V, to IOUT = ILIMIT
(short applied to output)
20
t ON
Output Turn-On Delay
R L = 10 Ω, C L = 1 µF, see “Timing
Diagrams”
1.3
5
ms
tR
Output Turn-On Rise Time
R L = 10 Ω, C L = 1 µF, see “Timing
Diagrams”
1.15
4.9
ms
t OFF
Output Turn-Off Delay
R L = 10 Ω, C L = 1 µF, see “Timing
Diagrams”
35
100
µs
tF
Output Turn-Off Fall Time
R L = 10 Ω, C L = 1 µF, see “Timing
Diagrams”
32
100
µs
tD
Overcurrent Flag Response
Delay
4
7
ms
B
B
B
B
B
B
B
B
TOVERTEMP
Overtemperature Threshold
B
Min
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
VIN = 5 V apply VOUT 0 V until FLG LOW
VIN = 3.3 V apply VOUT 0 V until FLG LOW
(5)
0.5
1.5
Typ
Max
Units
µs
3
ms
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
B
B
B
B
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.
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MIC2073/2074
Test Circuit
VOUT
Device
Under OUT
Test
RL
CL
Timing Diagrams
tR
tF
90%
90%
VOUT
10%
10%
Output Rise and Fall Times
VEN
50%
tOFF
tON
VOUT
90%
10%
Active-Low Switch Delay Times (MIC2073-2/2074-2)
Active-High Switch Delay Time (MIC2073-1/2074-1)
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MIC2073/2074
Typical Characteristics
180
180
5V
120
100
80
3.3V
60
40
120
5V
100
80
60
40
3
2
VIN = 3.3V
1
VIN = 5V
Supply On-Current
vs. Input Voltage
On-Resistance
vs. Input Voltage
Turn-On Rise Time
vs. Input Voltage
100
50
+85°C
1000
+25°C
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
Short-Circuit Current-Limit
vs. Temperature
VIN = 3.3V
800
VIN = 5V
600
400
200
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
1000
900
Short-Circuit Current-Limit
vs. Input Voltage
800
700 +85°C
+25°C
-40°C
600
500
400
300
200
100
0
2.5
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
January 2009
5.5
+25°C
100
-40°C
50
0
2.5
5.5
RISE TIME (ms)
-40°C
2.0
+85°C
150
1200
1000
800
1.5
+85°C
+25°C
-40°C
1.0
0.5
IOUT = 500mA
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
0
2.5
5.5
Current-Limit Threshold
vs. Temperature
100
90
VIN = 5V
VIN = 3.3V
600
400
200
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
Fall Time
vs. Temperature
80
70
60
50
40
30
20
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
10
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Current-Limit Threshold
vs. Input Voltage
Fall Time
vs. Input Voltage
1200
100
90
+85°C
1000
800
+25°C
RISE TIME (µs)
150
2.5
FALL TIME (µs)
RESISTANCE (mOhm)
200
CURRENT LIMIT THRESHOLD (mA)
CURRENT (µA)
4
140
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
0
2.5
CURRENT LIMIT (mA)
5
3.3V
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
200
CURRENT LIMIT (mA)
160
Turn-On Rise Time
vs. Temperature
20 I = 500mA
OUT
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
20
CURRENT LIMIT THRESHOLD (mA)
CURRENT (µA)
140
ON-RESISTANCE (mOhms)
160
On-Resistance
vs. Temperature
RISE TIME (ms)
Supply On-Current
vs. Temperature
-40°C
600
400
200
0
2.5
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
6
5.5
80
70
60
50
40
30
20
10
0
2.5
25°C
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
M9999-011209
Micrel, Inc.
MIC2073/2074
Typical Characteristics (continue)
VEN RISING
1.5
VEN FALLING
1.0
0.5
4
MIC2073-1 Supply Off Current
vs. Temperature
VIN = 3.3V
VIN = 5V
3
2
1
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
Enable Threshold
vs. Input Voltage
Flag Delay
vs. Input Voltage
5
MIC2073-1 Supply Off Current
vs. Input Voltage
0.60
DELAY TIME (ms)
VEN RISING
1.5
VEN FALLING
1.0
0.5
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
UVLO THRESHOLD (V)
3.0
2.5
2.0
5.5
UVLO Threshold
vs. Temperature
3.3V
5V
1.5
1.0
0.5
0
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
January 2009
4
3
+25°C
-40°C
2
1
0
2.5
3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
5.5
0.55
0.50
8.0
7.0
3.3V
5V
6.0
5.0
4
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
7
+25°C
0.40
0.35
0.30
-40°C
0.25
0.20
2.5
3.0
3.5 4.0 4.5
VOLTAGE (V)
5.0
5.5
MIC2073-2 Supply Off-Current
vs. Input Voltage
10.0
9.0
+85°C
0.45
MIC2073-2 Supply Off-Current
vs. Temperature
SUPPLY OFF-CURRENT (µA)
0
2.5
SUPPLY CURRENT (µA)
+85°C
2.0
0.80
0.75
0.70
0.65
0.60
0.55
0.50
5V
0.45
0.40
0.35
0.30
3.3V
0.25
0.20
-40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
10
SUPPLY OFF-CURRENT (µA)
2.0
2.5
ENABLE THRESHOLD (V)
5
DELAY TIME (ms)
ENABLE THRESHOLD (V)
2.5
Flag Delay
vs. Temperature
SUPPLY CURRENT (µA)
Enable Threshold
vs. Temperature
9
8
85°C
7
6
-40°C
25°C
5
4
2.5
3
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
M9999-011209
Micrel, Inc.
MIC2073/2074
Functional Characteristics
January 2009
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MIC2073/2074
Functional Characteristics (continued)
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MIC2073/2074
Functional Characteristics (continue)
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MIC2073/2074
Block Diagram
MIC2073/2074 Block Diagram
Functional Description
Thermal Shutdown
Thermal shutdown is employed to protect the device
from damage should the die temperature exceed safe
margins due mainly to short circuit faults. Each channel
employs its own thermal sensor. Thermal shutdown
shuts off the output MOSFET and asserts the FLG
output if the die temperature reaches 140°C and the
overheated channel is in current limit. The other channel
is not affected. If however, the die temperature exceeds
160°C, then both channels will be shut off. Upon
determining a thermal shutdown condition, the MIC2074
will latch the output off. In this case, a pull-up current
source is activated. This allows the output latch to
automatically reset when the load (such as a USB
device) is removed. The output can also be reset by
toggling EN. Refer to Figure 1 for timing details.
The MIC2073 will automatically reset its output when the
die temperature cools down to 120°C. The MIC2073
output and FLG signal will continue to cycle on and off
until the device is disabled or the fault is removed.
Figure 2 depicts typical timing.
Depending upon PCB layout package, ambient
temperature, etc., it may take several hundred
milliseconds from the incidence of the fault to the output
MOSFET being shut off. This time will be shortest in the
case of a dead short on the output.
Input and Output
IN is the power supply connection to the logic circuitry
and the drain of the output MOSFET. OUT is the source
of the output MOSFET. In a typical circuit, current flows
from IN to OUT toward the load when the switch is
enabled.
An important consideration in a choosing switch is
whether it has “reverse voltage protection” that is, does
not have a body diode. Reverse voltage protection is
important when the switch is disabled and a voltage is
presented to the OUT pin that is greater than the VIN
voltage. The reverse voltage protection prevents current
flow in the reverse path from OUT to IN.
On other hand when the switch is enabled the switch is
bidirectional. In this case when a voltage is presented to
the OUT pin that is greater than the VIN voltage, current
will flow from OUT to IN.
The output MOSFET and driver circuitry are also
designed to allow the MOSFET source to be externally
forced to a higher voltage than the drain (VOUT > VIN)
when the switch is disabled. In this situation, the
MIC2073/2074 prevents undesirable current flow from
OUT to IN.
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MIC2073/2074
•
Power Dissipation
The device’s junction temperature depends upon several
factors such as the load, PCB layout, ambient
temperature, and package type. Equations that can be
used to calculate power dissipation of each channel and
junction temperature are found below:
• Current-Limit Response - Ramped Load
The MIC2073/2074 current-limit profile exhibits a
small foldback effect of about 200mA. Once this
current-limit threshold is exceeded the device
switches into a constant current mode. It is important
to note that the device will supply current up to the
current-limit threshold.
PD = RDS(on) × IOUT2
Total power dissipation of the device will be the
summation of PD for both channels. To relate this to
junction temperature, the following equation can be
used:
TJ = PD × θJA + TA
where:
Fault Flag
The FLG signal is an N-channel open-drain MOSFET
output. FLG is asserted (active-low) when either an
overcurrent or thermal shutdown condition occurs. In the
case of an overcurrent condition, FLG will be asserted
only after the flag response delay time, tD, has elapsed.
This ensures that FLG is asserted only upon valid
overcurrent conditions and that erroneous error reporting
is eliminated. For example, false overcurrent conditions
can occur during hot plug events when a highly
capacitive load is connected and causes a high transient
inrush current that exceeds the current-limit threshold for
up to 1ms. The FLG response delay time tD is typically
3ms.
TJ = junction temperature
TA = ambient temperature
θJA = is the thermal resistance of the package
Current Sensing and Limiting
The current-limit threshold is preset internally. The
preset level prevents damage to the device and external
load but still allows a minimum current of 500mA to be
delivered to the load.
The current-limit circuit senses a portion of the output
MOSFET switch current. The current-sense resistor
shown in the block diagram is a virtual resistor and has
no voltage drop. The reaction to an overcurrent condition
varies with three scenarios:
•
Undervoltage Lockout
Undervoltage lockout (UVLO) prevents the output
MOSFET from turning on until VIN exceeds
approximately 2.5V. Undervoltage detection functions
only when the switch is enabled.
Switch Enabled into Short-Circuit
If a switch is enabled into a heavy load or shortcircuit, the switch immediately enters into a constantcurrent mode, reducing the output voltage. The FLG
signal is asserted indicating an overcurrent
condition.
Short-Circuit Fault
VEN
Short-Circuit Applied to Enabled Output
When a heavy load or short-circuit is applied to an
enabled switch, a large transient current may flow
until the current-limit circuitry responds. Once this
occurs, the device limits current to less than the
short-circuit current limit specification.
Load and Fault Removed
(Output Reset)
VOUT
ILIMIT
ILOAD
IOUT
VFLG
Thermal
Shutdown
Reached
3ms typ.
delay
Figure 1. MIC2074-2 Fault Timing: Output Reset by Removing Load
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MIC2073/2074
Short-Circuit Fault
VEN
Load and Fault Removed
(Output Reset)
VOUT
ILIMIT
ILOAD
IOUT
VFLG
Thermal
Shutdown
Reached
3ms typ.
delay
Figure 2. MIC2073-2 Fault Timing
Application Information
Universal Serial Bus (USB) Power Distribution
The MIC2073/2074 are ideally suited for USB (Universal
Serial Bus) power distribution applications. The USB
specification defines power distribution for USB host
systems such as PCs and USB hubs. Hubs can either
be self-powered or bus-powered (that is, powered from
the bus). Figure 5 shows a typical USB Host application
that may be suited for mobile PC applications employing
USB. The requirement for USB host systems is that the
port must supply a minimum of 500mA at an output
voltage of 5V ±5%. In addition, the output power
delivered must be limited to below 25VA. Upon an
overcurrent condition, the host must also be notified. To
support hot-plug events, the hub must have a minimum
of 120µF of bulk capacitance, preferably low ESR
electrolytic or tantalum. Please refer to Application Note
17 for more details on designing compliant USB hub and
host systems.
For bus-powered hubs, USB requires that each
downstream port be switched on or off under control by
the host. Up to four downstream ports each capable of
supplying 100mA at 4.4V minimum are allowed. In
addition, to reduce voltage droop on the upstream VBUS,
soft-start is necessary. Although the hub can consume
up to 500mA from the upstream bus, the hub must
consume only 100mA max at start-up, until it
enumerates with the host prior to requesting more
power. The same requirements apply for bus-powered
peripherals that have no downstream ports. Figure 6
shows a bus-powered hub.
Supply Filtering
A 0.1µF to 1µF bypass capacitor positioned close to VIN
and GND of the device is strongly recommended to
control supply transients. Without a bypass capacitor, an
output short may cause sufficient ringing on the input
(from supply lead inductance) to damage internal control
circuitry.
Printed Circuit Board Hot-Plug
The MIC2073/2074 are ideal inrush current-limiters for
hot plug applications. Due to their integrated charge
pumps, the MIC2073/2074 present a high impedance
when off and slowly becomes a low impedance as their
integrated charge pumps turn on. This “soft-start” feature
effectively isolates power supplies from highly capacitive
loads by reducing inrush current. Figure 3 shows how
the MIC2074 may be used in a card hot-plug application.
In cases of extremely large capacitive loads (>400µF),
the length of the transient due to inrush current may
exceed the delay provided by the integrated filter. Since
this inrush current exceeds the current-limit delay
specification, FLG will be asserted during this time. To
prevent the logic controller from responding to FLG
being asserted, an external RC filter, as shown in Figure
4, can be used to filter out transient FLG assertion. The
value of the RC time constant should be selected to
match the length of the transient, less tD(min) of the
MIC2073/2074.
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MIC2073/2074
USB
Controller
MIC2073/2074
VBUS
4.7
µF
to "Hot"
Receptacle
1
ENA
OUTA
8
2
FLGA
IN
7
3
FLGB
GND
6
4
ENB
OUTB
5
USB
Function
CBULK
USB
Function
CBULK
GND
Cable
USB Peripheral
Figure 3. Hot-Plug Application
Figure 4. Transient Filter
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MIC2073/2074
1
8
2
7
3
6
4
5
Figure 5. USB Two-Port Host Application
1
8
2
7
3
6
4
5
Figure 6. USB Two-Port Bus-Powered Hub
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MIC2073/2074
Package Information
8-Pin SOIC (M)
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MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s
use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2009 Micrel, Incorporated
January 2009
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M9999-011209