MIC2204YMMTR [MICROCHIP]
2A SWITCHING REGULATOR, 2200kHz SWITCHING FREQ-MAX, PDSO10, LEAD FREE, MSOP-10;
| 型号： | MIC2204YMMTR |
| 厂家： | 
MICROCHIP |
| 描述： | 2A SWITCHING REGULATOR, 2200kHz SWITCHING FREQ-MAX, PDSO10, LEAD FREE, MSOP-10 开关 光电二极管 |
| 文件： | 总11页 (文件大小：150K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC2204
Micrel, Inc.
MIC2204
High-Efficiency 2MHz Synchronous Buck Converter
General Description
Features
The Micrel MIC2204 is a high-efficiency, 2MHz PWM syn-
chronous buck switching regulator. Power conversion effi-
ciency of above 95% is easily obtainable over a wide range
of applications. A proprietary internal compensation tech-
nique ensures stability with the smallest possible inductor
and ceramic output capacitor.
• Input voltage range: 2.3V to 5.5V
• Output down to 1V/ 600mA
• 2MHz PWM operation
• Ultra-fast transient response (typical 200kHz GBW)
• Internal compensation
• All ceramic capacitors
• >95% efficiency
The MIC2204 operates from 2.3V to 5.5V input and features
internal power MOSFETs that can supply over 600mA of
outputcurrentwithoutputvoltagesdownto1V. TheMIC2204
implementsaconstant2MHzpulse-width-modulation(PWM)
controlschemewhichreducesspuriousnoiseinsensitiveRF
and communication applications. Additionally, the MIC2204
canbesynchronizedtoanexternalclock,ormultipleMIC2204s
can easily be daisy-chained with the SYNCLOCK feature.
TheMIC2204hasahighbandwidthloop(typ. 200kHz) which
allows ultra-fast transient response times. This is very useful
when powering applications that require fast dynamic re-
sponses, such as the CPU cores and RF circuitry in high-
performance cellular phones and PDAs.
• Fully integrated MOSFET switches
• Easily synchronized to external clock
• SYNCLOCK feature to daisy-chain multiple 2204s
• <340µA quiescent current
• Logic controlled micropower shutdown
• Thermal shutdown and current limit protection
• 10-pin MSOP and 3mm×3mm MLF™-10L
• –40°C to +125°C junction temperature range
Applications
• High-efficiency portable power
• Cellular phones
The MIC2204 is available in 10-pin MSOP and 3mm × 3mm
MLF™-10L package options with an operating junction tem-
perature range from –40°C to 125°C .
• PDAs
• 802.11 WLAN power supplies
• RF power supplies
• Li Ion battery powered applications
Typical Application
Efficiency
4.7µH
vs. Output Current
3.3V
100
95
90
85
80
75
70
65
60
55
50
500mA
MIC2204BMM
1
2
3
4
5
10
9
4.2VIN
5VIN
3.6VIN
2.3V to 6V
SYNC_IN
SYNC_OUT
EN
4.7µF
8
7
6
10nF
3.3VOUT
0
100 200 300 400 500
OUTPUT CURRENT (mA)
Adjustable Output Synchronous Buck Converter
MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
M9999-042205
April 2005
1
MIC2204
Micrel, Inc.
Ordering Information
Part Number
MIC2204BMM
MIC2204YMM
MIC2204BML
MIC2204YML
Voltage
Junction Temp. Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
Lead Finish
Standard
Lead-Free
Standard
Lead-Free
Adjustable
Adjustable
Adjustable
Adjustable
10-pin MSOP
10-pin MSOP
10-pin MLF™
10-pin MLF™
Pin Configuration
SW
VIN
1
2
3
4
5
10 GND
SW
VIN
1
2
3
4
5
10 GND
9
8
7
6
GND
GND
BIAS
FB
GND
GND
BIAS
9
8
7
6
SYNC_IN
SYNC_OUT
EN
SYNC_IN
SYNC_OUT
EN
FB
MSOP-10 (MM)
MLF-10 (ML)
Pin Description
Pin Number
Pin Name
Pin Function
1
2
3
SW
VIN
SYNC_IN
Switch (Output): Internal power MOSFET output switches.
Supply Voltage (Input): Requires bypass capacitor to GND.
SYNC_IN for the MIC2204: Sync the main switching frequency to an
external clock. Tie pin to ground if not using this function. Tying SYNC_IN
high reduces the switching frequency to 1.6MHz (See “Applications Informa-
tion” section).
4
SYNC_OUT
EN
SYNC_OUT an open collector output to feed into SYNC_IN. Float or ground
the SYNC_OUT pin if not using sync out function.
5
A low level EN will power down the device, reducing the quiescent current to
under 15µA (typ. 6.5µA).
6
7
FB
Input to the error amplifier, connect to the external resistor divider network to
set the output voltage.
BIAS
Internal circuit bias supply, nominally 2.3V. Must be de-coupled to signal
ground with a 0.01µF capacitor.
8, 9, 10
GND
Ground.
M9999-042205
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April 2005
MIC2204
Micrel, Inc.
Absolute Maximum Ratings(1)
Operating Ratings(3)
Supply Voltage (V ) .......................................................6V
Supply Voltage (V ) ................................... +2.3V to +5.5V
IN
IN
Output Switch Voltage (V ) ..........................................6V
Junction Temperature (T ) ................ –40°C ≤ T ≤ +125°C
SW
J
J
Logic Input Voltage (V , V
)............... V to –0.3V
Package Thermal Resistance
EN
SYNC_IN
IN
(2)
Power Dissipation
MSOP (θ ) .......................................................115°C/W
JA
3mm×3mm MLF™-10L (θ )...............................60°C/W
Storage Temperature (T ) ....................... –65°C to +150°C
JA
S
Electrical Characteristics(4)
TA = 25°C with VIN =VEN = 3.5V, unless otherwise noted. Bold values indicate –40°C < TJ < +125°C
Parameter
Supply Voltage Range
Current Limit
Condition
Min
2.3
0.6
Typ
Max
5.5
2
450
15
Units
V
A
µA
µA
V
%
%
%
VFB = 0.7V
VFB = 1.1V
EN = 0V
1.2
320
6.0
1.0
0.2
0.2
Quiescent Current
Feedback Voltage
0.98
1.02
Output Voltage Line Regulation
Output Voltage Load Regulation
Maximum Duty Cycle
VOUT = 1V, VIN = 2.3V to 5.5V, ILOAD= 100mA
0mA < ILOAD < 500mA
VFB = 0.7V
100
Switch On-Resistance
ISW = 300mA, VFB = 0.7V
ISW = –300mA, VFB = 1.1V
0.72
0.55
2
Ω
Ω
Oscillator Frequency
Sync Frequency Range
SYNC_IN Threshold
Sync Minimum Pulse Width
SYNC_IN Input Current
Enable Threshold
Enable Hysteresis
Enable Input Current
Overtemperature Shutdown
1.8
1.8
2.2
2.5
MHz
MHz
V
ns
µA
V
mV
µA
°C
°C
1.2
10
1
0.72
20
1
2
0.96
0.52
2
160
20
Overtemperature Shutdown
Hysteresis
Notes:
1.
2.
3.
4.
Exceeding the ABSOLUTE MAXIMUM RATINGS may damage device.
Absolute maximum power dissipation is limited by maximum junction temperature where P
The device is not guaranteed to function outside its operating rating.
Specification for packaged product only.
= (T
–T ) ÷ θ .
J(MAX) A JA
D(MAX)
April 2005
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M9999-042205
MIC2204
Micrel, Inc.
Typical Characteristics
Efficiency
Efficiency
Efficiency
vs. Output Current
vs. Output Current
vs. Output Current
100
95
90
85
80
75
70
65
60
55
50
100
100
95
90
85
80
75
70
65
60
55
50
4.2VIN
95
4VIN
90
4.2VIN
85
3.6VIN
3.3VIN
3.6VIN
80
3.5VIN
5VIN
75
3VIN
70
65
60
1.8VOUT
3.3VOUT
55
2.5VOUT
50
0
100 200 300 400 500
OUTPUT CURRENT (mA)
0
100 200 300 400 500
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
V
Output Voltage
BIAS
Output Voltage
vs. Temperature
vs. Output Current
vs. Supply Voltage
2.5
2.0
1.5
1.0
0.5
0
1.01
1.01
1.005
1
1.0075
1.005
1.0025
1
0.9975
0.995
0.9925
0.99
0.995
0.99
VFB = 0V
0
2
4
6
0
0.1
0.2
0.3
0.4
0.5
-40 -20
0
20 40 60 80 100 120
SUPPLY VOLTAGE (V)
OUTPUT CURRENT (A)
TEMPERATURE (°C)
Quiescent Current
vs. Temperature
Bias Supply
Quiescent Current
vs. Supply Voltage
vs. Temperature
2.32
2.318
2.316
2.314
2.312
2.31
350
300
250
200
150
100
50
318
316
314
312
310
308
306
304
302
300
298
2.308
2.306
2.304
2.302
VFB = 0V
VIN = 3.6V
0
-40 -20
0
20 40 60 80 100 120
0
1
2
3
4
5
6
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
Frequency
Enable Threshold
vs. Temperature
Enable Threshold
vs. Supply Voltage
vs. Temperature
2.40
2.30
2.20
2.10
2.00
1.90
1.80
1.70
1.60
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
Enable On
Enable Off
VIN = 3.6V
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
-40 -20 0
2.3 2.8 3.3 3.8 4.3 4.8 5.3
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
M9999-042205
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April 2005
MIC2204
Micrel, Inc.
Functional Characteristics
Enable Transient
Disable Transient
VIN = 3.6V
VOUT = 1V
L = 4.7µH
C = 10µF
VIN = 3.6V
VOUT = 1V
L = 4.7µH
C = 10µF
IOUT = 500mA
TIME (40µs/div.)
TIME (40µs/div.)
Line Transient
Load Transient
VIN = 3.6V
VOUT = 2V
L = 4.7µH
C = 4.7µF
VOUT = 1V
L = 4.7µH
C = 10µF
IOUT = 500mA
TIME (200µs/div.)
TIME (20µs/div.)
Switch Node Output Ripple
VIN = 3.6V
IOUT = 500mA
VOUT = 1V L = 4.7µH
C = 10µF X5R
TIME (400ns/div.)
April 2005
5
M9999-042205
MIC2204
Micrel, Inc.
Block Diagram
VIN
CIN
SYNC_OUT
VIN
Oscillator
Ramp
SYNC_IN
Generator
BIAS
Internal
Supply
PWM
Comparator
Error
SW
Amplifier
VOUT
Driver
COUT
1.0V
EN
MIC2204
PGND
FB
MIC2204 Block Diagram
M9999-042205
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April 2005
MIC2204
Micrel, Inc.
SYNC_OUT
Functional Description
Since SYNC_OUT is an open collector output that provides
a signal equal to the internal oscillator frequency, multiple
MIC2204s to be connected together in a master-slave con-
figuration for frequency matching of the converters. A typical
10kΩ is recommended for a pull-up resistor.
VIN
VIN provides power to the output and to the internal bias
supply. The supply voltage range is from 2.3V to 5.5V. A
minimum 1µF ceramic is recommended for bypassing the
input supply.
BIAS
Enable
The bias supply is an internal 2.3V linear regulator that
supplies the internal biasing voltage to the MIC2204. A 10nF
ceramiccapacitorisrequiredonthispinforbypassing. Donot
use the BIAS pin as a supply. The BIAS pin was designed to
supply internal power and not external circuitry.
The enable pin provides a logic level control of the output. In
the off state, supply current of the device is greatly reduced
(typically 6.5µA). Also, in the off state, the output drive is
placed in a “tri-stated” condition, where both the high-side
P-ChannelMOSFETandthelow-sideN-Channelareinanoff
or non-conducting state. Do not drive the enable pin above
the supply voltage.
Feedback
The feedback pin provides the control path to control the
output. A resistor divider connecting the feedback to the
output is used to adjust the desired output voltage. Refer to
the “Feedback” material in the “Applications Information”
section for more detail.
SYNC_IN
SYNC_IN enables the ability to change the fundamental
switching frequency. The SYNC_IN frequency has a mini-
mum frequency of 1.8MHz and a maximum sync frequency
of 2.5MHz.
Careful attention should be paid to not driving the SYNC_IN
pingreaterthanthesupplyvoltage.Whilethiswillnotdamage
the device, it will cause improper operation.
MIC2204
“Master”
VIN
SW
BIAS
10kΩ
SYNC_IN
SYNC_OUT
FB
MIC2204
“Slave”
VIN
SW
BIAS
SYNC_IN
SYNC_OUT
FB
Figure 1. SYNC_OUT
April 2005
7
M9999-042205
MIC2204
Micrel, Inc.
The size requirements refer to the area and height require-
ments that are necessary to fit a particular design. Please
refer to the inductor dimensions on their data sheet.
Applications Information
Input Capacitor
A minimum 1µF ceramic is recommended on the VIN pin for
bypassing. X5R or X7R dielectrics are recommended for the
input capacitor. Y5V dielectrics are not recommended: they
lose most of their capacitance over temperature and also
become resistive at high frequencies. This reduces their
ability to filter out high frequency noise.
DC resistance is also important. While DCR is inversely
proportional to size, DCR can represent a significant effi-
ciency loss. Refer to the “Efficiency Considerations ” below
for a more detailed description.
Table 1 below shows a list of recommended 4.7µH inductors
by manufacturer, part number and key specifications.
Output Capacitor
Bias Capacitor
TheMIC2204wasdesignedspecificallyfortheuseofa4.7µF
ceramic output capacitor. The output capacitor requires
either an X7R or X5R dielectric. Y5V and Z5U dielectric
capacitors, aside from the undesirable effect of their wide
variation in capacitance over temperature, become resistive
at high frequencies. Using Y5V or Z5U capacitors will cause
instabilityintheMIC2204. Foroutputvoltageslessthan1.6V,
a 10µF capacitor may be required for stability. See the
“Compensation” section for more detail.
A small 10nF ceramic capacitor is required to bypass the
BIAS pin. The use of low ESR ceramics provides improved
filtering for the bias supply.
Efficiency Considerations
Efficiency is defined as the amount of useful output power,
divided by the amount of power consumed.
OUT
VOUT ×I
Efficiency % =
×100
Total output capacitance should not exceed 15µF. Large
values of capacitance can cause current limit to engage
duringstart-up. Iflargerthan15µFisrequired, afeed-forward
capacitor from the output to the feedback node should be
used to slow the start-up time.
V
IN ×IIN
Maintaining high-efficiency serves two purposes. It reduces
power dissipation in the power supply, reducing the need for
heat sinks and thermal design considerations and it reduces
consumption of current for battery powered applications.
Reduced current draw from a battery increases the devices
operating time, critical in handheld devices.
Inductor Selection
Inductor selection will be determined by the following (not
necessarily in the order of importance):
There are two loss terms in switching converters: DC losses
• Inductance
and switching losses. DC losses are simply the power dissi-
2
• Rated current value
pation of I R. For example, power is dissipated in the high-
• Size requirements
side switch during the on cycle, where power loss is equal to
• DC resistance (DCR)
the high-side MOSFET R
multiplied by the Switch
DSON
2
The MIC2204 is designed for use with a 4.7µH inductor.
Current . During the off cycle, the low-side N-Channel
MOSFETconducts,alsodissipatingpower.Deviceoperating
current also reduces efficiency. The product of the quiescent
(operating)currentandthesupplyvoltageisanotherDCloss.
Thecurrentrequiredtodrivethegatesonandoffataconstant
2MHz frequency and the switching transitions make up the
switching losses.
Maximum current ratings of the inductor are generally given
in two methods: permissible DC current and saturation cur-
rent. Permissible DC current can be rated either for a 40°C
temperature rise or a 10% loss in inductance. Ensure the
inductor selected can handle the maximum operating cur-
rent. When saturation current is specified, make sure that
there is enough margin that the peak current will not saturate
the inductor.
Manufacturer
Sumida
Murata
P/N
H(mm)
2
2.6
2.2
2.74
W(mm)
3.2
3.2
2.7
3.8
L(mm)
3.2
4.6
3.4
3.8
DCR(mΩ)
81
CDRH2D18-4R7
LQH43CN4R7M01
LQH32CN4R7M11
1008PS-472M
150
195
350
Murata
Coilcraft
Low Profile
TDK
LDR5610T-4R7MR90
CMD4D06
1
0.8
5.2
6.3
5.8
5.8
240
216
Sumida
Table 1. Component Selection Table
M9999-042205
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April 2005
MIC2204
Micrel, Inc.
Figure 2 shows an efficiency curve. On the non-shaded
portion, from 0 to 200mA, efficiency losses are dominated by
quiescent current losses, gate drive and transition losses. In
thiscase,lowersupplyvoltagesyieldgreaterefficiencyinthat
they require less current to drive the MOSFETs and have
reduced input power consumption.
ingoutputvoltageregulation. Withatypicalgainbandwidthof
200kHz, the MIC2204 is capable of extremely fast transient
responses.
The MIC2204 is designed to be stable with a 4.7µH inductor
and a 4.7µF ceramic (X5R) output capacitor for output
voltages greater than 1.6V. For output voltages less than
1.6V, a 10µF capacitor is required. Also, when a feed forward
capacitor is used, the gain bandwidth is increased to unity
gain. This will also require increasing the output capacitor to
10µF.
Efficiency
vs. Output Current
100
95
90
85
80
75
70
65
60
55
50
4.2VIN
5VIN
3.6VIN
Feedback
The MIC2204 provides a feedback pin to adjust the output
voltage to the desired level. This pin connects internally to an
error amplifier. The error amplifier then compares the voltage
at the feedback to the internal 1V reference voltage and
adjuststheoutputvoltagetomaintainregulation.Tocalculate
the resistor divider network for the desired output is as
follows:
3.3VOUT
0
100 200 300 400 500
OUTPUT CURRENT (A)
Figure 2.
On the shaded region, 200mA to 500mA, efficiency loss is
R1
OUT
V
REF
R2 =
dominated by MOSFET R and inductor losses. Higher
DSON
V
inputsupplyvoltageswillincreasetheGate-to-Sourcethresh-
1
old on the internal MOSFETs, reducing the internal R
.
DSON
ThisimprovesefficiencybyreducingDClossesinthedevice.
All but the inductor losses are inherent to the device, making
inductor selection even more critical in efficiency calcula-
tions. As the inductors are reduced in size, the DC resistance
(DCR) can become quite significant. The DCR losses can be
calculated as follows:
Where V
is 1.0V and V
is the desired output voltage.
REF
OUT
A10kΩ orlowerresistorvaluefromtheoutputtothefeedback
isrecommended. Largerresistorvaluesrequireanadditional
capacitor(feed-forward)fromtheoutputtothefeedback. The
large high-side resistor value and the parasitic capacitance
on the feedback pin (~10pF) can cause an additional pole in
the loop. The additional pole can create a phase loss at
high-frequency.Thisphaselossdegradestransientresponse
by reducing phase margin. Adding feed-forward capacitance
negates the parasitic capacitive effects of the feedback pin.
A minimum 1000pF capacitor is recommended for feed-
forward capacitance.
2
L
=I
x DCR
PD OUT
Fromthat,thelossinefficiencyduetoinductorresistancecan
be calculated as follows:
V
OUT
×I
OUT
OUT
OUT
Efficiency Loss = 1
×100
V
×I
+ L
PD
Also, largefeedbackresistorvaluesincreasetheimpedance,
makingthefeedbacknodemoresusceptibletonoisepick-up.
A feed-forward capacitor would also reduce noise pick-up by
providing a low impedance path to the output.
When using a feed-forward capacitor, the gain bandwidth of
the device reaches unity gain at high-frequency. Therefore,
output capacitance will need to be increased to a minimum
10µF. For more information on output capacitor selection for
stability, see the “Compensation ” section.
Efficiency loss due to DCR is minimal at light loads and gains
significance as the load is increased. Inductor selection
becomes a trade-off between efficiency and size in this case.
Compensation
The MIC2204 is an internally compensated, voltage-mode
buck regulator. Voltage mode is achieved by creating an
internal 2MHz ramp signal and using the output of the error
amplifier to pulsewidth modulate the switch node, maintain-
April 2005
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M9999-042205
MIC2204
Micrel, Inc.
PWM Operation
Synchronization
The MIC2204 is a pulsewidth modulation (PWM) controller.
By controlling the ratio of on-to-off time, or duty cycle, a
regulated DC output voltage is achieved. As load or supply
voltage changes, so does the duty cycle to maintain a
constantoutputvoltage. Incaseswheretheinputsupplyruns
into a dropout condition, the MIC2204 will run at 100% duty
cycle.
SYNC_IN allows the user to change the frequency from
2MHz up to 2.5MHz or down to 1.8MHz. This controls the
fundamentalfrequencyandalltheresultantharmonics.Main-
taining a predictable frequency creates the ability to either
shift the harmonics away from sensitive carrier and IF fre-
quency bands, or to accurately filter out specific harmonic
frequencies.
The MIC2204 provides constant switching at 2MHz with
synchronous internal MOSFETs. The internal MOSFETs
include a high-side P-Channel MOSFET from the input
supply to the switch pin and an N-Channel MOSFET from the
switchpintoground. Sincethelow-sideN-ChannelMOSFET
provides the current during the off cycle, a free wheeling
Schottkydiodefromtheswitchnodetogroundisnotrequired.
Connecting the SYNC_OUT function pin to the SYNC_IN of
other MIC2204s will synchronize multiple MIC2204s in a
daisy-chain. Synchronizing multiple MIC2204s means that
regulatorswillrunatthesamefundamentalfrequency,result-
ing in matched harmonic frequencies and simplifying design
for sensitive communication equipment.
PWM control provides fixed frequency operation. By main-
taining a constant switching frequency, predictable funda-
mental and harmonic frequencies are achieved. Other meth-
ods of regulation, such as burst and skip modes, have
frequency spectrums that change with load and can interfere
with sensitive communication equipment.
M9999-042205
10
April 2005
MIC2204
Micrel, Inc.
Package Information
3.15 (0.122)
2.85 (0.114)
DIMENSIONS:
MM (INCH)
4.90 BSC (0.193)
3.10 (0.122)
2.90 (0.114)
1.10 (0.043)
0.94 (0.037)
0.26 (0.010)
0.10 (0.004)
0.30 (0.012)
0.15 (0.006)
0.50 BSC (0.020)
0.15 (0.006)
0.05 (0.002)
6° MAX
0° MIN
0.70 (0.028)
0.40 (0.016)
10-Pin MSOP (MM)
DIMENSIONS: mm
+0.15
0.85
–0.05
+0.15
–0.15
1.60
0.80
+0.15
3.00 BSC.
–0.15
+0.04
1.50 BSC.
1.50 BSC.
0.01
–0.01
0.48 typ.
0.20 dia
PIN 1 ID
+0.07
–0.05
0.23
1
2
3
1
2
3
+0.15
–0.15
1.15
+0.15
2.30
–0.15
3.00 BSC.
0.50 BSC.
+0.15
–0.05
0.40
TOP
BOTTOM
SEATING PLANE
TERMINAL TIP
+0.07
–0.05
0.23
+0.04
–0.01
0.01
0.50 BSC.
0.50 BSC.
TERMINAL TIP
ODD TERMINAL SIDE
EVEN TERMINAL SIDE
10-Pin MLF™ (ML)
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
This 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.
© 2004 Micrel, Incorporated.
April 2005
11
M9999-042205
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