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MIC49150
1.5A Low Voltage LDO Regulator w/Dual Input Voltages
General Description
The MIC49150 is a high-bandwidth, low-dropout, 1.5A voltage regulator ideal for powering core voltages of lowpower microprocessors. The MIC49150 implements a dual supply configuration allowing for very low output impedance and very fast transient response. The MIC49150 requires a bias input supply and a main input supply, allowing for ultra-low input voltages on the main supply rail. The input supply operates from 1.4V to 6.5V and the bias supply requires between 3V and 6.5V for proper operation. The MIC49150 offers fixed output voltages from 0.9V to 1.8V and adjustable output voltages down to 0.9V. The MIC49150 requires a minimum of output capacitance for stability, working optimally with small ceramic capacitors. The MIC49150 is available in an 8-pin power MSOP package and a 5-pin S-Pak. Its operating temperature range is -40C to +125C. Data sheets and support documentation can be found on Micrel's web site at www.micrel.com.
Features
* Input Voltage Range: - VIN: 1.4V to 6.5V - VBIAS: 3.0V to 6.5V * Stable with 1F ceramic capacitor * 1% initial tolerance * Maximum dropout voltage (VIN-VOUT) of 500mV over temperature * Adjustable output voltage down to 0.9V * Ultra fast transient response (Up to 10MHz bandwidth) * Excellent line and load regulation specifications * Logic controlled shutdown option * Thermal shutdown and current limit protection * Power MSOP-8 and S-Pak packages * Junction temperature range: -40C to 125C
Applications
* * * * * * Graphics processors PC add-in cards Microprocessor core voltage supply Low voltage digital ICs High efficiency linear power supplies SMPS post regulators
Typical Application
VIN = 1.8V VBIAS = 3.3V CBIAS = 1F Ceramic CIN = 1F Ceramic MIC49150BR IN OUT BIAS ADJ R2 COUT = 1F Ceramic VOUT = 1.0V R1
GND
Low Voltage, Fast Transient Response Regulator
Micrel Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel +1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com
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Ordering Information
Part Number Standard
MIC49150-0.9BMM MIC49150-1.2BMM MIC49150-1.5BMM MIC49150-1.8BMM MIC49150BMM MIC49150-0.9BR MIC49150-1.2BR MIC49150-1.5BR MIC49150-1.8BR MIC49150BR
Pb-Free / RoHS Compliant
MIC49150-0.9YMM MIC49150-1.2YMM MIC49150-1.5YMM MIC49150-1.8YMM MIC49150YMM MIC49150-0.9WR* MIC49150-1.2WR* MIC49150-1.5WR* MIC49150-1.8WR* MIC49150WR*
Output Current
1.5A 1.5A 1.5A 1.5A 1.5A 1.5A 1.5A 1.5A 1.5A 1.5A
Voltage
0.9V 1.2V 1.5V 1.8V Adj. 0.9V 1.2V 1.5V 1.8V Adj.
Junction Temp. Range
-40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C
Package
8-Pin Power MSOP 8-Pin Power MSOP 8-Pin Power MSOP 8-Pin Power MSOP 8-Pin Power MSOP 5-Pin S-PAK 5-Pin S-PAK 5-Pin S-PAK 5-Pin S-PAK 5-Pin S-PAK
* RoHS Compliant with `high-melting solder' exemption.
Pin Configuration
EN/ADJ. 1 VBIAS 2 VIN 3 VOUT 4 8 GND
TAB
7 GND 6 GND 5 GND
5 4 3 2 1
VOUT VIN GND VBIAS EN/ADJ.
8-Pin Power MSPO (MM)
5-Pin S-Pak (R)
Pin Description
Pin Number 8-MSOP
1
Pin Number 5-SPak
1
Pin Name
EN ADJ
Pin Name
Enable (Input): CMOS compatible input. Logic high = enable, logic low = shutdown. Adjustable regulator feedback input. Connect to resistor voltage divider. Input Bias Voltage for powering all circuitry on the regulator with the exception of the output power device. Input voltage which supplies current to the output power device. Regulator Output. Ground (TAB is connected to ground on S-Pak).
2 3 4 5/6/7/8
2 4 5 3
VBIAS VIN OUT GND
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Absolute Maximum Ratings(1)
Supply Voltage (VIN) .........................................................8V Bias Supply Voltage (VBIAS)..............................................8V Enable Input Voltage (VEN)...............................................8V Power Dissipation .....................................Internally Limited ESD Rating(3) .................................................................. 4kV
Operating Ratings(2)
Supply Voltage (VIN)......................................... 1.4V to 6.5V Bias Supply Voltage (VBIAS)................................. 3V to 6.5V Enable Input Voltage (VEN).................................. 0V to 6.5V Junction Temperature (TJ) ..................-40C TJ +125C Package Thermal Resistance MSOP-8 (JA).....................................................80C/W S-Pak (JC) ..........................................................2C/W
Electrical Characteristics(4)
TA = 25C with VBIAS = VOUT + 2.1V; VIN = VOUT + 1V; bold values indicate -40C< TJ < +125C, unless noted(5).
Parameter
Output Voltage Accuracy Line Regulation Load Regulation Dropout Voltage (VIN - VOUT)
Condition
At 25C Over temperature range VIN = VOUT +1V to 6.5V IL = 0mA to 1.5A IL = 750mA IL = 1.5A
Min
-1 -2
Typ
Max
+1 +2
Units
% % %/V % % mV mV mV mV V V V mA mA mA A A mA mA mA A A V V A V V
-0.1
0.01 0.2 130 280 1.3 1.65 15 15 0.5 9 32
+0.1
1 1.5 200 300 400 500 1.9 2.1 25 30 1 2 15 25 3.4 4
Dropout Voltage (VBIAS - VOUT), Note 5 Ground Pin Current, Note 6
IL = 750mA IL = 1.5A IL = 0mA IL = 1.5A VEN 0.6V, (IBIAS + ICC), Note 7 IL = 0mA IL = 1.5A
Ground Pin Current in Shutdown Current thru VBIAS
Current Limit
MIC49150
1.6
2.3
Enable Input (Note 7)
Enable Input Threshold (Fixed Voltage only) Enable Pin Input Current Regulator enable Regulator shutdown Independent of state 0.891 0.882
1.6 0.6
0.1 0.9 1 0.909 0.918
Reference
Reference Voltage
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. Specification for packaged product only. 5. For VOUT 1V, VBIAS dropout specification does not apply due to a minimum 3V VBIAS input. 6. IGND = IBIAS + (IIN - IOUT). At high loads, input current on VIN will be less than the output current, due to drive current being supplied by VBIAS. 7. Fixed output voltage versions only.
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Typical Characteristics
80 70 60 PSRR (dB) PSRR (dB) 50 40 30 20 10 VBIAS = 3.3V VIN = 1.8V VOUT = 1.0V IOUT = 1.5A COUT = 1F ceramic 0.1 1 10 100 FREQUENCY (kHz) 1000
Power Supply Rejection Ratio (Input Suppl )
80 70 60 50 40 30 20 10
Power Supply Rejection Ratio (Bias Suppl )
DROPOUT VOLTAGE (mV)
300 250 200 150 100 50 0 200
Dropout Voltage (Input Suppl )
1000
1200
1400
0.1 1 10 100 FREQUENCY (kHz)
1000
OUTPUT CURRENT (mA)
1.8 DROPOUT VOLTAGE (V) 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 200 0
Dropout Voltage (Bias Supply)
400 DROPOUT VOLTAGE (mV) 350 300 250 200 150 100 50
Dropout Voltage vs. Temperature (Input Supply)
DROPOUT VOLTAGE (V)
2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4
Dropout Voltage vs. Temperature (Bias Supply)
VIN = 2.5V VOUT = 1.5V 1000 1200 1400 1600 400 600 800
VBIAS = 5V IOUT = 1.5A VOUT = 1. 5V
OUTPUT CURRENT (mA)
0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE(C)
0.2 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE(C)
VIN = 2.5V IOUT = 1.5A VOUT = 1.5V
1.6 OUTPUT VOLTAGE (V) 1.4 1.2 1.0 0.8 0.6 0.4
Dropout Characteristics (Input Voltage)
OUTPUT VOLTAGE (V)
1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0
Dropout Characteristics (Bias Voltage)
OUTPUT VOLTAGE (V)
1.505 1.504 1.503 1.502 1.501 1.500 1.499 1.498 1.497 1.496 0 200 1.495
Load Regulation
IOUT = 10mA
IOUT = 10mA IOUT = 1.5A
IOUT = 1.5A
1000
1200
1400
0 0
0.5 1 1.5 2 INPUT VOLTAGE (V)
2.5
1
2 3 4 5 6 BIAS VOLTAGE (V)
7
OUTPUT CURRENT (mA)
300 BIAS CURRENT (mA) 250 200 150 100 50 0 3
Maximum Bias Current vs. Bias Voltage
300 BIAS CURRENT (mA) 250 200 150 100 50
Maximum Bias Current vs. Temperature
45 40 BIAS CURRENT (mA) 35
Bias Current vs. Temperature
VIN = 2.5V VOUT = 1.5V VBIAS = 5V I = 1500mA
VADJ = 0V IOUT = 1.5A VIN = 2.5V
VBIAS = 5V VADJ = 0V VIN = 2.5V
30 I = 750mA OUT 25 20 15 10 5 IOUT = 100mA
OUT
*Note: Maximum bias current is bias current with input in dropout
3.5
4 4.5 5 5.5 6 BIAS VOLTAGE (V)
6.5
0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE( C)
I = 10mA OUT 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
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1600
400
600
800
VBIAS = 5V 0.2 V OUT = 1.5V
VIN = 2.5V VOUT = 1.5V
VBIAS = 5V VIN = 2.5V
1600
0 0.01
0 0.01
VBIAS = 3.3V VIN = 1.8V VOUT = 1.0V IOUT = 1.5A COUT = 1F ceramic
VBIAS = 5V VOUT = 1.0V 400 600 800
0
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MIC49150
Typical Characteristics (cont.)
50 40 CURRENT (mA) 30 20 10 0
Bias Current vs. Output Current
GROUND CURRENT (mA)
VBIAS = 5V VIN = 2.5V VOUT = 1.5V IBIAS
14 12 10 8 6 4 2 0 3 3.5
Ground Current vs. Bias Voltage
GROUND CURRENT (mA)
14 12 10 8 6 4 2 0 3
Bias Current vs. Bias Voltage
IBIAS
IOUT = 0mA VIN = 2.5V VOUT = 1.5V 4 4.5 5 5.5 6 BIAS VOLTAGE (V) 6.5
IOUT = 100mA VIN = 2.5V VOUT = 1.5V 3.5 4 4.5 5 5.5 6 BIAS VOLTAGE (V) 6.5
0
1000
1200
1400
OUTPUT CURRENT (mA)
50 GROUND CURRENT (mA) 40 30 20 10 0
Bias Current vs. Bias Voltage
GROUND CURRENT (mA) IOUT = 750mA VIN = 2.5V VOUT = 1.5V IBIAS
1600
200
400
600
800
50 40 30 20 10 0
Bias Current vs. Bias Voltage
IBIAS
IOUT = 1500mA VIN = 2.5V VOUT = 1.5V 3.5 4 4.5 5 5.5 6 BIAS VOLTAGE (V) 6.5
3
3.5
4 4.5 5 5.5 6 BIAS VOLTAGE (V)
6.5
3
20 18 VBIAS = 5V 16 VOUT = 1.5V IOUT = 100mA 14 12 10 8 IOUT = 0mA 6 4 2 0 0 0.5 1 1.5 2 2.5 INPUT VOLTAGE (V)
Bias Current vs. Input Voltage
BIAS CURRENT (mA)
300 BIAS CURRENT (mA)
Bias Current vs. Input Voltage
1500mA REFERENCE VOLTAGE (V)
0.901
Reference Voltage vs. Input Voltage
REFERENCE VOLTAGE (V)
VBIAS = 5V
0.901
Reference Voltage vs. Bias Voltage
VIN = 2.5V
VBIAS = 5V 250 VOUT = 1.5V 200 150 100 50 0 0 750mA
0.900
0.900
0.5 1 1.5 2 INPUT VOLTAGE (V)
2.5
0.899 1.4
2.4 3.4 4.4 5.4 INPUT VOLTAGE (V)
6.4
0.899 3
3.5
4 4.5 5 5.5 6 BIAS VOLTAGE (V)
6.5
OUTPUT VOLTAGE (V)
2.5 2.0 1.5 1.0 0.5 VBIAS = 5V VIN = 2.5V VOUT = 0V
ENABLE THRESHOLD (V)
VBIAS = 5V 1.54 VIN = 2.5V 1.53 1.52 1.51 1.50 1.49 1.48 1.47 1.46 1.45 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
SHORT CIRCUIT CURRENT (A)
1.55
Output Voltage vs. Temperature
3.0
Short Circuit Current vs. Temperature
1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 3
Enable Threshold vs. Bias Voltage
ON
OFF
VIN = 2.5V 3.5 4 4.5 5 5.5 6 BIAS VOLTAGE (V) 6.5
0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
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Typical Characteristics (cont.)
1.6 ENABLE THRESHOLD (V) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 VBIAS = 5V VIN = 2.5V OFF
Enable Threshold vs. Temperature
ON
0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
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Functional Characteristics
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Functional Diagram
VBIAS VIN
Ilimit VEN/ADJ Fixed Enable Bandgap
Adj. VIN Open Circuit Fixed R1 VOUT
R2
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MIC49150 type of ceramic capacitors. Z5U and Y5V dielectric capacitors change value by as much as 50% and 60% respectively over their operating temperature ranges. To use a ceramic chip capacitor with Y5V dielectric, the value must be much higher than an X7R ceramic or a tantalum capacitor to ensure the same capacitance value over the operating temperature range. Tantalum capacitors have a very stable dielectric (10% over their operating temperature range) and can also be used with this device. Input Capacitor An input capacitor of 1F or greater is recommended when the device is more than 4" away from the bulk supply capacitance, or when the supply is a battery. Small, surface-mount, ceramic chip capacitors can be used for the bypassing. The capacitor should be placed within 1" of the device for optimal performance. Larger values will help to improve ripple rejection by bypassing the input to the regulator, further improving the integrity of the output voltage. Thermal Design Linear regulators are simple to use. The most complicated design parameters to consider are thermal characteristics. Thermal design requires the following application-specific parameters: * Maximum ambient temperature (TA) * Output current (IOUT) * Output voltage (VOUT) * Input voltage (VIN) * Ground current (IGND) First, calculate the power dissipation of the regulator from these numbers and the device parameters from this datasheet. PD = VIN x IIN + VBIAS x IBIAS - VOUT x IOUT The input current will be less than the output current at high output currents as the load increases. The bias current is a sum of base drive and ground current. Ground current is constant over load current. Then the heat sink thermal resistance is determined with this formula:
TJ(MAX) - TA SA = PD - ( JC + CS )
Application Information
The MIC49150 is an ultra-high performance, low-dropout linear regulator designed for high current applications requiring fast transient response. The MIC49150 utilizes two input supplies, significantly reducing dropout voltage, perfect for low-voltage, DC-to-DC conversion. The MIC49150 requires a minimum of external components and obtains a bandwidth of up to 10MHz. As a Cap regulator, the output is tolerant of virtually any type of capacitor including ceramic type and tantalum type capacitors. The MIC49150 regulator is fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown. Bias Supply Voltage VBIAS, requiring relatively light current, provides power to the control portion of the MIC49150. VBIAS requires approximately 33mA for a 1.5A load current. Dropout conditions require higher currents. Most of the biasing current is used to supply the base current to the pass transistor. This allows the pass element to be driven into saturation, reducing the dropout to 300mV at a 1.5A load current. Bypassing on the bias pin is recommended to improve performance of the regulator during line and load transients. Small ceramic capacitors from VBIAS to ground help reduce high frequency noise from being injected into the control circuitry from the bias rail and are good design practice. Good bypass techniques typically include one larger capacitor such as 1F ceramic and smaller valued capacitors such as 0.01F or 0.001F in parallel with that larger capacitor to decouple the bias supply. The VBIAS input voltage must be 1.6V above the output voltage with a minimum VBIAS input voltage of 3 volts. Input Supply Voltage VIN provides the high current to the collector of the pass transistor. The minimum input voltage is 1.4V, allowing con-version from low voltage supplies. Output Capacitor The MIC49150 requires a minimum of output capacitance to maintain stability. However, proper capacitor selection is important to ensure desired transient response. The MIC49150 is specifically designed to be stable with virtually any capacitance value and ESR. A 1F ceramic chip capacitor should satisfy most applications. Output capacitance can be increased without bound. See "Typical Characteristic" for examples of load transient response. X7R dielectric ceramic capacitors are recommended because of their temperature performance. X7R-type capacitors change capacitance by 15% over their operating temperature range and are the most stable November 2006 9
The heat sink may be significantly reduced in applications where the maximum input voltage is known and large compared with the dropout voltage. Use a series input resistor to drop excessive voltage and distribute the heat between this resistor and the regulator. The low-dropout properties of the MIC49150 allow significant reductions in regulator power dissipation and the associated heat sink without compromising performance. When this technique is employed, a
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Micrel, Inc. capacitor of at least 1F is needed directly between the input and regulator ground. Refer to "Application Note 9" for further details and examples on thermal design and heat sink specification.
MIC49150
MSOP-8
Minimum Load Current The MIC49150, unlike most other high current regulators, does not require a minimum load to maintain output voltage regulation. Power MSOP-8 Thermal Characteristics One of the secrets of the MIC49150's performance is its power MSOP-8 package featuring half the thermal resistance of a standard MSOP-8 package. Lower thermal resistance means more output current or higher input voltage for a given package size. Lower thermal resistance is achieved by joining the four ground leads with the die attach paddle to create a single-piece electrical and thermal conductor. This concept has been used by MOSFET manufacturers for years, proving very reliable and cost effective for the user. Thermal resistance consists of two main elements, JC (junction-to-case thermal resistance) and CA (case-toambient thermal resistance). See Figure 1. JC is the resistance from the die to the leads of the package. CA is the resistance from the leads to the ambient air and it includes CS (case-to-sink thermal resistance) and SA (sink-to-ambient thermal resistance). Using the power MSOP-8 reduces the JC dramatically and allows the user to reduce CA. The total thermal resistance, JA (junction-to-ambient thermal resistance) is the limiting factor in calculating the maximum power dissipation capability of the device. Typically, the power MSOP-8 has a JA of 80C/W, this is significantly lower than the standard MSOP-8 which is typically 160C/W. CA is reduced because pins 5 through 8 can now be soldered directly to a ground plane which significantly reduces the case-to-sink thermal resistance and sink to ambient thermal resistance. Low-dropout linear regulators from Micrel are rated to a maximum junction temperature of 125C. It is important not to exceed this maximum junction temperature during operation of the device. To prevent this maximum junction temperature from being exceeded, the appropriate ground plane heat sink must be used.
q JA qJC qCA
AMBIENT
ground plane heat sink area
printed circuit board
Figure 1. Thermal Resistance
Figure 2 shows copper area versus power dissipation with each trace corresponding to a different temperature rise above ambient. From these curves, the minimum area of copper necessary for the part to operate safely can be determined. The maximum allowable temperature rise must be calculated to determine operation along which curve.
900 800 COPPER AREA (mm2) 700 600 500 400 300 200 100 0 0 0.25 0.50 0.75 1.00 1.25 1.50 POWER DISSIPATION (W)
Figure 2. Copper Area vs. Power-MSOP Power Dissipation (TJA)
900 COPPER AREA (mm2) 800 700 600 500 400 300 200 100 0 0 0.25 0.50 0.75 1.00 1.25 1.50 POWER DISSIPATION (W) TJ = 125C 85C 50C 25C
Figure 3. Copper Area vs. Power-MSOP Power Dissipation (TA)
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Micrel, Inc. T = TJ(max) - TA(max) T J(max) = 125C TA(max) = maximum ambient operating temperature For example, the maximum ambient temperature is 50C, the T is determined as follows: T = 125C - 50C T = 75C Using Figure 2, the minimum amount of required copper can be determined based on the required power dissipation. Power dissipation in a linear regulator is calculated as follows: PD = VIN x IIN + VBIAS x IBIAS - VOUT x IOUT Using a typical application of 750mA output current, 1.2V output voltage, 1.8V input voltage and 3.3V bias voltage, the power dissipation is as follows: PD = (1.8V) x (730mA) + 3.3V(30mA) - 1.2V(750mA) At full current, a small percentage of the output current is supplied from the bias supply, therefore the input current is less than the output current. PD = 513mW From Figure 2, the minimum current of copper required to operate this application at a T of 75C is less than 100mm2.
MIC49150 The JA of this package is ideally 80C/W, but it will vary depending upon the availability of copper ground plane to which it is attached.
Adjustable Regulator Design The MIC49150 adjustable version allows programming the output voltage anywhere between 0.9Vand 5V. Two resistors are used. The resistor value between VOUT and the adjust pin should not exceed 10k. Larger values can cause instability. The resistor values are calculated by:
V R1 = R2 x OUT - 1 0.9 Where VOUT is the desired output voltage.
Enable The fixed output voltage versions of the MIC49150 feature an active high enable input (EN) that allows onoff control of the regulator. Current drain reduces to "zero" when the device is shutdown, with only microamperes of leakage current. The EN input has TTL/CMOS compatible thresholds for simple logic interfacing. EN may be directly tied to VIN and pulled up to the maximum supply voltage.
Quick Method Determine the power dissipation requirements for the design along with the maximum ambient temperature at which the device will be operated. Refer to Figure 3, which shows safe operating curves for three different ambient temperatures: 25C, 50C and 85C. From these curves, the minimum amount of copper can be determined by knowing the maxi-mum power dissipation required. If the maximum ambient temperature is 50C and the power dissipation is as above, 513mW, the curve in Figure 3 shows that the required area of copper is less than 100mm2.
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Package Information
8-Pin MSOP (MM)
5-Pin S-Pak (R)
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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. (c) 2003 Micrel, Incorporated.
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