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MIC49150
Micrel
MIC49150
1.5A Low Voltage LDO Regulator w/Dual Input Voltages Final Information
General Description
The MIC49150 is a high-bandwidth, low-dropout, 1.5A voltage regulator ideal for powering core voltages of low-power 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.
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 MSO-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
Load Transient Response
IN
OUT
R1 VBIAS = 3.3V CBIAS = 1F Ceramic CIN = 1F Ceramic BIAS ADJ R2 COUT = 1F Ceramic
VOUT 50mV/div
VIN = 1.8V
MIC49150BR
VOUT = 1.0V
VBIAS = 3.3V VIN = 1.8V VOUT = 1V COUT = 1F
GND
Low Voltage, Fast Transient Response Regulator
IOUT 1A/div
TIME (10s/div.)
Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 944-0970 * http://www.micrel.com
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MIC49150
MIC49150
Micrel
Ordering Information
Part Number MIC49150-0.9BMM MIC49150-1.5BMM MIC49150BMM MIC49150-0.9BR MIC49150-1.5BR MIC49150BR Output Current 1.5A 1.5A 1.5A 1.5A 1.5A 1.5A Voltage 0.9V 1.5V ADJ. 0.9V 1.5V ADJ. Temperature Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C Package Power MSOP-8 Power MSOP-8 Power MSOP-8 S-Pak-5 S-Pak-5 S-Pak-5
Other voltages available. Contact Micrel for details.
Pin Configuration
EN/ADJ. VBIAS VIN VOUT 1 2 3 4 8 7 6 5 GND GND GND GND
TAB
5 4 3 2 1
VOUT VIN GND VBIAS EN/ADJ.
Power MSOP-8 (MM)
5-Lead S-Pak (R)
Pin Description
MIC49150 MSOP8 1 MIC49150 S-Pak 1 Pin Name Enable ADJ. 3 4 2 5/6/7/8 4 5 2 3 VIN VOUT VBIAS GND Pin Function Enable (Input): CMOS compatible input. Logic high = enable, logic low = shutdown Adjustable regulator feedback input. Connect to resistor voltage divider. Input voltage which supplies current to the output power device. Regulator Output Input Bias Voltage for powering all circuitry on the regulator with the exception of the output power device. Ground (TAB is connected to ground on S-Pak)
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Absolute Maximum Ratings (Note 1)
Supply Voltage (VIN) ....................................................... 8V Bias Supply Voltage (VBIAS) ............................................ 8V Enable Input Voltage (VEN) ............................................. 8V Power Dissipation .................................... Internally Limited ESD Rating, Note 3 ...................................................... 2kV
Operating Ratings (Note 2)
Supply Voltage (VIN) ....................................... 1.4V to 6.5V Bias Supply Voltage (VBIAS) ............................... 3V to 6.5V Enable Input Voltage (VEN) .................................. 0V to VIN Junction Temperature Range ............. -40C TJ +125C Package Thermal Resistance MSOP-8 (JA) ...................................................... 80C/W S-PAK(JC) ............................................................ 2C/W
Electrical Characteristics
TA = 25C with VBIAS = VOUT +2.1V; VIN = VOUT + 1V; bold values indicate -40C < TJ < +125C, Note 4; unless otherwise specified. Parameter Output Voltage Accuracy Line Regulation Load Regulation Dropout Voltage (VIN - VOUT) Conditions At 25C Over temperature range VIN = 3.0V to 6.5V IL = 0mA to 1.5A IL = 750mA IL = 1.5A Dropout Voltage (VBIAS - VOUT) Note 4 Ground Pin Current, Note 5 IL = 750mA IL = 1.5A IL = 0mA IL = 1.5A VEN 0.6V, (IBIAS + ICC), Note 6 IL = 0mA IL = 1.5A Current Limit Enable Input, Note 6 Enable Input Threshold (Fixed Voltage only) Enable Pin Input Current Reference Reference Voltage
Note 1. Note 2. Note 3. Note 4. Note 5. Note 6. Exceeding the absolute maximum rating may damage the device. The device is not guaranteed to function outside its operating rating. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. For VOUT 1V, VBIAS dropout specification does not apply due to a minimum 3V VBIAS input. 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. Fixed output voltage versions only.
Min -1 -2 -0.1
Typ
Max +1 +2
Units % % %/V % % mV mV mV mV V V V mA mA mA A A mA mA mA A A
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 3.5 4
Ground Pin Current in Shutdown Current thru VBIAS
MIC49150
1.6
2.3
Regulator enable Regulator shutdown Independent of state
1.6 0.6 0.1 1
V V A
0.891 0.882
0.9
0.909 0.918
V V
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Functional Diagram
VBIAS VIN
Ilimit VEN/ADJ Fixed Enable Bandgap
Adj. VIN Open Circuit Fixed VOUT R1
R2
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Typical Characteristics
Power Supply Rejection Ratio (Input Supply)
80 70 60
Power Supply Rejection Ratio (Bias Supply)
80 70 60
PSRR (dB) DROPOUT VOLTAGE (mV)
300 250 200 150 100 50
Dropout Voltage (Input Supply)
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
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
VBIAS = 5V VOUT = 1.0V
1000
1200
1400
1400
OUTPUT CURRENT (mA)
Dropout Voltage (Bias Supply)
1.8
DROPOUT VOLTAGE (mV)
Dropout Voltage vs. Temperature (Input Supply)
400
DROPOUT VOLTAGE (V)
Dropout Voltage vs. Temperature (Bias Supply)
2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 VIN = 2.5V IOUT = 1.5A VOUT = 1.5V
DROPOUT VOLTAGE (V)
1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 VIN = 2.5V VOUT = 1.5V
350 300 250 200 150 100 50 VBIAS = 5V IOUT = 1.5A VOUT = 1.5V
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)
0
1000
1200
1400
OUTPUT CURRENT (mA)
Dropout Characteristics (Input Voltage)
1.6 1.6 I OUTPUT VOLTAGE (V)
1600
200
400
600
800
Dropout Characteristics (Bias Voltage)
1.505
OUTPUT VOLTAGE (V) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 1 VIN = 2.5V VOUT = 1.5V 2 3 4 5 6 BIAS VOLTAGE (V) 7 IOUT = 1.5A IOUT = 10mA
Load Regulation
1.504 1.503 1.502 1.501 1.500 1.499 1.498 1.497 1.496 1.495 VBIAS = 5V VIN = 2.5V
1000 1200 1600 200 400 600 800
OUTPUT VOLTAGE (V)
1.4 1.2 1.0 0.8 0.6 0.4
OUT
= 10mA
IOUT = 1.5A
VBIAS = 5V 0.2 V OUT = 1.5V 0 0 0.5 1 1.5 2 INPUT VOLTAGE (V) 2.5
0
OUTPUT CURRENT (mA)
Maximum Bias Current vs. Bias Voltage
300 BIAS CURRENT (mA) 300 250 200 150 100 50 0 3
*Note: Maximum bias current is bias current with input in dropout
Maximum Bias Current vs. Temperature
250 200 150 100 50 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE(C) VBIAS = 5V VADJ = 0V VIN = 2.5V
45 40 BIAS CURRENT (mA) 35
Bias Current vs. Temperature
VIN = 2.5V VOUT = 1.5V VBIAS = 5V IOUT = 1500mA
BIAS CURRENT (mA)
VADJ = 0V IOUT = 1.5A VIN = 2.5V
30 I = 750mA OUT 25 20 15 10 5 IOUT = 100mA
3.5
4 4.5 5 5.5 6 BIAS VOLTAGE (V)
6.5
IOUT = 10mA 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
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MIC49150
1600
200
400
600
800
0 0.01
0 0.01
0
0
MIC49150
Micrel
Bias Current vs. Output Current
50
Ground Current vs. Bias Voltage
14
GROUND CURRENT (mA) GROUND CURRENT (mA)
Bias Current vs. Bias Voltage
14 12 10 8 6 4 2 0 3 3.5 IOUT = 100mA VIN = 2.5V VOUT = 1.5V 4 4.5 5 5.5 6 BIAS VOLTAGE (V) 6.5 IBIAS
40
CURRENT (mA)
VBIAS = 5V VIN = 2.5V VOUT = 1.5V IBIAS
12 10 8 6 4 2 0 3 3.5 IOUT = 0mA VIN = 2.5V VOUT = 1.5V 4 4.5 5 5.5 6 BIAS VOLTAGE (V) 6.5
30 20 10 0
0
1000
1200
1400
OUTPUT CURRENT (mA)
Bias Current vs. Bias Voltage
50 GROUND CURRENT (mA)
GROUND CURRENT (mA)
1600
200
400
600
800
Bias Current vs. Bias Voltage
50 40 30 20 10 0 IOUT = 1500mA VIN = 2.5V VOUT = 1.5V 3.5 4 4.5 5 5.5 6 BIAS VOLTAGE (V) 6.5
BIAS CURRENT (mA)
40 30 20 10 0 IBIAS
IOUT = 750mA VIN = 2.5V VOUT = 1.5V
IBIAS
20 18 VBIAS = 5V VOUT = 1.5V 16 14 12 10 8 6 4 2 0 0
Bias Current vs. Input Voltage
I
OUT
= 100mA
IOUT = 0mA
3
3.5
4 4.5 5 5.5 6 BIAS VOLTAGE (V)
6.5
3
0.5 1 1.5 2 INPUT VOLTAGE (V)
2.5
300
Bias Current vs. Input Voltage
REFERENCE VOLTAGE (V) 1500mA
0.901
Reference Voltage vs. Input Voltage
VBIAS = 5V REFERENCE VOLTAGE (V)
0.901
Reference Voltage vs. Bias Voltage
VIN = 2.5V
BIAS CURRENT (mA)
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
ENABLE THRESHOLD (V)
OUTPUT VOLTAGE (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 2.5 2.0 1.5 1.0 0.5
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
VBIAS = 5V VIN = 2.5V VOUT = 0V
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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Enable Threshold vs. Temperature
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 ON
0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
Functional Characteristics
Load Transient Response
OUTPUT VOLTAGE 50mV/div OUTPUT VOLTAGE 20mV/div
Bias Voltage Line Transient Response
BIAS VOLTAGE 2V/div
VBIAS = 3.3V VIN = 1.8V VOUT = 1V COUT = 1F ceramic
VBIAS = 6.5V
VBIAS = 3.3V
OUTPUT CURRENT 1A/div
VIN = 1.8V VOUT = 1V COUT = 1F ceramic IOUT = 1.5A TIME (400s/div.)
TIME (10s/div.)
Input Voltage Line Transient Response
OUTPUT VOLTAGE 20mV/div
VIN = 6.5V
INPUT VOLTAGE 2V/div
VIN = 1.8V VBIAS = 3.3V VOUT = 1V COUT = 1F ceramic IOUT = 1.5A TIME (400s/div.)
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MIC49150
MIC49150
Micrel
Input Capacitor An input capacitor of 1F or greater is recommended when the device is more than 4 inches away from the bulk supply capacitance, or when the supply is a battery. Small, surfacemount, 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
Applications 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 300mVat 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 a 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 conversion 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 characteristics 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 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. MIC49150 8
(
)
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 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. 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.
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MIC49150
Lower thermal resistance is achieved by joining the four ground leads with the die attach paddle to create a singlepiece 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-to-ambient 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-tosink 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.
900
Micrel
40C 50C 55C 65C 75C 85C
T = 125C J 85C 50C 25C
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)
900 800
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 3. Copper Area vs. Power-MSOP Power Dissipation (TA) T = TJ(max) - TA(max) TJ(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.
MSOP-8
JA JC CA
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.
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100C
MIC49150
MIC49150
Quick Method
Micrel
Enable The fixed output voltage versions of the MIC49150 feature an active high enable input (EN) that allows on-off 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
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 maximum 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. 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.
MIC49150
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Package Information
0.122 (3.10) 0.112 (2.84)
0.199 (5.05) 0.187 (4.74)
DIMENSIONS: INCH (MM)
0.120 (3.05) 0.116 (2.95) 0.036 (0.90) 0.032 (0.81) 0.043 (1.09) 0.038 (0.97) 0.012 (0.30) R
0.007 (0.18) 0.005 (0.13)
0.012 (0.3) 0.0256 (0.65) TYP
0.008 (0.20) 0.004 (0.10)
5 MAX 0 MIN
0.012 (0.03) R 0.039 (0.99) 0.035 (0.89) 0.021 (0.53)
8-Lead MSOP (MM)
0.3700.005 9.3950.125 0.3550.005 9.0150.125 0.256 6.50 0.0750.005 1.9050.125 0.010 0.250
0.0400.010 1.0150.255
0.3150.005 8.0000.130
0.0400.005 1.0150.125 0.4150.005 10.540.130 0.0030.002 0.0800.050
INCHES MILLIMETER
0.067 1.700
0.0280.003 0.7100.080
0.010 0.250
0.0360.005 0.9150.125 0 min 6 max
5-Lead S-Pak (R)
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MIC49150
Micrel
MICREL INC. 1849 FORTUNE DRIVE
TEL
SAN JOSE, CA 95131
WEB
USA
+ 1 (408) 944-0800
FAX
+ 1 (408) 944-0970
http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. (c) 2002 Micrel Incorporated
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