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MIC5236
Micrel
MIC5236
Low Quiescent Current Cap LDO Regulator Preliminary Information
General Description
The MIC5236 is a low quiescent current, Cap low-dropout regulator. With a maximum operating input voltage of 30V and a quiescent current of 20A, it is ideal for supplying keepalive power in systems with high-voltage batteries. Capable of 150mA output, the MIC5236 has a dropout voltage of only 300mV. It can also survive an input transient of -20V to +60V. As a Cap LDO, the MIC5236 is stable with either a ceramic or a tantalum output capacitor. It only requires a 1.0F output capacitor for stability. The MIC5236 includes a logic compatible enable input and an undervoltage error flag indicator. Other features of the MIC5236 include thermal shutdown, current-limit, overvoltage shutdown, load-dump protection, reverse leakage protections, and reverse battery protection. Available in the thermally enhanced SOP-8 and MSOP-8, the MIC5236 comes in fixed 2.5V, 3.0V, 3.3V, 5.0V, and adjustable voltages. For other output voltages, contact Micrel.
Features
* Ultra-low quiescent current (IQ = 20A @IO = 100A) * Wide input range: 2.3V to 30V * Low dropout: 230mV @50mA; 300mV @150mA * Fixed 2.5V, 3.0V, 3.3V, 5.0V, and Adjustable outputs * 1.0% initial output accuracy * Stable with ceramic or tantalum output capacitor * Load dump protection: -20V to +60V input transient survivability * Logic compatible enable input * Low output flag indicator * Overcurrent protection * Thermal shutdown * Reverse-leakage protection * Reverse-battery protection * High-power SOP-8 and MSOP-8
Applications
* Keep-alive supply in notebook and portable personal computers * Logic supply from high-voltage batteries * Automotive electronics * Battery-powered systems
Typical Application
VIN 30V MIC5236 OUT ERR GND VOUT 3.0V/100A IGND = 20A VIN 5V MIC5236 OUT 47k EN ERR GND VOUT 3.0V/150mA COUT VERR
IN
IN
EN
Regulator with Low IO and Low IQ
VIN 5V MIC5236 IN OUT EN ADJ GND
Regulator with Error Output
VOUT 3.0V/150mA
Regulator with Adjustable Output
Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 944-0970 * http://www.micrel.com
November 2000
1
MIC5236
MIC5236
Micrel
Ordering Information
Part Number * MIC5236-5.0BM MIC5236-5.0BMM MIC5236-3.3BM MIC5236-3.3BMM MIC5236-3.0BM MIC5236-3.0BMM MIC5236-2.5BM MIC5236-2.5BMM MIC5236BM MIC5236BMM Voltage 5.0V 5.0V 3.3V 3.3V 3.0V 3.0V 2.5V 2.5V ADJ ADJ Junction Temp. Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C Package 8-lead SOIC 8-lead MSOP 8-lead SOIC 8-lead MSOP 8-lead SOIC 8-lead MSOP 8-lead SOIC 8-lead MSOP 8-lead SOIC 8-lead MSOP
*Conta5ct factory regarding availablity for voltages not listed
Pin Configuration
ERR 1 IN 2 OUT 3 EN 4
8 GND 7 GND 6 GND 5 GND
ADJ 1 IN 2 OUT 3 EN 4
8 GND 7 GND 6 GND 5 GND
8-Pin SOIC (M) 8-Pin MSOP (MM)
8-Pin SOIC (M) 8-Pin MSOP (MM)
Pin Description
Pin Number Pin Number 1 Pin Name /ERR Pin Function Error (Output): Open-collector output is active low when the output is out of regulation due to insufficient input voltage or excessive load. An external pull-up resistor is required. Adjustable Feedback Input. Connect to voltage divider network. Power supply input. Regulated Output Enable (Input): Logic low = shutdown; logic high = enabled. Ground: Pins 5, 6, 7, and 8 are internally connected in common via the leadframe.
1 2 3 4 5-8 2 3 4 5-8
ADJ IN OUT EN GND
MIC5236
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MIC5236
Micrel
Absolute Maximum Ratings (Note 1)
Supply Voltage (VIN), Note 3 ........................ -20V to +60V Power Dissipation (PD), Note 4 ............... Internally Limited Junction Temperature (TJ) ...................................... +150C Storage Temperature (TS) ....................... -65C to +150C Lead Temperature (soldering, 5 sec.) ....................... 260C ESD Rating, Note 5
Operating Ratings (Note 2)
Supply Voltage (VIN) ................................... + 2.3V to +30V Junction Temperature (TJ) ....................... -40C to +125C Package Thermal Resistance MSOP (JA) ......................................................... 80C/W SOIC (JA) ........................................................... 63C/W
Electrical Characteristics
VIN = 6.0V; VEN = 2.0V; COUT = 4.7F, IOUT = 100A; TJ = 25C, bold values indicate -40C TJ +125C; unless noted. Symbol VOUT VOUT/T VOUT/VOUT VOUT/VOUT Parameter Output Voltage Accuracy Output Voltage Temperature Coefficient Line Regulation Load Regulation Conditions variation from nominal VOUT Note 6 VIN = VOUT + 1V to 30V IOUT = 100A to 50mA, Note 7 IOUT = 100A to 150mA, Note 7 V Dropout Voltage, Note 8 IOUT = 100A IOUT = 50mA IOUT = 100mA IOUT = 150mA IGND Ground Pin Current VEN 2.0V, IOUT = 100A VEN 2.0V, IOUT = 50mA VEN 2.0V, IOUT = 100mA VEN 2.0V, IOUT = 150mA IGND(SHDN) ISC en /ERR Output V/ERR VOL ILEAK Enable Input VIL VIH Input Low Voltage Input High Voltage regulator off regulator on 2.0 0.6 V V Low Threshold High Threshold /ERR Output Low Voltage /ERR Output Leakage % of VOUT % of VOUT VIN = VOUT(nom) - 0.12VOUT, IOL = 200A VOH = 30V 90 94 95 150 0.1 98 250 400 1 2 % % mV mV A A Ground Pin in Shutdown Short Circuit Current Output Noise VEN 0.6V, VIN = 30V VOUT = 0V 10Hz to 100kHz, VOUT = 3.0V, CL = 1.0F Min -1 -2 50 0.2 0.15 0.3 50 230 270 300 20 0.5 1.5 2.8 0.1 260 160 4.0 5.0 1 350 500 30 0.8 0.5 1.0 0.3 0.5 0.6 1.0 100 400 Typ Max 1 +2 Units % % ppm/C % % % % % % mV mV mV mV A mA mA mA mA A mA Vrms
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MIC5236
MIC5236
Symbol IIN Parameter Enable Input Current Conditions VEN = 0.6V, regulator off VEN = 2.0V, regulator on VEN = 30V, regulator on
Note 1. Note 2. Note 3: Note 4: Exceeding the absolute maximum rating may damage the device. The device is not guaranteed to function outside its operating rating.
Micrel
Min Typ 0.01 0.15 0.5 Max 1.0 2.0 1.0 2.0 2.5 5.0 Units A A A A A A
The absolute maximum positive supply voltage (60V) must be of limited duration (100ms) and duty cycle (1%). The maximum continuous supply voltage is 30V. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = (TJ(max) - TA) / JA. Exceeding the maximum allowable power dissipation will result in excessive die termperature, and the regulator will go into thermal shutdown. The JA of the MIC5236-x.xBM (all versions) is 63C/W, and the MIC5236-x.xBMM (all versions) is 80C/W, mounted on a PC board (see "Thermal Characteristics" for further details). Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. Output voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range. Regulation is measured at constant junction temperature using pulse testing with a low duty-cycle. Changes in output voltage due to heating effects are covered by the specification for thermal regulation. Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1.0V differential.
Note 5. Note 6: Note 7: Note 8:
MIC5236
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MIC5236
Micrel
Typical Characteristics
Dropout Voltage vs. Output Current
400
Dropout Characteristics
3.5
600
Dropout Voltage vs. Temperature
DROPOUT VOLTAGE (mV)
500 400 300 200 100 MIC5236-3.0 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) ILOAD = 150mA
DROPOUT VOLTAGE (mV)
OUTPUT VOLTAGE (V)
3.0 2.5 2.0
ILOAD = 10mA ILOAD = 50mA
300
200
ILOAD = 150mA 1.5 1.0 1.5 ILOAD = 100mA MIC5236-3.0 2.0 2.5 3.0 3.5 4.0
100
VOUT = 98% of Nominal VOUT MIC5236-3.0 0 40 80 120 160 200
0
OUTPUT CURRENT (mA)
SUPPLY VOLTAGE (V)
Ground Current vs. Output Current
4 25
Ground Pin Current vs. Output Current
5
Ground Current vs. Supply Voltage
GROUND CURRENT (mA)
MIC5236-3.0 4 ILOAD = 150mA 3 VOUT = 3V 2 1 0 ILOAD = 100A 0 1 2 3 4 5 6 7 8
GROUND PIN CURRENT (mA)
GROUND PIN CURRENT (A)
MIC5236-3.0 3
20 15 10 5
VIN = 4V VIN = 10V
2
VIN = 4V
1
VIN = 10V
MIC5236-3.0 0 0 100 200 300 400 500
0
0
20 40 60 80 100 120 140 160 OUTPUT CURRENT (mA)
OUTPUT CURRENT (A)
SUPPLY VOLTAGE (V)
Ground Current vs. Supply Voltage
100
0.10
Ground Current vs. Temperature
1.2
Ground Current vs. Temperature
GROUND CURRENT (mA)
1.0 0.8 VIN = 4V 0.6 0.4 0.2 MIC5236-3.0 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) ILOAD = 75mA
GROUND PIN CURRENT (A)
GROUND CURRENT (mA)
90 80 70 60 50 40 30 20 10 0 0
MIC5236-3.0 ILOAD = 10mA
0.08 0.06 0.04 0.02 MIC5236-3.0 0 -40 -20 0 20 40 60 80 100 120 VIN = 4V ILOAD = 10mA
1mA 100A
10A 1 2 3 4 5 6 7 8
SUPPLY VOLTAGE (V)
TEMPERATURE (C)
Ground Current vs. Temperature
4 3.015
Output Voltage vs. Temperature
MIC5236-3.0
Short Circuit Current vs. Temperature
SHORT CIRCUIT CURRENT (mA)
285 280 275 270 265 260 MIC5236-3.0 255 -40 -20 0 20 40 60 80 100 120 VOUT = 0V
GROUND CURRENT (mA)
3 VIN = 4V 2 ILOAD = 150mA
VOLTAGE OUTPUT (V)
3.010 3.005 3.000 2.995 2.990 2.985 -40 -20 0 20 40 60 80 100 120 VIN = 4V ILOAD = 150mA
1 MIC5236-3.0 0 -40 -20 0 20 40 60 80 100 120
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
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MIC5236
MIC5236
Micrel
Line Regulation
3.018
Overvoltage Threshold vs. Temperature
41
INPUT VOLTAGE (V)
3.5
Current Limit vs. Output Voltage
OUTPUT VOLTAGE (V)
3.0 2.5 2.0 1.5 1.0 0.5 MIC5236-3.0 0 0 100 200 300 400
VOLTAGE OUTPUT (V)
3.016 3.014 3.012 3.010 3.008 3.006 3.004 3.002 0
MIC5236-3.0
MIC5236-3.0 40 39 38 37 36 -40 -20 0
ILOAD = 10mA
5
10
15
20
25
30
35
20 40 60 80 100 120
INPUT VOLTAGE (V)
TEMPERATURE (C)
CURRENT LIMIT (mA)
Input Current
120 OUTPUT-LOW VOLTAGE (V) MIC5236-3.0 INPUT CURRENT (mA) 100 VEN = 5V 80 R = 30 L 60 40 20 0 -30 -20 -10 0 INPUT VOLTAGE (V) 10 3.0 2.5 2.0 1.5 1.0 0.5 0 0
Dropout Induced Error Flag
MIC5236-3.0 VIN = 2.7V VOUT =2.62V No Load OUTPUT-LOW VOLTAGE (V)
1.25 1.00 0.75 0.50 0.25
Current Limit Induced Error Flag
VIN = 6V VOUT = 2.03V RL = 6
MIC5236-3.0 0 0 0.5 1.0 1.5 2.0 2.5 SINK CURRENT (mA) 3.0
0.5 1.0 1.5 SINK CURRENT (mA)
2.0
Reverse Current (Open Input)
60 REVERSE CURRENT (A) REVERSE CURRENT (A) 50 40 30 20 10 0 0 +85C 5 10 15 20 EXTERNAL VOLTAGE (V) +25C Note 10 -40C 70 60 50 40 30 20 10 0 0
Reverse Current (Grounded Input)
Note 11 -40C
+25C
+85C 5 10 15 20 EXTERNAL VOLTAGE (V)
Note 10
MIC5236 IN OUT
Reverse Current
Note 11
MIC5236 IN OUT
Reverse Current
EN GND
EN GND
MIC5236
6
November 2000
MIC5236
Micrel
Functional Characteristics
Enable Transient Response Load Transient Response
VOUT (2V/div.)
VOUT (100mV/div.)
VEN (5V/div.)
VIN = 5V IL = 10mA
TIME (250s/div.)
IOUT (100mA/div.)
VIN = 4V VOUT = 3V COUT = 15F ESR = 200m
TIME (250s/div.)
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MIC5236
MIC5236
Micrel
Functional Diagram
IN EN RFB1 Error Amplifier RFB2 RFB3 ERR VREF 1.23V MIC5236-x.x GND Error Comparator OUT
MIC5236
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MIC5236
Micrel
Error Detection Comparator Output The ERR pin is an open collector output which goes low when the output voltage drops 5% below it's internally programmed level. It senses conditions such as excessive load (current limit), low input voltage, and over temperature conditions. Once the part is disabled via the enable input, the error flag output is not valid. Overvoltage conditions are not reflected in the error flag output. The error flag output is also not valid for input voltages less than 1.3V. The error output has a low voltage of 400mV at a current of 200A. In order to minimize the drain on the source used for the pull-up, a value of 200k to 1M is suggested for the error flag pull-up. This will guarantee a maximum low voltage of 0.4V for a 30V pull-up potential. An unused error flag can be left unconnected.
4.75V
Application Information
The MIC5236 provides all of the advantages of the MIC2950: wide input voltage range, load dump (positive transients up to 60V), and reversed-battery protection, with the added advantages of reduced quiescent current and smaller package. Additionally, when disabled, quiescent current is reduced to 0.1A. Enable A low on the enable pin disables the part, forcing the quiescent current to less than 0.1A. Thermal shutdown and the error flag are not functional while the device is disabled. The maximum enable bias current is 2A for a 2.0V input. An open collector pull-up resistor tied to the input voltage should be set low enough to maintain 2V on the enable input. Figure 1 shows an open collector output driving the enable pin through a 200k pull-up resistor tied to the input voltage. In order to avoid output oscillations, slow transitions from low to high should be avoided.
200k VIN 5V MIC5236 IN OUT 200k EN
SHUTDOWN ENABLE
Output Voltage Error Output
0V VALID ERROR NOT VALID NOT VALID
VERR VOUT COUT
ERR GND
Input Voltage
5V 1.3V 0V
Figure 3. Error Output Timing Figure 1. Remote Enable Reverse Current Protection The MIC5236 is designed to limit the reverse current flow from output to input in the event that the MIC5236 output has been tied to the output of another power supply. See the graphs detailing the reverse current flow with the input grounded and open. Thermal Shutdown The MIC5236 has integrated thermal protection. This feature is only for protection purposes. The device should never be intentionally operated near this temperature as this may have detrimental effects on the life of the device. The thermal shutdown may become inactive while the enable input is transitioning a high to a low. When disabling the device via the enable pin, transition from a high to low quickly. This will insure that the output remains disabled in the event of a thermal shutdown. Current Limit Figure 4 displays a method for reducing the steady state short circuit current. The duration that the supply delivers current is set by the time required for the error flag output to discharge the 4.7F capacitor tied to the enable pin. The off time is set by the 200K resistor as it recharges the 4.7F capacitor, enabling the regulator. This circuit reduces the short circuit current from 280mA to 15mA while allowing for regulator restart once the short is removed.
Input Capacitor An input capacitor may be required when the device is not near the source power supply or when supplied by a battery. Small, surface mount, ceramic capacitors can be used for bypassing. Larger values may be required if the source supply has high ripple. Output Capacitor The MIC5236 has been designed to minimize the effect of the output capacitor ESR on the closed loop stability. As a result, ceramic or film capacitors can be used at the output. Figure 2 displays a range of ESR values for a 10F capacitor. Virtually any 10F capacitor with an ESR less than 3.4 is sufficient for stability over the entire input voltage range. Stability can also be maintained throughout the specified load and line conditions with 1F film or ceramic capacitors.
OUTPUT CAPACITOR ESR ()
5 4 3 Stable Region 2 1 0 TJ = 25C VOUT = 10F 5 10 15 20 25 30
INPUT VOLTAGE (V)
Figure 2. Output Capacitor ESR
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MIC5236
MIC5236
1N4148 200k VIN 5V MIC5236 IN OUT 200k EN
SHUTDOWN ENABLE
Micrel
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
COPPER AREA (mm2)
VERR VOUT COUT
ERR GND
4.7F
700 600 500 400 300 200 100 0 0
Thermal Characteristics The MIC5236 is a high input voltage device, intended to provide 150mA of continuous output current in two very small profile packages. The power SOP-8 and power MSOP-8 allow the device to dissipate about 50% more power than their standard equivalents.
Power SOP-8 Thermal Characteristics
0.25 0.50 0.75 1.00 1.25 1.50 POWER DISSIPATION (W)
One of the secrets of the MIC5236's performance is its power SO-8 package featuring half the thermal resistance of a standard SO-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 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 5. 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).
Figure 6. Copper Area vs. Power-SOP Power Dissipation (TJA) Figure 6 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. 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 6, 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 - VOUT) IOUT + VIN * IGND If we use a 3V output device and a 28V input at moderate output current of 25mA, then our power dissipation is as follows: PD = (28V - 3V) x 25mA + 28V x 250A PD = 625mW + 7mW PD = 632mW From Figure 6, the minimum amount of copper required to operate this application at a T of 75C is 25mm2. 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 7, which shows safe operating curves for three different ambient temperatures: 25C, 50C and 85C. From these curves, the minimum 10 November 2000
SOP-8
JA JC CA
AMBIENT
ground plane heat sink area
printed circuit board
Figure 5. Thermal Resistance Using the power SOP-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 SOP-8 has a JC of 20C/W, this is significantly lower than the standard SOP-8 which is typically 75C/W. CA is reduced because pins 5 MIC5236
40C 50C 55C 65C 75C 85C
800
100C
Figure 4. Remote Enable with Short-Circuit Current Foldback
MIC5236
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, 632mW, the curve in Figure 7 shows that the required area of copper is 25mm2. The JA of this package is ideally 63C/W, but it will vary depending upon the availability of copper ground plane to which it is attached.
900 800
COPPER AREA (mm2)
Micrel
The same method of determining the heat sink area used for the power-SOP-8 can be applied directly to the powerMSOP-8. The same two curves showing power dissipation versus copper area are reproduced for the power-MSOP-8 and they can be applied identically, see Figures 8 and 9.
900 800
COPPER AREA (mm2)
T = 125C J 85C 50C 25C
700 600 500 400 300 200 100 0 0
T = 125C J 85C 50C 25C
700 600 500 400 300 200 100 0 0
0.25 0.50 0.75 1.00 1.25 1.50 POWER DISSIPATION (W)
0.25 0.50 0.75 1.00 1.25 1.50 POWER DISSIPATION (W)
Figure 9. Copper Area vs. Power-MSOP Power Dissipation (TA)
Power MSOP-8 Thermal Characteristics
Figure 7. Copper Area vs. Power-SOP Power Dissipation (TA)
900
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 8. Copper Area vs. Power-MSOP Power Dissipation (TJA)
November 2000
40C 50C 55C 65C 75C 85C
800
The power-MSOP-8 package follows the same idea as the power-SO-8 package, using four ground leads with the die attach paddle to create a single-piece electrical and thermal conductor, reducing thermal resistance and increasing power dissipation capability. 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 9, 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 639mW, the curve in Figure 9 shows that the required area of copper is 110mm2,when using the power MSOP-8.
100C
11
MIC5236
MIC5236
Micrel
Package Information
0.026 (0.65) MAX)
PIN 1
0.157 (3.99) 0.150 (3.81)
DIMENSIONS: INCHES (MM)
0.050 (1.27) TYP
0.020 (0.51) 0.013 (0.33) 0.0098 (0.249) 0.0040 (0.102) 0-8 SEATING PLANE 45 0.010 (0.25) 0.007 (0.18)
0.064 (1.63) 0.045 (1.14)
0.197 (5.0) 0.189 (4.8)
0.050 (1.27) 0.016 (0.40) 0.244 (6.20) 0.228 (5.79)
8-Lead SOIC (M)
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 (0.03) 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)
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
USA
+ 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB 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) 2000 Micrel Incorporated
MIC5236
12
November 2000

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