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MIC2954
Micrel
MIC2954
250mA Low-Dropout Regulator
General Description
The MIC2954 is a "bulletproof" efficient voltage regulator with very low dropout voltage (typically 40mV at light loads and 375mV at 250mA), and low quiescent current (120A typical). The quiescent current of the MIC2954 increases only slightly in dropout, thus prolonging battery life. Key MIC2954 features include protection against reversed battery, foldback current limiting, and automotive load dump protection (60V positive transient). The MIC2954-07/08BM is an adjustable version that includes an error flag output that warns of a low output voltage, which is often due to failing batteries on the input. This may also be used as a power-on reset. A logic-compatible shutdown input is provided which enables the regulator to be switched on and off. This part may be pin-strapped for 5V output, or programmed from 1.24V to 29V with the use of two external resistors. The MIC2954 is available in two voltage tolerances, 0.5% maximum and 1% maximum. Both are guaranteed for junction temperatures from -40C to +125C. The MIC2954 has a very low output voltage temperature coefficient and extremely good load and line regulation (0.04% typical).
Features
* * * * * * * * * * * High-accuracy 5V, guaranteed 250mA output Low quiescent current Low dropout voltage Extremely tight load and line regulation Very low temperature coefficient Current and thermal limiting Input can withstand -20V reverse battery and +60V positive transients Error flag warns of low output voltage Logic-controlled electronic shutdown Output programmable from 1.24V to 29V (MIC2954-07/08) Available in TO-220, TO-92, and surface-mount SOT-223 and SOP-8 packages Battery powered equipment Cellular telephones Laptop, notebook, and palmtop computers PCMCIA VCC and VPP regulation/switching Bar code scanners Automotive electronics SMPS post-regulator/dc-to-dc modules Voltage reference High-efficiency linear power supplies
Applications
* * * * * * * * *
Typical Applications
100k VIN MIC2954 IN OUT GND 2.2F VOUT VIN MIC2954
8 3 SHUTDOWN ENABLE
VERR VOUT 1.2V to 30V R1 10F R2
IN OUT SHDN ERR FB GND
4
1 5 7
100pF VREF
2, 6 = OPEN
5V Fixed Regulator
R1 VOUT = VREF 1 + R2
Adjustable Regulator
VIN MIC2954-07/-08 +7V 8 1 IN OUT 3 5 SHDN ERR
SHUTDOWN ENABLE
100pF
VOUT 5V or 3.3V 300k 1% 3.3F 180k 1%
SHUTDOWN ENABLE
VIN
MIC2954-07/-08
8 3
FB GND
4
7
OUT SHDN ERR FB GND
4
IN
1 5 7
VOUT VIN*
* MINIMUM INPUT-TO-OUTPUT VOLTAGE RANGES FROM 40mV TO 400mV DEPENDING UPON LOAD CURRENT
220k 1% 470k
5V 3.3V
Q1 ON = 3.3V Q1 OFF = 5.0V
Q1 2N2222
Wide Input-Voltage-Range Current Limiter 5V or 3V Selectable Regulator with Shutdown
Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 944-0970 * http://www.micrel.com
August 1999
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MIC2954
MIC2954
Micrel
Ordering Information
Part Number MIC2954-02BT MIC2954-03BT MIC2954-02BS MIC2954-03BS MIC2954-02BZ MIC2954-03BZ MIC2954-07BM MIC2954-08BM Accuracy 0.5% 1.0% 0.5% 1.0% 0.5% 1.0% 0.5% 1.0% Junc. 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 Package TO-220 TO-220 SOT-223 SOT-223 TO-92 TO-92 SOP-8 SOP-8
Pin Configuration
MIC2954
OUT SNS SHDN GND 1 2 3 4 8 7 6 5 IN FB TAP ERR
1
GND
TAB
2
3
IN
GND OUT
SOP-8 (M)
SOT-223 (S)
3
2
1
TAB
3 2 1
OUT GND IN
OUT GND
IN
TO-92 (Z)
TO-220 (T)
Pin Description
Pin No. SOT-223 1 2, TAB 3 Pin No. SOP-8 8 4 1 2 Pin No. TO-220 1 2 3 Pin No. TO-92 1 2 3 Pin Name IN GND OUT SNS Pin Function Supply Input Ground Regulator Output Sense (Input): Output-sense-voltage end of internal resistive divider. Connect to OUT (VOUT = 5V) for fixed 5V operation; also see TAP. Not used in adjustable configuration. Shutdown (Input): Active-low input enables regulator. (Low = enable; high = shutdown.) Error Flag (Output): Open collector (active-low) output. Active state indicates an output (VOUT) undervoltage condition. (Low = error, floating = normal.) Divider Tap (Output): Resistive voltage divider tap. With 5V applied to SNS, VTAP is approximately 1.23V. Connect to FB for 5V operation. Not used in adjustable configuration. Feedback (Input): Error amplifier input. Compared to internal 1.23V reference. Connect to external voltage divider for adjustable operation or internal voltage divider (TAP) for 5V operation (see SNS, TAP).
3 5
SHDN ERR
6
TAP
7
FB
MIC2954
2
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MIC2954
Micrel
Absolute Maximum Ratings (Note 1)
Input Voltage (VIN) ........................................ -20V to +60V Feedback Voltage (VFB), Note 14,15 ........... -1.5V to +26V Shutdown Input Voltage (VSHDN) ................. -0.3V to +30V Error Output Voltage (VERR) ........................ -0.3V to +30V Power Dissipation (PD), Note 4 ............... Internally Limited Storage Temperature (TS) ....................... -65C to +150C Lead Temperature (soldering, 5 sec.) ....................... 260C ESD, Note 3
Operating Ratings (Note 2)
Input Voltage (VIN) ....................................... +2.0V to +30V Junction Temperature (TJ) ....................... -40C to +125C Package Thermal Temperature (JC, JA) ................ Note 5
Electrical Characteristics
MIC2954-07/08: VFB = VTAP; VSNS = VOUT; VSHDN 0.6V. All versions: VIN = 6V; IL = 1mA; CL = 2.2F; TJ = 25C, bold values indicate -40C TJ +125C; Note 8; unless noted. Symbol VOUT Parameter Output Voltage Conditions MIC2954-02/-07 (0.5%) MIC2954-02/-07 (0.5%), 1mA IL 250mA MIC2954-03/-08 (1%) MIC2954-03/-08 (1%), 1mA IL 250mA VOUT/T VOUT/VOUT Output Voltage Temperature Coefficient, Note 6 Line Regulation, Note 7 MIC2954-02/-07 (0.5%) MIC2954-03/-08 (1%) MIC2954-02/-07 (0.5%), VIN = 6V to 26V MIC2954-03/-08 (1%), VIN = 6V to 26V VOUT/VOUT Load Regulation, Note 8 MIC2954-02/-07 (0.5%), IL = 1 to 250mA, MIC2954-03/-08 (1%), IL = 1 to 250mA, VIN - VOUT Dropout Voltage, Note 9 IL = 1mA IL = 50mA IL = 100mA IL = 250mA IGND Ground Pin Current, Note 10 IL = 1mA IL = 50mA IL = 100mA IL = 250mA IGND(DO) ILIMIT Ground Pin Current at Dropout, Note 10 Current Limit, Note 11 VIN = 4.5V VOUT = 0V Min 4.975 4.940 4.930 4.950 4.900 4.880 Typ 5.000 5.000 5.000 5.000 20 20 0.03 0.03 0.04 0.04 60 220 250 375 140 0.5 1.7 5 180 Max 5.025 5.060 5.070 5.050 5.100 5.120 100 150 0.10 0.20 0.20 0.40 0.16 0.20 0.20 0.30 100 150 250 420 300 450 450 600 200 300 1 2 2.5 3.5 9 12 300 750 800 Units V V V V V V ppm/C ppm/C %/V %/V %/V %/V %/V %/V %/V %/V mV mV mV mV mV mV mV mV A A mA mA mA mA mA mA A mA mA
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MIC2954
MIC2954
Symbol VOUT/PD en Parameter Thermal Regulation, Note 12 Output Noise Voltage (10Hz to 100kHz) Reference Voltage IL = 100mA, CL = 2.2F IL = 100mA, CL = 33F MIC2954-02/-07 (0.5%) MIC2954-03/-08 (1%) Reference Voltage MIC2954-02/-07 (0.5%), Note 13 MIC2954-03/-08 (1%), Note 13 Feedback Pin Bias Current Reference Voltage Temperature Coefficient, Note 12 Feedback Pin Bias Current Temperature Coefficient Error Comparator Output Leakage Current Output Low Voltage Upper Threshold Voltage Lower Threshold Voltage Hysteresis Shutdown Input Input Logic Voltage low (on) high (off) Shutdown Pin Input Current VSHDN = 2.4V VSHDN = 30V Regular Output Current in Shutdown
Note 1. Note 2. Note 3. Note 4. Note 5.
Micrel
Conditions Min Typ 0.05 400 260 1.220 1.200 1.210 1.200 1.190 1.185 20 MIC2954-02/-07 (0.5%) MIC2954-03/-08 (1%) 20 50 0.1 40 1.235 1.235 1.250 1.260 1.260 1.270 1.270 1.285 40 60 Max 0.2 Units %/W V(rms) V(rms) V V V V V V nA nA ppm/C ppm/C nA/C
VOH = 30V VIN = 4.5V, IOL = 400A Note 14 Note 14 Note 14
0.01 150 60 75 15
1.00 2.00 250 400 40 25 95 140
A A mV mV mV mV mV mV mV
1.3 2.0 30 450 3
0.7
V V A A A A A A
50 100 600 750 10 20
Note 15
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. PD(max) = (TJ(max) - TA) / JC. Exceeding TJ(max) will cause thermal shutdown. Thermal resistance (JC) of the TO-220 package is 2.5C/W, and 15C/W for the SOT-223. Thermal resistance (JC) of the TO-92 package is 180C/W with 0.4" leads and 160C/W with 0.25" leads. Thermal resistance (JA) of the SOP-8 is 160C/W mounted on a printed circuit board (See "Application Information: Thermal Calculation"). Output voltage temperature coefficient is defined as the worst case voltage change divide by the total temperature range. Line regulation for the MIC2954 is tested at 125C for IL = 1mA. For IL = 100A and TJ = 125C, line regulation is guaranteed by design to 0.2%. See "Typical Characteristics" for line regulation versus temperature and load current. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Changes in output voltage due to heating effects are covered by the thermal regulation specification. Dropout Voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured at 1V differential. At very low values of programmed output voltage, the minimum input supply voltage of 2 V (2.3V over temperature) must be taken into account.
Note 6. Note 7. Note 8. Note 9.
Note 10. Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current plus the ground pin current.
MIC2954
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MIC2954
Micrel
Note 11. The MIC2954 features fold-back current limiting. The short circuit (VOUT = 0V) current limit is less than the maximum current with normal output voltage. Note 12. Thermal regulation is defined as the change in output voltage at a time t after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a 200mA load pulse at VIN = 20V (a 4W pulse) for t = 10ms. Note 13. VREF VOUT (VIN - 1V), 2.3V VIN 30V, 100 A < IL 250 mA, TJ TJ(max). Note 14. Comparator thresholds are expressed in terms of a voltage differential at the FB pin below the nominal reference voltage measured at 6V input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = VOUT /VREF = (R1 + R2)/R2. For example, at a programmed output voltage of 5V, the error output is guaranteed to go low when the output drops by 95mV x 5V/1.235V = 384mV. Thresholds remain constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed. Note 15. VSHDN 2V, VIN 30 V,VOUT = 0, with the FB pin connected to TAP. Note 16. When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to ground. Note 17. Maximum positive supply voltage of 60V must be of limited duration (<10ms) and duty cycle (<1%). The maximum continuous supply voltage is 30V.
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MIC2954
MIC2954
Micrel
Typical Characteristics
GROUND PIN CURRENT (A)
180 160 140 120 100 80 60 40 20 0 0 1 2 3 4 5 6 7 8 I L = 1mA
Ground Pin Current
GROUND PIN CURRENT (A)
400
Ground Pin Current
GROUND PIN CURRENT (mA)
100
Ground Pin Current vs Load
300
10
200 I L = 1mA 100
1
0.1 0.01 0.1
0 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C)
1
10
100
1000
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
GROUND PIN CURRENT (mA)
20 18 16 14 12 10 8 6 4 2 0
Ground Pin Current
GROUND PIN CURRENT (mA)
25
Ground Pin Current
NOISE VOLTAGE (Vrms)
500 400 300 200 100
Output Noise Voltage
CL = 2.2 F
20 15 10 5
I L = 250mA
I L = 250 mA
CL = 33 F
I L = 100 mA
V IN =6V V OUT =5V 1 10 100 1000
0
1
2
3
4
5
6
7
8
0 -75 -50 -25 0 25 50 75 100125 150 JUNCTION TEMPERATURE (C)
0 0.1
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
100
Ripple Rejection
RIPPLE REJECTION (dB)
90 80 70 60 50 40 30 20
Ripple Rejection
I L = 100 mA
100
Ripple Rejection
RIPPLE REJECTION (dB)
80 70 60 50 40 30 V IN =6V V OUT =5V CL=2.2F 0.1 1 10 I L =1 mA
RIPPLE REJECTION (dB)
90
90 80 70 60 50 40 30 V IN =6V V OUT =5V CL=2.2F 0.1 1 I L = 100 A IL=0
I L = 250mA V IN =6V V OUT =5V CL=10F 0.1 1 10 100 1000
20 0.01
I L =10mA 100 1000
10 0.01
20 0.01
10
100
1000
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (kHz)
Line Transient Response
INPUT OUTPUT VOLTAGE VOLTAGE CHANGE (mV)
400 0 -400 8V 6V 0 0.2 0.4 0.6 0.8 1 CL=2.2F I L=10mA V OUT =5V
Line Transient Response
INPUT OUTPUT VOLTAGE VOLTAGE CHANGE (mV) OUTPUT IMPEDANCE ( )
80 40 0 -40 8V 6V 0 1 2 3 4 5 CL=33F I L=10mA V OUT =5V
100 10 1
Output Impedance
I L=100A V IN =6V V OUT =5V CL=10F
0.1
I L=10A I L=250mA
0.01 0.01
0.1
1
10
100 1000
TIME (mS)
TIME (mS)
FREQUENCY (kHz)
MIC2954
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August 1999
MIC2954
Micrel
OUTPUT VOLTAGE CHANGE (mV)
0 -400 -800 250mA 100A 0 10
CL=2.2F
0 -100 -200 250mA 100A 0
CL=33F
OUTPUT VOLTAGE (V)
400
VIN =6V VOUT =5V
OUTPUT VOLTAGE CHANGE (mV)
800
Load Transient Response
200 100
Load Transient Response
VIN =6V VOUT =5V 6 5 4 3
Dropout Characteristics
I L=100A I L=250mA
2 1 0
LOAD CURRENT
20
30
40
LOAD CURRENT
10
20
30
40
50
60
0
1
2
3
4
5
6
TIME (mS)
TIME (mS)
INPUT VOLTAGE (VOLTS)
10 Enable Transient OUTPUT VOLTAGE (mV) OUTPUT VOLTAGE (V) 8 6 4 2 0 2 0 0 1 2 3 4 5 CL=33F I L=10mA VIN =14V VOUT =5V 6
CL=2.2F
Enable Transient
CL=2.2F
700 650 CURRENT (mA) 600 550 500 450 400 350
Short Circuit and Maximum Current vs. Temperature
VOUT = VNOMINAL - 0.5V VOUT = 3.3V
4 2 0 2 0 0 1 2 3 4 5 CL=33F I L=10mA VIN =6V VOUT =5V
3 SAMPLES (HI/AVG/LO)
SHUTDOWN VOLTAGE (V)
SHUTDOWN VOLTAGE (V)
VOUT = 0V 0 30 60 90 120 150
300 -60 -30
TIME (mS)
TIME (mS)
TEMPERATURE (C)
POWER OUTPUT VOLTAGE DISSIPATION (W) CHANGE (V)
Thermal Regulation
15 10 5 0 -5 4 2 0
0
10
20
30
40
TIME (mS)
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MIC2954
MIC2954
Micrel
Block Diagrams
Unregulated DC Supply
IN OUT Error Amp. 182k 62k 1.23V REF. MIC2954-02/-03 2.2F GND 5V/250mA Output
MIC2954-02 and MIC2954-03
Unregulated DC Supply
FB
IN OUT Error Amp. 182k SNS TAP 330k 5V/250mA Output
SHDN
TTL/CMOS Control Logic Input
60mV
60k Error Detection Comparator
ERR
TTL/CMOS Compatible Error Output
1.23V REF. MIC2954-07/-08
GND
MIC2954-07 and MIC2954-08
MIC2954
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August 1999
MIC2954
Micrel
Programming the Output Voltage (MIC2954-07/-08) The MIC2954-07/-08 may be pin-strapped for 5V using its internal voltage divider by tying pin 1 (OUT) to pin 2 (SNS) and pin 7 (FB) to pin 6 (TAP). Alternatively, it may be programmed for any output voltage between its 1.235V reference and its 30V maximum rating. An external pair of resistors is required, as shown in Figure 3. The complete equation for the output voltage is R1 VOUT = VREF 1 + + I R1 R2 FB where: VREF = nominal 1.235V reference voltage IFB = nominal FB pin bias current (-20nA) The minimum recommended load current of 1A forces an upper limit of 1.2M on the value of R2, if the regulator must work with no load (a condition often found in CMOS in standby), IFB will produce a 2% typical error in VOUT which may be eliminated at room temperature by trimming R1. For better accuracy, choosing R2 = 100k reduces this error to 0.17% while increasing the resistor program current to 12A. Since the MIC2954-07/-08 typically draws 60A at no load with pin 2 (SNS) open-circuited, this is a negligible addition. Reducing Output Noise In reference applications it may be advantageous to reduce the ac noise present at the output. One method is to reduce the regulator bandwidth by increasing the size of the output capacitor. This is relatively inefficient, as increasing the capacitor from 1F to 220F only decreases the noise from 430V to 160VRMS for a 100kHz bandwidth at 5V output. Noise can be reduced fourfold by a bypass capacitor across R1, since it reduces the high frequency gain from 4 to unity. Pick: CBYPASS 1 2R1x 200Hz
Applications Information
External Capacitors A 2.2F (or greater) capacitor is required between the MIC2954 output and ground to prevent oscillations due to instability. Most types of tantalum or aluminum electrolytics will be adequate; film types will work, but are costly and therefore not recommended. Many aluminum electrolytics have electrolytes that freeze at about -30C, so solid tantalums are recommended for operation below -25C. The important parameters of the capacitor are an effective series resistance of about 5 or less and a resonant frequency above 500kHz. The value of this capacitor may be increased without limit. At lower values of output current, less output capacitance is required for output stability. The capacitor can be reduced to 0.5F for current below 10mA or 0.15F for currents below 1mA. Adjusting the MIC2954-07/-08 to voltages below 5V runs the error amplifier at lower gains so that more output capacitance is needed. For the worst-case situation of a 250mA load at 1.23V output (output shorted to feedback) a 5F (or greater) capacitor should be used. The MIC2954 will remain in regulation with a minimum load of 1mA. When setting the output voltage of the MIC2954-07/ -08 version with external resistors, the current through these resistors may be included as a portion of the minimum load. A 0.1F capacitor should be placed from the MIC2954 input to ground if there is more than 10 inches of wire between the input and the ac filter capacitor or if a battery is used as the input. Error Detection Comparator Output (MIC2954-07/-08) A logic-low output will be produced by the comparator whenever the MIC2954-07/-08 output falls out of regulation by more than approximately 5%. This figure is the comparator's built-in offset of about 60mV divided by the 1.235V reference voltage. (Refer to the block diagram on page 1). This trip level remains "5% below normal" regardless of the programmed output voltage of the MIC2954-07/-08. For example, the error flag trip level is typically 4.75V for a 5V output or 11.4V for a 12V output. The out of regulation condition may be due either to low input voltage, current limiting, or thermal limiting. Figure 1 is a timing diagram depicting the ERR signal and the regulated output voltage as the MIC2954-07/-08 input is ramped up and down. The ERR signal becomes valid (low) at about 1.3V input. It goes high at about 5V input (the input voltage at which VOUT = 4.75). Since the MIC2954-07/-08's dropout voltage is load-dependent (see curve in "Typical Characteristics"), the input voltage trip point (about 5V) will vary with the load current. The output voltage trip point (approximately 4.75V) does not vary with load. The error comparator has an open-collector output which requires an external pull-up resistor. Depending on system requirements, this resistor may be returned to the 5V output or some other supply voltage. In determining a value for this resistor, note that while the output is rated to sink 400A, this sink current adds to battery drain in a low battery condition. Suggested values range from 100k to 1M. The resistor is not required if this output is unused. August 1999 9
4.75V Output Voltage * Not Valid * Not Valid
ERR
Input Voltage 1.3V
5V
*See Application Information
Figure 1. Error Output Timing
MIC2954
MIC2954
or about 0.01F. When doing this, the output capacitor must be increased to 3.3F to maintain stability. These changes reduce the output noise from 430V to 100V rms for a 100kHz bandwidth at 5V output. With the bypass capacitor added, noise no longer scales with output voltage so that improvements are more dramatic at higher output voltages. Automotive Applications The MIC2954 is ideally suited for automotive applications for a variety of reasons. It will operate over a wide range of input voltages with very low dropout voltages (40mV at light loads), and very low quiescent currents (75A typical). These features are necessary for use in battery powered systems, such as automobiles. It is a "bulletproof" device with the ability to survive both reverse battery (negative transients up to 20V below ground), and load dump (positive transients up to 60V) conditions. A wide operating temperature range with low temperature coefficients is yet another reason to use these versatile regulators in automotive designs.
Micrel
Multilayer boards having a ground plane, wide traces near the pads, and large supply bus lines provide better thermal conductivity. Our calculations will use the "worst case" value of 160C/W, which assumes no ground plane, minimum trace widths, and a FR4 material board. Pad Layout (minimum recommended geometry)
50 mil
245 mil
150 mil
Thermal Calculations
Layout Considerations The MIC2954-07BM/-08BM (8-pin surface-mount package) has the following thermal characteristics when mounted on a single layer copper-clad printed circuit board. PC Board Dielectric Material FR4 Ceramic JA 160C/W 120C/W
30 mil 50 mil
Nominal Power Dissipation and Die Temperature The MIC2954-07BM/-08BM at a 55C ambient temperature will operate reliably at up to 440mW power dissipation when mounted in the "worst case" manner described above. This power level is equivalent to a die temperature of 125C, the recommended maximum temperature for nonmilitary grade silicon integrated circuits.
Schematic Diagram
IN FEEDBACK
R18 20k
Q15A Q15B
Q24 Q26 Q25 Q9 Q3
OUT
R11 18 k
Q4
Q7 Q5 Q8
SENSE Q14
Q6 Q1 10
R1 20 k
C1 20 pF
R11 20.6 k
Q2
Q20
Q16
Q17
R17 12 k
R27 182 k
5V TAP
R28 60 k
Q22 Q21
C2 40 pF
Q42
R8 31.4 k
R10 150 k
Q23
R2 50 k
R5 180 k
Q13
R6 140 k
Q12
R9 27.8 k
R15 100 k
Q40 Q41
R12 110 k
Q11
R13 100 k
R14 350 k
Q29
R16 30 k
R17 10
R30 30 k
Q18
Q19 Q28
R3 50 k
R4 13 k
R21 8
50 k
Q37 Q36
Q30 Q31
SHDN
R22 150 k
R24 50 k
R23 60 k
10 k
ERROR Q38
R26 60 k
Q34
R25 2.8 k
DENOTES CONNECTION ON MIC2954-02Bx/-03Bx ONLY
Q39
GND
MIC2954
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August 1999
MIC2954
Micrel
Package Information
0.151 D 0.005 (3.84 D 0.13) 0.410 0.010 (10.41 0.25) 0.108 0.005 (2.74 0.13) 0.176 0.005 (4.47 0.13) 0.050 0.005 (1.27 0.13)
0.590 0.005 (14.99 0.13)
7
0.818 0.005 (20.78 0.13)
0.356 0.005 (9.04 0.13)
7
3
1.140 0.010 (28.96 0.25)
0.050 0.003 (1.27 .08) 0.100 0.005 (2.54 0.13)
0.030 0.003 (0.76 0.08)
0.018 0.008 (0.46 0.020)
0.100 0.020 (2.54 0.51) DIMENSIONS: INCH (MM)
TO-220 (T)
0.090 (2.286) Radius, typ. 2 1 3 0.145 (3.683) 0.135 (3.429) 0.055 (1.397) 0.045 (1.143)
10 typ.
BOTTOM VIEW
0.085 (2.159) Diam. 0.185 (4.699) 0.175 (4.445) 5 typ. 0.185 (4.699) 0.175 (4.445)
0.090 (2.286) typ.
Seating Plane 0.025 (0.635) Max Uncontrolled Lead Diameter 0.500 (12.70) Min.
5 typ.
0.016 (0.406) 0.014 (0.356) 0.055 (1.397) 0.045 (1.143) 0.105 (2.667) 0.095 (2.413) 0.0155 (0.3937) 0.0145 (0.3683)
TO-92 (Z) August 1999 11 MIC2954
MIC2954
Micrel
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)
SOP-8 (M)
3.15 (0.124) 2.90 (0.114)
C L
C L
3.71 (0.146) 7.49 (0.295) 3.30 (0.130) 6.71 (0.264)
2.41 (0.095) 2.21 (0.087) 4.7 (0.185) 4.5 (0.177) 6.70 (0.264) 6.30 (0.248)
1.04 (0.041) 0.85 (0.033) DIMENSIONS: MM (INCH) 1.70 (0.067) 16 1.52 (0.060) 10 10 MAX
0.10 (0.004) 0.02 (0.0008)
0.038 (0.015) 0.25 (0.010)
0.84 (0.033) 0.64 (0.025) 0.91 (0.036) MIN
SOT-223 (S)
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) 1999 Micrel Incorporated
MIC2954
12
August 1999

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