Micrel MIC2951-3.3YM 150ma low-dropout voltage regulator Datasheet

MIC2950*/2951
150mA Low-Dropout Voltage Regulator
General Description
Features
The MIC2950 and MIC2951 are “bulletproof” micropower
• High accuracy 3.3, 4.85, or 5V, guaranteed 150mA
voltage regulators with very low dropout voltage (typically
output
40mV at light loads and 250mV at 100mA), and very low
• Extremely low quiescent current
quiescent current. Like their predecessors, the LP2950 and
• Low-dropout voltage
LP2951, the quiescent current of the MIC2950/MIC2951
• Extremely tight load and line regulation
increases only slightly in dropout, thus pro-longing battery
• Very low temperature coefficient
life. The MIC2950/MIC2951 are pin for pin compatible with
• Use as regulator or reference
the LP2950/LP2951, but offer lower dropout, lower
• Needs only 1.5µF for stability
quiescent current, reverse battery, and automotive load
dump protection.
• Current and thermal limiting
• Unregulated DC input can withstand –20V reverse
The key additional features and protection offered include
battery and +60V positive transients
higher output current (150mA), positive transient protection
for up to 60V (load dump), and the ability to survive an
MIC2951 Version Only
unregulated input voltage transient of –20V below ground
• Error flag warns of output dropout
(reverse battery).
• Logic-controlled electronic shutdown
The plastic DIP and SOIC versions offer additional system
• Output programmable from 1.24 to 29V
functions such as programmable output voltage and logic
controlled shutdown. The 3-pin TO-92 MIC2950 is pincompatible with the older 5V regulators.
Applications
These system functions also include an error flag output
• Automotive electronics
that warns of a low output voltage, which is often due to
• Voltage reference
failing batteries on the input. This may also be used as a
• Avionics
power-on reset. A logic-compatible shutdown input is also
available which enables the regulator to be switched on and
• Cellular telephones
off. This part may also be pin-strapped for a 5 V output, or
• Battery powered equipment
programmed from 1.24 V to 29 V with the use of two
• SMPS post-regulator
external resistors.
• High efficiency linear power supplies
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
___________________________________________________________________________________________________________
Block Diagram
* MIC2950 Discontinuance September 2007.
MM8 is a registered trademark of Micrel, 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
February 2010
M9999-021610
Micrel, Inc.
MIC2950/2951
The MIC2950 is available as either an -05 or -06 version.
The -05 and -06 versions are guaranteed for junction
temperatures from –40°C to +125°C; the -05 version has
a tighter output and reference voltage specification
range over temperature. The MIC2951 is available as an
-02 or -03 version.
The MIC2950 and MIC2951 have a tight initial tolerance
(0.5% typical), a very low output voltage temperature
coefficient which allows use as a low-power voltage
reference, and extremely good load and line regulation
(0.04% typical). This greatly reduces the error in the
overall circuit, and is the result of careful design
techniques and process control.
___________________________________________________________________________________________________________
Ordering Information
Part Number
Voltage
Accuracy
Junction
Temperature Range
Package
Lead Finish
MIC2950-05BZ*
5.0V
0.5%
–40° to +125°C
3-Pin TO-92
Standard
MIC2950-06BZ*
5.0V
1.0%
–40° to +125°C
3-Pin TO-92
Standard
MIC2951-02BM
5.0V
0.5%
–40° to +125°C
8-Pin SOIC
Standard
MIC2951-03BM
5.0V
1.0%
–40° to +125°C
8-Pin SOIC
Standard
MIC2951-02BN**
5.0V
0.5%
–40° to +125°C
8-Pin Plastic DIP
Standard
MIC2951-03BN
5.0V
1.0%
–40° to +125°C
8-Pin Plastic DIP
Standard
MIC2951-03BMM
5.0V
1.0%
–40° to +125°C
8-Pin MSOP
Standard
MIC2951-3.3BM
3.3V
1.0%
–40° to +125°C
8-Pin SOIC
Standard
MIC2950-05YZ*/***
5.0V
0.5%
–40° to +125°C
3-Pin TO-92
Pb-Free
MIC2950-06YZ*/***
5.0V
1.0%
–40° to +125°C
3-Pin TO-92
Pb-Free
MIC2951-02YM***
5.0V
0.5%
–40° to +125°C
8-Pin SOIC
Pb-Free
MIC2951-03YM***
5.0V
1.0%
–40° to +125°C
8-Pin SOIC
Pb-Free
MIC2951-03YN***
5.0V
1.0%
–40° to +125°C
8-Pin Plastic DIP
Pb-Free
MIC2951-03YMM***
5.0V
1.0%
–40° to +125°C
8-Pin MSOP
Pb-Free
MIC2951-3.3YM***
3.3V
1.0%
–40° to +125°C
8-Pin SOIC
Pb-Free
Note:
*
TO-92 Package discontinuance notification issued September 2007. End-of-life-buy offer thru December 31, 2007. Contact factory for
additional information.
** Contact factory for Pb-Free version.
*** Pb-Free RoHS compliant with ‘high-melting solder’ exemption.
February 2010
2
M9999-021610
Micrel, Inc.
MIC2950/2951
Pin Configuration
DIP (N), SOIC (M), MM8® (MM)
(Top View)
TO-92 (Z)
(Bottom View)
Pin Description
Pin No.
MIC2950
Pin No.
MIC2951
Pin Name
3
2
1
February 2010
Pin Function
1
OUT
Regulated Output.
2
SNS
Sense (Input): Output-voltage sensing end of internal voltage divider for fixed 5V
operation. Not used in adjustable configuration.
3
SHDN
Shutdown/Enable (Input): TTL compatible input. High = shutdown, low or open
= enable.
4
GND
Ground.
5
ERR
Error Flag (Output): Active low, open-collector output (low = error, floating =
normal).
6
TAP
3.3V/4.85/5V Tap: Output of internal voltage divider when the regulator is
configured for fixed operation. Not used in adjustable configuration.
7
FB
Feedback (Input): 1.235V feedback from internal voltage divider’s TAP (for fixed
operation) or external resistor network (adjustable configuration).
8
IN
Unregulated Supply Input.
3
M9999-021610
Micrel, Inc.
MIC2950/2951
Absolute Maximum Ratings(1)
Operating Ratings(2)
Input Supply Voltage (VIN) (5) .............................–20 to +60V
Feedback Input Voltage (VFB) (6, 7) ....................–1.5 to +26V
Shutdown Input Voltage (VSHDN) (6) ...................–0.3 to +30V
Power Dissipation (PD) (4) ..........................Internally Limited
Lead Temperature (soldering, 5 sec.)........................ 260°C
Storage Temperature ................................–65°C to +150°C
ESD(3)
Input Supply Voltage (VIN)................................+2.0 to +30V
Junction Temperature (TJ) (4)
MIC2950-05/MIC2950-06 ................... –40°C to +125°C
MIC2951-02/MIC2950-03 ................... –40°C to +125°C
Electrical Characteristics(1)
VIN = 6V; IL = 100µA; CL = 1µF; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; Note 8; unless noted.
Parameter
Condition
Output Voltage
TJ = 25°C
MIC295x-02/-05 (±0.5%)
4.975
MIC295x-03/06 (±1%)
4.950
MIC2951-3.3 (±1%)
3.267
3.300
MIC2951-4.8 (±1%)
4.802
4.850
MIC295x-02/-05 (±0.5%)
4.950
MIC295x-03/-06 (±1%)
4.925
5.075
V
MIC2951-3.3 (±1%)
3.251
3.350
V
Output Voltage
–25°C ≤ TJ ≤ +85°C
Output Voltage
Over Full Temperature Range
–40°C to +125°C
Output Voltage
Over Load Variation
Output Voltage
Temperature Coefficient
Line Regulation
February 2010
Min
Typ
Max
Units
5.000
5.025
V
5.000
5.050
V
3.333
V
4.899
V
5.050
V
MIC2951-4.8 (±1%)
4.777
4.872
V
MIC295x-02/-05 (±0.5%)
4.940
5.060
V
MIC295x-03/06 (±1%)
4.900
5.100
V
MIC2951-3.3 (±1%)
3.234
3.366
V
MIC2951-4.8 (±1%)
4.753
4.947
V
MIC295x-02/-05 (±0.5%), 100µA ≤ IL ≤ 150mA, TJ ≤ TJ(max)
4.930
5.070
V
MIC295x-03/-06 (±1%), 100µA ≤ IL ≤ 150mA, TJ ≤ TJ(max)
4.880
5.120
V
MIC2951-3.3 (±1%), 100µA ≤ IL ≤ 150mA, TJ ≤ TJ(max)
3.221
3.379
V
MIC2951-4.8 (±1%), 100µA ≤ IL ≤ 150mA, TJ ≤ TJ(max)
4.733
4.967
V
100
ppm/°C
MIC295x-02/-05 (±0.5%), Note 9
20
MIC295x-03/-06 (±1%), Note 9
50
150
ppm/°C
MIC2951-3.3 (±1%), Note 9
50
150
ppm/°C
MIC2951-4.8 (±1%), Note 9
50
150
ppm/°C
MIC295x-02/-05 (±0.5%), Notes 10, 11
0.03
0.10
0.20
%
%
MIC295x-03/-06 (±1%), Notes 10, 11
0.04
0.20
0.40
%
%
MIC2951-3.3 (±1%), Notes 10, 11
0.04
0.20
0.40
%
%
MIC2951-4.8 (±1%), Notes 10, 11
0.04
0.20
0.40
%
%
4
M9999-021610
Micrel, Inc.
MIC2950/2951
Parameter
Condition
Typ
Max
Units
Load Regulation
MIC295x-02/-05 (±0.5%), 100µA ≤ IL ≤ 150mA, Note 10
0.04
0.10
0.20
%
%
MIC295x-03/-06 (±1%), 100µA ≤ IL ≤ 150mA, Note 10
0.10
0.20
0.30
%
%
MIC2951-3.3 (±1%), 100µA ≤ IL ≤ 150mA, Note 10
0.10
0.20
0.30
%
%
MIC2951-4.8 (±1%), 100µA ≤ IL ≤ 150mA, Note 10
0.10
0.20
0.30
%
%
MIC295x-02/-03/-05/-06, IL = 100µA, Note 12
40
80
140
mV
mV
MIC295x-02/-03/-05/-06, IL = 100mA, Note 12
Dropout Voltage
Ground Current
Dropout Ground Current
February 2010
Min
250
300
mV
MIC295x-02/-03/-05/-06, IL = 150mA, Note 12
300
450
600
mV
mV
MIC2951-3.3 (±1%), IL = 100µA, Note 12
40
80
150
mV
mV
MIC2951-3.3 (±1%), IL = 100mA, Note 12
250
350
mV
MIC2951-3.3 (±1%), IL = 150mA, Note 12
320
450
600
mV
mV
MIC2951-4.8 (±1%), IL = 100µA, Note 12
40
80
140
mV
mV
MIC2951-4.8 (±1%), IL = 100mA, Note 12
250
300
mV
MIC2951-4.8 (±1%), IL = 150mA, Note 12
320
450
600
mV
mV
MIC295x-02/-03/-05/-06, IL = 100µA
120
180
300
µA
µA
MIC295x-02/-03/-05/-06, IL = 100mA
1.7
2.5
3.5
mA
mA
MIC295x-02/-03/-05/-06, IL = 150mA
4
6
8
mA
mA
MIC2951-3.3 (±1%), IL = 100µA
100
180
300
µA
µA
MIC2951-3.3 (±1%), IL = 100mA
1.7
2.5
mA
MIC2951-3.3 (±1%), IL = 150mA
4
6
10
mA
mA
MIC2951-4.8 (±1%), IL = 100µA
120
180
300
µA
µA
MIC2951-4.8 (±1%), IL = 100mA
1.7
2.5
3.5
mA
mA
MIC2951-4.8 (±1%), IL = 150mA
4
6
8
mA
mA
MIC295x-02/-03/-05/-06, VIN = 4.5V, IL = 100µA
280
350
400
µA
µA
MIC2951-3.3 (±1%), VIN = 3.0V, IL = 100µA
150
350
400
µA
µA
MIC2951-4.8 (±1%), VIN = 4.3V, IL = 100µA
280
350
400
µA
µA
5
M9999-021610
Micrel, Inc.
MIC2950/2951
Parameter
Condition
Typ
Max
Units
Current Limit
VOUT = 0V
300
400
450
mA
mA
Thermal Regulation
Note 13
0.05
0.20
Output Noise
10Hz to 100kHz, CL = 1.5µF
430
µVRMS
10Hz to 100kHz, CL = 200µF
160
µVRMS
10Hz to 100kHz, CL = 3.3µF,
0.01µF bypass Feedback to Output
100
µVRMS
Reference Voltage
Reference Voltage
Min
MIC295x-02/-05 (±0.5%)
1.220
1.200
1.235
1.250
1.260
V
V
MIC295x-03/06 (±1%)
1.210
1.200
1.235
1.260
1.270
V
V
MIC2951-3.3 (±1%)
1.210
1.200
1.235
1.260
1.270
V
V
MIC2951-4.8 (±1%)
1.210
1.200
1.235
1.260
1.270
V
V
MIC295x-02/-05 (±0.5%), Note 14
1.190
1.270
V
MIC295x-03/-06 (±1%), Note 14
1.185
1.285
V
MIC2951-3.3 (±1%), Note 14
1.185
1.285
V
MIC2951-4.8 (±1%), Note 14
1.185
1.285
V
40
60
nA
nA
Feedback Bias Current
Reference Voltage
Temperature Coefficient
%/W
20
MIC295x-02/05 (±0.5%), Note 9
20
ppm/°C
MIC295x-03/06 (±1%), Note 9
50
ppm/°C
MIC2951-3.3 (±1%), Note 9
50
ppm/°C
50
ppm/°C
0.1
nA/°C
MIC2951-4.8 (±1%), Note 9
Feedback Bias Current
Temperature Coefficient
Error Comparator (Flag)
Output Leakage Current
VOH = 30V
0.01
1.00
2.00
µA
µA
Error Comparator (Flag)
Output Low Voltage (Flag)
VIN = 4.5V, IOL = 200µA
150
250
400
mV
mV
Error Comparator (Flag)
Upper Threshold Voltage
Note 15
Error Comparator
Lower Threshold Voltage
Note 15
75
Error Comparator Hysteresis
Note 15
15
February 2010
40
25
6
mV
mV
60
95
140
mV
mV
mV
M9999-021610
Micrel, Inc.
MIC2950/2951
Parameter
Condition
Shutdown Input Logic Voltage
MIC295x-02/-05 (±0.5%)
Low
High
Min
Units
0.7
V
V
V
0.7
V
V
V
0.7
V
V
V
0.7
V
V
V
2.0
1.3
2.0
MIC2951-3.3 (±1%)
Low
High
1.3
2.0
MIC2951-4.8 (±1%)
Low
High
Regulator Output Current
in Shutdown
Max
1.3
MIC295x-03/-06 (±1%)
Low
High
Shutdown Input Current
Typ
1.3
2.0
VSHUTDOWN = 2.4V
30
50
100
µA
µA
VSHUTDOWN = 30V
450
600
750
µA
µA
3
10
20
µA
µA
Note 7
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 are recommended.
4.
The junction-to-ambient thermal resistance of the TO-92 package is 180°C/W with 0.4” leads and 160°C/W with 0.25” leads to a PC board. The
thermal resistance of the 8-pin DIP package is 105°C/W junction-to-ambient when soldered directly to a PC board. Junction-to-ambient thermal
resistance for the SOIC (M) package is 160°C/W. Junction-to-ambient thermal resistance for the MM8™ (MM) is 250°C/W.
5.
The maximum positive supply voltage of 60V must be of limited duration (≤100ms) and duty cycle (≤1%). The maximum continuous supply voltage
is 30V.
6.
When used in dual-supply systems where the output terminal sees loads returned to a negative supply, the output voltage should be diode-clamped
to ground.
7.
VSHDN ≥ 2V, VIN ≤ 30V, VOUT = 0, with the FB pin connected to TAP.
8.
Additional conditions for 8-pin devices are VFB = 5V, TAP and OUT connected to SNS (VOUT = 5V) and VSHDN ≤ 0.8V.
9.
Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
10. 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 in the specification for thermal regulation.
11. Line regulation for the MIC2951 is tested at 150°C for IL = 1mA. For IL = 100µA and TJ = 125°C, line regulation is guaranteed by design to 0.2%.
See Typical Performance Characteristics for line regulation versus temperature and load current.
12. Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value measured at 1V
differential. At very low values of programmed output voltage, the minimum input supply voltage of 2V (2.3V over temperature) must be taken into
account.
13. 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 50mA load pulse at VIN = 30V (1.25W pulse) for t = 10ms.
14. VREF ≤ VOUT ≤ (VIN – 1 V), 2.3V ≤ VIN ≤ 30V, 100µA < IL ≤ 150mA, TJ ≤ TJMAX.
15. Comparator thresholds are expressed in terms of a voltage differential at the FB terminal 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.
16. Specification for packaged product only.
February 2010
7
M9999-021610
Micrel, Inc.
MIC2950/2951
Typical Characteristics
February 2010
8
M9999-021610
Micrel, Inc.
MIC2950/2951
Typical Characteristics (continued)
February 2010
9
M9999-021610
Micrel, Inc.
MIC2950/2951
Typical Characteristics (continued)
February 2010
10
M9999-021610
Micrel, Inc.
MIC2950/2951
Application Information
Error Detection Comparator Output
A logic low output will be produced by the comparator
whenever the MIC2951 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
MIC2951. 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, thermal limiting, or overvolt-age
on input (over ≅ 40V).
Figure 1 is a timing diagram depicting the /ERROR signal
and the regulated output voltage as the MIC2951 input is
ramped up and down. The /ERROR signal becomes valid
(low) at about 1.3V input. It goes high at about 5V input
(the input voltage at which VOUT = 4.75—for 5.0V
applications). Since the MIC2951’s dropout voltage is
load-dependent (see curve in Typical Performance
Characteristics), the input voltage trip point (about 5V) will
vary with the load current. The output voltage trip point
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
output or some other supply voltage. In determining a
value for this resistor, note that while the output is rated to
sink 200µA, this sink current adds to battery drain in a low
battery condition. Suggested values range from 100k to
1MΩ. The resistor is not required if this output is unused.
Automotive Applications
The MIC2950/2951 are ideally suited for automotive
applications for a variety of reasons. They will operate
over a wide range of input voltages, have very low
dropout voltages (40mV at light loads), and very low
quiescent currents. These features are necessary for use
in battery powered systems, such as automobiles. They
are also “bulletproof” devices; 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
External Capacitors
A 1.5µF (or greater) capacitor is required between the
MIC2950/MIC2951 output and ground to prevent
oscillations due to instability. Most types of tantalum or
aluminum elec-trolytics will be adequate; film types will
work, but are costly and therefore not recommended.
Many aluminum electrolytics have electrolytes that freeze
at about –30°C, so solid tantalums are recomm-ended for
operation below –25°C. The important parameters of the
capacitor are an effective series resistance of about 5Ω 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 0.5µF for current below 10mA or 0.15µF for
currents below 1 mA. Using the 8-pin versions at voltages
below 5V runs the error amplifier at lower gains so that
more output capacitance is needed. For the worst-case
situation of a 150mA load at 1.23V output (Output shorted
to Feedback) a 5µF (or greater) capacitor should be used.
The MIC2950 will remain stable and in regulation with no
load in addition to the internal voltage divider, unlike many
other voltage regulators. This is especially important in
CMOS RAM keep-alive applications. When setting the
output voltage of the MIC2951 version with external
resistors, a minimum load of 1µA is recomm-ended.
A 0.1µF capacitor should be placed from the MIC2950/
MIC2951 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.
Stray capacitance to the MIC2951 Feedback terminal (pin
7) can cause instability. This may especially be a problem
when using high value external resistors to set the output
voltage. Adding a 100pF capacitor between Output and
Feedback and increasing the output capacitor to at least
3.3µF will remedy this.
February 2010
Programming the Output Voltage (MIC2951)
The MIC2951 may be pin-strapped for 5V (or 3.3V or
4.85V) using its internal voltage divider by tying Pin 1
(output) to Pin 2 (sense) and Pin 7 (feedback) to Pin 6 (5V
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 2.
The complete equation for the output voltage is:
⎧ R ⎫
VOUT = VREF × ⎨1 + 1 ⎬ + IFB R 1
⎩ R2 ⎭
where VREF is the nominal 1.235 reference voltage and IFB
is the feedback pin bias current, nominally –20nA. The
minimum recommended load current of 1µA forces an
upper limit of 1.2MΩ 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 12µA.
11
M9999-021610
Micrel, Inc.
MIC2950/2951
Reducing Output Noise
In some 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 the only method by which
noise can be reduced on the 3 lead MIC2950 and is
relatively inefficient, as increasing the capacitor from 1µF
to 220µF only decreases the noise from 430µV to 160µV
rms 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:
C BYPASS ≅
1
2πR 1 • 200Hz
Figure 1. ERROR Output Timing
or about 0.01µF. When doing this, the output capacitor
must be increased to 3.3µF to maintain stability. These
changes reduce the output noise from 430µV to
100µVrms for a100kHz 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.
Figure 2. Adjustable Regulator
February 2010
12
M9999-021610
Micrel, Inc.
MIC2950/2951
Typical Applications
5V Regulator with 2.5V Sleep Function
Wide Input Voltage Range Current Limiter
Low Drift Current Source
5V Current Limiter
February 2010
13
M9999-021610
Micrel, Inc.
MIC2950/2951
Typical Applications
Regulator with Early Warning and Auxiliary Output
February 2010
14
M9999-021610
Micrel, Inc.
MIC2950/2951
Typical Applications
Latch Off When Error Flag Occurs
Open Circuit Detector for 4mA to 20mA Current Loop
Regulator with State-of-Charge Indicator
February 2010
15
M9999-021610
Micrel, Inc.
MIC2950/2951
Typical Applications
Low Battery Disconnect
System Over Temperature Protection Circuit
February 2010
16
M9999-021610
Micrel, Inc.
MIC2950/2951
Schematic Diagram
February 2010
17
M9999-021610
Micrel, Inc.
MIC2950/2951
Package Information
8-Pin SOIC (M)
PIN 1
DIMENSIONS:
INCH (MM)
0.380 (9.65)
0.370 (9.40)
0.255 (6.48)
0.245 (6.22)
0.135 (3.43)
0.125 (3.18)
0.300 (7.62)
0.013 (0.330)
0.010 (0.254)
0.018 (0.57)
0.100 (2.54)
0.130 (3.30)
0.0375 (0.952)
0.380 (9.65)
0.320 (8.13)
8-Pin Plastic DIP (N)
February 2010
18
M9999-021610
Micrel, Inc.
MIC2950/2951
8-Pin MSOP (MM)
February 2010
19
M9999-021610
Micrel, Inc.
MIC2950/2951
0.090 (2.286) Radius, t yp.
2
3
1
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° t yp.
0.185 (4.699)
0.175 (4.445)
0.090 (2.286) typ.
5° typ.
Seat ing Plane
0.025 (0.635) Max
Uncont rolled
Lead Diamet er
0.500 (12.70) Min.
0.016 (0.406)
0.014 (0.356)
0.0155 (0.3937)
0.0145 (0.3683)
0.055 (1.397)
0.045 (1.143)
0.105 (2.667)
0.095 (2.413)
TO-92 (Z)
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.
© 1999 Micrel, Incorporated.
February 2010
20
M9999-021610