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MIC2950*/2951
150mA Low-Dropout Voltage Regulator
General Description
Features
The MIC2950 and MIC2951 are “bulletproof” micropower
voltage regulators with very low dropout voltage (typically
40mV at light loads and 250mV at 100mA), and very low
quiescent current. Like their predecessors, the LP2950 and
LP2951, the quiescent current of the MIC2950/MIC2951
increases only slightly in dropout, thus pro-longing battery
life. The MIC2950/MIC2951 are pin for pin compatible with
the LP2950/LP2951, but offer lower dropout, lower
quiescent current, reverse battery, and automotive load
dump protection.
The key additional features and protection offered include
higher output current (150mA), positive transient protection
for up to 60V (load dump), and the ability to survive an
unregulated input voltage transient of –20V below ground
(reverse battery).
The plastic DIP and SOIC versions offer additional system
functions such as programmable output voltage and logic
controlled shutdown. The 3-pin TO-92 MIC2950 is pin-
compatible with the older 5V regulators.
These system functions also include an error ag 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 also
available which enables the regulator to be switched on and
off. This part may also be pin-strapped for a 5 V output, or
programmed from 1.24 V to 29 V with the use of two
external resistors.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
High accuracy 3.3, 4.85, or 5V, guaranteed 150mA
output
Extremely low quiescent current
Low-dropout voltage
Extremely tight load and line regulation
Very low temperature coefficient
Use as regulator or reference
Needs only 1.5µF for stability
Current and thermal limiting
Unregulated DC input can withstand –20V reverse
battery and +60V positive transients
MIC2951 Version Only
Error flag warns of output dropout
Logic-controlled electronic shutdown
Output programmable from 1.24 to 29V
Applications
Automotive electronics
Voltage reference
Avionics
Cellular telephones
Battery powered equipment
SMPS post-regulator
High efficiency linear power supplies
___________________________________________________________________________________________________________
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
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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 specication
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
coefcient 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
MIC2950-05BZ*
MIC2950-06BZ*
MIC2951-02BM
MIC2951-03BM
MIC2951-02BN**
MIC2951-03BN
MIC2951-03BMM
MIC2951-3.3BM
MIC2950-05YZ*/***
MIC2950-06YZ*/***
MIC2951-02YM***
MIC2951-03YM***
MIC2951-03YN***
MIC2951-03YMM***
MIC2951-3.3YM***
Voltage
5.0V
5.0V
5.0V
5.0V
5.0V
5.0V
5.0V
3.3V
5.0V
5.0V
5.0V
5.0V
5.0V
5.0V
3.3V
Accuracy
0.5%
1.0%
0.5%
1.0%
0.5%
1.0%
1.0%
1.0%
0.5%
1.0%
0.5%
1.0%
1.0%
1.0%
1.0%
Junction
Temperature Range
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
Package
3-Pin TO-92
3-Pin TO-92
8-Pin SOIC
8-Pin SOIC
8-Pin Plastic DIP
8-Pin Plastic DIP
8-Pin MSOP
8-Pin SOIC
3-Pin TO-92
3-Pin TO-92
8-Pin SOIC
8-Pin SOIC
8-Pin Plastic DIP
8-Pin MSOP
8-Pin SOIC
Lead Finish
Standard
Standard
Standard
Standard
Standard
Standard
Standard
Standard
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
Pb-Free
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.
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Micrel, Inc.
Pin Configuration
MIC2950/2951
TO-92 (Z)
(Bottom View)
DIP (N), SOIC (M), MM8® (MM)
(Top View)
Pin Description
Pin No.
MIC2950
3
Pin No.
MIC2951
1
2
3
24
5
6
7
18
Pin Name
OUT
SNS
SHDN
GND
ERR
TAP
FB
IN
Pin Function
Regulated Output.
Sense (Input): Output-voltage sensing end of internal voltage divider for xed 5V
operation. Not used in adjustable conguration.
Shutdown/Enable (Input): TTL compatible input. High = shutdown, low or open
= enable.
Ground.
Error Flag (Output): Active low, open-collector output (low = error, oating =
normal).
3.3V/4.85/5V Tap: Output of internal voltage divider when the regulator is
congured for xed operation. Not used in adjustable conguration.
Feedback (Input): 1.235V feedback from internal voltage divider’s TAP (for xed
operation) or external resistor network (adjustable conguration).
Unregulated Supply Input.
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Micrel, Inc.
MIC2950/2951
Absolute Maximum Ratings(1)
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)
Operating Ratings(2)
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
Min Typ Max
Output Voltage
TJ = 25°C
MIC295x-02/-05 (±0.5%)
MIC295x-03/06 (±1%)
4.975 5.000
4.950 5.000
5.025
5.050
MIC2951-3.3 (±1%)
3.267 3.300 3.333
MIC2951-4.8 (±1%)
4.802 4.850 4.899
Output Voltage
–25°C TJ +85°C
MIC295x-02/-05 (±0.5%)
MIC295x-03/-06 (±1%)
4.950
4.925
5.050
5.075
MIC2951-3.3 (±1%)
3.251
3.350
MIC2951-4.8 (±1%)
4.777
4.872
Output Voltage
Over Full Temperature Range
–40°C to +125°C
MIC295x-02/-05 (±0.5%)
MIC295x-03/06 (±1%)
MIC2951-3.3 (±1%)
4.940
4.900
3.234
5.060
5.100
3.366
MIC2951-4.8 (±1%)
4.753
4.947
Output Voltage
Over Load Variation
Output Voltage
Temperature Coefficient
MIC295x-02/-05 (±0.5%), 100µA IL 150mA, TJ TJ(max)
MIC295x-03/-06 (±1%), 100µA IL 150mA, TJ TJ(max)
MIC2951-3.3 (±1%), 100µA IL 150mA, TJ TJ(max)
MIC2951-4.8 (±1%), 100µA IL 150mA, TJ TJ(max)
MIC295x-02/-05 (±0.5%), Note 9
MIC295x-03/-06 (±1%), Note 9
4.930
4.880
3.221
4.733
20
50
5.070
5.120
3.379
4.967
100
150
MIC2951-3.3 (±1%), Note 9
50 150
MIC2951-4.8 (±1%), Note 9
50 150
Line Regulation
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
Units
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
ppm/°C
ppm/°C
ppm/°C
ppm/°C
%
%
%
%
%
%
%
%
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Micrel, Inc.
MIC2950/2951
Parameter
Load Regulation
Dropout Voltage
Ground Current
Dropout Ground Current
Condition
MIC295x-02/-05 (±0.5%), 100µA IL 150mA, Note 10
MIC295x-03/-06 (±1%), 100µA IL 150mA, Note 10
MIC2951-3.3 (±1%), 100µA IL 150mA, Note 10
MIC2951-4.8 (±1%), 100µA IL 150mA, Note 10
MIC295x-02/-03/-05/-06, IL = 100µA, Note 12
MIC295x-02/-03/-05/-06, IL = 100mA, Note 12
MIC295x-02/-03/-05/-06, IL = 150mA, Note 12
MIC2951-3.3 (±1%), IL = 100µA, Note 12
MIC2951-3.3 (±1%), IL = 100mA, Note 12
MIC2951-3.3 (±1%), IL = 150mA, Note 12
MIC2951-4.8 (±1%), IL = 100µA, Note 12
MIC2951-4.8 (±1%), IL = 100mA, Note 12
MIC2951-4.8 (±1%), IL = 150mA, Note 12
MIC295x-02/-03/-05/-06, IL = 100µA
MIC295x-02/-03/-05/-06, IL = 100mA
MIC295x-02/-03/-05/-06, IL = 150mA
MIC2951-3.3 (±1%), IL = 100µA
MIC2951-3.3 (±1%), IL = 100mA
MIC2951-3.3 (±1%), IL = 150mA
MIC2951-4.8 (±1%), IL = 100µA
MIC2951-4.8 (±1%), IL = 100mA
MIC2951-4.8 (±1%), IL = 150mA
MIC295x-02/-03/-05/-06, VIN = 4.5V, IL = 100µA
MIC2951-3.3 (±1%), VIN = 3.0V, IL = 100µA
MIC2951-4.8 (±1%), VIN = 4.3V, IL = 100µA
Min Typ Max
0.04 0.10
0.20
0.10 0.20
0.30
0.10 0.20
0.30
0.10 0.20
0.30
40 80
140
250 300
300 450
600
40 80
150
250 350
320 450
600
40 80
140
250 300
320 450
600
120 180
300
1.7 2.5
3.5
46
8
100 180
300
1.7 2.5
46
10
120 180
300
1.7 2.5
3.5
46
8
280 350
400
150 350
400
280 350
400
Units
%
%
%
%
%
%
%
%
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
µA
µA
mA
mA
mA
mA
µA
µA
mA
mA
mA
µA
µA
mA
mA
mA
mA
µA
µA
µA
µA
µA
µA
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