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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 pin-
compatible 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
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***
Note:
*
TO-92 Package discontinuance notification issued September 2007. End-of-life-buy offer thru December 31, 2007. Contact factory for
additional information.
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
** 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
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
2
4
5
6
7
1
8
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
fixed
5V
operation. Not used in adjustable configuration.
Shutdown/Enable (Input): TTL compatible input. High = shutdown, low or open
= enable.
Ground.
Error Flag (Output): Active low, open-collector output (low = error,
floating
=
normal).
3.3V/4.85/5V Tap: Output of internal voltage divider when the regulator is
configured for
fixed
operation. Not used in adjustable configuration.
Feedback (Input): 1.235V feedback from internal voltage divider’s TAP (for
fixed
operation) or external resistor network (adjustable configuration).
Unregulated Supply Input.
February 2010
3
M9999-021610
Micrel, Inc.
MIC2950/2951
Absolute Maximum Ratings
(1)
Input Supply Voltage (V
IN
)
(5)
.............................–20 to +60V
Feedback Input Voltage (V
FB
)
(6, 7)
....................–1.5 to +26V
Shutdown Input Voltage (V
SHDN
)
(6)
...................–0.3 to +30V
Power Dissipation (P
D
)
(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 (V
IN
)................................+2.0 to +30V
Junction Temperature (T
J
)
(4)
MIC2950-05/MIC2950-06 ................... –40°C to +125°C
MIC2951-02/MIC2950-03 ................... –40°C to +125°C
Electrical Characteristics
(1)
V
IN
= 6V; I
L
= 100µA; C
L
= 1µF; T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C;
Note 8;
unless noted.
Parameter
Output Voltage
T
J
= 25°C
Condition
MIC295x-02/-05 (±0.5%)
MIC295x-03/06 (±1%)
MIC2951-3.3 (±1%)
MIC2951-4.8 (±1%)
Output Voltage
–25°C
≤
T
J
≤
+85°C
MIC295x-02/-05 (±0.5%)
MIC295x-03/-06 (±1%)
MIC2951-3.3 (±1%)
MIC2951-4.8 (±1%)
Output Voltage
Over Full Temperature Range
–40°C to +125°C
MIC295x-02/-05 (±0.5%)
MIC295x-03/06 (±1%)
MIC2951-3.3 (±1%)
MIC2951-4.8 (±1%)
Output Voltage
Over Load Variation
MIC295x-02/-05 (±0.5%), 100µA
≤
I
L
≤
150mA, T
J
≤
T
J(max)
MIC295x-03/-06 (±1%), 100µA
≤
I
L
≤
150mA, T
J
≤
T
J(max)
MIC2951-3.3 (±1%), 100µA
≤
I
L
≤
150mA, T
J
≤
T
J(max)
MIC2951-4.8 (±1%), 100µA
≤
I
L
≤
150mA, T
J
≤
T
J(max)
Output Voltage
Temperature Coefficient
MIC295x-02/-05 (±0.5%),
Note 9
MIC295x-03/-06 (±1%),
Note 9
MIC2951-3.3 (±1%),
Note 9
MIC2951-4.8 (±1%),
Note 9
Line Regulation
MIC295x-02/-05 (±0.5%),
Notes 10, 11
MIC295x-03/-06 (±1%),
Notes 10, 11
MIC2951-3.3 (±1%),
Notes 10, 11
MIC2951-4.8 (±1%),
Notes 10, 11
Min
4.975
4.950
3.267
4.802
4.950
4.925
3.251
4.777
4.940
4.900
3.234
4.753
4.930
4.880
3.221
4.733
20
50
50
50
0.03
0.04
0.04
0.04
Typ
5.000
5.000
3.300
4.850
Max
5.025
5.050
3.333
4.899
5.050
5.075
3.350
4.872
5.060
5.100
3.366
4.947
5.070
5.120
3.379
4.967
100
150
150
150
0.10
0.20
0.20
0.40
0.20
0.40
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
%
%
%
%
%
%
%
%
February 2010
4
M9999-021610
模拟电子
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