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MIC2950/2951
Micrel
MIC2950/2951
150mA Low-Dropout Voltage Regulator
General Description
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 prolonging 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 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 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.
Features
• 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
• Error flag warns of output dropout (MIC2951)
• Logic-controlled electronic shutdown (MIC2951)
• Output programmable from 1.24V to 29V (MIC2951)
Applications
• Automotive Electronics
• Battery Powered Equipment
• Cellular Telephones
• SMPS Post-Regulator
• Voltage Reference
• Avionics
• High Efficiency Linear Power Supplies
Block Diagram
3
Unregulated
DC Supply FB
SHDN
TTL/CMOS
Control Logic
Input
60mV
1.23V
REF.
MIC2951-0x
IN
Error
Amp.
182k
60k
Error Detection
Comparator
OUT
SNS
TAP
ERR
GND
5V/150mA
Output
330k
TTL/CMOS
Compatible
Error Output
1.5µF
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MIC2950/2951
Micrel
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
MIC2950-05BZ
5.0V
MIC2950-06BZ
5.0V
MIC2951-02BM
5.0V
MIC2951-03BM
5.0V
MIC2951-02BN
5.0V
MIC2951-03BN
5.0V
MIC2951-03BMM
5.0V
MIC2951-3.3BM
3.3V
MIC2951-4.8BM
4.85V
* junction temperature
Accuracy Temperature Range*
0.5%
–40°C to +125°C
1.0%
–40°C to +125°C
0.5%
–40°C to +125°C
1.0%
–40°C to +125°C
0.5%
–40°C to +125°C
1.0%
–40°C to +125°C
1.0%
–40°C to +125°C
1.0%
–40°C to +125°C
1.0%
–40°C to +125°C
Package
TO-92
TO-92
8-pin SOIC
8-pin SOIC
8-pin plastic DIP
8-pin plastic DIP
8-lead MM8™
8-pin SOIC
8-pin SOIC
Pin Configuration
MIC2950-xx
321
OUT
GND
IN
TO-92 (Z)
(Bottom View)
Pin Description
Pin #
MIC2950
3
Pin #
MIC2951
1
2
Pin Name
OUT
SNS
3 SHDN
24
5
GND
ERR
6 TAP
7 FB
18
IN
MIC2951-xx
OUT 1
8 IN
SNS 2
7 FB
SHDN 3
6 TAP
GND 4
5 ERR
DIP (N), SOIC (M), MM8™ (MM)
(Top View)
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
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MIC2950/2951
Absolute Maximum Ratings (Note 1)
Input Suppy Voltage (VIN) Note 5 ................. –20V to +60V
Feedback Input Voltage (VFB) Note 6, 7 ...... –1.5V to +26V
Shutdown Input Voltage (VSHDN) Note 6 ..... –0.3V to +30V
Power Dissipation (PD) Note 4 ................ Internally Limited
Storage Temperature .............................. –65°C to + 150°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
ESD, Note 3
Micrel
Operating Ratings (Note 2)
Input Supply Voltage (VIN) ........................... +2.0V to +30V
Junction Temperature (TJ) ....................................... Note 4
MIC2950-05/MIC2950-06 ..................... –40°C to +125°C
MIC2951-02/MIC2950-03 ..................... –40°C to +125°C
Electrical Characteristics
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
Output Voltage
Output Voltage
Output Voltage
Over Full Temperature Range
MIC295x-02/-05 (±0.5%), TJ = 25°C
MIC295x-03/-06 (±1%), TJ = 25°C
MIC2951-3.3 (±1%), TJ = 25°C
MIC2951-4.8 (±1%), TJ = 25°C
MIC295x-02/-05 (±0.5%), –25°C TJ +85°C
MIC295x-03/-06 (±1%), –25°C TJ +85°C
MIC2951-3.3 (±1%), –25°C TJ +85°C
MIC2951-4.8 (±1%), –25°C TJ +85°C
MIC295x-02/-05 (±0.5%), –40°C to +125°C
MIC295x-03/-06 (±1%), –40°C to +125°C
4.975
4.950
3.267
4.802
4.950
4.925
3.251
4.777
4.940
4.900
5.000
5.000
3.300
4.850
MIC2951-3.3 (±1%), –40°C to +125°C
3.234
MIC2951-4.8 (±1%), –40°C to +125°C
4.753
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
MIC2951-3.3 (±1%), Note 9
50
MIC2951-4.8 (±1%), Note 9
50
Line Regulation
MIC295x-02/-05 (±0.5%), Note 10, 11
0.03
MIC295x-03/-06 (±1%), Note 10, 11
0.04
MIC2951-3.3 (±1%), Note 10, 11
0.04
MIC2951-4.8 (±1%), Note 10, 11
0.04
Max Units
5.025 V
5.050 V
3.333 V
4.899 V
5.050 V
5.075 V
3.350 V
4.872 V
5.060 V
5.100 V
3.366 V
4.947 V
5.070 V
5.120 V
3.379 V
4.967 V
100 ppm/°C
150 ppm/°C
150 ppm/°C
150 ppm/°C
0.10 %
0.20 %
0.20 %
0.40 %
0.20 %
0.40 %
0.20 %
0.40 %
3
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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 (±0.5%), VIN = 4.5V, IL = 100µA
MIC2951-3.3 (±1%), VIN = 3.0V, IL = 100µA
MIC2951-4.8 (±1%), VIN = 4.3V, IL = 100µA
Micrel
Min Typ Max Units
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 mV
140 mV
250 300 mV
300 450 mV
600 mV
40 80 mV
150 mV
250 350 mV
320 450 mV
600 mV
40 80 mV
140 mV
250 300 mV
300 450 mV
600 mV
120 180
300
µA
µA
1.7 2.5 mA
3.5 mA
4 6 mA
8 mA
100 180
300
µA
µA
1.7 2.5 mA
4 6 mA
10 mA
120 180
300
µA
µA
1.7 2.5 mA
3.5 mA
4 6 mA
8 mA
280 350
400
µA
µA
150 350
400
µA
µA
280 350
400
µA
µA
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MIC2950/2951
Parameter
Current Limit
Thermal Regulation
Output Noise
Reference Voltage
Reference Voltage
Feedback Bias Current
Reference Voltage
Temperature Coefficient
Feedback Bias Current
Temperature Coefficient
Error Comparator (Flag)
Output Leakage Current
Error Comparator (Flag)
Output Low Voltage
Error Comparator
Upper Threshold Voltage
Error Comparator
Lower Threshold Voltage
Error Comparator Hysteresis
Condition
VOUT = 0V
Note 13
10Hz to 100kHz, CL = 1.5µF
10Hz to 100kHz, CL = 200µF
10Hz to 100kHz, CL = 3.3µF,
0.01µF bypass Feedback to Output
MIC295x-02/-05 (±0.5%)
MIC295x-03/-06 (±1%)
MIC2951-3.3 (±1%)
MIC2951-4.8 (±1%)
MIC295x-02/-05 (±0.5%), Note 14
MIC295x-03/-06 (±1%), Note 14
MIC2951-3.3 (±1%), Note 14
MIC2951-4.8 (±1%), Note 14
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
VOH = 30V
VIN = 4.5V, IOL = 200µA
Note 15
Note 15
Note 15
Micrel
Min Typ Max Units
300 400 mA
450 mA
0.05 0.20 %/W
430 µVRMS
160 µVRMS
100 µVRMS
1.220
1.200
1.210
1.200
1.210
1.200
1.210
1.200
1.190
1.185
1.185
1.185
1.235
1.235
1.235
1.235
20
20
50
50
50
0.1
1.250
1.260
V
V
1.260
1.270
V
V
1.260
1.270
V
V
1.260
1.270
V
V
1.270 V
1.285 V
1.285 V
1.285 V
40 nA
60 nA
ppm/°C
ppm/°C
ppm/°C
ppm/°C
nA/°C
0.01 1.00
2.00
µA
µA
150 250 mV
400 mV
40 60
25
mV
mV
75 95 mV
140 mV
15 mV
3
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