contact-fact Micrel Semiconductor, contact-fact Datasheet

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Manufacturer Part Number
contact-fact
Description
Mic2950/mic2951 150ma Low-dropout Voltage Regulator
Manufacturer
Micrel Semiconductor
Datasheet
General Description
The MIC2950 and MIC2951 are “bulletproof” micropower volt-
age 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 protec-
tion 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.
Block Diagram
July 2005
MIC2950/2951
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
Control Logic
TTL/CMOS
Unregulated
DC Supply
Input
SHDN
F B
1.23V
60mV
R E F .
Amp.
Error
Error Detection
IN
Comparator
1
Features
Applications
182k
60k
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)
Automotive Electronics
Battery Powered Equipment
Cellular Telephones
SMPS Post-Regulator
Voltage Reference
Avionics
High Efficiency Linear Power Supplies
150mA Low-Dropout Voltage Regulator
OUT
S N S
T AP
E R R
GND
MIC2950/2951
1.5µF
330k
5V/150mA
Output
TTL/CMOS
Compatible
Error Output
MIC2950/2951
Micrel, Inc.

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contact-fact Summary of contents

Page 1

MIC2950/2951 General Description The MIC2950 and MIC2951 are “bulletproof” micropower volt- age 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 ...

Page 2

... This greatly reduces the error in the overall circuit, and is the result of careful design techniques and process control. Pb-Free** Voltage Accuracy MIC2950-05YZ 5.0V MIC2950-06YZ 5.0V MIC2951-02YM 5.0V MIC2951-03YM 5.0V Contact Factory 5.0V MIC2951-03YN 5.0V MIC2951-03YMM 5.0V MIC2951-3.3YM 3.3V OUT SHDN IN GND Pin Function ...

Page 3

MIC2950/2951 Absolute Maximum Ratings Input Suppy Voltage (V ) Note 5 ..................–20V to +60V IN Feedback Input Voltage (V ) Note 6, 7 .......–1.5V to +26V FB Shutdown Input Voltage (V ) Note 6 ........–0.3V to +30V SHDN Power Dissipation ...

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MIC2950/2951 Parameter Condition Load Regulation MIC295x-02/-05 (±0.5%), 100µA ≤ I MIC295x-03/-06 (±1%), 100µA ≤ I MIC2951-3.3 (±1%), 100µA ≤ I MIC2951-4.8 (±1%), 100µA ≤ I Dropout Voltage MIC295x-02/-03/-05/-06, I MIC295x-02/-03/-05/-06, I MIC295x-02/-03/-05/-06, I MIC2951-3.3 (±1%), I MIC2951-3.3 (±1%), I MIC2951-3.3 ...

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MIC2950/2951 Parameter Condition Current Limit V OUT Thermal Regulation Note 13 Output Noise 10Hz to 100kHz, C 10Hz to 100kHz, C 10Hz to 100kHz, C 0.01µF bypass Feedback to Output Reference Voltage MIC295x-02/-05 (±0.5%) MIC295x-03/-06 (±1%) MIC2951-3.3 (±1%) MIC2951-4.8 (±1%) ...

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MIC2950/2951 Parameter Condition Shutdown Input Logic Voltage MIC295x-02/-05 (±0.5%) Low High MIC295x-03/-06 (±1%) Low High MIC2951-3.3 (±1%) Low High MIC2951-4.8 (±1%) Low High Shutdown Input Current V SHUTDOWN V SHUTDOWN Regulator Output Current Note 7 in Shutdown Note 1. Exceeding ...

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MIC2950/2951 Typical Characteristics Ground Pin Current 10 1 0.1 0.01 0 LOAD CURRENT (mA) Input Current 160 150 140 Ω 130 L 120 110 100 ...

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MIC2950/2951 MIC2951 Minimum Operating Voltage 2.2 2.1 2.0 1.9 1.8 1.7 1.6 -75 -50 - 100 125 150 TEMPERATURE (°C) MIC2951 Error Comparator Output OUT 6 4 HYSTERESIS 2 0 SEPARATE 5V ...

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MIC2950/2951 Ripple Rejection 50µ 100 1.5 µ OUT ...

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MIC2950/2951 Applications Information Automotive Applications The MIC2950/2951 are ideally suited for automotive ap- plications 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 ...

Page 11

MIC2950/2951 Noise can be reduced fourfold by a bypass capacitor across R , since it reduces the high frequency gain from 4 to unity. 1 Pick: 1 ≅ C BYPASS π • 200 Hz 1 4.75V OUTPUT VOLTAGE ...

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MIC2950/2951 + 30V I L LOAD OUT MIC2951 3 SHUTDOWN S D INPUT GND Low Drift Current Source • EARLY WARNING FLAG ON LOW ...

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MIC2950/2951 + 470k + OUT 470k MIC2951 Latch Off When Error Flag Occurs + 6V LEAD- ACID ...

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MIC2950/2951 + LEAD- ACID ≈ 400kΩ* FOR 5.5V * Sets disconnect voltage ** Sets disconnect hysteresis For values shown, Regulator ...

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MIC2950/2951 Package Information 0.150 (3.81) 0.045 (1.14) 0.018 (0.57) July 2005 MAX ) PIN 1 INCHES (MM) 0.013 (0.33) TYP 0.0040 (0.102) 0°–8° 0.189 (4.8) PLANE 8-Pin SOIC (M) PIN 1 INCH (MM) 0.370 (9.40) 0.125 (3.18) 0.130 (3.30) 0.100 ...

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MIC2950/2951 0.112 (2.84) 0.032 (0.81) 0.012 (0.03) 0.0256 (0.65) TYP MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA + 1 (408) 944-0800 TEL This information furnished by Micrel in this data sheet is believed to be accurate and ...

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