LP2950 Regulator Datasheet

LP2950 Datasheet, PDF, Equivalent


Part Number

LP2950

Description

100mA Low-Dropout Voltage Regulator

Manufacture

Micrel

Total Page 14 Pages
Datasheet
Download LP2950 Datasheet


LP2950
LP2950/2951
Micrel
LP2950/2951
100mA Low-Dropout Voltage Regulator
General Description
Features
The LP2950 and LP2951 are micropower voltage regulators
with very low dropout voltage (typically 40mV at light loads
and 380mV at 100mA), and very low quiescent current (75µA
typical). The quiescent current of the LP2950/LP2951
increases only slightly in dropout, thus prolonging battery life.
This feature, among others, makes the LP2950 and LP2951
ideally suited for use in battery-powered systems.
Available in a 3-Pin TO-92 package, the LP2950 is pin-
compatible with the older 5V regulators. Additional system
functions, such as programmable output voltage and logic-
controlled shutdown, are available in the 8-pin DIP and 8-pin
SOIC versions of the LP2951.
Applications
• Automotive Electronics
• Voltage Reference
• Avionics
• High accuracy 5V, guaranteed 100 mA 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 1µF for stability
• Current and thermal limiting
LP2951 Versions Only
• Error flag warns of output dropout
• Logic-controlled electronic shutdown
• Output programmable from 1.24 to 29V
Block Diagram and Pin Configurations
UNREGULATED DC
+ 78
FEEDBACK
INPUT
1
OUTPUT
FROM
CMOS
OR TTL
3
SHUT-
DOWN
60 mV
+
1.23 V +
REF.
+
ERROR
AMPLIFIER
+
182
k
60
k
ERROR
DETECTION
COMPARATOR
5V
150 mA
MAX.
2
SENSE
6
5V TAP
5
ERROR
4
GROUND
+
1.5 µF
330
k
TO CMOS
OR TTL
LP2950 and LP2951 Block Diagram
(Pin Numbers Refer to LP2951)
32 1
OUTPUT
INPUT
GROUND
OUTPUT
SENSE
SHUTDOWN
GROUND
1
2
3
4
8
INPUT
7
FEEDBACK
6
5V TAP
5
ERROR
TO-92 Plastic Package Bottom View
(BZ)
DIP and SO Packages
(BN and BM)
See MIC2950 for a part with 1) higher output (150 mA), 2) transient protection (60V), and 3) reverse input protection to –20V)
February 1999
3-35
3

LP2950
LP2950/2951
Additional features available with the LP2951 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 5V output,
or programmed from 1.24V to 29V with the use of two external
resistors.
The LP2950 is available as either an -02 or -03 version. The
-02 and -03 versions are guaranteed for junction temperatures
Micrel
from –40°C to +125°C; the -02 version has a tighter output and
reference voltage specification range over temperature. The
LP2951 is available as an -02 or -03 version.
The LP2950 and LP2951 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 (0.05% 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
LP2950-02BZ
5.0V
LP2950-03BZ
5.0V
LP2951-02BM
5.0V
LP2951-03BM
5.0V
LP2951-02BN
5.0V
LP2951-03BN
5.0V
LP2951-4.8BM
4.85V
* Junction temperatures
Temperature Range*
Package
Accuracy
–40°C to +125°C 3-Pin TO-92 plastic 0.5%
–40°C to +125°C 3-Pin TO-92 plastic 1.0%
–40°C to +125°C
8-Pin SOIC
0.5%
–40°C to +125°C
8-Pin SOIC
1.0%
–40°C to +125°C
8-Pin Plastic DIP
0.5%
–40°C to +125°C
8-Pin Plastic DIP
1.0%
–40°C to +125°C
8-Pin SOIC
1.0%
Absolute Maximum Ratings
If Military/Aerospace specified devices are required, contact your local
Micrel representative/distributor for availability and specifications.
Power dissipation
Internally Limited
Lead Temperature (Soldering, 5 seconds)
260°C
Storage Temperature Range
–65°C to +150°C
Operating Junction Temperature Range (Note 8)
LP2950, LP2951
Input Supply Voltage
–40°C to +125°C
–0.3V to +30V
Feedback Input Voltage (Notes 9 and 10)
–1.5V to +30V
Shutdown Input Voltage (Note 9)
–0.3V to +30V
Error Comparator Output Voltage (Note 9)
–0.3V to +30V
ESD Rating is to be determined.
3-36
February 1999


Features LP2950/2951 Micrel LP2950/2951 100mA Lo w-Dropout Voltage Regulator General De scription Features The LP2950 and LP2 951 are micropower voltage regulators w ith very low dropout voltage (typically 40mV at light loads and 380mV at 100mA ), and very low quiescent current (75µ A typical). The quiescent current of th e LP2950/LP2951 increases only slightly in dropout, thus prolonging battery li fe. This feature, among others, makes t he LP2950 and LP2951 ideally suited for use in battery-powered systems. Availa ble in a 3-Pin TO-92 package, the LP295 0 is pincompatible with the older 5V re gulators. Additional system functions, such as programmable output voltage and logiccontrolled shutdown, are availabl e in the 8-pin DIP and 8-pin SOIC versi ons of the LP2951. Applications • Aut omotive Electronics • Voltage Referen ce • Avionics • High accuracy 5V, guaranteed 100 mA output • Extremely low quiescent current • Low-dropout v oltage • Extremely tight load and line regulation • Very low temperature coe.
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