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LP2950, LP2951, NCV2951
100 mA, Low Power Low
Dropout Voltage Regulator
The LP2950 and LP2951 are micropower voltage regulators that are
specifically designed to maintain proper regulation with an extremely
low input−to−output voltage differential. These devices feature a very
low quiescent bias current of 75
mA
and are capable of supplying
output currents in excess of 100 mA. Internal current and thermal
limiting protection is provided.
The LP2951 has three additional features. The first is the Error
Output that can be used to signal external circuitry of an out of
regulation condition, or as a microprocessor power−on reset. The
second feature allows the output voltage to be preset to 5.0 V, 3.3 V or
3.0 V output (depending on the version) or programmed from 1.25 V
to 29 V. It consists of a pinned out resistor divider along with direct
access to the Error Amplifier feedback input. The third feature is a
Shutdown input that allows a logic level signal to turn−off or turn−on
the regulator output.
Due to the low input−to−output voltage differential and bias current
specifications, these devices are ideally suited for battery powered
computer, consumer, and industrial equipment where an extension of
useful battery life is desirable. The LP2950 is available in the three
pin case 29 and DPAK packages, and the LP2951 is available in the
eight pin dual−in−line, SOIC−8 and Micro8 surface mount packages.
The ‘A’ suffix devices feature an initial output voltage tolerance
±
0.5%.
Features
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TO−92
Z SUFFIX
CASE 29
Pin: 1. Output
2. Ground
3. Input
3
STRAIGHT LEAD
BULK PACK
12
1
3
BENT LEAD
TAPE & REEL
AMMO PACK
2
4
1 2
PIN CONNECTIONS
Pin: 1. Input
2. Ground
3. Output
3
1
2
3
DPAK
DT SUFFIX
CASE 369C
(Top View)
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
SOIC−8
D SUFFIX
CASE 751
PDIP−8
N SUFFIX
CASE 626
Micro8E
DM SUFFIX
CASE 846A
•
Low Quiescent Bias Current of 75
mA
•
Low Input−to−Output Voltage Differential of 50 mV at 100
mA
and
•
•
•
•
•
•
380 mV at 100 mA
5.0 V, 3.3 V or 3.0 V
±
0.5% Allows Use as a Regulator or Reference
Extremely Tight Line and Load Regulation
Requires Only a 1.0
mF
Output Capacitor for Stability
Internal Current and Thermal Limiting
Pb−Free Packages are Available
NCV Prefix for Automotive and Other Applications Requiring Site
and Control Changes
8
1
8
1
8
1
LP2951 Additional Features
PIN CONNECTIONS
Output 1
Sense 2
Shutdown 3
GND 4
(Top View)
8
7
6
5
Input
Feedback
V
O
Tap
Error Output
•
Error Output Signals an Out of Regulation Condition
•
Output Programmable from 1.25 V to 29 V
•
Logic Level Shutdown Input
(See Following Page for Device Information.)
ORDERING & MARKING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on pages 14 and 16 of this data sheet.
See general marking information in the device marking
section on page 18 of this data sheet.
©
Semiconductor Components Industries, LLC, 2010
November, 2010
−
Rev. 24
1
Publication Order Number:
LP2950/D
LP2950, LP2951, NCV2951
DEVICE INFORMATION
Output Voltage
Package
TO−92
Suffix Z
DPAK
Suffix DT
SOIC−8
SOIC−8
Suffix D
Micro8
Suffix DM
DIP−8
Suffix N
3.0 V
LP2950CZ−3.0
LP2950ACZ−3.0
LP2950CDT−3.0
LP2950ACDT−3.0
−
LP2951CD−3.0
LP2951ACD−3.0
LP2951CDM−3.0
LP2951ACDM−3.0
LP2951CN−3.0
LP2951ACN−3.0
3.3 V
LP2950CZ−3.3
LP2950ACZ−3.3
LP2950CDT−3.3
LP2950ACDT−3.3
NCV2951ACD−3.3R2
LP2951CD−3.3
LP2951ACD−3.3
LP2951CDM−3.3
LP2951ACDM−3.3
LP2951CN−3.3
LP2951ACN−3.3
5.0 V
LP2950CZ−5.0
LP2950ACZ−5.0
LP2950CDT−5.0
LP2950ACDT−5.0
NCV2951ACDR2
LP2951CD
LP2951ACD
LP2951CDM
LP2951ACDM
LP2951CN
LP2951ACN
Adjustable
Not
Available
Not
Available
NCV2951CDR2
LP2951CD
LP2951ACD
LP2951CDM
LP2951ACDM
LP2951CN
LP2951ACN
Operating Ambient
Temperature Range
T
A
=
−40°
to +125°C
T
A
=
−40°
to +125°C
T
A
=
−40°
to +125°C
T
A
=
−40°
to +125°C
T
A
=
−40°
to +125°C
T
A
=
−40°
to +125°C
LP2950Cx−xx / LP2951Cxx−xx
LP2950ACx−xx / LP2951ACxx−xx
1% Output Voltage Precision at T
A
= 25°C
0.5% Output Voltage Precision at T
A
= 25°C
Input
Battery or
Unregulated DC
3
182 k
Error Amplifier
1.23 V
Reference
GND
2
Output
1
5.0 V/100 mA
1.0
mF
60 k
LP2950CZ−5.0
Battery or
Unregulated DC
Input
8
Output
1
Sense
182 k
2
5.0 V/100 mA
1.0
mF
V
O
Tap
6
60 k
7
Error
Amplifier
60 k
50 k
75 mV/
60 mV
Feedback
330 k
Shutdown
From
3
CMOS/TTL
Error
Output
To CMOS/TTL
5
1.23 V
Reference
GND
4
Error Detection
Comparator
LP2951CD or CN
This device contains 34 active transistors.
Figure 1. Representative Block Diagrams
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2
LP2950, LP2951, NCV2951
MAXIMUM RATINGS
(T
A
= 25°C, unless otherwise noted.)
Rating
Input Voltage
Peak Transient Input Voltage (t < 20 ms)
Power Dissipation and Thermal Characteristics
Maximum Power Dissipation
Case 751(SOIC−8) D Suffix
Symbol
V
CC
V
CC
P
D
Value
30
32
Internally Limited
180
45
92
6.0
160
83
105
240
−1.5
to +30
−0.3
to +30
−0.3
to +30
−40
to +125
+150
−65
to +150
Unit
Vdc
Vdc
W
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
Á Á
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
Case 369A (DPAK) DT Suffix (Note 1)
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
Case 29 (TO−226AA/TO−92) Z Suffix
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Case
Case 626 N Suffix
Thermal Resistance, Junction−to−Ambient
Case 846A (Micro8) DM Suffix
Thermal Resistance, Junction−to−Ambient
Feedback Input Voltage
Shutdown Input Voltage
Error Comparator Output Voltage
Operating Ambient Temperature Range
Maximum Die Junction Temperature Range
Storage Temperature Range
R
qJA
V
fb
V
sd
V
err
T
A
T
J
T
stg
°C/W
Vdc
Vdc
Vdc
°C
°C
°C
R
qJA
°C/W
R
qJA
R
qJC
°C/W
°C/W
R
qJA
R
qJC
°C/W
°C/W
R
qJA
°C/W
°C/W
R
qJC
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
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3
LP2950, LP2951, NCV2951
unless otherwise noted.)
ELECTRICAL CHARACTERISTICS
(V
in
= V
O
+ 1.0 V, I
O
= 100
mA,
C
O
= 1.0
mF,
T
A
= 25°C [Note 3],
Characteristic
Output Voltage, 5.0 V Versions
V
in
= 6.0 V, I
O
= 100
mA,
T
A
= 25°C
LP2950C−5.0/LP2951C/NCV2951C*
LP2950AC−5.0/LP2951AC/NCV2951AC*
T
A
=
−
40 to +125°C
LP2950C−5.0/LP2951C/NCV2951C*
LP2950AC−5.0/LP2951AC/NCV2951AC*
V
in
= 6.0 to 30 V, I
O
= 100
mA
to 100 mA, T
A
=
−
40 to +125°C
LP2950C−5.0/LP2951C/NCV2951C*
LP2950AC−5.0/LP2951AC/NCV2951AC*
Output Voltage, 3.3 V Versions
V
in
= 4.3 V, I
O
= 100
mA,
T
A
= 25°C
LP2950C−3.3/LP2951C−3.3
LP2950AC−3.3/LP2951AC−3.3/NCV2951AC−3.3*
T
A
=
−
40 to +125°C
LP2950C−3.3/LP2951C−3.3
LP2950AC−3.3/LP2951AC−3.3/NCV2951AC−3.3*
V
in
= 4.3 to 30 V, I
O
= 100
mA
to 100 mA, T
A
=
−
40 to +125°C
LP2950C−3.3/LP2951C−3.3
LP2950AC−3.3/LP2951AC−3.3/NCV2951AC−3.3*
Output Voltage, 3.0 V Versions
V
in
= 4.0 V, I
O
= 100
mA,
T
A
= 25°C
LP2950C−3.0/LP2951C−3.0
LP2950AC−3.0/LP2951AC−3.0
T
A
=
−
40 to +125°C
LP2950C−3.0/LP2951C−3.0
LP2950AC−3.0/LP2951AC−3.0
V
in
= 4.0 to 30 V, I
O
= 100
mA
to 100 mA, T
A
=
−
40 to +125°C
LP2950C−3.0/LP2951C−3.0
2.928
−
3.072
3.042
2.940
2.964
−
−
3.060
3.036
2.970
2.985
3.000
3.000
3.030
3.015
V
O
3.221
3.254
−
−
3.379
3.346
V
3.234
3.260
−
−
3.366
3.340
3.267
3.284
3.300
3.300
3.333
3.317
V
O
4.880
4.925
−
−
5.120
5.075
V
4.900
4.940
−
−
5.100
5.060
4.950
4.975
5.000
5.000
5.050
5.025
Symbol
V
O
Min
Typ
Max
Unit
V
LP2950AC−3.0/LP2951AC−3.0
2.958
−
1. The Junction−to−Ambient Thermal Resistance is determined by PCB copper area per Figure 29.
2. This device series contains ESD protection and exceeds the following tests:
Human Body Model (HBM), 2000 V, Class 2, JESD22 A114−C
Machine Model (MM), 200 V, Class B, JESD22 A115−A
Charged Device Model (CDM), 2000 V, Class IV, JESD22 C101−C
3. Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
4. V
O(nom)
is the part number voltage option.
5. Noise tests on the LP2951 are made with a 0.01
mF
capacitor connected across Pins 7 and 1.
*NCV prefix is for automotive and other applications requiring site and change control.
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