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LP2950-N, LP2951-N
SNVS764O –JANUARY 2000–REVISED DECEMBER 2014
LP295x-N Series of Adjustable Micropower Voltage Regulators
1 Features
3 Description
The LP2950-N and LP2951-N are micropower
1
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Input Voltage Range: 2.3 V to 30 V
voltage regulators with very low quiescent current (75
μA typical) and very low dropout voltage (typical 40
mV at light loads and 380 mV at 100 mA). They are
ideally suited for use in battery-powered systems.
Furthermore, the quiescent current of the LP2950-
N/LP2951-N increases only slightly in dropout,
prolonging battery life.
5-V, 3-V, and 3.3-V Output Voltage Versions
Available
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High Accuracy Output Voltage
Ensured 100-mA Output Current
Extremely Low Quiescent Current
Low Dropout Voltage
Careful design of the LP2950-N/LP2951-N has
minimized all contributions to the error budget. This
includes a tight initial tolerance (0.5% typ.), extremely
good load and line regulation (.05% typ.) and a very
low output voltage temperature coefficient, making
the part useful as a low-power voltage reference.
Extremely Tight Load and Line Regulation
Very Low Temperature Coefficient
Use as Regulator or Reference
Needs Minimum Capacitance for Stability
Current and Thermal Limiting
One such feature is an error flag output which warns
of a low output voltage, often due to falling batteries
on the input. It may be used for a power-on reset. A
second feature is the logic-compatible shutdown input
which enables the regulator to be switched on and
off. Also, the part may be pin-strapped for a 5-V, 3-V,
or 3.3-V output (depending on the version), or
programmed from 1.24 V to 29 V with an external
pair of resistors.
Stable With Low-ESR Output Capacitors (10 mΩ
to 6 Ω)
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LP2951-N Versions Only:
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Error Flag Warns of Output Dropout
Logic-Controlled Electronic Shutdown
Output Programmable From 1.24 V to 29 V
2 Applications
The LP2950-N is available in the surface-mount TO-
252 package and in the popular 3-pin TO-92 package
for pin-compatibility with older 5-V regulators. The 8-
lead LP2951-N is available in plastic, ceramic dual-in-
line, WSON, or metal can packages and offers
additional system functions.
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High-Efficiency Linear Regulator
Regulator with Undervoltage Shutdown
Low dropout Battery-powered Regulator
Snap-ON/Snap-OFF Regulator
Device Information(1)
PART NUMBER PACKAGE
BODY SIZE (NOM)
4.30 mm x 4.30 mm
9.91 mm x 6.58 mm
4.90 mm x 3.91 mm
3.00 mm x 3.00 mm
4.00 mm x 4.00 mm
9.81 mm x 6.35 mm
TO-92 (3)
LP2950-N
TO-252 (3)
SOIC (8)
VSSOP (8)
LP2951-N
WSON (8)
PDIP (8)
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
LP2951 Simplified Schematic
LP2950-N Simplified Schematic
LP2951
VOUT
VIN
LP2950
OUT
IN
COUT
2.2 µF
CIN
1 µF
VOUT
VIN
SENSE
FEEDBACK
IN
OUT
COUT
2.2 µF
CIN
1 µF
VFEEDBACK
SHUTDOWN
GND
SHUTDOWN
GND
VTAP
R1
330 kꢀ
VOUT
ERROR
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.