LP2951-N_15_15 Datasheet, PDF (1/50 Pages) Texas Instruments – LP295x-N Series of Adjustable Micropower Voltage Regulators

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LP2950-N, LP2951-N
SNVS764O – JANUARY 2000 – REVISED DECEMBER 2014
LP295x-N Series of Adjustable Micropower Voltage Regulators
1 Features
•1 Input Voltage Range: 2.3 V to 30 V
• 5-V, 3-V, and 3.3-V Output Voltage Versions
Available
• High Accuracy Output Voltage
• Ensured 100-mA Output Current
• Extremely Low Quiescent Current
• Low Dropout Voltage
• Extremely Tight Load and Line Regulation
• Very Low Temperature Coefficient
• Use as Regulator or Reference
• Needs Minimum Capacitance for Stability
• Current and Thermal Limiting
• Stable With Low-ESR Output Capacitors (10 mΩ
to 6 Ω)
• LP2951-N Versions Only:
– Error Flag Warns of Output Dropout
– Logic-Controlled Electronic Shutdown
– Output Programmable From 1.24 V to 29 V
2 Applications
• High-Efficiency Linear Regulator
• Regulator with Undervoltage Shutdown
• Low dropout Battery-powered Regulator
• Snap-ON/Snap-OFF Regulator
3 Description
The LP2950-N and LP2951-N are micropower
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.
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.
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.
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.
LP2951 Simplified Schematic
LP2951
VOUT
OUT
VIN
IN
COUT
2.2 µF
SENSE
FEEDBACK
CIN
1 µF
SHUTDOWN
SHUTDOWN
VTAP
GND
ERROR
VFEEDBACK
R1
330 k _VOUT
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
LP2950-N
TO-92 (3)
TO-252 (3)
4.30 mm x 4.30 mm
9.91 mm x 6.58 mm
SOIC (8)
4.90 mm x 3.91 mm
LP2951-N
VSSOP (8)
WSON (8)
3.00 mm x 3.00 mm
4.00 mm x 4.00 mm
PDIP (8)
9.81 mm x 6.35 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
LP2950-N Simplified Schematic
LP2950
V_IN
IN
CIN
1 µF
OUT
GND
V_OUT
COUT
2.2 µF
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.