LP2950 Datasheet, PDF (1/32 Pages) National Semiconductor (TI) – Series of Adjustable Micropower Voltage Regulators

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LP2950, LP2951
SLVS582I – APRIL 2006 – REVISED NOVEMBER 2014
LP295x Adjustable Micropower Voltage Regulators with Shutdown
1 Features
•1 Wide Input Range: Up to 30 V
• Rated Output Current of 100 mA
• Low Dropout: 380 mV (Typ) at 100 mA
• Low Quiescent Current: 75 μA (Typ)
• Tight Line Regulation: 0.03% (Typ)
• Tight Load Regulation: 0.04% (Typ)
• High V_O Accuracy
– 1.4% at 25°C
– 2% Over Temperature
• Can Be Used as a Regulator or Reference
• Stable With Low ESR (>12 mΩ) Capacitors
• Current- and Thermal-Limiting Features
• LP2950 Only (3-Pin Package)
– Fixed-Output Voltages of 5 V, 3.3 V, and 3 V
• LP2951 Only (8-Pin Package)
– Fixed- or Adjustable-Output Voltages:
5 V/ADJ, 3.3 V/ADJ, and 3 V/ADJ
– Low-Voltage Error Signal on Falling Output
– Shutdown Capability
– Remote Sense Capability for Optimal Output
Regulation and Accuracy
2 Applications
• Applications with High-Voltage Input
• Power Supplies
3 Description
The LP2950 and LP2951 devices are bipolar, low-
dropout voltage regulators that can accommodate a
wide input supply-voltage range of up to 30 V. The
easy-to-use, 3-pin LP2950 is available in fixed-output
voltages of 5 V, 3.3 V, and 3 V. However, the 8-pin
LP2951 is able to output either a fixed or adjustable
output from the same device. By tying the OUTPUT
and SENSE pins together, and the FEEDBACK and
V_TAP pins together, the LP2951 outputs a fixed 5 V,
3.3 V, or 3 V (depending on the version).
Alternatively, by leaving the SENSE and V_TAP pins
open and connecting FEEDBACK to an external
resistor divider, the output can be set to any value
between 1.235 V to 30 V.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LP2950
TO-92 (3)
4.83 mm x 4.83 mm
LP2951
SOIC (8)
SON (8)
4.90 mm x 3.90 mm
3.00 mm x 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Dropout Voltage vs Temperature
500
450
400
350
RI_L = 100 m A
300
250
200
150
100
RI_L = 100 µA
50
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TA – Temperature – °C
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.