Datasheet

1
2
3
4
8
7
6
5
INPUT
FEEDBACK
V
TAP
ERROR
OUTPUT
SENSE
SHUTDOWN
GND
LP2951
D OR P PACKAGE
(TOP VIEW)
OUTPUT
GND
INPUT
LP2950
LP PACKAGE
(BOTTOM VIEW)
LP2951
DRG PACKAGE
(TOP VIEW)
1
2
3
4
8
7
6
5
INPUT
FEEDBACK
V
TAP
ERROR
OUTPUT
SENSE
SHUTDOWN
GND
Thermal
Pad
LP2950
LP2951
www.ti.com SLVS582H –APRIL 2006–REVISED MARCH 2012
ADJUSTABLE MICROPOWER VOLTAGE REGULATORS
WITH SHUTDOWN
Check for Samples: LP2950, LP2951
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FEATURES
• Wide Input Range: Up to 30 V • Stable With Low ESR (>12 mΩ) Capacitors
• Rated Output Current of 100 mA • Current- and Thermal-Limiting Features
• Low Dropout: 380 mV (Typ) at 100 mA • LP2950 Only (3-Pin Package)
• Low Quiescent Current: 75 μA (Typ) – Fixed-Output Voltages of 5 V, 3.3 V, and 3 V
• Tight Line Regulation: 0.03% (Typ) • LP2951 Only (8-Pin Package)
• Tight Load Regulation: 0.04% (Typ) – Fixed- or Adjustable-Output Voltages:
5 V/ADJ, 3.3 V/ADJ, and 3 V/ADJ
• High V
O
Accuracy
– Low-Voltage Error Signal on Falling Output
– 1.4% at 25°C
– Shutdown Capability
– 2% Over Temperature
– Remote Sense Capability for Optimal
• Can Be Used as a Regulator or Reference
Output Regulation and Accuracy
DESCRIPTION/ORDERING INFORMATION
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.
The 8-pin LP2951 also offers additional functionality that makes it particularly suitable for battery-powered
applications. For example, a logic-compatible shutdown feature allows the regulator to be put in standby mode
for power savings. In addition, there is a built-in supervisor reset function in which the ERROR output goes low
when V
OUT
drops by 6% of its nominal value for whatever reasons – due to a drop in V
IN
, current limiting, or
thermal shutdown.
The LP2950 and LP2951 are designed to minimize all error contributions to the output voltage. With a tight
output tolerance (0.5% at 25°C), a very low output voltage temperature coefficient (20 ppm typical), extremely
good line and load regulation (0.3% and 0.4% typical), and remote sensing capability, the parts can be used as
either low-power voltage references or 100-mA regulators.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2006–2012, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.