LP2951-50QDRGRQ1 Datasheet, PDF (1/24 Pages) Texas Instruments – ADJUSTABLE MICROPOWER VOLTAGE REGULATORS WITH SHUTDOWN

LP2951-33-Q1
LP2951-50-Q1
www.ti.com
SLVSAW6D – JUNE 2011 – REVISED APRIL 2013
ADJUSTABLE MICROPOWER VOLTAGE REGULATORS WITH SHUTDOWN
Check for Samples: LP2951-33-Q1, LP2951-50-Q1
FEATURES
1
• Qualified for Automotive Applications
• Wide Input Range: Up to 35 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
• 8-Pin Package
– Fixed Voltages: 5 V/ADJ and 3.3 V/ADJ
– Low-Voltage Error Signal on Falling Output
– Shutdown Capability
– Remote Sense Capability for Optimal
Output Regulation and Accuracy
DRG PACKAGE
(TOP VIEW)
OUTPUT
SENSE
SHUTDOWN
GND
1
8
2 _Thermal 7
3 ^Pad 6
4
5
INPUT
FEEDBACK
V
TAP
ERROR
DESCRIPTION
The LP2951-xx-Q1 devices are bipolar, low-dropout voltage regulators that can accommodate a wide input
supply-voltage range of up to 35 V. The 8-pin LP2951-xx-Q1 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-xx-Q1 outputs a fixed 5 V and 3.3 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-xx-Q1 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 LP295x-xx-Q1 devices 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.
For the most-current package and ordering information, see the Package Option Addendum at the end of this
document, or see the TI Web site at www.ti.com.
1
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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011–2013, Texas Instruments Incorporated