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LP2951-33-Q1, LP2951-50-Q1
SLVSAW6E –JUNE 2011–REVISED NOVEMBER 2014
LP2951-xx-Q1 Adjustable Micropower Voltage Regulators With Shutdown
1 Features
3 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 VTAP 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
VTAP 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.
1
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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 VO Accuracy
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1.4% at 25°C
2% Over Temperature
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 VOUT drops
by 6% of its nominal value for whatever reasons –
due to a drop in VIN, current limiting, or thermal
shutdown.
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Can Be Used as a Regulator or Reference
Stable With Low ESR (>12 mΩ) Capacitors
Current- and Thermal-Limiting Features
8-Pin Package
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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
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.
2 Applications
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Automotive Power
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Battery to MCU Regulator
Sensor Supply
Infotainment
Device Information(1)
Body Control Module
PART NUMBER
LP2951-33-Q1
LP2591-50-Q1
LP2951-50-Q1
PACKAGE
SOIC (8)
WSON (8)
BODY SIZE (NOM)
4.90 mm × 3.90 mm
3.00 mm × 3.00 mm
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Secondary Side Regulation
Point of Load Regulation
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Dropout Voltage vs Temperature
500
450
400
350
300
250
200
150
100
50
R
= 100 mA
IL
RILL = 100 µA
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.