LP2951-33-Q1 Datasheet, PDF (1/30 Pages) Texas Instruments – Adjustable Micropower Voltage Regulators With Shutdown

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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
•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
2 Applications
• Automotive Power
– Battery to MCU Regulator
– Sensor Supply
– Infotainment
– Body Control Module
• Secondary Side Regulation
• Point of Load Regulation
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 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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LP2951-33-Q1
LP2591-50-Q1
SOIC (8)
4.90 mm × 3.90 mm
LP2951-50-Q1
WSON (8)
3.00 mm × 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
RIL = 100 m A
300
250
200
150
100
RIL = 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.