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LP2951-33-Q1_15

更新时间： 2024-11-24 01:14:27
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德州仪器 - TI /
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Adjustable Micropower Voltage Regulators With Shutdown

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LP2951-33-Q1_15 数据手册

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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
•
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  
•
•
•
•
•
•
•
–
–
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.  
•
•
•
•
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  
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  
•
Automotive Power  
–
–
–
–
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  
•
•
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  
= 100 mA  
IL  
IL = 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.  
 
 
 
 
 
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