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

LP2951-50

Manufacturer Part NumberLP2951-50
DescriptionThe LP2950 and LP2951 devices are bipolar, low-dropout voltage regulators that can accommodate a wide input supply-voltage range of up to 30 V
ManufacturerTexas Instruments
LP2951-50 datasheet
 


Specifications of LP2951-50

Iout(max)(a)0.1Iq(typ)(ma)0.075
Vdo(typ)(v)0.3Vin(min)(v)1
Vin(max)(v)30Pin/package8SOIC, 8SON
Vout(min)(v)1.2Vout(max)(v)30
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ADJUSTABLE MICROPOWER VOLTAGE REGULATORS
FEATURES
1
Wide Input Range: Up to 30 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
Accuracy
O
– 1.4% at 25°C
– 2% Over Temperature
Can Be Used as a Regulator or Reference
LP2950
LP PACKAGE
(BOTTOM VIEW)
OUTPUT
OUTPUT
GND
SHUTDOWN
INPUT
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
LP2951 outputs a fixed 5 V, 3.3 V, or 3 V (depending on the version). Alternatively, by leaving the SENSE and
V
pins open and connecting FEEDBACK to an external resistor divider, the output can be set to any value
TAP
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
drops by 6% of its nominal value for whatever reasons – due to a drop in V
OUT
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.
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.
WITH SHUTDOWN
Check for Samples: LP2950,
LP2951
Stable With Low ESR (>12 mΩ) Capacitors
Current- and Thermal-Limiting Features
LP2950 Only (3-Pin Package)
– Fixed-Output Voltages of 5 V, 3.3 V, and 3 V
LP2951 Only (8-Pin Package)
– Fixed- or Adjustable-Output Voltages:
5 V/ADJ, 3.3 V/ADJ, and 3 V/ADJ
– Low-Voltage Error Signal on Falling Output
– Shutdown Capability
– Remote Sense Capability for Optimal
Output Regulation and Accuracy
LP2951
D OR P PACKAGE
(TOP VIEW)
INPUT
1
8
FEEDBACK
SENSE
2
7
V
3
6
TAP
ERROR
GND
4
5
SLVS582G – APRIL 2006 – REVISED JULY 2011
LP2951
DRG PACKAGE
(TOP VIEW)
OUTPUT
INPUT
1
8
SENSE
FEEDBACK
2
7
Thermal
Pad
SHUTDOWN
V
3
6
TAP
GND
ERROR
4
5
pins together, the
TAP
, current limiting, or
IN
Copyright © 2006–2011, Texas Instruments Incorporated
LP2950
LP2951

LP2951-50 Summary of contents

  • Page 1

    ... V. The easy-to-use, 3-pin LP2950 is available in fixed-output voltages 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 LP2951 outputs a fixed ...

  • Page 2

    ... Bulk of 1000 LP2950-50LP Reel of 2000 LP2950-50LPR Tube of 50 LP2951-50P Tube of 75 LP2951-50D Reel of 2500 LP2951-50DR Reel of 1000 LP2951-50DRGR Tube of 50 LP2951P Tube of 75 LP2951D Reel of 2500 LP2951DR Reel of 1000 LP2951DRGR Copyright © 2006–2011, Texas Instruments Incorporated www.ti.com TOP-SIDE MARKING ...

  • Page 3

    ... LP2950 FUNCTIONAL BLOCK DIAGRAM Unregulated DC + INPUT + LP2951 FUNCTIONAL BLOCK DIAGRAM Unregulated FEEDBACK 3 From SHUTDOWN CMOS or TTL 60 mV Copyright © 2006–2011, Texas Instruments Incorporated OUTPUT + − ERROR Amplifier 1.23-V Reference 8 1 INPUT OUTPUT SENSE + − ERROR Amplifier + + ERROR − ...

  • Page 4

    ... LP2950 LP2951 SLVS582G – APRIL 2006 – REVISED JULY 2011 ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range (unless otherwise noted) V Continuous input voltage range IN V SHUTDOWN input voltage range SHDN ERROR comparator output voltage range V FEEDBACK input voltage range FDBK (4) θ ...

  • Page 5

    ... C C Output noise (RMS 100 kHz LP2951-50 (1) Output or reference voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range. (2) Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specification for thermal regulation ...

  • Page 6

    ... ELECTRICAL CHARACTERISTICS (continued (nominal 100 μ OUT L 8-pin version: FEEDBACK tied OUTPUT tied to SENSE, V TAP PARAMETER (LP2951-xx) 8-PIN VERSION ONLY ADJ Reference voltage Reference voltage (5) temperature coefficient FEEDBACK bias current FEEDBACK bias current temperature coefficient ...

  • Page 7

    ... 110 100 LP2950 LP2951 SLVS582G – APRIL 2006 – REVISED JULY 2011 INPUT CURRENT vs INPUT VOLTAGE ∞ – Input Voltage – INPUT CURRENT vs INPUT VOLTAGE Ω ...

  • Page 8

    ... LP2950 LP2951 SLVS582G – APRIL 2006 – REVISED JULY 2011 TYPICAL CHARACTERISTICS (continued) OUTPUT VOLTAGE vs TEMPERATURE 5.100 5.075 5.050 5.025 I = 100 µA L 5.000 I = 100 4.975 4.950 4.925 4.900 -40 -25 - 110 125 T – Temperature – ° QUIESCENT CURRENT ...

  • Page 9

    ... R 300 250 200 150 100 110 125 -40 -25 -10 LP2950 LP2951 SLVS582G – APRIL 2006 – REVISED JULY 2011 QUIESCENT CURRENT vs TEMPERATURE = 110 125 T – Temperature – ° DROPOUT VOLTAGE vs TEMPERATURE ...

  • Page 10

    ... T – Temperature – ° LP2951 MINIMUM OPERATING VOLTAGE 2 1.95 1.9 1.85 1.8 1.75 1.7 1.65 1.6 0.01 0.1 -40 -25 -10 LP2951 ERROR COMPARATOR OUTPUT 120 145 www.ti.com vs TEMPERATURE 110 125 T – Temperature – ° ...

  • Page 11

    ... TYPICAL CHARACTERISTICS (continued) LP2951 ERROR COMPARATOR SINK CURRENT vs OUTPUT LOW VOLTAGE 2 1.75 1.5 1.25 1 0.75 0.5 0. 0.1 0.2 0.3 0.4 0.5 V – Output Low Voltage – LOAD TRANSIENT RESPONSE vs TIME ( μF) OUT L Output Voltage 100 mV/div Output Load 100 mA/div Copyright © 2006–2011, Texas Instruments Incorporated ...

  • Page 12

    ... LP2950 LP2951 SLVS582G – APRIL 2006 – REVISED JULY 2011 TYPICAL CHARACTERISTICS (continued) ENABLE TRANSIENT RESPONSE vs TIME ( μ mA OUTPUT IMPEDANCE vs FREQUENCY 100 I = 100 µ 0 100 0.01 10 100 1k 10k 1.E+01 1.E+02 1.E+03 1.E+04 f – Frequency – ENABLE TRANSIENT RESPONSE ...

  • Page 13

    ... FREQUENCY 100 1.E+01 10 1.E+02 100 1.E+03 1k 1.E+04 10k f – Frequency – Hz LP2951 OUTPUT NOISE vs FREQUENCY 200 µ 3.3 µ 1.E+01 1.E+02 1.E+03 10 100 1k f – Frequency – Hz Copyright © 2006–2011, Texas Instruments Incorporated 100 V ...

  • Page 14

    ... LP2950 LP2951 SLVS582G – APRIL 2006 – REVISED JULY 2011 TYPICAL CHARACTERISTICS (continued) SHUTDOWN THRESHOLD VOLTAGE (OFF TO ON) vs TEMPERATURE 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1 0.9 0.8 -40 -25 - – Temperature – ° SHUTDOWN THRESHOLD VOLTAGE (ON TO OFF) 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1 0.9 0 110 125 ...

  • Page 15

    ... A 1-μF (tantalum, ceramic, or aluminum) electrolytic capacitor should be placed locally at the input of the LP2950 or LP2951 if there is, or will be, significant impedance between the ac filter capacitor and the input; for example battery is used as the input or if the ac filter capacitor is located more than 10 in away. There are no ESR requirements for this capacitor, and the capacitance can be increased without limit ...

  • Page 16

    ... ERROR Function (LP2951 Only) The LP2951 has a low-voltage detection comparator that outputs a logic low when the output voltage drops by ≉6% from its nominal value, and outputs a logic high when V 95% of nominal figure is obtained by dividing the built-in offset of ≉ the 1.235-V bandgap reference, and remains independent of the programmed output voltage ...

  • Page 17

    ... Programming Output Voltage (LP2951 Only) A unique feature of the LP2951 is its ability to output either a fixed voltage or an adjustable voltage, depending on the external pin connections. To output the internally programmed fixed voltage, tie the SENSE pin to the OUTPUT pin and the FEEDBACK pin to the V the internal 1 ...

  • Page 18

    ... LP2950 LP2951 SLVS582G – APRIL 2006 – REVISED JULY 2011 Changes from Revision F (December 2009) to Revision G • Changed test condition label to "SHUTDOWN" for "SHUTDOWN input current" previously it was "Vtap". ......................... • Changed test condition label to "SHUTDOWN" for "SHUTDOWN input current" previously it was "Vtap". ......................... ...

  • Page 19

    ... ACTIVE SOIC LP2951-33DG4 ACTIVE SOIC LP2951-33DR ACTIVE SOIC LP2951-33DRG4 ACTIVE SOIC LP2951-33DRGR ACTIVE SON LP2951-50D ACTIVE SOIC LP2951-50DG4 ACTIVE SOIC LP2951-50DR ACTIVE SOIC Pins Package Qty (2) Eco Plan Drawing Ball Finish LP 3 1000 Pb-Free (RoHS 1000 Pb-Free (RoHS 2000 ...

  • Page 20

    ... Orderable Device (1) Package Type Package Status LP2951-50DRG4 ACTIVE SOIC LP2951-50DRGR ACTIVE SON LP2951D ACTIVE SOIC LP2951DG4 ACTIVE SOIC LP2951DR ACTIVE SOIC LP2951DRG4 ACTIVE SOIC (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. ...

  • Page 21

    ... OTHER QUALIFIED VERSIONS OF LP2951-50 : • Automotive: LP2951-50-Q1 NOTE: Qualified Version Definitions: Automotive - Q100 devices qualified for high-reliability automotive applications targeting zero defects • PACKAGE OPTION ADDENDUM Addendum-Page 3 23-Jul-2011 ...

  • Page 22

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing LP2951-30DR SOIC LP2951-30DRGR SON DRG LP2951-33DR SOIC LP2951-33DRGR SON DRG LP2951-50DR SOIC LP2951-50DRGR SON DRG LP2951DR SOIC PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel Diameter Width (mm) W1 (mm 2500 330.0 12.4 ...

  • Page 23

    ... Device Package Type LP2951-30DR SOIC LP2951-30DRGR SON LP2951-33DR SOIC LP2951-33DRGR SON LP2951-50DR SOIC LP2951-50DRGR SON LP2951DR SOIC PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm 2500 DRG 8 1000 D 8 2500 DRG 8 1000 D 8 2500 ...

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  • Page 29

    LP (O-PBCY-W3) 0.205 (5,21) 0.175 (4,44) 0.157 (4,00) MAX 0.104 (2,65) FORMED LEAD OPTION 0.135 (3,43) MIN 0.055 (1,40) 0.045 (1,14) 0.105 (2,67) 0.080 (2,03) NOTES: A. All linear dimensions are in inches (millimeters). B. This drawing is subject to ...

  • Page 30

    MECHANICAL DATA MSOT002A – OCTOBER 1994 – REVISED NOVEMBER 2001 LP (O-PBCY-W3) 1.260 (32,00) 0.905 (23,00) 0.650 (16,50) 0.098 (2,50) 0.610 (15,50) 0.433 (11,00) 0.335 (8,50) NOTES: A. All linear dimensions are in inches (millimeters). B. This drawing is subject ...

  • Page 31

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...