LP2950-33

Manufacturer Part NumberLP2950-33
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
LP2950-33 datasheet
 


Specifications of LP2950-33

Iout(max)(a)0.1Vdo(typ)(mv)380
Iq(typ)(ma)0.075Vin(min)(v)3.7
Vin(max)(v)30Accuracy(%)1.4
Output Capacitor TypeElectrolyticFixed Output Options(v)3.3
Pin/package3TO-92Regulated Outputs(#)1
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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

LP2950-33 Summary of contents

  • Page 1

    ... The LP2950 and LP2951 devices are bipolar, low-dropout voltage regulators that can accommodate a wide input supply-voltage range 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 ...

  • Page 2

    ... Reel of 2000 LP2950-30LPR Tube of 50 LP2951-30P Tube of 75 LP2951-30D Reel of 2500 LP2951-30DR Reel of 1000 LP2951-30DRGR Bulk of 1000 LP2950-33LP Reel of 2000 LP2950-33LPR Tube of 50 LP2951-33P Tube of 75 LP2951-33D Reel of 2500 LP2951-33DR Reel of 1000 LP2951-33DRGR Bulk of 1000 LP2950-50LP Reel of 2000 LP2950-50LPR Tube of 50 ...

  • 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

    ... I = 100 μ μ only 200 μ 3.3 μ 0.01 μF between pins 1 and Bypass = OUT LP2950 LP2951 SLVS582G – APRIL 2006 – REVISED JULY 2011 T MIN TYP MAX UNIT J 25°C 2.970 3 3.030 2.940 3 3.060 25° ...

  • Page 6

    ... LP2950 LP2951 SLVS582G – APRIL 2006 – REVISED JULY 2011 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 ...

  • 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 ...

  • Page 10

    ... LP2950 LP2951 SLVS582G – APRIL 2006 – REVISED JULY 2011 TYPICAL CHARACTERISTICS (continued) DROPOUT VOLTAGE vs OUTPUT CURRENT 400 350 300 250 200 150 100 50 0 0.0001 0.001 I – Output Current – LP2951 FEEDBACK BIAS CURRENT vs TEMPERATURE -10 ...

  • Page 11

    ... T = 125 Input Voltage A 2 V/div Output Voltage 80 mV/div T = –40 A 0.6 0.7 0.8 0.9 Output Voltage 100 mV/div Output Load 100 mA/div LP2950 LP2951 SLVS582G – APRIL 2006 – REVISED JULY 2011 LINE TRANSIENT RESPONSE vs TIME LOAD TRANSIENT RESPONSE vs TIME ( μF) OUT L 11 ...

  • 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

    ... µF L 150 100 50 0 -40 -25 -10 1.E+04 1.E+05 10k 100k LP2950 LP2951 SLVS582G – APRIL 2006 – REVISED JULY 2011 RIPPLE REJECTION vs FREQUENCY µF L 100 10k 100k 1k 1M 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 f – Frequency – Hz LP2951 DIVIDER RESISTANCE ...

  • 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

    ... C OUT For the LP2950, no load stability is inherent in the design — a desirable feature in CMOS circuits that are put in standby (such as RAM keep-alive applications). If the LP2951 is used with external resistors to set the output voltage, a minimum load current of 1 μA is recommended through the resistor divider. ...

  • Page 16

    ... BYPASS 2p On the 3-pin LP2950, noise reduction can be achieved by increasing the output capacitor, which causes the regulator bandwidth to be reduced, therefore, eliminating high-frequency noise. However, this method is relatively inefficient, as increasing C from 1 μF to 220 μF only reduces the regulator’s output noise from 430 μV to OUT 160 μ ...

  • Page 17

    ... 1.3 V Figure 1. ERROR Output Timing pin. Alternatively, a user-programmable voltage ranging from TAP 2: . This can be offset by trimming R1. Alternatively, increasing OUT to 0.17% by increasing the divider current to ≉12 μA. This increase in the FB LP2950 LP2951 SLVS582G – APRIL 2006 – REVISED JULY 2011 (2) 17 ...

  • 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

    ... PACKAGING INFORMATION Orderable Device (1) Package Type Package Status LP2950-30LP ACTIVE TO-92 LP2950-30LPE3 ACTIVE TO-92 LP2950-30LPR ACTIVE TO-92 LP2950-30LPRE3 ACTIVE TO-92 LP2950-33LPE3 ACTIVE TO-92 LP2950-33LPRE3 ACTIVE TO-92 LP2950-50LPRE3 ACTIVE TO-92 LP2951-30D ACTIVE SOIC LP2951-30DG4 ACTIVE SOIC LP2951-30DR ACTIVE SOIC LP2951-30DRG4 ACTIVE SOIC LP2951-30DRGR ACTIVE SON LP2951-33D ACTIVE ...

  • 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 ...

  • 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 ...

  • 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 ...

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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’ ...