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Linear & low-dropout (LDO) regulators

LP2950

ACTIVE

100-mA, 30-V, low-dropout voltage regulator with low IQ

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Data sheet

LP2950

ACTIVE
Data sheet Order now

Product details

Output options Fixed Output Iout (max) (A) 0.1 Vin (max) (V) 30 Vin (min) (V) 2 Vout (max) (V) 5 Vout (min) (V) 3 Fixed output options (V) 3, 3.3, 5 Rating Catalog Noise (µVrms) 100 PSRR at 100 KHz (dB) 57 Iq (typ) (mA) 0.075 Thermal resistance θJA (°C/W) 97 Load capacitance (min) (µF) 1 Regulated outputs (#) 1 Accuracy (%) 3 Dropout voltage (Vdo) (typ) (mV) 110 Operating temperature range (°C) -40 to 125
Output options Fixed Output Iout (max) (A) 0.1 Vin (max) (V) 30 Vin (min) (V) 2 Vout (max) (V) 5 Vout (min) (V) 3 Fixed output options (V) 3, 3.3, 5 Rating Catalog Noise (µVrms) 100 PSRR at 100 KHz (dB) 57 Iq (typ) (mA) 0.075 Thermal resistance θJA (°C/W) 97 Load capacitance (min) (µF) 1 Regulated outputs (#) 1 Accuracy (%) 3 Dropout voltage (Vdo) (typ) (mV) 110 Operating temperature range (°C) -40 to 125
TO-92 (LP) 3 19.136 mm² 5.2 x 3.68
  • Wide input voltage range
    • VIN range : 2V to 30V
  • Wide output voltage range VOUT
    • Fixed option: 3V (legacy Chip), 3.3V, 5.0V
    • Adjustable option: 1.2V to 29V
  • Output current: 100mA
  • VOUT accuracy:
    • ±2% over line, load, and temperature (legacy chip)
    • ±1% over line, load, and temperature (new chip)
  • Quiescent current IQ (new chip): 50µA (typical)
  • Low dropout (new chip):: 340mV (typical)
  • Output current limiting and thermal shutdown
  • Stable over a wide range of ceramic output capacitor values
    • COUT range: 1µF to 100µF (new chip)
    • ESR range: 0 to 2Ω (new chip)
  • Operating junction temperature: –40°C to 125°C
  • Package option:
    • LP (3-pin TO-92)
    • D (8-pin SOIC)
    • DRG (8-pin WSON)
  • Wide input voltage range
    • VIN range : 2V to 30V
  • Wide output voltage range VOUT
    • Fixed option: 3V (legacy Chip), 3.3V, 5.0V
    • Adjustable option: 1.2V to 29V
  • Output current: 100mA
  • VOUT accuracy:
    • ±2% over line, load, and temperature (legacy chip)
    • ±1% over line, load, and temperature (new chip)
  • Quiescent current IQ (new chip): 50µA (typical)
  • Low dropout (new chip):: 340mV (typical)
  • Output current limiting and thermal shutdown
  • Stable over a wide range of ceramic output capacitor values
    • COUT range: 1µF to 100µF (new chip)
    • ESR range: 0 to 2Ω (new chip)
  • Operating junction temperature: –40°C to 125°C
  • Package option:
    • LP (3-pin TO-92)
    • D (8-pin SOIC)
    • DRG (8-pin WSON)

The LP2951 is a wide input low-dropout regulator (LDO) supporting an input voltage range from 2V to 30V and can supply up to 100mA of load current. The 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 VTAP pins together, the LP2951 gives 3.3V or 5V fixed output voltages. Alternatively, leave the SENSE and VTAP pins open and connect FEEDBACK to an external resistor divider. This configuration allows the output to be set to any value between 1.2V to 29V.

The LP2951-Q1 has a ERROR output that monitors the voltage at the feedback pin to indicate the status of the output voltage. The SHUTDOWN input and ERROR output are used for sequencing multiple power supplies in the system.

The LP2951 is a wide input low-dropout regulator (LDO) supporting an input voltage range from 2V to 30V and can supply up to 100mA of load current. The 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 VTAP pins together, the LP2951 gives 3.3V or 5V fixed output voltages. Alternatively, leave the SENSE and VTAP pins open and connect FEEDBACK to an external resistor divider. This configuration allows the output to be set to any value between 1.2V to 29V.

The LP2951-Q1 has a ERROR output that monitors the voltage at the feedback pin to indicate the status of the output voltage. The SHUTDOWN input and ERROR output are used for sequencing multiple power supplies in the system.
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Technical documentation

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Type Title Date
* Data sheet LP295x 100-mA, 30-V, adjustable voltage regulator with shutdown datasheet (Rev. K) PDF | HTML 13 Dec 2024
Application note LDO Noise Demystified (Rev. B) PDF | HTML 18 Aug 2020
Application note ESR, Stability, and the LDO Regulator (Rev. A) 07 Jan 2020
Application note LDO PSRR Measurement Simplified (Rev. A) PDF | HTML 09 Aug 2017
Application note AN-1815 LDOs Ease the Stress of Start-Up (Rev. A) 24 Apr 2013
Application note 3.6V – 5.5V Input, LDO Reference Design for MSP430 (Rev. A) 14 Jun 2010
Application note 3.6V – 5.5V Input, LDO with Dual-Level Output Reference Design for MSP430 (Rev. A) 14 Jun 2010
Application note Packaging Limits Range of Linear Regulators 08 May 2010
Application note Simple Power Solution Using LDOs for the DM365 (Rev. A) 11 Sep 2009
Application note Digital Designer's Guide to Linear Voltage Regulators & Thermal Mgmt (LDO) (Rev. A) 04 Jun 2008
Application note Ceramic Capacitors Replace Tantalum Capacitors in LDOs (Rev. A) 13 Oct 2006
Application note Understanding LDO Dropout 09 May 2005
Application note Extending the Input Voltage Range of an LDO Regulator 16 Aug 2002
Application note Understanding the Terms and Definitions of LDO Voltage Regulators 21 Oct 1999
Application note Technical Review of Low Dropout Voltage Regulator Operation And Performance 30 Aug 1999
Application brief Low Power 150-mA LDO Linear Regulators. Extended Output Voltage Adjustment Range 11 Jun 1999

Design & development

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Simulation model

LP2950-33 PSpice Transient Model

SLVM953.ZIP (22 KB) - PSpice Model
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TO-92 (LP) 3 Ultra Librarian
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