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LP3981
  • LP3981
  • LP3981
  • LP3981
  • LP3981
  • LP3981
  • LP3981

LP3981

ACTIVE

300-mA, high-accuracy, low-dropout voltage regulator with enable

Texas Instruments LP3981 Product Info

1 April 2026 4

Parameters

Rating

Catalog

Vin (max) (V)

6

Vin (min) (V)

2.7

Iout (max) (A)

0.3

Output options

Fixed Output

Vout (max) (V)

3.3

Vout (min) (V)

2.5

Fixed output options (V)

2.5, 2.7, 2.8, 2.83, 3, 3.3

Noise (µVrms)

35

PSRR at 100 KHz (dB)

25

Iq (typ) (mA)

0.07

Features

Enable

Thermal resistance θJA (°C/W)

57

Load capacitance (min) (µF)

2.2

Regulated outputs (#)

1

Accuracy (%)

2

Dropout voltage (Vdo) (typ) (mV)

132

Operating temperature range (°C)

-40 to 125

Package

VSSOP (DGK)-8-14.7 mm² 3 x 4.9

Features

  • 2.5-V to 6-V Input Range
  • 300-mA Output Current
  • 60-dB PSRR at 1 kHz
  • ≤ 1-µA Quiescent Current When Shut Down
  • Fast Turnon Time: 120 µs (typical) with CBYPASS =
    0.01 µF
  • 132-mV Typical Dropout with 300-mA Load
  • 35-µVrms Output Noise Over 10 Hz to 100 kHz
  • Logic Controlled Enable
  • Stable With Ceramic and High-Quality Tantalum
    Capacitors
  • Thermal Shutdown and Short-Circuit Current Limit
  • Low Thermal Resistance in WSON-6 Package
    Gives Excellent Power Capability
  • 2.5-V to 6-V Input Range
  • 300-mA Output Current
  • 60-dB PSRR at 1 kHz
  • ≤ 1-µA Quiescent Current When Shut Down
  • Fast Turnon Time: 120 µs (typical) with CBYPASS =
    0.01 µF
  • 132-mV Typical Dropout with 300-mA Load
  • 35-µVrms Output Noise Over 10 Hz to 100 kHz
  • Logic Controlled Enable
  • Stable With Ceramic and High-Quality Tantalum
    Capacitors
  • Thermal Shutdown and Short-Circuit Current Limit
  • Low Thermal Resistance in WSON-6 Package
    Gives Excellent Power Capability

Description

Performance of the LP3981 device is optimized for battery-powered systems to deliver ultra-low-noise, extremely low dropout voltage, and low quiescent current. Regulator ground current increases only slightly in dropout, further prolonging the battery life.

Power supply rejection is better than 60 dB at low frequencies. This high power supply rejection is maintained down to lower input voltage levels common to battery-operated circuits.

The device is ideal for mobile phone and similar battery-powered wireless applications. It provides up to 300 mA, from a 2.5-V to 6-V input, consuming less than 1 µA in disable mode.

The LP3981 is available in 8-pin VSSOP-8 and 6-pin WSON packages. Performance is specified for −40°C to +125°C temperature range. The device available in the following output voltages: 2.5 V, 2.7 V, 2.8 V, 2.83 V, 3 V, 3.03 V and 3.3 V as standard. Other output options can be made available; contact your local TI sales office for more information.

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