Top

Product details

Parameters

Output options Fixed Output Iout (Max) (A) 0.3 Vin (Max) (V) 6 Vin (Min) (V) 2.7 Vout (Max) (V) 3.3 Vout (Min) (V) 2.5 Fixed output options (V) 2.5, 2.7, 2.8, 3, 3.3 Noise (uVrms) 35 Iq (Typ) (mA) 0.07 Thermal resistance θJA (°C/W) 57 Load capacitance (Min) (µF) 2.2 Rating Catalog Regulated outputs (#) 1 Features Enable Accuracy (%) 1 PSRR @ 100 KHz (dB) 25 Dropout voltage (Vdo) (Typ) (mV) 132 Operating temperature range (C) -40 to 125 open-in-new Find other Linear regulators (LDO)

Package | Pins | Size

VSSOP (DGK) 8 15 mm² 3 x 4.9 WSON (NGC) 6 12 mm² 3 x 4 open-in-new Find other Linear regulators (LDO)

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
open-in-new Find other Linear regulators (LDO)

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.

open-in-new Find other Linear regulators (LDO)
Download
Similar products you might be interested in
open-in-new Compare products
Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
TLV758P ACTIVE 500-mA, low-IQ, high-accuracy, adjustable ultra-low-dropout voltage regulator with enable 500-mA LDO with adjustable output for cost-sensitive solutions
NEW TPS7A20 PREVIEW 300-mA, low-noise, ultra-low-IQ, low-dropout (LDO) voltage regulator with high-PSRR 300-mA LDO with improved noise, PSRR and IQ performance in smaller size for cost-sensitive solutions

Technical documentation

= Featured
No results found. Please clear your search and try again. View all 5
Type Title Date
* Datasheet LP3981 Micropower, 300-mA Ultra-Low-Dropout CMOS Voltage Regulator datasheet (Rev. H) Jul. 18, 2015
Technical articles LDO basics: capacitor vs. capacitance Aug. 01, 2018
Technical articles LDO Basics: Preventing reverse current Jul. 25, 2018
Technical articles LDO basics: introduction to quiescent current Jun. 20, 2018
Technical articles LDO basics: noise – part 1 Jun. 14, 2017

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Reference designs

REFERENCE DESIGNS Download
Xilinx Zynq 7000 Series (XC7Z045) 20W Reference Design
PMP10613 The PMP10613 reference design provides all the power supply rails necessary to power Xilinx® Zynq® 7000 series (XC7Z045)  FPGA.   This design uses several LMZ3 series modules, LDOs, and a DDR termination regulator to provide all the necessary rails to power the FPGA.  It (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VSSOP (DGK) 8 View options
WSON (NGC) 6 View options

Ordering & quality

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos

Related videos