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Product details

Parameters

Output options Fixed Output Iout (Max) (A) 0.3 Vin (Max) (V) 3.6 Vin (Min) (V) 1.65 Vout (Max) (V) 3 Vout (Min) (V) 1.2 Fixed output options (V) 1.2, 1.3, 1.5, 2.8, 3 Noise (uVrms) 280 Iq (Typ) (mA) 0.05 Thermal resistance θJA (°C/W) 190 Approx. price (US$) 0.20 | 1ku Load capacitance (Min) (µF) 4.7 Rating Catalog Regulated outputs (#) 1 Features Enable Accuracy (%) 2 PSRR @ 100 KHz (dB) 25 Dropout voltage (Vdo) (Typ) (mV) 75 Operating temperature range (C) -40 to 125 open-in-new Find other Linear regulators (LDO)

Package | Pins | Size

DSBGA (YZR) 4 2 mm² 1 x 1.47 open-in-new Find other Linear regulators (LDO)

Features

  • Input Voltage From 1.65 V to 4 V
  • Output Voltage From 0.8 V to 3 V
  • 1% Accuracy at Room Temperature
  • 125-mV Dropout at 300-mA Load
  • 50-µA Quiescent Current at 1-mA Load
  • Inrush Current Controlled to 600 mA
  • PSRR 65 dB at 1 kHz
  • 100-µs Start-Up Time for 1.5-V VOUT
  • Stable With Ceramic Capacitors as Small as 0402
  • Thermal-Overload and Short-Circuit Protection
open-in-new Find other Linear regulators (LDO)

Description

Operating from a minimum input voltage of 1.65 V, the LP3991 LDO has been designed to provide fixed stable output voltages for load currents up to 300 mA. This device is suitable where accurate low voltages are required from low input voltage sources and is therefore suitable for post regulation of switched mode regulators. In such applications, significant improvements in performance and EMI can be realized, with little reduction in overall efficiency. The LP3991 provides fixed outputs as low as 1.2 V from a wide input range from 1.65 V to 4 V Using the enable (EN) pin, the device may be controlled to provide a shutdown state, in which negligible supply current is drawn.

The LP3991 is designed to be stable with space-saving ceramic capacitors as small as 0402 case size.

Performance is specified for a –40°C to +125°C junction temperature range. For output voltage options, contact your local Texas Instruments sales office.

For all available packages, see the orderable addendum at the end of the datasheet.

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

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Type Title Date
* Datasheet LP3991 300-mA LDO for Digital Applications datasheet (Rev. J) Jun. 15, 2016
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
Selection guides TI Components for Aerospace and Defense Guide (Rev. E) Mar. 22, 2017
User guides AN-1416 LP3991TL DSBGA Evaluation Board Information (Rev. B) Apr. 30, 2013

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$25.00
Description

The LP3991 is a 300mA Linear Voltage Regulator for Digital Applications. Operating from a minimum input voltage of 1.65V, the LP3991 regulator has been designed to provide fixed stable output voltages for load currents up to 300mA. This device is suitable where accurate, low voltages are required (...)

Features
  • Operation from 1.65V to 3.6V Input
  • 1% accuracy at room temperature
  • Output Voltage from 1.2V to 2.8V
  • 125mV Dropout at 300mA load
  • 50 µA Quiescent Current at 1mA Load
  • Inrush Current controlled to 600mA
  • PSRR 65dB at 1kHz
  • 100 µs Start-Up time for 1.5VOUT
  • Stable with Ceramic capacitors as small as 0402
  • (...)
EVALUATION BOARDS Download
document-generic User guide
$25.00
Description

The LP3991 is a 300mA Linear Voltage Regulator for Digital Applications. Operating from a minimum input voltage of 1.65V, the LP3991 regulator has been designed to provide fixed stable output voltages for load currents up to 300mA. This device is suitable where accurate, low voltages are required (...)

Features
  • Operation from 1.65V to 3.6V Input
  • 1% accuracy at room temperature
  • Output Voltage from 1.2V to 2.8V
  • 125mV Dropout at 300mA load
  • 50 µA Quiescent Current at 1mA Load
  • Inrush Current controlled to 600mA
  • PSRR 65dB at 1kHz
  • 100 µs Start-Up time for 1.5VOUT
  • Stable with Ceramic capacitors as small as 0402
  • (...)

Reference designs

REFERENCE DESIGNS Download
Xilinx® Zynq® 7000 series (XC7Z015) Power Solution, 8W - Reference Design
PMP10601 The PMP10601 reference design provides all the power supply rails necessary to power Xilinx® Zynq® 7000 series (XC7Z015)  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 also (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Xilinx Kintex UltraScale XCKU040 FPGA Power Solution, 6W Reference Design
PMP10630 The PMP10630 reference design is a complete high density power solution for Xilinx® Kintex® UltraScale™ XCKU040 FPGA. This design uses an optimal combination of SIMPLE SWITCHER® modules and LDOs to provide all the necessary voltage rails in a small solution size of 36 x 43 mm (1.4 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Xilinx® Zynq®7000 series (XC7Z015) Power Solution, 5W - Reference Design
PMP10600 The PMP10600.1 reference design provides all the power supply rails necessary to power Xilinx® Zynq® 7000 series (XC7Z015) FPGA.   This design uses several LMZ3 series modules, LDOs, and a DDR termination regulator.  It also features one LM3880 for power up and power down (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
DSBGA (YZR) 4 View options

Ordering & quality

Support & training

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