LP38798

ACTIVE

800-mA, 20-V, low-noise, high-PSRR, adjustable low-dropout voltage regulator with enable

Product details

Output options Adjustable Output Iout (max) (A) 0.8 Vin (max) (V) 20 Vin (min) (V) 3 Vout (max) (V) 19.8 Vout (min) (V) 1.2 Noise (µVrms) 5 Iq (typ) (mA) 1.4 Thermal resistance θJA (°C/W) 35 Rating Catalog Load capacitance (min) (µF) 1 Regulated outputs (#) 1 Features Enable Accuracy (%) 2 PSRR at 100 KHz (dB) 65 Dropout voltage (Vdo) (typ) (mV) 200 Operating temperature range (°C) -40 to 125
Output options Adjustable Output Iout (max) (A) 0.8 Vin (max) (V) 20 Vin (min) (V) 3 Vout (max) (V) 19.8 Vout (min) (V) 1.2 Noise (µVrms) 5 Iq (typ) (mA) 1.4 Thermal resistance θJA (°C/W) 35 Rating Catalog Load capacitance (min) (µF) 1 Regulated outputs (#) 1 Features Enable Accuracy (%) 2 PSRR at 100 KHz (dB) 65 Dropout voltage (Vdo) (typ) (mV) 200 Operating temperature range (°C) -40 to 125
WSON (DNT) 12 16 mm² 4 x 4
  • Wide Operating Input Voltage Range:
    3 V to 20 V
  • Ultra-Low Output Noise: 5 µVRMS
    (10 Hz to 100 kHz)
  • High PSRR: 90 dB at 10 kHz, 60 dB at 100 kHz
  • ±1% Output Voltage Initial Accuracy (TJ = 25°C)
  • Very Low Dropout: 200 mV (Typical) at 800 mA
  • Stable with Ceramic or Tantalum Output Capacitors
  • Excellent Line and Load Transient Response
  • Current Limit and Overtemperature Protection
  • Create a Custom Design Using the LP38798 With the WEBENCH Power Designer
  • Wide Operating Input Voltage Range:
    3 V to 20 V
  • Ultra-Low Output Noise: 5 µVRMS
    (10 Hz to 100 kHz)
  • High PSRR: 90 dB at 10 kHz, 60 dB at 100 kHz
  • ±1% Output Voltage Initial Accuracy (TJ = 25°C)
  • Very Low Dropout: 200 mV (Typical) at 800 mA
  • Stable with Ceramic or Tantalum Output Capacitors
  • Excellent Line and Load Transient Response
  • Current Limit and Overtemperature Protection
  • Create a Custom Design Using the LP38798 With the WEBENCH Power Designer

The LP38798-ADJ is a high-performance, low-noise LDO that can supply up to 800 mA output current. Designed to meet the requirements of sensitive RF/Analog circuitry, the LP38798-ADJ implements a novel linear topology on an advanced CMOS process to deliver ultra-low output noise and high PSRR at switching power supply frequencies. The LP38798SD-ADJ is stable with both ceramic and tantalum output capacitors and requires a minimum output capacitance of only 1 µF for stability.

The LP38798-ADJ can operate over a wide input voltage range (3 V to 20 V) making it well suited for many post-regulation applications.

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

The LP38798-ADJ is a high-performance, low-noise LDO that can supply up to 800 mA output current. Designed to meet the requirements of sensitive RF/Analog circuitry, the LP38798-ADJ implements a novel linear topology on an advanced CMOS process to deliver ultra-low output noise and high PSRR at switching power supply frequencies. The LP38798SD-ADJ is stable with both ceramic and tantalum output capacitors and requires a minimum output capacitance of only 1 µF for stability.

The LP38798-ADJ can operate over a wide input voltage range (3 V to 20 V) making it well suited for many post-regulation applications.

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

Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Same functionality with different pin-out to the compared device
TPS7A33 ACTIVE 1-A, high-PSRR, negative, adjustable low-dropout voltage regulator with enable This is a negative voltage (–36 V), lower noise (16-µVRMS), 1-A LDO
TPS7A47 ACTIVE 1-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable This is a lower noise (4-µVRMS), 1-A LDO

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 5
Type Title Date
* Data sheet LP38798 800-mA Ultra-Low-Noise, High-PSRR LDO datasheet (Rev. F) PDF | HTML 24 Jan 2017
Application note A Topical Index of TI LDO Application Notes (Rev. F) 27 Jun 2019
Selection guide Low Dropout Regulators Quick Reference Guide (Rev. P) 21 Mar 2018
Technical article Decrease power consumption with an LDO PDF | HTML 19 Jul 2016
EVM User's guide LP38798EVM User's Guide 26 Mar 2013

Design & development

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

Evaluation board

AFE2256EVM — AFE2256 256-channel AFE for digital X-ray flat-panel detectors evaluation module

The AFE2256EVM is a compact USB based evaluation kit for evaluating the AFE2256 COF, a 256-channel analog front-end. The EVM is self-contained with DACs and power generation on-board which greatly reduces its dependency on external equipment. The kit consists of an EVM and two separate COF adapters (...)

User guide: PDF
Evaluation board

LMK5B33216EVM — LMK5B33216 evaluation module for 16-output, three DPLL and APLL, network synchronizer with BAW VCO

The LMK5B33216 evaluation module (EVM) is a platform for developing the LMK5B33216 network clock generator and synchronizer. The EVM can be used for device evaluation, compliance testing and system prototyping.

LMK5B33216EVM integrates three analog phase-locked loops (APLLs) and three digital PLLs (...)

User guide: PDF | HTML
Not available on TI.com
Evaluation board

LMK5B33414EVM — LMK5B33414 evaluation module for 14-output, three DPLL and APLL, network synchronizer with BAW VCO

The LMK5B33414 evaluation module (EVM) is a platform for device evaluation, compliance testing, and system prototyping for the LMK5B33414 network clock generator and synchronizer.

LMK5B33414 integrates three analog phase-locked loops (APLLs) and three digital PLLs (DPLLs) with programmable-loop (...)

User guide: PDF | HTML
Not available on TI.com
Evaluation board

LP38798EVM — LP38798 Linear Regulator Evaluation Module

The LP38798-ADJ is a high performance linear regulator capable of supplying 800 mA output current. Designed to meet the requirements of sensitive RF/Analog circuitry, the LP38798-ADJ implements a novel linear topology on an advanced CMOS process to deliver ultra-low output noise and high PSRR at (...)
User guide: PDF
Not available on TI.com
Evaluation board

REF6025EVM-PDK — REF6025 voltage reference evaluation module

The REF6025EVM-PDK is a platform for evaluating the performance of the REF6025 voltage reference. The evaluation kit brings out the burst mode performance of the device which is a key feature of the device.
User guide: PDF
Not available on TI.com
Simulation model

LP38798 PSpice Transient Model

SNOM471.ZIP (20 KB) - PSpice Model
Simulation model

LP38798 Unencrypted PSpice Transient Model

SNOM559.ZIP (1 KB) - PSpice Model
Reference designs

TIDA-00080 — Isolated delta-sigma modulator based AC/DC voltage and current measurement module reference design

This isolated shunt based current measurement unit enables high accuracy current measurement without the use of Current Transformers (CT). The isolation is achieved through the use of AMC1304 that incorporates both high voltage isolation as well as the Delta-Sigma Modulator. This solution (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00533 — Rail Cleaner With Adjustable Output Voltage Drop and Soft-start Capabilities Reference Design

The TIDA-00533 reference design features a post regulation voltage follower and rail cleaner for noise sensitive applications; provides a high efficiency by operating at the voltage dropout level. This design also offers functional and safety features which make it more beneficial than a discrete (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00626 — 9.8GHz RF CW Signal Generator Using Integrated Synthesizer With Spur Reduction Reference Design

This design is a 9.8-GHz wideband, low-phase noise, integrated continuous wave (CW) RF signal generator with versatile spur reduction technique. The output level can be programmed from -32 dBm to 14.5 dBm in 0.5-dB steps. This signal generator can be used as local oscillator for applications, such (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00171 — Isolated Current Shunt and Voltage Measurement Reference Design for Motor Drives

This evaluation kit and reference design implements the AMC130x reinforced isolated delta-sigma modulators along with integrated Sinc filters in the C2000™ TMS320F28377D Delfino™ microcontroller. The design provides an ability to evaluate the  performance of these measurements: three motor (...)
User guide: PDF
Schematic: PDF
Reference designs

TIDA-00886 — Low Power RF PLL-Synthesizer Operating From a Single Cell Battery Reference Design

The TIDA-00886 consists of the LMX2571,  high-performance, wideband PLLatinum™ low-power RF synthesizer, powered by a single cell battery using TPS63050 a DC-DC buck-boost converter.  The TIDA-00886 shows that the DC-DC buck-boost converter has a small to negligible effect on (...)
Design guide: PDF
Schematic: PDF
Package Pins Download
WSON (DNT) 12 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

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