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LP38798

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

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

LP38798

ACTIVE
Data sheet Order now

Product details

Parameters

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 (uVrms) 5 Iq (Typ) (mA) 1.4 Thermal resistance θJA (°C/W) 35 Load capacitance (Min) (µF) 1 Rating Catalog Regulated outputs (#) 1 Features Enable Accuracy (%) 2 PSRR @ 100 KHz (dB) 65 Dropout voltage (Vdo) (Typ) (mV) 200 Operating temperature range (C) -40 to 125 open-in-new Find other Linear regulators (LDO)

Package | Pins | Size

WSON (DNT) 12 16 mm² 4 x 4 open-in-new Find other Linear regulators (LDO)

Features

  • 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
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Description

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.

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Same functionality but is not pin-for-pin or parametrically equivalent 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

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet LP38798 800-mA Ultra-Low-Noise, High-PSRR LDO datasheet (Rev. F) Jan. 24, 2017
Application note A Topical Index of TI LDO Application Notes (Rev. F) Jun. 27, 2019
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
Selection guide Low Dropout Regulators Quick Reference Guide (Rev. P) Mar. 21, 2018
Technical articles LDO basics: noise – part 1 Jun. 14, 2017
User guide LP38798EVM User's Guide Mar. 26, 2013

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
899
Description

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 (...)

Features
  • Allows quick evaluation of AFE2256 COF devices (externally detachable)
  • GUI software allows easy control of AFE2256 device modes and functions
  • On board 3.3V and 1.8V DUT power generation
  • On board FPGA based pattern generation and data acquisition
  • Communicates with Personal Computer through a USB 2.0 (...)
View details
EVALUATION BOARD Download
document-generic User guide
49
Description
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 (...)
Features
  • Ultra-Low Output Noise: 5 µVRMS (10Hz to 100kHz)
  • High PSRR: 90dB at 10 kHz, 60dB at 100 kHz
  • Maximum Operating Input Voltage: 20.0V
  • Maximum Operating Output Current: 800mA
View details
EVALUATION BOARD Download
document-generic User guide
149
Description
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.
Features
  • TI’s first ultra-high precision reference
  • Introduces ADC drive buffer which is an integrated high bandwidth, output impedance buffer that helps achieve the lowest distortion, ultra-low-noise data acquisition systems
  • Introduces burst mode data acquisition with first-sample correct to 18-bit (...)
View details

Design tools & simulation

SIMULATION MODEL Download
SNOM471.ZIP (20 KB) - PSpice Model
SIMULATION MODEL Download
SNOM559.ZIP (1 KB) - PSpice Model

Reference designs

REFERENCE DESIGNS Download
Isolated Current Shunt and Voltage Measurement Reference Design for Motor Drives
TIDA-00171 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Isolated delta-sigma modulator based AC/DC voltage and current measurement module reference design
TIDA-00080 — 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 eliminates (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
9.8GHz RF CW Signal Generator Using Integrated Synthesizer With Spur Reduction Reference Design
TIDA-00626 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Low Power RF PLL-Synthesizer Operating From a Single Cell Battery Reference Design
TIDA-00886 — 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Rail Cleaner With Adjustable Output Voltage Drop and Soft-start Capabilities Reference Design
TIDA-00533 — 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 (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
WSON (DNT) 12 View options

Ordering & quality

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