Product details

Output options Adjustable Output, Fixed Output Iout (Max) (A) 0.25 Vin (Max) (V) 5.5 Vin (Min) (V) 2.7 Vout (Max) (V) 5.4 Vout (Min) (V) 1.22 Fixed output options (V) 1.8, 2.5, 2.8, 3, 3.3 Noise (uVrms) 32 Iq (Typ) (mA) 0.17 Thermal resistance θJA (°C/W) 53 Rating Catalog Load capacitance (Min) (µF) 2.2 Regulated outputs (#) 1 Features Enable Accuracy (%) 3 PSRR @ 100 KHz (dB) 38 Dropout voltage (Vdo) (Typ) (mV) 155 Operating temperature range (C) -40 to 85
Output options Adjustable Output, Fixed Output Iout (Max) (A) 0.25 Vin (Max) (V) 5.5 Vin (Min) (V) 2.7 Vout (Max) (V) 5.4 Vout (Min) (V) 1.22 Fixed output options (V) 1.8, 2.5, 2.8, 3, 3.3 Noise (uVrms) 32 Iq (Typ) (mA) 0.17 Thermal resistance θJA (°C/W) 53 Rating Catalog Load capacitance (Min) (µF) 2.2 Regulated outputs (#) 1 Features Enable Accuracy (%) 3 PSRR @ 100 KHz (dB) 38 Dropout voltage (Vdo) (Typ) (mV) 155 Operating temperature range (C) -40 to 85
HVSSOP (DGN) 8 9 mm² 3 x 3 SOT-223 (DCQ) 6 46 mm² 6.5 x 7.06
  • 250-mA Low-Dropout Regulator With Enable
  • Available in Fixed and Adjustable (1.2 V to
    5.5 V) Versions
  • High PSRR (60 dB at 10 kHz)
  • Ultralow Noise (32 µVrms, TPS79428)
  • Fast Start-Up Time (50 µs)
  • Stable With a 2.2-µF Ceramic Capacitor
  • Excellent Load/Line Transient Response
  • Very Low Dropout Voltage (155 mV at Full Load)
  • Available in MSOP-8 and SOT223-6 Packages
  • APPLICATIONS
    • RF: VCOs, Receivers, ADCs
    • Audio
    • Bluetooth™, Wireless LAN
    • Cellular and Cordless Telephones
    • Handheld Organizers, PDAs

PowerPAD is a trademark of Texas Instruments.
Bluetooth is a trademark of Bluetooth SIG, Inc.
All trademarks are the property of their respective owners.

  • 250-mA Low-Dropout Regulator With Enable
  • Available in Fixed and Adjustable (1.2 V to
    5.5 V) Versions
  • High PSRR (60 dB at 10 kHz)
  • Ultralow Noise (32 µVrms, TPS79428)
  • Fast Start-Up Time (50 µs)
  • Stable With a 2.2-µF Ceramic Capacitor
  • Excellent Load/Line Transient Response
  • Very Low Dropout Voltage (155 mV at Full Load)
  • Available in MSOP-8 and SOT223-6 Packages
  • APPLICATIONS
    • RF: VCOs, Receivers, ADCs
    • Audio
    • Bluetooth™, Wireless LAN
    • Cellular and Cordless Telephones
    • Handheld Organizers, PDAs

PowerPAD is a trademark of Texas Instruments.
Bluetooth is a trademark of Bluetooth SIG, Inc.
All trademarks are the property of their respective owners.

The TPS794xx family of low-dropout (LDO) linear voltage regulators features high power-supply rejection ratio (PSRR), ultralow-noise, fast start-up, and excellent line and load transient responses in small outline, MSOP-8 PowerPAD™ and SOT223-6 packages. Each device in the family is stable with a small 2.2-µF ceramic capacitor on the output. The family uses an advanced, proprietary BiCMOS fabrication process to yield extremely low dropout voltages (for example, 155 mV at 250 mA). Each device achieves fast start-up times (approximately 50 µs with a 0.001-µF bypass capacitor) while consuming low quiescent current (170 µA typical). Moreover, when the device is placed in standby mode, the supply current is reduced to less than µA. The TPS79428 exhibits approximately 32 µVRMS of output voltage noise at 2.8 V output with a 0.1-µF bypass capacitor. Applications with analog components that are noise-sensitive, such as portable RF electronics, benefit from the high PSRR and low noise features as well as the fast response time.

The TPS794xx family of low-dropout (LDO) linear voltage regulators features high power-supply rejection ratio (PSRR), ultralow-noise, fast start-up, and excellent line and load transient responses in small outline, MSOP-8 PowerPAD™ and SOT223-6 packages. Each device in the family is stable with a small 2.2-µF ceramic capacitor on the output. The family uses an advanced, proprietary BiCMOS fabrication process to yield extremely low dropout voltages (for example, 155 mV at 250 mA). Each device achieves fast start-up times (approximately 50 µs with a 0.001-µF bypass capacitor) while consuming low quiescent current (170 µA typical). Moreover, when the device is placed in standby mode, the supply current is reduced to less than µA. The TPS79428 exhibits approximately 32 µVRMS of output voltage noise at 2.8 V output with a 0.1-µF bypass capacitor. Applications with analog components that are noise-sensitive, such as portable RF electronics, benefit from the high PSRR and low noise features as well as the fast response time.

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Technical documentation

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Type Title Date
* Data sheet Ultralow-Noise, High-PSRR, Fast, RF, 250-mA Low-Dropout Linear Regulators datasheet (Rev. E) 03 Jan 2006
Technical article 3 quiescent-current (Iq) specifications you need to understand 12 Nov 2021
Application note LDO Noise Demystified (Rev. B) 18 Aug 2020
Application note PowerPAD™ Thermally Enhanced Package (Rev. H) 06 Jul 2018
Application note LDO PSRR Measurement Simplified (Rev. A) 09 Aug 2017
Test report TI Power Reference Design for Xilinx® Artix®-7 (AC701) 12 May 2014
User guide PMP7977 User's Guide 11 Sep 2013
Application note Using 3.3-V Signals for Spartan-3 Configuration and JTAG Ports (Rev. A) 13 Apr 2004
User guide DEM-SOT223LDO Demonstration Fixture 15 Oct 2003

Design & development

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

Evaluation board

DEM-SOT223LDO — DEM-SOT223LDO Compatible with Most Positive Output LDOs in SOT223 (DCQ) Package

The Texas Instruments DEM-SOT223LDO demonstration module (DEM) helps designers evaluate the operation and performance of Texas Instruments low-dropout regulators (LDOs).  This module is compatible with most positive output LDOs offered in the SOT223 (DCQ) package.

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Simulation model

TPS79401 PSpice Transient Model

SLVMBR6.ZIP (81 KB) - PSpice Model
Simulation model

TPS79401 Unencrypted PSpice Transient Model

SLVMBR7.ZIP (2 KB) - PSpice Model
Simulation model

TPS79433 Unencrypted PSpice Transient Model

SLVMBU3.ZIP (2 KB) - PSpice Model
Simulation model

TPS79433 PSpice Transient Model

SLVMBU4.ZIP (83 KB) - PSpice Model
Simulation model

TPS79428 PSpice Transient Model

SLVMBU5.ZIP (83 KB) - PSpice Model
Simulation model

TPS79428 Unencrypted PSpice Transient Model

SLVMBU6.ZIP (2 KB) - PSpice Model
Simulation model

TPS79430 Unencrypted PSpice Transient Model

SLVMBU7.ZIP (2 KB) - PSpice Model
Simulation model

TPS79430 PSpice Transient Model

SLVMBU8.ZIP (83 KB) - PSpice Model
Simulation model

TPS79418 PSpice Transient Model

SLVMBU9.ZIP (80 KB) - PSpice Model
Simulation model

TPS79418 Unencrypted PSpice Transient Model

SLVMBV0.ZIP (2 KB) - PSpice Model
Simulation model

TPS79425 Unencrypted PSpice Transient Model

SLVMBV1.ZIP (2 KB) - PSpice Model
Simulation model

TPS79425 PSpice Transient Model

SLVMBV2.ZIP (82 KB) - PSpice Model
PCB layout

PMP7977 PCB

TIDU151.PDF (6781 KB)
参考设计

PMP7977 — Xilinx Artix 7 FPGA with PMBus Power Management Reference Design

The Artix 7 power management reference design board uses power modules, linear regulators, and a PMBus compliant system controller to supply all required core and auxiliary voltages needed by the FPGA, including DDR memory termination. A Digital Power graphical user interface is used to monitor the (...)
Package Pins Download
HVSSOP (DGN) 8 View options
SOT-223 (DCQ) 6 View options

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