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Linear & low-dropout (LDO) regulators

TPS7A94

ACTIVE

1-A, ultra-low noise, ultra-high PSRR, RF voltage regulator

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Data sheet

TPS7A94

ACTIVE
Data sheet Order now

Product details

Output options Adjustable Output Iout (max) (A) 1 Vin (max) (V) 5.7 Vin (min) (V) 1.7 Vout (max) (V) 5.5 Vout (min) (V) 0 Noise (µVrms) 0.46 Iq (typ) (mA) 15 Thermal resistance θJA (°C/W) 46.9 Rating Catalog Load capacitance (min) (µF) 4.7 Regulated outputs (#) 1 Features Adjustable current limit, Enable, Foldback Overcurrent protection, Output discharge, Power good, Soft start Accuracy (%) 1 PSRR at 100 KHz (dB) 78 Dropout voltage (Vdo) (typ) (mV) 150 Operating temperature range (°C) -40 to 125
Output options Adjustable Output Iout (max) (A) 1 Vin (max) (V) 5.7 Vin (min) (V) 1.7 Vout (max) (V) 5.5 Vout (min) (V) 0 Noise (µVrms) 0.46 Iq (typ) (mA) 15 Thermal resistance θJA (°C/W) 46.9 Rating Catalog Load capacitance (min) (µF) 4.7 Regulated outputs (#) 1 Features Adjustable current limit, Enable, Foldback Overcurrent protection, Output discharge, Power good, Soft start Accuracy (%) 1 PSRR at 100 KHz (dB) 78 Dropout voltage (Vdo) (typ) (mV) 150 Operating temperature range (°C) -40 to 125
WSON (DSC) 10 9 mm² 3 x 3
  • Ultra-low output noise:
    • 0.46 µV RMS (typ, 10 Hz to 100 kHz)
  • High power-supply ripple rejection (PSRR):
    • 102 dB at 100Hz
    • 110 dB at 1 kHz
    • 95 dB at 10 kHz
    • 78 dB at 100 kHz
    • 50 dB at 1 MHz
  • Accuracy over line, load, and temperature: 1%
  • Low dropout: 150 mV at 1 A
  • Wide input voltage range: 1.7 V to 5.7 V
  • Wide output voltage range: 0 V to 5.5 V
  • Parallelable for lower noise and higher current
  • Fast transient response
  • Precision enable and UVLO
  • Programmable current limit
  • Programmable PG threshold
  • Adjustable start-up inrush control
  • Open-drain, power-good (PG) output
  • Package: 3.00-mm × 3.00-mm, 10-pin WSON:
    • JEDEC R θJA: 46.1°C/W
    • EVM R θJA: 25.6°C/W
  • Ultra-low output noise:
    • 0.46 µV RMS (typ, 10 Hz to 100 kHz)
  • High power-supply ripple rejection (PSRR):
    • 102 dB at 100Hz
    • 110 dB at 1 kHz
    • 95 dB at 10 kHz
    • 78 dB at 100 kHz
    • 50 dB at 1 MHz
  • Accuracy over line, load, and temperature: 1%
  • Low dropout: 150 mV at 1 A
  • Wide input voltage range: 1.7 V to 5.7 V
  • Wide output voltage range: 0 V to 5.5 V
  • Parallelable for lower noise and higher current
  • Fast transient response
  • Precision enable and UVLO
  • Programmable current limit
  • Programmable PG threshold
  • Adjustable start-up inrush control
  • Open-drain, power-good (PG) output
  • Package: 3.00-mm × 3.00-mm, 10-pin WSON:
    • JEDEC R θJA: 46.1°C/W
    • EVM R θJA: 25.6°C/W

The TPS7A94 is an ultra-low-noise (0.46 µV RMS), low-dropout (LDO) voltage regulator capable of sourcing 1 A with only 150 mV of dropout. The low dropout, in conjunction with a wide bandwidth error amplifier, allows for very high PSRR (110 dB at 1 kHz and 50 dB at 1 MHz) under low operating headroom (500 mV) and high output current (750 mA).

The device output is adjustable from 0 V to 5.5 V with an external resistor. With the wide input voltage range, the device supports operation as low as 1.7 V and up to 5.7 V. The device includes programmable current limit, programmable PG threshold, and precision enable, allowing better control in the application.

With the high-accuracy reference and wide-bandwidth topology, the device can be easily paralleled to achieve lower noise and higher current.

With 1% output voltage accuracy (over line, load, and temperature) and soft-start capabilities to reduce inrush current, the device is an excellent choice for powering sensitive analog low-voltage devices.

The TPS7A94 is an ultra-low-noise (0.46 µV RMS), low-dropout (LDO) voltage regulator capable of sourcing 1 A with only 150 mV of dropout. The low dropout, in conjunction with a wide bandwidth error amplifier, allows for very high PSRR (110 dB at 1 kHz and 50 dB at 1 MHz) under low operating headroom (500 mV) and high output current (750 mA).

The device output is adjustable from 0 V to 5.5 V with an external resistor. With the wide input voltage range, the device supports operation as low as 1.7 V and up to 5.7 V. The device includes programmable current limit, programmable PG threshold, and precision enable, allowing better control in the application.

With the high-accuracy reference and wide-bandwidth topology, the device can be easily paralleled to achieve lower noise and higher current.

With 1% output voltage accuracy (over line, load, and temperature) and soft-start capabilities to reduce inrush current, the device is an excellent choice for powering sensitive analog low-voltage devices.
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Technical documentation

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* Data sheet TPS7A94 1-A, Ultra-Low Noise, Ultra-High PSRR, Low-Dropout Regulator datasheet (Rev. C) PDF | HTML 15 Jun 2023
Technical article 如何以低雜訊和低漣波設計技術強化電源與訊號完整性 PDF | HTML 04 Oct 2024
Technical article 저잡음 및 저리플 설계 기술로 전력 및 신호 무결성을 향상시키는 방법 PDF | HTML 04 Oct 2024
Technical article How to enhance power and signal integrity with low noise and low ripple design techniques PDF | HTML 25 Sep 2024
Circuit design Voltage Margining and Scaling Circuit with a Voltage Output Smart DAC (Rev. A) PDF | HTML 17 Apr 2024
Circuit design Voltage Margining and Scaling Circuit With Current Output Smart DAC (Rev. A) PDF | HTML 16 Apr 2024
White paper Simplifying Power Conversion in High-Voltage Systems PDF | HTML 09 Nov 2023
White paper Simplifying Power Architectures With Low-Noise Power Devices PDF | HTML 07 Nov 2023
Product overview 1µV Ultra-Low Noise 12 Vin 3.3 Vout 1-A Power Supply PDF | HTML 03 Jul 2023
White paper Parallel LDO Architecture Design Using Ballast Resistors PDF | HTML 14 Dec 2022
White paper Comprehensive Analysis and Universal Equations for Parallel LDO's Using Ballast PDF | HTML 13 Dec 2022
User guide TPS7A94EVM-046 Evaluation Module (Rev. B) PDF | HTML 04 Aug 2022
Technical article LDO basics: noise – how a noise-reduction pin improves system performance PDF | HTML 14 Jun 2017

Design & development

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

Evaluation board

LMX2594PSEVM — LMX2594 evaluation module for 15-GHz RF synthesizer with multiple-device phase synchronization

The LMX2594 evaluation module (EVM) is a platform for evaluating the phase-synchronization (PS) feature of the LMX2594 wideband RF synthesizer. LMX2594PSEVM contains two LMX2594 parts that share the same reference clock.

After phase synchronization, the phase of the parts' outputs can be (...)

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

TPS7A94EVM-046 — TPS7A94 evaluation module for 1-A, ultra-low noise, ultra-high PSRR, RF voltage regulator

The TPS7A94 evaluation module (EVM) helps design engineers evaluate the operation and performance of the TPS7A94 linear regulator for use in their own circuit application. This EVM configuration contains a single low-noise, small-size, linear regulator for a wide range of applications.

The regulator (...)

User guide: PDF | HTML
Not available on TI.com
Simulation model

TPS7A94 PSpice Transient Model (1-A Current Limit)

SBVM988.ZIP (67 KB) - PSpice Model
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Simulation model

TPS7A94 PSpice Transient Model (600-mA Current Limit)

SBVM986.ZIP (66 KB) - PSpice Model
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Simulation model

TPS7A94 PSpice Transient Model (800-mA Current Limit)

SBVM987.ZIP (68 KB) - PSpice Model
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Calculation tool

PARALLEL-LDO-CALC — Parallel low-dropout (LDO) calculator

The parallel low-dropout (LDO) calculator is a Microsoft® Excel®-based tool that provides worst-case analysis for parallel LDO regulators using ballast resistors. The tool helps the user identify the minimum number of parallel LDO regulators required and optimum ballast resistance for a (...)

Supported products & hardware

Supported products & hardware

Products
Linear & low-dropout (LDO) regulators
TPS7A33 — 1-A, high-PSRR, negative, adjustable low-dropout voltage regulator with enable TPS7A47 — 1-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable TPS7A47-Q1 — Automotive 1-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable TPS7A4701-EP — Enhanced product, 36-V, 1-A, 4-μVRMS, RF LDO voltage regular TPS7A52 — 2-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout (LDO) voltage regulator TPS7A52-Q1 — Automotive 2-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout (LDO) voltage regulator TPS7A53 — 3-A, low-VIN (1.1 V) low-noise high-accuracy ultra-low-dropout (LDO) voltage regulator TPS7A53-Q1 — Automotive, 3-A, low-VIN (1.1 V) low-noise high-accuracy ultra-low-dropout (LDO) voltage regulator TPS7A53A-Q1 — Automotive, 3-A, low-VIN 5.6-µVRMS low-noise high-accuracy ultra-low dropout voltage regulator TPS7A53B — 3-A, 1.1-V, low-VIN, low-noise high-accuracy ultra-low-dropout voltage regulator with 0.5-V low VREF TPS7A54 — 4-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout (LDO) voltage regulator TPS7A54-Q1 — Automotive 4-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout (LDO) voltage regulator TPS7A57 — 5-A, low-input-voltage, low-noise, high-accuracy low-dropout (LDO) voltage regulator TPS7A83A — 2-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout voltage regulator with power good TPS7A84A — 3-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout voltage regulator with power good TPS7A85A — 4-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout voltage regulator with power good TPS7A94 — 1-A, ultra-low noise, ultra-high PSRR, RF voltage regulator TPS7B7702-Q1 — Automotive 300-mA, off-battery (40-V), dual-channel adjustable antenna low-dropout voltage regulator TPS7A8300 — 2-A, low-VIN, low-2-A, low-VIN, low-noise, ultra-low-dropout voltage regulator with power good wi TPS7A84 — 3-A, low-VIN, low-noise, ultra-low-dropout voltage regulator with power good with high-accuracy TPS7A85 — 4-A, low-VIN, low-noise, ultra-low-dropout voltage regulator with power good with high-accuracy TPS7A96 — 2-A, ultra-low noise ultra-high PSRR RF voltage regulator TPS7A4501-SP — Radiation-hardened, QMLV, 1.5-V to 20-V input 1.5-A low-dropout (LDO) regulator TPS7H1111-SP — Radiation-hardened, QMLV and QMLP, 1.5A ultra-low-noise high-PSRR low-dropout (LDO) regulator TPS7H1111-SEP — Radiation-tolerant, 1.5A, ultra-low-noise ultra-high-PSRR RF LDO regulator
Hardware development
Evaluation board
TPS7A57EVM-081 — TPS7A57 evaluation module for 5-A low-noise high-accuracy low-dropout (LDO) voltage regulator
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WSON (DSC) 10 Ultra Librarian
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