SBVS263A July 2017  – September 2017 TPS7A39

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics
    6. 6.6Startup Characteristics
    7. 6.7Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
      1. 7.3.1Voltage Regulation
        1. 7.3.1.1DC Regulation
        2. 7.3.1.2AC and Transient Response
      2. 7.3.2User-Settable Buffered Reference
      3. 7.3.3Active Discharge
      4. 7.3.4System Start-Up Controls
        1. 7.3.4.1Start-Up Tracking
        2. 7.3.4.2Sequencing
          1. 7.3.4.2.1Enable (EN)
          2. 7.3.4.2.2Undervoltage Lockout (UVLO) Control
    4. 7.4Device Functional Modes
      1. 7.4.1Normal Operation
      2. 7.4.2Dropout Operation
      3. 7.4.3Disabled
  8. Application and Implementation
    1. 8.1Application Information
      1. 8.1.1 Setting the Output Voltages on Adjustable Devices
      2. 8.1.2 Capacitor Recommendations
      3. 8.1.3 Input and Output Capacitor (CINx and COUTx)
      4. 8.1.4 Feed-Forward Capacitor (CFFx)
      5. 8.1.5 Noise-Reduction and Soft-Start Capacitor (CNR/SS)
      6. 8.1.6 Buffered Reference Voltage
      7. 8.1.7 Overriding Internal Reference
      8. 8.1.8 Start-Up
        1. 8.1.8.1Soft-Start Control (NR/SS)
          1. 8.1.8.1.1In-Rush Current
        2. 8.1.8.2Undervoltage Lockout (UVLOx) Control
      9. 8.1.9 AC and Transient Performance
        1. 8.1.9.1 Power-Supply Rejection Ratio (PSRR)
        2. 8.1.9.2Channel-to-Channel Output Isolation and Crosstalk
        3. 8.1.9.3Output Voltage Noise
        4. 8.1.9.4Optimizing Noise and PSRR
        5. 8.1.9.5 Load Transient Response
      10. 8.1.10DC Performance
        1. 8.1.10.1Output Voltage Accuracy (VOUTx)
        2. 8.1.10.2 Dropout Voltage (VDO)
      11. 8.1.11Reverse Current
      12. 8.1.12Power Dissipation (PD)
        1. 8.1.12.1Estimating Junction Temperature
    2. 8.2Typical Applications
      1. 8.2.1Design 1: Single-Ended to Differential Isolated Supply
        1. 8.2.1.1Design Requirements
        2. 8.2.1.2Detailed Design Procedure
          1. 8.2.1.2.1Switcher Choice
          2. 8.2.1.2.2Full Bridge Rectifier With Center-Tapped Transformer
          3. 8.2.1.2.3Total Solution Efficiency
          4. 8.2.1.2.4Feedback Resistor Selection
        3. 8.2.1.3Application Curves
      2. 8.2.2Design 2: Getting the Full Range of a SAR ADC
        1. 8.2.2.1Design Requirements
        2. 8.2.2.2Detailed Design Procedure
        3. 8.2.2.3Detailed Design Description
          1. 8.2.2.3.1Regulation of -0.2 V
          2. 8.2.2.3.2Feedback Resistor Selection
        4. 8.2.2.4Application Curves
  9. Power-Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
      1. 10.1.1Board Layout Recommendations to Improve PSRR and Noise Performance
    2. 10.2Layout Example
    3. 10.3Package Mounting
  11. 11Device and Documentation Support
    1. 11.1Device Support
      1. 11.1.1Development Support
        1. 11.1.1.1Evaluation Modules
        2. 11.1.1.2Spice Models
    2. 11.2Documentation Support
      1. 11.2.1Related Documentation
    3. 11.3Receiving Notification of Documentation Updates
    4. 11.4Community Resources
    5. 11.5Trademarks
    6. 11.6Electrostatic Discharge Caution
    7. 11.7Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Features

  • Positive and Negative LDOs in One Package
  • Wide Input Voltage Range: ±3.3 V to ±33 V
  • Wide Output Voltage Range:
    • Positive Range: 1.2 V to 30 V
    • Negative Range: –30 V to 0 V
  • Output Current: 150 mA per Channel
  • Monotonic Start-Up Tracking
  • High Power-Supply Rejection Ratio (PSRR):
    • 69 dB (120 Hz)
    • ≥ 50 dB (10 Hz to 2 MHz)
  • Output Voltage Noise: 21 µVRMS (10 Hz–100 kHz)
  • Buffered 1.2-V Reference Output
  • Stable With a 10-µF or Larger Output Capacitor
  • Single Positive-Logic Enable
  • Adjustable Soft-Start In-Rush Control
  • 3-mm × 3-mm, 10-Pin WSON Package
  • Low Thermal Resistance: RθJA = 44.4°C/W
  • Operating Temperature Range: –40 to +125°C

Applications

  • Supply Rails for Op Amps, ADCs, DACs, and Other High-Precision Analog Circuitry
  • Post DC-DC Regulation and Filtering
  • Analog I/O Modules
  • Test and Measurement
  • Rx, Tx, and PA Circuitry
  • Industrial Instrumentation
  • Medical Imaging

Description

The TPS7A39 device is a dual, monolithic, high-PSRR, positive and negative low-dropout (LDO) voltage regulator capable of sourcing (and sinking) up to 150 mA of current. The regulated outputs can be independently and externally adjusted to symmetrical or asymmetrical voltages, making this device an ideal dual, bipolar power supply for signal conditioning.

Both positive and negative outputs of the TPS7A39 ratiometrically track each other during startup to mitigate floating conditions and other power-supply sequencing issues common in dual-rail systems. The negative output can regulate up to 0 V, extending the common-mode range for single-supply amplifiers. The TPS7A39 also features high PSRR to eliminate power-supply noise, such as switching noise, that can compromise signal integrity.

Both regulators are controlled with a single positive logic enable pin for interfacing with standard digital logic. A capacitor-programmable soft-start function controls in-rush current and start-up time. The internal reference voltage of the TPS7A39 can be overridden with an external reference to enable precision outputs, output voltage margining, or to track other power supplies. Additionally, the TPS7A39 has a buffered reference output that can be used as a voltage reference for other components in the system.

These features make the TPS7A39 a robust, simplified solution to power operational amplifiers, digital-to-analog converters (DACs), and other precision analog circuitry.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
TPS7A39WSON (10)3.00 mm × 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Powering the Signal Chain

TPS7A39 Front_Page_F.gif

Monotonic Start-Up Tracking

TPS7A39 tc_enable_startup.gif