SBVS248A November   2015  – November 2015 TPS7A88

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Independent Dual-Channel LDO
      2. 7.3.2 Output Enable
      3. 7.3.3 Dropout Voltage (VDO)
      4. 7.3.4 Output Voltage Accuracy
      5. 7.3.5 Low Output Noise
      6. 7.3.6 Internal Protection Circuitry
        1. 7.3.6.1 Undervoltage Lockout (UVLO)
        2. 7.3.6.2 Internal Current Limit (ICL)
        3. 7.3.6.3 Thermal Protection
      7. 7.3.7 Output Soft-Start Control
      8. 7.3.8 Power-Good Function
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Operation
      2. 7.4.2 Dropout Operation
      3. 7.4.3 Disabled
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Adjustable Outputs
      2. 8.1.2 Start-Up
        1. 8.1.2.1 Enable (ENx) and Undervoltage Lockout (UVLO)
        2. 8.1.2.2 Noise-Reduction and Soft-Start Capacitor (CNR/SSx)
        3. 8.1.2.3 Soft-Start and Inrush Current
      3. 8.1.3 Capacitor Recommendation
        1. 8.1.3.1 Input and Output Capacitor Requirements (CINx and COUTx)
        2. 8.1.3.2 Feed-Forward Capacitor (CFFx)
      4. 8.1.4 AC Performance
        1. 8.1.4.1 Power-Supply Ripple Rejection (PSRR)
        2. 8.1.4.2 Channel-to-Channel Output Isolation and Crosstalk
        3. 8.1.4.3 Load-Step Transient Response
        4. 8.1.4.4 Noise
      5. 8.1.5 Power Dissipation (PD)
      6. 8.1.6 Estimating Junction Temperature
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Do's and Don'ts
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Board Layout
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 Evaluation Modules
        2. 11.1.1.2 Spice Models
      2. 11.1.2 Device Nomenclature
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • Two Independent LDO Channels
  • Low Output Noise: < 3.8 µVRMS (10 Hz–100 kHz)
  • Low Dropout: 200 mV (Max) at 1 A
  • Wide Input Voltage Range: 1.4 V to 6.5 V
  • Wide Output Voltage Range: 0.8 V to 5.0 V
  • High Power-Supply Ripple Rejection:
    • 75 dB at DC
    • 40 dB at 100 kHz
    • 40 dB at 1 MHz
  • 1.0% Accuracy Over Line, Load, and Temperature
  • Excellent Load Transient Response
  • Adjustable Start-Up In-Rush Control
  • Selectable Soft-Start Charging Current
  • Independent Open-Drain Power-Good (PG) Outputs
  • Stable with a 10-µF or Larger Ceramic Output Capacitor
  • 4-mm × 4-mm, 20-Pin WQFN Package

2 Applications

  • High-Speed Analog Circuits:
    • VCO, ADC, DAC, LVDS
  • Imaging: CMOS Sensors, Video ASICs
  • Test and Measurement
  • Instrumentation, Medical, and Audio
  • Digital Loads: SerDes, FPGA, DSP™

3 Description

The TPS7A88 is a dual, low-noise (3.8 µVRMS), low-dropout (LDO) voltage regulator capable of sourcing 1 A per channel with only 200 mV of maximum dropout.

The TPS7A88 provides the flexibility of two independent LDOs and approximately 50% smaller solution size than two single-channel LDOs. Each output is adjustable with external resistors from 0.8 V to 5.0 V. The TPS7A88 wide input-voltage range supports operation as low as 1.4 V and up to 6.5 V.

With 1% output voltage accuracy (over line, load, and temperature) and soft-start capabilities to reduce in-rush current, the TPS7A88 is ideal for powering sensitive analog low-voltage devices [such as voltage-controlled oscillators (VCOs), analog-to-digital converters (ADCs), digital-to-analog converters (DACs), high-end processors, and field-programmable gate arrays (FPGAs)].

The TPS7A88 is designed to power up noise-sensitive components such as those found in high-speed communication, video, medical, or test and measurement applications. The very low 4-µVRMS output noise and wideband PSRR (40 dB at 1 MHz) minimizes phase noise and clock jitter. These features maximize performance of clocking devices, ADCs, and DACs.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPS7A88 WQFN (20) 4.00 mm × 4.00 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Typical Application Diagram

TPS7A88 app_diag_sbvs248.gif