SBVS313 June 2017 TPS7A85A


  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. 6.6Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
      1. 7.3.1Voltage Regulation Features
        1. Regulation
        2. and Transient Response
      2. 7.3.2System Start-Up Features
        1. Soft Start (NR/SS)
        2. Sequencing
          1. (EN)
          2. Lockout (UVLO) Control
          3. Discharge
        3. Output (PG)
      3. 7.3.3Internal Protection Features
        1. Current Limit (ICL)
        2. Protection (Tsd)
    4. 7.4Device Functional Modes
      1. 7.4.1Regulation
      2. 7.4.2Disabled
  8. Application and Implementation
    1. 8.1Application Information
      1. 8.1.1External Component Selection
        1. Operation
        2. Programmable Output Voltage
        3. Operation
        4. ANY-OUT Resolution for LILO Conditions
        5. Sharing
        6. Capacitor Types
        7. and Output Capacitor Requirements (CIN and COUT)
        8. Capacitor (CFF)
        9. and Soft-Start Capacitor (CNR/SS)
      2. 8.1.2Start-Up
        1. Soft-Start Control (NR/SS)
          1. Current
        2. Lockout (UVLO)
        3. (PG) Function
      3. 8.1.3AC and Transient Performance
        1. Power-Supply Rejection Ratio (PSRR)
        2. Voltage Noise
        3. Noise and PSRR
          1. Pump Noise
        4. Load Transient Response
      4. 8.1.4DC Performance
        1. Voltage Accuracy (VOUT)
        2. Dropout Voltage (VDO)
          1. When Transitioning From Dropout Into Regulation
      5. 8.1.5Sequencing Requirements
      6. 8.1.6Negatively Biased Output
      7. 8.1.7Reverse Current
      8. 8.1.8Power Dissipation (PD)
        1. Junction Temperature
        2. Area for Continuous Operation (RACO)
    2. 8.2Typical Applications
      1. 8.2.1Low-Input, Low-Output (LILO) Voltage Conditions
        1. Requirements
        2. Design Procedure
        3. Curves
  9. Power-Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Example

Package Options

Mechanical Data (Package|Pins)
Orderable Information


  • Low Dropout: 150 mV (Typical) at 4 A
  • 0.75% (Maximum) Accuracy Over Line, Load, and Temperature With BIAS
  • Output Voltage Noise:
    • 4.4 μVRMS at 0.8-V Output
    • 7.7 μVRMS at 5.1-V Output
  • Input Voltage Range:
    • Without BIAS: 1.4 V to 6.5 V
    • With BIAS: 1.1 V to 6.5 V
  • ANY-OUT™ Operation:
    • Output Voltage Range: 0.8 V to 3.95 V
  • Adjustable Operation:
    • Output Voltage Range: 0.8 V to 5.1 V
  • Power-Supply Ripple Rejection:
    • 40 dB at 500 kHz
  • Excellent Load Transient Response
  • Adjustable Soft-Start In-Rush Control
  • Open-Drain Power-Good (PG) Output
  • Stable with a 47-μF or Larger Ceramic Output Capacitor
  • θJC = 3.4°C/W
  • 3.5-mm × 3.5-mm, 20-Pin VQFN


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


The TPS7A85A is a low-noise (4.4 μVRMS), low dropout linear regulator (LDO) capable of sourcing 4 A with only 240 mV of maximum dropout. The device output voltage is pin-programmable from 0.8 V to 3.95 V and adjustable from 0.8 V to 5.1 V using an external resistor divider.

The combination of low-noise (4.4 μVRMS), high- PSRR, and high output current capability makes the TPS7A85A ideal to power noise-sensitive components such as those found in high-speed communications, video, medical, or test and measurement applications. The high performance of the TPS7A85A limits power-supply-generated phase noise and clock jitter, making this device ideal for powering high-performance serializer and deserializer (SerDes), analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and RF components. Specifically, RF amplifiers benefit from the high-performance and 5.1-V output capability of the device.

For digital loads (such as application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), and digital signal processors (DSPs)) requiring low-input voltage, low-output (LILO) voltage operation, the exceptional accuracy (0.75% over load and temperature), remote sensing, excellent transient performance, and soft-start capabilities of the TPS7A85A ensure optimal system performance.

The versatility of the TPS7A8500A makes the device a component of choice for many demanding applications.

Device Information(1)

TPS7A85AVQFN (20)3.50 mm × 3.50 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Powering RF Components

TPS7A85A Front_AL_SBVS313.gif

Powering Digital Loads

TPS7A85A Typ_app_sch_sbvs313.gif