SLVSAD5A July   2010  – August 2015 TPS62120 , TPS62122

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Undervoltage Lockout
      2. 8.3.2 Enable and Shutdown
      3. 8.3.3 Power Good Output
      4. 8.3.4 SGND Open-Drain Output
      5. 8.3.5 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Soft Start
      2. 8.4.2 Main Control Loop
      3. 8.4.3 100% Duty Cycle Low-Dropout Operation
      4. 8.4.4 Short-Circuit Protection
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 TPS62120 With Open-Drain Output
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Output Voltage Setting
          2. 9.2.1.2.2 Output Filter Design (Inductor and Output Capacitor)
          3. 9.2.1.2.3 Inductor Selection
          4. 9.2.1.2.4 Output Capacitor Selection
          5. 9.2.1.2.5 Input Capacitor Selection
          6. 9.2.1.2.6 Checking Loop Stability
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Standard Circuit for TPS62122
    3. 9.3 System Examples
      1. 9.3.1 TPS62120 1.8-V Output Voltage Configuration
      2. 9.3.2 TPS62120 3.06-V Output Voltage Configuration
      3. 9.3.3 TPS62122 2.0-V Output Voltage Configuration
      4. 9.3.4 TPS62120 1.8-V VOUT Configuration Powered From a High-Impedance Source
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Examples
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Related Links
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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订购信息

1 Features

  • Wide Input Voltage Range: 2 V to 15 V
  • Up to 96% Efficiency
  • Power Save Mode With 11-µA Quiescent Current
  • Output Current 75 mA
  • Output Voltage Range: 1.2 V to 5.5 V
  • Up to 800-kHz Switch Frequency
  • Synchronous Converter, No External Rectifier
  • Low Output Ripple Voltage
  • 100% Duty Cycle for Lowest Dropout
  • Small SOT 8-Pin (TPS62120) and 2-mm × 2-mm DFN 6-Pin (TPS62122) Package
  • Internal Soft Start
  • Power Good Open Drain Output (TPS62120)
  • Open-Drain Output for Output Discharge (TPS62120)
  • 2.5-V Rising and 1.85-V Falling UVLO Thresholds

2 Applications

  • Low Power RF Applications
  • Ultra Low Power Microprocessors
  • Energy Harvesting
  • Industrial Measuring

3 Description

The TPS6212x device is a highly efficient synchronous step-down DC-DC converter optimized for low-power applications. The device supports up to 75-mA output current and allows the use of tiny external inductors and capacitors.

The wide operating input voltage range of 2 V to 15 V supports energy harvesting, battery powered and as well 9-V or 12-V line powered applications.

With its advanced hysteretic control scheme, the converter provides power save mode operation. At light loads the converter operates in pulse frequency modulation (PFM) mode and transitions automatically in pulse width modulation (PWM) mode at higher load currents. The power save mode maintains high efficiency over the entire load current range. The hysteretic control scheme is optimized for low output ripple voltage in PFM mode in order to reduce output noise to a minimum. The device consumes only 10-µA quiescent current from VIN in PFM mode operation.

In shutdown mode, the device is turned off.

An open-drain power good output is available in the TPS62120 and indicates once the output voltage is in regulation.

The TPS62120 has an additional SGND pin which is connected to GND during shutdown mode. This output can be used to discharge the output capacitor.

The TPS6212x operates over an free air temperature range of –40°C to 85°C. The TPS62120 is available in a small 8-pin SOT-23 package and the TPS62122 in a 2 mm × 2 mm 6-pin DFN package.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPS62120 SOT-23 (8) 2.90 mm × 1.63 mm
TPS62122 SON (6) 2.00 mm × 2.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application Schematic

TPS62120 TPS62122 typ_app_lvsad5_1.gif

Efficiency vs Output Current

TPS62120 TPS62122 typ_app_lvsad5_2.gif