SLVSC68A June   2015  – June 2015 TPS62745 , TPS627451

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Typical Application Schematic
  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 Timing Characteristics
    7. 7.7 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 DCS-Control™
      2. 8.3.2 Enable / Shutdown
      3. 8.3.3 Power Good Output (PG)
      4. 8.3.4 Output Voltage Selection (VSEL1 - 4)
      5. 8.3.5 Input Voltage Switch
    4. 8.4 Device Functional Modes
      1. 8.4.1 Soft Start
    5. 8.5 VOUT Discharge
    6. 8.6 Internal Current Limit
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Output Voltage Selection (VSEL1 - 4)
        2. 9.2.2.2 Output Filter Design (Inductor and Output Capacitor)
        3. 9.2.2.3 Inductor Selection
        4. 9.2.2.4 DC/DC Output Capacitor Selection
        5. 9.2.2.5 Input Capacitor Selection
      3. 9.2.3 Application Curves
    3. 9.3 System Examples
      1. 9.3.1 TPS62745 Set to a Fixed Voltage of 3.3 V
        1. 9.3.1.1 Design Requirements
        2. 9.3.1.2 Detailed Design Procedure
        3. 9.3.1.3 Application Curves
      2. 9.3.2 Dynamic Voltage Change on TPS62745
        1. 9.3.2.1 Design Requirements
        2. 9.3.2.2 Detailed Design Procedure
        3. 9.3.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  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

Package Options

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

1 Features

  • Input Voltage Range VIN from 3.3 V to 10 V
  • Typical 400 nA Quiescent Current
  • Up to 90% efficiency with load currents >15 µA
  • Up to 300 mA Output Current
  • RF Friendly DCS-Control™
  • Low Output Ripple Voltage
  • 16 Selectable Output Voltages from
    • 1.8 V to 3.3 V (TPS62745)
    • 1.3 V to 2.8 V (TPS627451)
  • Integrated input voltage switch
  • Integrated Discharge Function at VOUT
  • Open Drain Power Good Output
  • Operates with a Tiny 3.3 µH or 4.7 µH Inductor
  • Small 3 mm x 2 mm WSON Package

2 Applications

  • Bluetooth® Low Energy, RF4CE, Zigbee
  • Industrial Metering
  • Energy Harvesting

3 Description

The TPS62745 is a high efficiency ultra low power synchronous step down converter optimized for low power wireless applications. It provides a regulated output voltage consuming only 400-nA quiescent current. The device operates from two rechargeable Li-Ion batteries, Li-primary battery chemistries such as Li-SOCl2, Li-SO2, Li-MnO2 or four to six cell alkaline batteries. The input voltage range up to 10 V allows also operation from a USB port and thin-film solar modules. The output voltage is set with four VSEL pins between 1.8 V and 3.3 V for TPS62745 or 1.3 V and 2.8 V for TPS627451. TPS62745 features low output ripple voltage and low noise with a small output capacitor. An internal input voltage switch controlled by pin EN_VIN_SW connects the supply voltage to pin VIN_SW. The switch is intended to be used for an external voltage divider, scaling down the input voltage for an external ADC. The switch is automatically opened when the supply voltage is below the undervoltage lockout threshold. The TPS62745 is available in a small 12 pin 3 mm × 2 mm WSON package.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPS62745 WSON 3 mm x 2 mm
TPS627451
  1. For all available packages, see the orderable addendum at the end of the datasheet.

4 Typical Application Schematic

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TPS62745 TPS627451 TPS627450_1V8.gif

Efficiency vs Output Current; Vo = 3.3 V

TPS62745 TPS627451 A01_TPS62745_Efficiency_vs_ Iout_3V3.gif