SLVSFS7A March   2021  – January 2024 TPS62901

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Mode Selection and Device Configuration MODE/S-CONF
      2. 6.3.2 Adjustable VO Operation (External Voltage Divider)
      3. 6.3.3 Setable VO Operation (VSET and Internal Voltage Divider)
      4. 6.3.4 Soft Start / Tracking (SS/TR)
      5. 6.3.5 Smart Enable with Precise Threshold
      6. 6.3.6 Power Good (PG)
      7. 6.3.7 Undervoltage Lockout (UVLO)
      8. 6.3.8 Current Limit And Short-Circuit Protection
      9. 6.3.9 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 Pulse Width Modulation (PWM) Operation
      2. 6.4.2 AEE (Automatic Efficiency Enhancement)
      3. 6.4.3 Power Save Mode Operation (Auto PFM/PWM)
      4. 6.4.4 100% Duty-Cycle Operation
      5. 6.4.5 Output Discharge Function
      6. 6.4.6 Starting into a Prebiased Load
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application with Adjustable Output Voltage
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Custom Design With WEBENCH® Tools
        2. 7.2.2.2 Programming the Output Voltage
        3. 7.2.2.3 External Component Selection
        4. 7.2.2.4 Inductor Selection
        5. 7.2.2.5 Capacitor Selection
          1. 7.2.2.5.1 Output Capacitor
          2. 7.2.2.5.2 Input Capacitor
          3. 7.2.2.5.3 Soft-Start Capacitor
        6. 7.2.2.6 Tracking Function
        7. 7.2.2.7 Output Filter and Loop Stability
      3. 7.2.3 Application Curves
      4. 7.2.4 Typical Application with Setable VO using VSET
        1. 7.2.4.1 Design Requirements
        2. 7.2.4.2 Detailed Design Procedure
        3. 7.2.4.3 Application Curves
    3. 7.3 System Examples
      1. 7.3.1 LED Power Supply
      2. 7.3.2 Powering Multiple Loads
      3. 7.3.3 Voltage Tracking
    4. 7.4 Power Supply Recommendations
    5. 7.5 Layout
      1. 7.5.1 Layout Guidelines
      2. 7.5.2 Layout Example
        1. 7.5.2.1 Thermal Considerations
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
        1. 8.1.1.1 Custom Design With WEBENCH® Tools
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
  • RPJ|9
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.2.2.2 Programming the Output Voltage

The output voltage of the TPS62901 is adjustable. It can be programmed for output voltages from 0.6V to 5.5V using a resistor divider from VOUT to GND. The voltage at the FB pin is regulated to 600mV. The value of the output voltage is set by the selection of the resistor divider from Equation 10. It is recommended to choose resistor values that allow a current of at least 2μA, meaning the value of R2 must not exceed 400kΩ. Lower resistor values are recommended for highest accuracy and most robust design.

Equation 10. GUID-A9EFB41C-30F0-4EBC-AA2E-7F72E6DD7703-low.gif

With typical VFB = 0.6V:

Table 7-2 Setting the Output Voltage
NOMINAL OUTPUT VOLTAGE R1 R2 EXACT OUTPUT VOLTAGE
0.75V 24.9kΩ 100kΩ 0.749V
1.2V 100kΩ 100kΩ 1.2V
1.5V 150kΩ 100kΩ 1.5V
1.8V 200kΩ 100kΩ 1.8V
2.0V 49.9kΩ 21.5kΩ 1.992V
2.5V 100kΩ 31.6kΩ 2.498V
3.0V 100kΩ 24.9kΩ 3.009V
3.3V 113kΩ 24.9kΩ 3.322V
5.0V 182kΩ 24.9kΩ 4.985V