SLVS644E February   2006  – December 2014 TPS61080 , TPS61081


  1. Features
  2. Applications
  3. Description
  4. 5-V To 12-V, 250-mA Step-Up DC-DC Converter
  5. Revision History
  6. Device Comparison Table
  7. Pin Configuration and Functions
  8. Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Typical Characteristics
  9. Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Start Up
      2. 9.3.2 Overcurrent and Short Circuit Protection
      3. 9.3.3 Overvoltage Protection
      4. 9.3.4 Undervoltage Lockout (UVLO)
      5. 9.3.5 Thermal Shutdown
    4. 9.4 Device Functional Modes
      1. 9.4.1 Enable
      2. 9.4.2 Frequency Selection
      3. 9.4.3 Maximum and Minimum Output Current
  10. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1 Program Output Voltage
      2. 10.1.2 Feed Forward Capacitor
      3. 10.1.3 Soft Start Capacitor
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. Inductor Selection
        2. Input And Output Capacitor Selection
      3. 10.2.3 Application Curves
    3. 10.3 System Examples
      1. 10.3.1 Torch Light and Flash Light
      2. 10.3.2 24Vout Output Converter
      3. 10.3.3 30 WLEDs Driver in Media Factor Form Display
        1. ±15 V Dual Output Converter
        2. Step-Up DC-DC Converter with Output Doubler
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 Third-Party Products Disclaimer
    2. 13.2 Related Links
    3. 13.3 Trademarks
    4. 13.4 Electrostatic Discharge Caution
    5. 13.5 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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

7 Pin Configuration and Functions

10-Pin VSON
(DRC) Package with Thermal Pad
Top View

Pin Functions

EN 6 I Enable pin. When the voltage of this pin falls below enable threshold for more than 74 ms, the IC turns off and consumes less than 2 μA current.
FB 5 I Voltage feedback pin for the output regulation. It is regulated to an internal reference voltage. An external voltage divider from the output to GND with the center tap connected to this pin programs the regulated voltage. This pin can also be connected to a low side current sense resistor to program current regulation.
FSW 7 I Switching frequency selection pin. Logic high on the pin selects 1.2 MHz, while logic low reduces the frequency to 600 kHz for better light load efficiency.
GND 4 Signal ground of the IC
L 1 I The inductor is connected between this pin and the SW pin. This pin connects to the source of the isolation FET as well. Minimize trace area at this pin to reduce EMI.
OUT 9 O Output of the boost regulator. When the output voltage exceeds the 27-V overvoltage protection (OVP) threshold, the PWM switch turns off until Vout drops 0.7V below the overvoltage threshold.
PGND 8 Power ground of the IC. It is connected to the source of the PWM switch. This pin should be made very close to the output capacitor in layout.
SS 3 I Soft start programming pin. A capacitor between the SS pin and GND pin programs soft start timing.
SW 10 I Switching node of the IC. Connect the inductor between this pin and the L pin.
VIN 2 I Input pin to the IC. It is the input to the boost regulator, and also powers the IC circuit. It is connected to the drain of the isolation FET as well.
Thermal Pad The thermal pad should be soldered to the analog ground. If possible, use thermal via to connect to ground plane for ideal power dissipation.