SLVSCN9B December   2014  – June 2020 TPS61175-Q1


  1. Features
  2. Applications
  3. Description
    1.     Device Images
      1.      Simplified Schematic
  4. Revision History
  5. Pin Configuration and Functions
    1.     Pin Functions
  6. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Switching Frequency
      2. 7.3.2 Soft Start
      3. 7.3.3 Overcurrent Protection
      4. 7.3.4 Enable and Thermal Shutdown
      5. 7.3.5 Under Voltage Lockout (UVLO)
    4. 7.4 Device Functional Modes
      1. 7.4.1 Minimum ON Time and Pulse Skipping
  8. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. Determining the Duty Cycle
        2. Selecting the Inductor
        3. Computing the Maximum Output Current
        4. Setting Output Voltage
        5. Setting the Switching Frequency
        6. Setting the Soft Start Time
        7. Selecting the Schottky Diode
        8. Selecting the Input and Output Capacitors
        9. Compensating the Small Signal Control Loop
      3. 8.2.3 Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Trademarks
    2. 11.2 Electrostatic Discharge Caution
    3. 11.3 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

Pin Configuration and Functions

TPS61175-Q1 po_lvscn9.gif

Pin Functions

VIN 3 I The input supply pin for the IC. Connect VIN to a supply voltage between 2.9 V and 18 V. It is acceptable for the voltage on the pin to be different from the boost power stage input for applications requiring voltage beyond VIN range.
SW 1,2 I This is the switching node of the IC. Connect SW to the switched side of the indu1ctor.
FB 9 I Feedback pin for positive voltage regulation. Connect to the center tap of a resistor divider to program the output voltage.
EN 4 I Enable pin. When the voltage of this pin falls below the enable threshold for more than 10 ms, the IC turns off.
COMP 8 O Output of the internal transconductance error amplifier. An external RC network is connected to this pin to compensate the regulator.
SS 5 O Soft start programming pin. A capacitor between the SS pin and GND pin programs soft start timing. See application section for information on how to size the SS capacitor.
FREQ 10 O Switch frequency program pin. An external resistor is connected to this pin to set switch frequency. See application section for information on how to size the FREQ resistor.
AGND 7 I Signal ground of the IC
PGND 12,13,14 I Power ground of the IC. It is connected to the source of the PWM switch.
SYNC 6 I Switch frequency synchronous pin. Customers can use an external signal to set the IC switch frequency between 200-kHz and 2.2-MHz. If not used, this pin should be tied to AGND as short as possbile to avoid noise coupling.
NC 11 I Reserved pin. Must connect this pin to ground.
Thermal Pad The thermal pad should be soldered to the analog ground. If possible, use thermal via to connect to top and internal ground plane layers for ideal power dissipation.