SLVSAQ5E March   2012  – May 2017 TPS62125


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and 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 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Undervoltage Lockout
      2. 7.3.2 Enable Comparator (EN / EN_hys)
      3. 7.3.3 Power Good Output and Output Discharge (PG)
      4. 7.3.4 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Pulse Width Modulation (PWM) Operation
      2. 7.4.2 Power-Save Mode
      3. 7.4.3 100% Duty Cycle Low Dropout Operation
      4. 7.4.4 Soft-Start
      5. 7.4.5 Short-Circuit Protection
  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. Output Voltage Setting
        2. Enable Threshold and Hysteresis Setting
        3. Power Good (PG) Pullup and Output Discharge Resistor
        4. Output Filter Design (Inductor and Output Capacitor)
        5. Inductor Selection
        6. Output Capacitor Selection
        7. Input Capacitor Selection
      3. 8.2.3 Application Curves
    3. 8.3 System Examples
      1. 8.3.1 TPS62125 5-V Output Voltage Configuration
      2. 8.3.2 TPS62125 5-V VOUT
      3. 8.3.3 TPS62125 Operation From a Storage Capacitor Charged From a 0.5 mA Current Source
      4. 8.3.4 5 V to -5 V Inverter Configuration
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 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

DSG Package
8-Pin WSON
Top View
TPS62125 TPS62125_pinout_2x2_QFN.gif

Pin Functions

EN 3 IN Input pin for the enable comparator. Pulling this pin to GND turns the device into shutdown mode. The DC/DC converter is enabled once the rising voltage on this pin trips the enable comparator threshold, VTH EN ON of typ. 1.2 V. The DC/DC converter is turned off once a falling voltage on this pin trips the threshold, VTH EN OFF of typ. 1.15 V. The comparator threshold can be increased by connecting an external resistor to pin EN_hys. See also application section. This pin must be terminated.
EN_hys 4 OUT Enable hysteresis open-drain output. This pin is pulled to GND when the voltage on the EN pin is below the comparator threshold VTH EN ON of typ. 1.2 V and the comparator has not yet tripped. The pin is high impedance once the enable comparator has tripped and the voltage at the pin EN is above the threshold VTH EN ON. The pin is pulled to GND once the falling voltage on the EN pin trips the threshold VTH EN OFF (1.15 V typical). This pin can be used to increase the hysteresis of the enable comparator. If not used, tie this pin to GND, or leave it open.
FB 5 IN This is the feedback pin for the regulator. An external resistor divider network connected to this pin sets the output voltage. In case of fixed output voltage option, the resistor divider is integrated and the pin need to be connected directly to the output voltage.
GND 1 PWR GND supply pin.
PG 8 OUT Open drain power good output. This pin is internally pulled to GND when the device is disabled or the output voltage is below the PG threshold. The pin is floating when the output voltage is in regulation and above the PG threshold. For power good indication, the pin can be connected via a pull up resistor to a voltage rail up to 10 . The pin can sink a current up to 0.4 mA and maintain the specified high/low voltage levels. It can be used to discharge the output capacitor with up to 10 mA. In this case the current into the pin must be limited with an appropriate pull up resistor. More details can be found in the application section. If not used, leave the pin open, or connect to GND.
SW 7 OUT This is the switch pin and is connected to the internal MOSFET switches. Connect the inductor to this pin. Do not tie this pin to VIN, VOUT or GND.
VIN 2 PWR VIN power supply pin.
VOS 6 IN This is the output voltage sense pin for the DCS-Control circuitry. This pin must be connected to the output voltage of the DC/DC converter.
Exposed Thermal PAD This pad must be connected to GND.