SLUSEA4D June   2021  – August 2022 TPS62932 , TPS62933 , TPS62933F , TPS62933O , TPS62933P

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
  8. 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. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1  Fixed Frequency Peak Current Mode
      2. 9.3.2  Pulse Frequency Modulation
      3. 9.3.3  Voltage Reference
      4. 9.3.4  Output Voltage Setting
      5. 9.3.5  Switching Frequency Selection
      6. 9.3.6  Enable and Adjusting Undervoltage Lockout
      7. 9.3.7  External Soft Start and Prebiased Soft Start
      8. 9.3.8  Power Good
      9. 9.3.9  Minimum On Time, Minimum Off Time, and Frequency Foldback
      10. 9.3.10 Frequency Spread Spectrum
      11. 9.3.11 Overvoltage Protection
      12. 9.3.12 Overcurrent and Undervoltage Protection
      13. 9.3.13 Thermal Shutdown
    4. 9.4 Device Functional Modes
      1. 9.4.1 Modes Overview
      2. 9.4.2 Heavy Load Operation
      3. 9.4.3 Light Load Operation
      4. 9.4.4 Out of Audio Operation
      5. 9.4.5 Forced Continuous Conduction Operation
      6. 9.4.6 Dropout Operation
      7. 9.4.7 Minimum On-Time Operation
      8. 9.4.8 Shutdown Mode
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1  Custom Design With WEBENCH® Tools
        2. 10.2.2.2  Output Voltage Resistors Selection
        3. 10.2.2.3  Choosing Switching Frequency
        4. 10.2.2.4  Soft-Start Capacitor Selection
        5. 10.2.2.5  Bootstrap Capacitor Selection
        6. 10.2.2.6  Undervoltage Lockout Setpoint
        7. 10.2.2.7  Output Inductor Selection
        8. 10.2.2.8  Output Capacitor Selection
        9. 10.2.2.9  Input Capacitor Selection
        10. 10.2.2.10 Feedforward Capacitor CFF Selection
        11. 10.2.2.11 Maximum Ambient Temperature
      3. 10.2.3 Application Curves
    3. 10.3 What to Do and What Not to Do
  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. 13.1.2 Development Support
        1. 13.1.2.1 Custom Design With WEBENCH® Tools
    2. 13.2 Receiving Notification of Documentation Updates
    3. 13.3 Support Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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

9.1 Overview

The TPS62932 and TPS62933x are a 30-V, 2-A and 3-A, synchronous buck (step-down) converters with two integrated n-channel MOSFETs. They employ fixed-frequency peak current control mode for fast transient response and good line and load regulation. With the optimized internal loop compensation, the devices eliminate the external compensation components over a wide range of output voltage and switching frequency.

The integrated 76-mΩ and 32-mΩ MOSFETs allow for high-efficiency power supply designs with continuous output currents up to 2 A (TPS62932) or 3 A (TPS62933 and TPS62933x). The feedback reference voltage is designed at 0.8 V. The output voltage can be stepped down from 0.8 V to 22 V. The devices are ideally suited for systems powered from 5-V, 12-V, 19-V, and 24-V power-bus rails.

The TPS6293x has been designed for safe monotonic start-up into prebiased loads. The default start-up is at VIN equal to 3.8 V. After the device is enabled, the output rises smoothly from 0 V to its regulated voltage. The TPS6293x has low operating current when not switching under no load, especially the TPS62932, TPS62933, and TPS62933P whose operating current is 12 μA (typical). When the TPS6293x is disabled, the supply current is approximately 2 µA (typical). These features are extremely beneficial for long battery life time in low-power operation.

Pulse frequency modulation (PFM) mode allows the TPS62932, TPS62933, and TPS62933P to maximize the light-load efficiency. Continuous current mode allows the TPS62933F to have low output ripple in all load conditions. The TPS62933O operates in out of audio mode which can avoid the audible noise.

The EN pin has an internal pullup current that can be used to adjust the input voltage undervoltage lockout (UVLO) with two external resistors. In addition, the EN pin can be floating for the device to operate with the internal pullup current.

The switching frequency can be set by the configuration of the RT pin in the range of 200 kHz to 2.2 MHz, which allows for efficiency and solution size optimization when selecting the output filter components. The TPS62932, TPS62933, TPS62933P, and TPS62933O also have a frequency spread spectrum feature, which helps with lowering down EMI noise.

A small value capacitor or resistor divider is connected to the SS pin of the TPS62932, TPS62933, and TPS62933F for soft-start time setting or voltage tracking. The TPS62933P and TPS62933O indicate power good through PG pin.

The devices have the on-time extension function with a maximum on time of 7 μs (typical). During low dropout operation, the high-side MOSFET can turn on up to 7 μs, then the high-side MOSFET turns off and the low-side MOSFET turns on with a minimum off time of 140 ns (typical). The devices support the maximum 98% duty cycle.

The devices reduce the external component count by integrating the bootstrap circuit. The bias voltage for the integrated high-side MOSFET is supplied by a capacitor between the BST and SW pins. A UVLO circuit monitors the bootstrap capacitor voltage, VBST-SW. When it falls below a preset threshold of 2.5 V (typical), the SW pin is pulled low to recharge the bootstrap capacitor.

Cycle-by-cycle current limiting on the high-side MOSFET protects the device in overload situations and is enhanced by a low-side sourcing current limit, which prevents current runaway. The TPS6293x provides output undervoltage protection (UVP) when the regulated output voltage is lower than 65% of the nominal voltage due to overcurrent being triggered, approximately 256-μs (typical) deglitch time later, both the high-side and low-side MOSFET turn off, the device steps into hiccup mode.

The devices minimize excessive output overvoltage transient by taking advantage of the overvoltage comparator. When the regulated output voltage is greater than 115% of the nominal voltage, the overvoltage comparator is activated, and the high-side MOSFET is turned off and masked from turning on until the output voltage is lower than 110%.

Thermal shutdown disables the devices when the die temperature, TJ, exceeds 165°C and enables the devices again after TJ decreases below the hysteresis amount of 30°C.