SLUSF35 November   2023 TPSM828510 , TPSM828511 , TPSM828512

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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
  8. 7 Parameter Measurement Information
    1. 7.1 Schematic
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Precise Enable (EN)
      2. 8.3.2 MODE/SYNC
      3. 8.3.3 Undervoltage Lockout (UVLO)
      4. 8.3.4 Power-Good Output (PG)
      5. 8.3.5 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Pulse Width Modulation (PWM) Operation
      2. 8.4.2 Power Save Mode Operation (PFM/PWM)
      3. 8.4.3 100% Duty-Cycle Operation
      4. 8.4.4 Current Limit and Short-Circuit Protection
      5. 8.4.5 Output Discharge
      6. 8.4.6 Soft Start / Tracking (SS/TR)
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Programming the Output Voltage
        2. 9.2.2.2 Feedforward Capacitor
        3. 9.2.2.3 Input Capacitor
        4. 9.2.2.4 Output Capacitor
        5. 9.2.2.5 Application Curves
    3. 9.3 System Examples
      1. 9.3.1 Voltage Tracking
      2. 9.3.2 Synchronizing to an External Clock
    4. 9.4 Power Supply Recommendations
    5. 9.5 Layout
      1. 9.5.1 Layout Guidelines
      2. 9.5.2 Layout Example
        1. 9.5.2.1 Thermal Consideration
  11. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Third-Party Products Disclaimer
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Receiving Notification of Documentation Updates
    4. 10.4 Support Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

Package Options

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

9.3.2 Synchronizing to an External Clock

The TPSM82851x can be synchronized by applying a clock on the MODE/SYNC pin. There is no need for any additional circuitry. See Figure 9-30. The clock can be applied, changed, and removed during operation. TI recommends the value of the RCF resistor to be chosen such that the internally defined frequency and the externally-applied frequency are close to each other to have a fast settling time to the external clock. Synchronizing to a clock is not possible, if the COMP/FSET pin is connected to Vin or GND. Figure 9-31 and Figure 9-32 show the external clock being applied and removed. When an external clock is applied, the device operates in PWM mode.

GUID-20230913-SS0I-MDH8-GC80-HJN8K96SFR9V-low.svg Figure 9-30 Frequency Synchronization
GUID-39FDA803-AFF0-4E8F-BACB-41383057AF8D-low.gif
VIN = 5 VRCF = 8.06 kΩIOUT = 0.1 A
VOUT = 1.8 VfEXT = 2.5 MHz
Figure 9-31 Applying and Removing the Synchronization Signal (PFM)
GUID-261931C4-2994-4403-80E9-CF604A5DF0C4-low.gif
VIN = 5 VRCF = 8.06 kΩIOUT = 1 A
VOUT = 1.8 VfEXT = 2.5 MHz
Figure 9-32 Applying and Removing the Synchronization Signal (FPWM)