SLUU240B January   2006  – March 2022 TPS51120

 

  1.   Trademarks
  2. 1Description
  3. 2Electrical Performance
  4. 3Schematic
  5. 4Test Setup and Results
    1. 4.1 Test Setup
    2. 4.2 Test Procedure
    3. 4.3 Start-Up Performance
    4. 4.4 Transient Performance
  6. 5Configuration
    1. 5.1 Switching Frequency Selection
    2. 5.2 Skip Mode and Faults Disable Selection
    3. 5.3 Output Voltage Setting Selection
    4. 5.4 Control Scheme Selection
  7. 6EVM Assembly Drawing and PCB Layout
  8. 7List of Materials
  9. 8References
  10. 9Revision History

1 Description

The TPS51120 is a highly sophisticated dual current mode synchronous step-down controller. It is a full-featured controller designed to run directly off three to four-cell Li-ion battery and provide high power and 5-V, 3.3-V, or both, standby regulation for all the downstream circuitry in a notebook computer system. High current, 100-mA, 5-V, or 3.3-V on-board linear regulators have glitch-free switch over function to SMPS and can be kept alive independently during standby state. The pseudo-constant frequency adaptive on-time control scheme supports full range of current mode operation including simplified loop compensation, ceramic output capacitors, and seamless transition to reduced frequency operation at light-load condition. Optional D-CAP™ mode operation optimized for SP-CAP or POSCAP output capacitors allows further reduction of external compensation parts.

The TPS51120EVM-001 evaluation module is a high efficiency, dual synchronous buck converter providing 5 V at 6 A and 3.3 V at 6 A from 8-V to 25-V input. This user’s guide describes the TPS51120EVM-001 performance in D-CAP mode and RDS(on) current sensing.