SLVU251B June   2008  – February 2022 TPS51220

 

  1.   Trademarks
  2. 1Description
  3. 2Electrical Performance
  4. 3Schematic
  5. 4Test Setup and Procedure
    1. 4.1 Test Setup
    2. 4.2 Test Procedure
  6. 5Configuration
    1. 5.1 Switching Frequency Selection
    2. 5.2 Skip Mode and Control Scheme Selection
    3. 5.3 Current-Sensing Selection
    4. 5.4 Overcurrent Limit and Discharge Selection
    5. 5.5 Control Mode and Protection Selection
    6. 5.6 Soft-Start Setting Selection
    7. 5.7 Output Voltage Adjustment
  7. 6Bill of Materials
  8. 7EVM Assembly Drawing and PCB Layout
  9. 8Reference
  10. 9Revision History

1 Description

The TPS51220 is a dual, peak-current mode, synchronous step-down controller with three low-dropout (LDO) regulators. It is optimized for 5-V /3.3-V notebook system power supplies. A 99% duty cycle operation enables designers to complete Li-ion battery applications from 2-cells to 4-cells cost effectively. The TPS51220 supports high-efficiency, fast transient response and 99% duty cycle operation. DCR current sensing provides lossless current sensing and free MOSFET selection; resistor sensing supports accurate current-sensing operation. It supports supply input voltages ranging from 4.5 V to 30 V and output voltages from 1 V to 12 V. High-current, 5 V at 100 mA, 3.3 V at 10 mA, onboard linear regulators have glitch-free switchover function to SMPS, and the 2-V reference has a 100-μA capability.

A peak current-sensing current mode and fixed-frequency control scheme support the full range of current mode operation including simplified loop compensation, ceramic output capacitors, as well as a seamless transition to reduced frequency operation at light-load condition.

This evaluation module demonstrates the performance of the high-current/ high-efficiency TPS51220 buck converter