TPS65295 complete DDR4 memory power solution

1 Features

• Synchronous buck converter (VDDQ)
  • Input voltage range: 4.5 V to 18 V
  • Output voltage fixed at 1.2 V
  • D-CAP3™ mode control for fast transient response
  • Continual output current: 8 A
  • Advanced Eco-mode™ pulse skip
  • Integrated 22-mΩ and 8.6-mΩ R_DS(on) internal power switch
  • 600-kHz switching frequency
  • Internal soft start: 1.6 ms
  • Cycle-by-cycle overcurrent protection
  • Latched output OV and UV protections
• Synchronous buck converter (VPP)
  • Input voltage range: 3 V to 5.5 V
  • Output voltage fixed at 2.5 V
  • D-CAP3™ mode control for fast transient response
  • Continual output current: 1 A
  • Advanced Eco-mode™ pulse skip
  • Integrated 150-mΩ and 120-mΩ R_DS(on) internal power switch
  • 580-kHz switching frequency
  • Internal soft start: 1 ms
  • Cycle-by-cycle overcurrent protection
  • Latched output OV and UV protections
• 1-A LDO (VTT)
  • 1-A continual sink and source current
  • Requires only 10 μF of ceramic output capacitor
  • Support high-z in S3
  • ±30-mV VTT output accuracy (DC+AC)
• Buffered reference (VTTREF)
  • Buffered, low noise, ±10-mA capability
  • 0.8% output accuracy
• Low quiescent current: 150 µA
• Power good indicator
• Output discharge function
• Power up and power down sequencing control
• Non-latch for OT and UVLO protections
• 18-pin 3.0-mm × 3.0-mm HotRod™ VQFN package

2 Applications

• DDR4 memory power supplies
• Notebook, PC computers, and servers
• Ultrabook, tablet computers
• Single-board computer, computer on module

3 Description

The TPS65295 device provides a complete power solution for DDR4 memory system with the lowest total cost and minimum space. It meets the JEDEC standard for DDR4 power-up and power-down sequence requirement. The TPS65295 integrates two synchronous buck converters (VPP and VDDQ) and a 1-A sink and source tracking LDO (VTT) and a buffered low noise reference (VTTREF). The TPS65295 employs D-CAP3™ mode coupled with 600-kHz switching frequency for ease-of-use, fast transient, and support for ceramic output capacitors without an external compensation circuit.

The VTTREF tracks ½ VDDQ within excellent 0.8% accuracy. The VTT, which provides both 1-A sink and source continual current capabilities, requires only 10-μF of ceramic output capacitor.

The TPS65295 provides rich functions as well as excellent power supply performance. It supports flexible power state control, placing VTT at high-Z in S3 and discharging VDDQ, VTT, and VTTREF in S4/S5 state. OVP, UVP, OCP, UVLO and thermal shutdown protections are also available. The part is available in a thermally enhanced 18-pin HotRod™ VQFN package and is designed to operate under the –40°C to 125°C junction temperature range.

1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application

4 Revision History