SLUSAE1E December  2010  – August 2016 TPS51916


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics
    6. 6.6Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
      1. 7.3.1 VDDQ Switch Mode Power Supply Control
      2. 7.3.2 VREF and REFIN, VDDQ Output Voltage
      3. 7.3.3 Soft-Start and Powergood
      4. 7.3.4 Power State Control
      5. 7.3.5 Discharge Control
      6. 7.3.6 VTT and VTTREF
      7. 7.3.7 VDDQ Overvoltage and Undervoltage Protection
      8. 7.3.8 VDDQ Out-of-Bound Operation
      9. 7.3.9 VDDQ Overcurrent Protection
      10. 7.3.10VTT Overcurrent Protection
      11. 7.3.11V5IN Undervoltage Lockout Protection
      12. 7.3.12Thermal Shutdown
    4. 7.4Device Functional Modes
      1. 7.4.1MODE Pin Configuration
      2. 7.4.2D-CAP™ Mode
    5. 7.5D-CAP2™ Mode Operation
  8. Application and Implementation
    1. 8.1Application Information
      1. 8.1.1DDR3, D-CAP™ 400-kHz Application with Tracking Discharge
        1. Requirements
        2. Design Procedure
          1. Determine the value of R1 AND R2
          2. Choose the inductor
          3. Choose the OCL setting resistance, RTRIP
          4. the output capacitors
        3. Curves
      2. 8.1.2DDR3, DCAP-2 500-kHz Application, with Tracking Discharge
        1. Requirements
        2. Design Procedure
          1. Mode and Switching Frequency
          2. output capacitance
        3. Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Example
  11. 11Device and Documentation Support
    1. 11.1Receiving Notification of Documentation Updates
    2. 11.2Community Resources
    3. 11.3Trademarks
    4. 11.4Electrostatic Discharge Caution
    5. 11.5Glossary
  12. 12Mechanical, Packaging, and Orderable Information

1 Features

  • Synchronous Buck Controller (VDDQ)
    • Conversion Voltage Range: 3 V to 28 V
    • Output Voltage Range: 0.7 V to 1.8 V
    • 0.8% VREF Accuracy
    • Selectable Control Architecture
      • D-CAP™ Mode for Fast Transient Response
      • D-CAP2™ Mode for Ceramic Output Capacitors
    • Selectable 300 kHz, 400 kHz, 500 kHz, or 670 kHz Switching Frequencies
    • Optimized Efficiency at Light and Heavy Loads with Auto-skip Function
    • Supports Soft-Off in S4 and S5 States
    • OCL/OVP/UVP/UVLO Protections
    • Powergood Output
  • 2-A LDO(VTT), Buffered Reference(VTTREF)
    • 2-A (Peak) Sink and Source Current
    • Buffered, Low Noise, 10-mA VTTREF Output
    • 0.8% VTTREF, 20-mV VTT Accuracy
    • Supports High-Z (S3) and Soft-Off (S4, S5)
  • Thermal Shutdown
  • 20-Pin, 3 mm × 3 mm, QFN Package
  • Create a WEBENCH Design

2 Applications

  • Memory Power Supplies: DDR2, DDR3, DDR3L, DDR4
  • Termination: SSTL_18, SSTL_15, SSTL_135, HSTL

3 Description

The TPS51916 device provides a complete power supply for DDR2, DDR3, DDR3L, and DDR4 memory systems in the lowest total cost and minimum space. It integrates a synchronous buck regulator controller (VDDQ) with a 2-A sink and 2-A source tracking LDO (VTT) and buffered low noise reference (VTTREF).

The device employs D-CAP™ mode coupled with 300 kHz or 400 kHz frequencies for ease-of-use and fast transient response or D-CAP2™ mode coupled with higher 500 kHz or 670 kHz frequencies to support ceramic output capacitor without an external compensation circuit. The VTTREF tracks VDDQ/2 within excellent 0.8% accuracy. The VTT, which provides 2-A sink and 2-A source peak current capabilities, requires only 10-μF of ceramic capacitance. A dedicated LDO supply input is available.

The device also provides excellent power supply performance. It supports flexible power state control, placing VTT at high-Z in S3 and discharging VDDQ, VTT and VTTREF (soft-off) in S4 or S5 state. Programmable OCL with low-side MOSFET RDS(on) sensing, OVP, UVP, UVLO and thermal shutdown protections are also available.

Device Information(1)

TPS51916QFN (20)3 mm × 3 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Application

TPS51916 simp_app_fiddler3.gif


4 Revision History

Changes from D Revision (June 2012) to E Revision

  • Added Pin Configuration and Functions section, ESD Rating table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, Receiving Notification of Documentation Updates section, Community Resources section, and Mechanical, Packaging, and Orderable Information section, and Mechanical, Packaging, and Orderable Information section Go
  • Changed Minimum S3 or S5 high-level voltage from "1.8 V" to "1.5 V" in Electrical Characteristics tableGo

Changes from C Revision (March 2012) to D Revision