SLVSCF3A June   2014  – March 2015

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Simplified Schematic
  5. 5 Revision History
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Characteristics
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Typical Characteristics
  8. 8 Parametric Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Enable and Adjusting Undervoltage Lockout
      2. 9.3.2 Overvoltage Protection (OVP)
      3. 9.3.3 Hot Plug-in and In-Rush Current Control
      4. 9.3.4 Overload and Short Circuit Protection :
        1. 9.3.4.1 Overload Protection
        2. 9.3.4.2 Short Circuit Protection
        3. 9.3.4.3 Start-Up with Short on Output
        4. 9.3.4.4 Constant Current Limit Behavior During Overcurrent Faults
      5. 9.3.5 FAULT Response
      6. 9.3.6 Current Monitoring:
      7. 9.3.7 Power Good Comparator
      8. 9.3.8 IN, OUT and GND Pins
      9. 9.3.9 Thermal Shutdown:
    4. 9.4 Device Functional Modes
      1. 9.4.1 DevSleep Mode for SATA® Interface Devices
      2. 9.4.2 Shutdown Control
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 eFuse for Enterprise SSDs
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
          1. 10.2.1.2.1 Step by Step Design Procedure
          2. 10.2.1.2.2 Programming the Current-Limit Threshold: R(ILIM) Selection
          3. 10.2.1.2.3 Undervoltage Lockout and Overvoltage Set Point
          4. 10.2.1.2.4 Programming Current Monitoring Resistor - RIMON
          5. 10.2.1.2.5 Setting Output Voltage Ramp time (tdVdT)
            1. 10.2.1.2.5.1 Case1: Start-up Without Load: Only Output Capacitance C(OUT) Draws Current During Start-up
            2. 10.2.1.2.5.2 Case 2: Start-up With Load: Output Capacitance C(OUT) and Load Draws Current During Start-up
          6. 10.2.1.2.6 Programing the Power Good Set Point
          7. 10.2.1.2.7 Support Component Selections - R6, R7 and CIN
        3. 10.2.1.3 Application Curves
    3. 10.3 System Examples
      1. 10.3.1 Power Failure Protection and Data Retention in SSDs
      2. 10.3.2 Boost Power Rail Configuration for Data Retention in Enterprise SSDs
  11. 11Power Supply Recommendations
    1. 11.1 Transient Protection
    2. 11.2 Output Short-Circuit Measurements
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Related Links
    2. 13.2 Trademarks
    3. 13.3 Electrostatic Discharge Caution
    4. 13.4 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • RVC|20
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • 2.7 V – 18 V Operating Voltage, 20 V (Max)
  • 42 mΩ RON (Typical)
  • 0.6 A to 5.3 A Adjustable Current Limit (±8%)
  • IMON Current Indicator Output (±8%)
  • 200 μA Operating IQ (Typical)
  • 95 μA DevSleep Mode IQ (Typical)
  • 15 μA Disabled IQ (Typical)
  • ±2% Overvoltage, Undervoltage Threshold
  • Reverse Current Blocking
  • 1 μs Reverse Voltage Shutoff
  • Programmable dVo/dt Control
  • Power Good and Fault Outputs
  • -40°C to 125°C Junction Temperature Range
  • UL 2367 Recognized
    • File No. 169910
    • RILIM ≥ 20 kΩ (4.81 A max)
  • UL60950 - Safe during Single Point Failure Test
    • Open/Short ILIM detection

2 Applications

  • PCIe/SATA/SAS HDD and SSD Drives
  • Enterprise and Micro Servers
  • Smart Load Switch
  • Set-Top-Box (STB), DTVs and Game Consoles
  • RAID Cards - Holdup Power Management
  • Telecom Switches and Routers
  • Adapter Powered Devices

3 Description

The TPS25940 eFuse Power Switch is a compact, feature rich power management device with a full suite of protection functions, including a low power DevSleep™ mode that supports compliance with the SATA™ Device Sleep standard. The wide operating range allows control of many popular DC bus voltages. Integrated back to back FETs provide bidirectional current control making the device well suited for systems with load side holdup energy that must not drain back to a failed supply bus.

Load, source and device protection are provided with many programmable features including overcurrent, dVo/dt ramp and overvoltage, undervoltage thresholds. For system status monitoring and downstream load control, the device provides PGOOD, FLT and precise current monitor output. Precise programmable undervoltage, overvoltage thresholds and the low IQ DevSleep mode simplify SSD power management design.

The TPS25940 monitors V(IN) and V(OUT) to provide true reverse current blocking when V(IN) < (V(OUT) - 10 mV). This function supports swift changeover to a boosted voltage energy storage element in systems where backup voltage is greater than bus voltage.

Device Information(1)

PART NUMBER(2) PACKAGE BODY SIZE (NOM)
TPS25940A WQFN (20) 3.00 mm x 4.00 mm
TPS25940L
  1. For all available packages, see the orderable addendum at the end of the datasheet.
  2. TPS25940L = Latched, TPS25940A = Auto Retry

4 Simplified Schematic

TPS25940A TPS25940L Main_Page_Diagram.gif

Power Fail Detection and Blocking

TPS25940A TPS25940L fp_plot_lvscf3.png