SLVSAL1E March   2011  – April 2016 TPS24720

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 THERMAL INFORMATION
    4. 6.4 Recommended Operating Conditions
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Detailed Pin Descriptions
        1. 7.3.1.1  EN
        2. 7.3.1.2  ENSD
        3. 7.3.1.3  FFLTb
        4. 7.3.1.4  FLTb
        5. 7.3.1.5  GATE
        6. 7.3.1.6  GND
        7. 7.3.1.7  IMON
        8. 7.3.1.8  LATCH
        9. 7.3.1.9  OUT
        10. 7.3.1.10 OV
        11. 7.3.1.11 PGb
        12. 7.3.1.12 PROG
        13. 7.3.1.13 SENSE
        14. 7.3.1.14 SET
        15. 7.3.1.15 TIMER
        16. 7.3.1.16 VCC
    4. 7.4 Device Functional Modes
      1. 7.4.1  Board Plug-In
      2. 7.4.2  Inrush Operation
      3. 7.4.3  Action of the Constant-Power Engine
      4. 7.4.4  Circuit Breaker and Fast Trip
      5. 7.4.5  Automatic Restart
      6. 7.4.6  PGb, FLTb, and Timer Operations
      7. 7.4.7  Overtemperature Shutdown
      8. 7.4.8  Start-Up of Hot-Swap Circuit by VCC or EN
      9. 7.4.9  Minimization of Power Dissipation at STANDY by ENSD
      10. 7.4.10 Fault Detection of MOSFET Short With FFLTb
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Power-Limited Start-Up
          1. 8.2.2.1.1 STEP 1. Choose RSENSE, RSET, and RIMON
          2. 8.2.2.1.2 STEP 2. Choose MOSFET M1
          3. 8.2.2.1.3 STEP 3. Choose Power-Limit Value, PLIM, and RPROG
          4. 8.2.2.1.4 STEP 4. Choose Output Voltage Rising Time, tON, and Timing Capacitor CT
          5. 8.2.2.1.5 STEP 5. Calculate the Retry-Mode Duty Ratio
          6. 8.2.2.1.6 STEP 6. Select R1, R2, and R3 for UV and OV
          7. 8.2.2.1.7 STEP 7. Choose RGATE, R4, R5, R6, and C1
        2. 8.2.2.2 Additional Design Considerations
          1. 8.2.2.2.1 Use of PGb
          2. 8.2.2.2.2 Output Clamp Diode
          3. 8.2.2.2.3 Gate Clamp Diode
          4. 8.2.2.2.4 High-Gate-Capacitance Applications
          5. 8.2.2.2.5 Bypass Capacitors
          6. 8.2.2.2.6 Output Short-Circuit Measurements
      3. 8.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

1 Features

  • 2.5-V to 18-V Operation
  • Accurate Current Limiting for Startup
  • Programmable FET SOA Protection
  • Adjustable Current Sense Threshold
  • Programmable Fault Timer
  • Power-Good Output
  • Fast Breaker for Short-Circuit Protection
  • Analog Load-Current Monitor Output
  • Programmable UV and OV
  • Low-current Standby Mode
  • FET Fault Detection Flag
  • 3-mm × 3-mm, 16-Pin QFN package

2 Applications

  • Server Backplanes
  • Storage Area Networks (SAN)
  • Telecommunications Mezzanine Cards
  • Medical Systems
  • Plug-In Modules
  • Base Stations

3 Description

The TPS24720 is an easy-to-use, full-featured protection device for 2.5-V to 18-V power rails. This hot-swap controller drives an external N-channel MOSFET, while protecting source, load and external MOSFET against multiple potentially damaging events. During startup, load current and MOSFET power dissipation are limited to user-selected values. After startup, currents above the user-selected limit will be allowed to flow until programmed timeout – except in extreme overload events when load is immediately disconnected from source.

Programmable power limiting ensures the external MOSFET operates inside its safe operating area (SOA) at all times. This allows use of smaller FETs while improving system reliability. Power good, Fault, FET Fault, and current monitor outputs are provided for system status monitoring and downstream load control.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPS24720 VQFN (16) 3.00 mm × 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Typical Application (12 V at 10 A)

TPS24720 fp_schematic_slvsal1.gif