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  • TPS2474x 2.5-V to 18-V High Performance Hot Swap and ORing Controller

    • SLVSCV6A January   2015  – February 2015 TPS24740 , TPS24741 , TPS24742

      PRODUCTION DATA.  

  • CONTENTS
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  • TPS2474x 2.5-V to 18-V High Performance Hot Swap and ORing Controller
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Simplified Schematics
  5. 5 Revision History
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Timing Requirements
    7. 8.7 Typical Characteristics
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1  Internal Power ORing of TPS24740
      2. 9.3.2  Enable and Over-voltage Protection
      3. 9.3.3  Current Limit and Power Limit During Start-up
      4. 9.3.4  Two Level Protection During Regular Operation
      5. 9.3.5  Dual Timer (TFLT and TINR)
      6. 9.3.6  Using SoftStart - IHGATE and TINR Considerations
      7. 9.3.7  Three Options for Response to a Fast Trip
      8. 9.3.8  Programmable Reverse Voltage Threshold
      9. 9.3.9  Analog Current Monitor
      10. 9.3.10 Power Good Flag
      11. 9.3.11 ORing MOSFET Status Indicator
      12. 9.3.12 Fault Reporting
    4. 9.4 Device Functional Modes
      1. 9.4.1 ORing Functional Modes
      2. 9.4.2 Hot Swap Functional Modes
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 30A Single channel OR then Hot Swap With Current Monitoring
      2. 10.2.2 Design Requirements
      3. 10.2.3 Detailed Design Procedure
        1. 10.2.3.1  Select RSNS and VSNS,CL Setting
        2. 10.2.3.2  Selecting the Fast Trip Threshold and Filtering
        3. 10.2.3.3  Selecting the Hot Swap FET(s)
        4. 10.2.3.4  Select Power Limit
        5. 10.2.3.5  Set Fault Timer
        6. 10.2.3.6  Check MOSFET SOA
        7. 10.2.3.7  Choose ORing MOSFET
        8. 10.2.3.8  Choose Reverse Current Threshold and Filtering
        9. 10.2.3.9  Choose Under Voltage and Over Voltage Settings
        10. 10.2.3.10 Selecting CIN, COUT, and CMIDDLE
        11. 10.2.3.11 Selecting D1 and D2
        12. 10.2.3.12 Ensuring Stability
        13. 10.2.3.13 Compute Tolerances
      4. 10.2.4 Application Curves
      5. 10.2.5 40 A Single Channel Hot Swap then ORing
        1. 10.2.5.1 Design Requirements
        2. 10.2.5.2 Design Procedure
          1. 10.2.5.2.1  Select RSNS and VSNS,CL Setting
          2. 10.2.5.2.2  Selecting the Fast Trip Threshold and Filtering
          3. 10.2.5.2.3  Selecting the Hot Swap FET
          4. 10.2.5.2.4  Select Power Limit
          5. 10.2.5.2.5  Set Fault Timer
          6. 10.2.5.2.6  Check MOSFET SOA
          7. 10.2.5.2.7  Checking Stability of Hot Swap Loop
          8. 10.2.5.2.8  Choose ORing MOSFET
          9. 10.2.5.2.9  Choose Reverse Current Threshold and Filtering
          10. 10.2.5.2.10 Choose Under Voltage and Over Voltage Settings
          11. 10.2.5.2.11 Selecting CIN, COUT, CMIDDLE, and Transient Protection
          12. 10.2.5.2.12 Adding CENHS
        3. 10.2.5.3 Application Curves
    3. 10.3 System Examples
      1. 10.3.1 TPS2474x in Battery Back Up
      2. 10.3.2 TPS2474x in Priority Muxing
      3. 10.3.3 TPS2474x with Multiple Loads and Multiple Supplies
      4. 10.3.4 Two Supplies Powering a Load
      5. 10.3.5 TPS2474x in Redundant DC/DC Applications
  11. 11Power Supply Recommendations
  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
  15. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • RGE|24
    • MPQF124G
Thermal pad, mechanical data (Package|Pins)
  • RGE|24
    • QFND008AA
Orderable Information
  • slvscv6a_oa
  • slvscv6a_pm
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DATA SHEET

TPS2474x 2.5-V to 18-V High Performance Hot Swap and ORing Controller

1 Features

  • 2.5V to 18V Bus Operation (30V abs max)
  • Programmable Protection Settings:
    • Current Limit: ±5% at 10mV
    • Fast Trip: ±10% at 20mV
    • Reverse Voltage: ±1mV at –1 mV
  • Programable Response Time for Fast Trip and Reverse Voltage
  • Programmable FET SOA Protection
  • Dual Timer (Inrush/Fault)
  • Interchangeable Hot Swap and ORing
  • Analog Current Monitor (1% at 25mV)
  • Status Flags for Faults and Power Good
  • UV and OV Protection
  • Independent EN for Hot Swap and ORing
  • 4mm × 4mm 24-pin QFN
  • 40 = Latch, 41 = Retry, 42 = Fast Latch Off

2 Applications

  • Enterprise Storage
  • Power Muxing
  • Redundant Power Supplies
  • Battery Back Up

3 Description

The TPS2474x is an integrated ORing and Hot Swap controller for 2.5 V to 18 V systems. It's precise and programmable protection settings aid in the design of high power, high availability systems where isolating faults is critical.

Programmable current limit, fast shut down, and fault timer protect the load and supply during fault conditions such as a hot - short. The fast shutdown threshold and response time can be tuned to ensure a fast response to real faults, while avoiding nuisance trips. Programmable SOA (Safe Operating Area) protection and the inrush timer keep the MOSFET safe under all operating conditions. After asserting a power good, TPS2474x runs the fault timer during over-current events, but doesn't current limit. It shuts down after the fault timer expires. Two independent timers (inrush/fault) allow the user to customize protection based on system requirements. The ORing function of the TPS2474x allows the user to program the reverse voltage threshold and response time to aid in the design of redundant power supply systems.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPS24740
TPS24741
TPS24742		 VQFN (24) 4.00 mm x 4.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

4 Simplified Schematics

TPS24740 TPS24741 TPS24742 OR_HS_Front_slvscv6.gif

TPS2474x in Priority Muxing

TPS24740 TPS24741 TPS24742 BD_Front_slvscv6.gif

5 Revision History

Changes from * Revision (January 2015) to A Revision

  • Published full Production Data sheet to include Specification tables, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go

6 Device Comparison Table

PART NUMBER(1) LATCH / RETRY OPTION
TPS24740 Latch
TPS24741 Auto – Retry
TPS24742 Fast Latch Off
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com.

7 Pin Configuration and Functions

QFN 24-Pin with Thermal Pad
RGE Package
Top View
TPS24740 TPS24741 TPS24742 Pinout_RGE24_SLVSCV6.gif

Table 1. Pin Functions

PIN TYPE(1) DESCRIPTION
NAME NO.
A 23 I/P Voltage sense input that connects to the OR MOSFET's body diode's anode. Connect to the OR MOSFET source in the typical configuration. A pin is used to supply power to the ORing block of the TPS2474x under certain biasing conditions.
BGATE 22 O Connect to the gate of the external OR MOSFET. Controls the OR MOSFET to emulate a low forward-voltage diode.
C 20 I/P Voltage sense input that connects to the OR MOSFET's body diode's cathode. Connect to the OR MOSFET drain in the typical configuration. C pin is used to supply power to the ORing block of the TPS2474x under certain biasing conditions.
CP 1 I/O Connect a storage capacitor from CP to A for fast turn-on of blocking Gate.
ENHS 2 I Active-high enable input of Hot-swap. Logic input. Connects to resistor divider.
ENOR 3 I Active-high enable input of Oring. Logic input. Connects to resistor divider.
FLTb 4 O Active-low, open-drain output indicating various faults.
FSTP 16 I Fast trip programming set pin for hot-swap. Connect RFSTP from the positive terminal of the Hot Swap sense resistor to the FSTP pin.
GND 10 – Ground.
HGATE 18 O Gate driver output for external Hot Swap MOSFET.
IMON 12 I/O Analog current monitor and load current limit program point. Connect RIMON to ground.
IMONBUF 13 O Voltage output proportional to the load current (0V–3.0V).
OUTH 19 I Output voltage sensor for monitoring Hot Swap MOSFET power. Connects to the source terminal of the hot-swap N channel MOSFET.
OV 9 I Overvoltage comparator input. Connects to resistor divider. HGATE and BGATE are pulled low when OV exceeds the threshold. Connect to ground when not used.
PGHS 5 O Active-high, open-drain power-good indicator.
PLIM 11 I Power-limiting programming pin. A resistor from this pin to GND sets the maximum power dissipation for the Hot Swap FET.
RVSNP 21 I Positive input of the reverse voltage comparator. Connect a resistor from RVSNP to C to set the reverse voltage trip point of the blocking FET.
RVSNM 24 I Negative input of the reverse voltage comparator.
SENM 17 I Current-sensing input for the sensing resistor. Directly connects to the negative terminal of the sensing resistor.
SET 15 I Current-limit programming set pin for hot-swap. A resistor is connected from positive terminal of the sensing resistor.
STAT 6 O High when BGATE is ON.
TFLT 8 I/O Fault timer, which runs when the device goes from regular operation to an over-current condition.
TINR 7 I/O Inrush timer, which runs during the inrush operation (start-up) if the part is in current limit or power limit.
VDD 14 P Power Supply.
(1) I = Input; O = Output ; P = Power

 
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