SLVSCV6A January   2015  – February 2015 TPS24740 , TPS24741 , TPS24742

PRODUCTION DATA.  

  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

Package Options

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

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