SLVSAX7E August   2011  – August 2016 TPS65270

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  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 Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Adjustable Switching Frequency
      2. 8.3.2  Out-of-Phase Operation
      3. 8.3.3  Delayed Start-Up
      4. 8.3.4  Soft-Start Time
      5. 8.3.5  Adjusting the Output Voltage
      6. 8.3.6  Error Amplifier
      7. 8.3.7  Slope Compensation
      8. 8.3.8  Overcurrent Protection
      9. 8.3.9  Thermal Shutdown
      10. 8.3.10 Low Power Mode Operation
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operation With Minimum VIN (VIN < 4.45 V)
      2. 8.4.2 Operation With EN Control
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Output Inductor Selection
        2. 9.2.2.2 Output Capacitor Selection
        3. 9.2.2.3 Input Capacitor Selection
        4. 9.2.2.4 Bootstrap Capacitor Selection
        5. 9.2.2.5 Loop Compensation
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Power Dissipation
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

6 Pin Configuration and Functions

PWP Package
24-Pin HTSSOP
Top View
RGE Package
24-Pin VQFN
Top View

Pin Functions

PIN I/O DESCRIPTION
NAME HTSSOP VQFN
AGND 7 22 Power Analog ground. Connect all GND pins and power pad together.
BST1 24 15 O Bootstrapped power supply to high side floating gate driver in Buck 1. Connect a 47-nF ceramic capacitor from this pin to the switching node pin LX1.
BST2 13 4 O Bootstrapped power supply to high side floating gate driver in Buck 2. Connect a 47-nF ceramic capacitor from this pin to the switching node pin LX2.
COMP1 4 19 O Loop compensation pin for Buck 1. Connect a series RC circuit to this pin to compensate the control loop of this converter.
COMP2 9 24 O Loop compensation pin for Buck 2. Connect a series RC circuit to this pin to compensate the control loop of this converter.
EN1 1 16 I Enable for Buck 1. Logic high enables the Buck 1; Logic low disables Buck 1. If pin is left open a weak internal pullup to internal V5V allows for automatic enable; For a delayed start-up add a small ceramic capacitor from this pin to ground.
EN2 12 3 I Enable for Buck 2. Logic high enables the Buck 2. Logic low disables Buck 2. If pin is left open a weak internal pullup to internal V5V allows for automatic enable; For a delayed start-up add a small ceramic capacitor from this pin to ground.
FB1 2 17 I Feedback voltage for Buck 1. Connect a resistor divider to set 0.8 V from the output of the converter to ground.
FB2 11 2 I Feedback voltage for Buck 2. Connect a resistor divider to set 0.8 V from the output of the converter to ground.
GND 17, 18, 19, 20 8, 9, 10, 11 Power Power ground for Buck 1 and Buck 2.
LOW_P 5 20 I Low power operation mode. With active high, Buck 1 and Buck 2 operate at pulse skipping mode at light load; active low forces both Buck 1 and Buck 2 to PWM mode; this pin cannot be left open.
LX1 21, 22 12, 13 O Switching node connecting to inductor for Buck 1.
LX2 15, 16 6, 7 O Switching node connecting to inductor for Buck 2.
ROSC 8 23 O Oscillator frequency setup. Connect a resistor to ground to set the frequency of internal oscillator clock.
SS1 3 18 O Soft start input for Buck 1. An internal 5-µA charging current is sourcing to this pin. Connect a small ceramic capacitor to this pin to set the Buck 1 soft-start time.
SS2 10 1 O Soft start input for Buck 2. An internal 5-µA charging current is sourcing to this pin. Connect a small ceramic capacitor to this pin to set the Buck 1 soft-start time.
VCC 6 21 O Internal 6.5-V power supply bias. Connect a 10-µF ceramic capacitor from this pin to ground.
VIN1 23 14 Power Input supply for Buck 1. Conne ct a 10-µF ceramic capacitor close to this pin.
VIN2 14 5 Power Input supply for Buck 2. Connect a 10-µF ceramic capacitor close to this pin.
Thermal Pad — — — Must be soldered to PCB for optimal thermal performance. Have thermal vias on the PCB to enhance power dissipation.