SLVS681F June   2006  – August 2014 TPS62404

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Options
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 Handling 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 Converter 1
      2. 8.3.2 Converter 2
      3. 8.3.3 DEF_1 Pin Function
      4. 8.3.4 Mode Selection
      5. 8.3.5 Enable
      6. 8.3.6 Soft Start
      7. 8.3.7 Short-Circuit Protection
      8. 8.3.8 Under-Voltage Lockout
      9. 8.3.9 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power Save Mode
      2. 8.4.2 Dynamic Voltage Positioning
      3. 8.4.3 100% Duty Cycle Low Dropout Operation
      4. 8.4.4 180° Out-Of-Phase Operation
    5. 8.5 Programming
      1. 8.5.1 EasyScale: One-Pin Serial Interface for Dynamic Output Voltage Adjustment
        1. 8.5.1.1 General
        2. 8.5.1.2 Protocol
        3. 8.5.1.3 Addressable Registers
          1. 8.5.1.3.1 Bit Decoding
          2. 8.5.1.3.2 Acknowledge
          3. 8.5.1.3.3 MODE Selection
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 TPS6240x, Dual Outputs Step Down Converter
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Converter1 Adjustable Default Output Voltage Setting: TPS62400
          2. 9.2.1.2.2 Converter1 Fixed Default Output Voltage Setting (TPS62401, TPS62402, TPS62403, TPS62404).
          3. 9.2.1.2.3 Converter 2 Adjustable Default Output Voltage Setting TPS62400:
          4. 9.2.1.2.4 Converter 2 Fixed Default Output Voltage Setting
          5. 9.2.1.2.5 Output Filter Design (Inductor and Output Capacitor)
            1. 9.2.1.2.5.1 Inductor Selection
            2. 9.2.1.2.5.2 Output Capacitor Selection
            3. 9.2.1.2.5.3 Input Capacitor Selection
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Various Output Voltages
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
      3. 9.2.3 Dynamic Voltage Scaling on Converter 1 by DEF_1 Pin
        1. 9.2.3.1 Design Requirements
        2. 9.2.3.2 Detailed Design Procedure
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Related Links
    2. 12.2 Trademarks
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

1 Features

  • High Efficiency—Up to 95%
  • VIN Range From 2.5 V to 6 V
  • 2.25-MHz Fixed Frequency Operation
  • Output Current of 400 mA and 600 mA
  • Adjustable Output Voltage From 0.6V to VIN
  • Pin-Selectable Output Voltage Supports Simple Dynamic Voltage Scaling
  • EasyScale™ Optional One-Pin Serial Interface
  • Power Save Mode at Light Load Currents
  • 180° Out-of-Phase Operation
  • Output Voltage Accuracy in PWM Mode ±1%
  • Typical 32-μA Quiescent Current for Both Converters
  • 100% Duty Cycle for Lowest Dropout
  • Available in a 10-Pin VSON (3 mm × 3 mm)

2 Applications

  • Cell Phones, Smart Phones
  • PDAs, Pocket PCs
  • OMAP™ and Low-Power DSP Supply
  • Portable Media Players
  • Digital Radios
  • Digital Cameras

3 Description

The TPS6240x family of devices are synchronous dual step-down DC-DC converters optimized for battery-powered portable applications. The devices provide two independent output voltage rails powered by 1-cell Li-Ion or 3-cell NiMH/NiCD batteries. The devices are also suitable to operate from a standard 3.3-V or 5-V voltage rail.

With an input voltage range from 2.5 V to 6 V, the TPS6240x is ideal to power portable applications like smart phones, PDAs, and other portable equipment.

With the EasyScale serial interface the output voltages can be modified during operation. The fixed output voltage versions TPS62401, TPS62402, TPS62403, and TPS62404 support one-pin controlled simple Dynamic Voltage Scaling for low-power processors.

The TPS6240x operates at a 2.25-MHz fixed switching frequency and enters the power save mode operation at light load currents to maintain high efficiency over the entire load current range. For low noise applications the devices can be forced into fixed frequency PWM mode by pulling the MODE/DATA pin high. In the shutdown mode, the current consumption is reduced to 1.2 μA, typical. The devices allow the use of small inductors and capacitors to achieve a small solution size.

The TPS6240x is available in a 10-pin leadless package (3-mm × 3-mm VSON)

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPS6240x VSON (10) 3.00 mm x 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Simplified Schematic

app_sch_lvs681.gif

Efficiency vs Output Current

swtc_f_lvs681.gif