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  • TPS62136, TPS621361 1-MHz High Accuracy 3-V to 17-V 4-A Step-Down Converters with DCS ControlTM

    • SLVSDV2 March   2017 TPS62136

      PRODUCTION DATA.  

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  • TPS62136, TPS621361 1-MHz High Accuracy 3-V to 17-V 4-A Step-Down Converters with DCS ControlTM
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  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 Parameter Measurement Information
    1. 8.1 Schematic
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Precise Enable
      2. 9.3.2 Power Good (PG)
      3. 9.3.3 Pin-Selectable Output Voltage (VSEL and FB2)
      4. 9.3.4 MODE
      5. 9.3.5 Undervoltage Lockout (UVLO)
      6. 9.3.6 Thermal Shutdown
    4. 9.4 Device Functional Modes
      1. 9.4.1 Pulse Width Modulation (PWM) Operation
      2. 9.4.2 Power Save Mode Operation (PWM/PFM)
      3. 9.4.3 100% Duty-Cycle Operation
      4. 9.4.4 HICCUP Current Limit And Short Circuit Protection (TPS62136 only)
      5. 9.4.5 Current Limit And Short Circuit Protection (TPS621361 only)
      6. 9.4.6 Soft-Start / Tracking (SS/TR)
      7. 9.4.7 Output Discharge Function (TPS62136 only)
      8. 9.4.8 Starting into a Pre-Biased Load (TPS621361 only)
  10. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1 Programming the Output Voltage
      2. 10.1.2 External Component Selection
      3. 10.1.3 Inductor Selection
      4. 10.1.4 Capacitor Selection
        1. 10.1.4.1 Output Capacitor
        2. 10.1.4.2 Input Capacitor
        3. 10.1.4.3 Soft-Start Capacitor
      5. 10.1.5 Tracking Function
      6. 10.1.6 Output Filter and Loop Stability
    2. 10.2 Typical Applications
      1. 10.2.1 Typical Application with Adjustable Output Voltage
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
        3. 10.2.1.3 Application Curves
      2. 10.2.2 Typical Application using VSEL and FB2
        1. 10.2.2.1 Design Requirements
        2. 10.2.2.2 Detailed Design Procedure
        3. 10.2.2.3 Application Curves
    3. 10.3 System Examples
      1. 10.3.1 LED Power Supply
      2. 10.3.2 Powering Multiple Loads
      3. 10.3.3 Voltage Tracking
      4. 10.3.4 Precise Soft-Start Timing
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
    3. 12.3 Thermal Considerations
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 Third-Party Products Disclaimer
    2. 13.2 Receiving Notification of Documentation Updates
    3. 13.3 Related Links
    4. 13.4 Community Resources
    5. 13.5 Trademarks
    6. 13.6 Electrostatic Discharge Caution
    7. 13.7 Glossary
  14. 14Mechanical, Packaging, and Orderable Information
  15. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • RGX|11
    • MPQF454
Thermal pad, mechanical data (Package|Pins)
Orderable Information
  • slvsdv2_oa
  • slvsdv2_pm
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DATA SHEET

TPS62136, TPS621361 1-MHz High Accuracy 3-V to 17-V 4-A Step-Down Converters with DCS ControlTM

1 Features

  • Output Voltage Accuracy ± 1% (PWM mode)
  • Input Voltage Range: 3 V to 17 V
  • Quiescent Current 18 µA Typ
  • Output Voltage from 0.8 V to 12 V
  • Adjustable Soft-Start
  • Forced PWM or PWM/PFM operation
  • Typical switching frequency of 1 MHz in forced PWM
  • Precise ENABLE input allows
    • User-Defined Undervoltage Lockout
    • Exact Sequencing
  • 100% Duty Cycle Mode
  • Automatic Efficiency Enhancement AEE™
  • DCS-Control™ Topology
  • Available with Active Output Discharge
  • Optional HICCUP Overcurrent Protection
  • Power Good Output
  • Available in 3-mm x 2-mm VQFN Package

2 Applications

  • Standard 12-V Rail Supplies
  • POL for Connected Standby Requirements
  • POL Supply from Single or Multiple Li-Ion Battery
  • Gaming Consoles, SSD Drives
  • Mobile and Embedded Computers

3 Description

The TPS62136 and TPS621361 are high efficiency and easy to use synchronous step-down DC-DC converters, based on the DCS-Control™ Topology. The devices wide input voltage range of 3-V to 17-V makes it suitable for multi-cell Li-Ion as well as 12-V intermediate supply rails. The devices provide 4-A continuous output current. The TPS62136 automatically enters Power Save Mode at light loads to maintain high efficiency across the whole load range. With that, the device is well suited for applications that require connected standby performance, like ultra low power computers. With the MODE pin set to low, the switching frequency of the device is adapted automatically based on the input and output voltage. This technique is called Automatic Efficiency Enhancement (AEE™) and maintains high conversion efficiency over the whole operation range. It provides a 1% output voltage accuracy in PWM mode and therefore enables the design of a power supply with high output voltage accuracy.

The device has a typical quiescent current of 18 µA. In shutdown mode the current is typically 1 µA and the output is actively discharged for TPS62136 while the output voltage discharge feature is disabled in TPS621361.

The TPS62136 is available as an adjustable version, packaged in a 3-mm x 2-mm VQFN package.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TPS62136 VQFN 3.00 mm x 2.00 mm
TPS621361 VQFN 3.00 mm x 2.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

space

Simplified Schematic

TPS62136 TPS621361 TPS62136_schematics_adjustable_firstpage.gif

Efficiency vs Output Current for Vo = 5 V

TPS62136 TPS621361 D010_SLVSDV2.gif

4 Revision History

DATE REVISION NOTES
March 2017 * Initial release.

5 Device Comparison Table

DEVICE NUMBER FEATURES OUTPUT VOLTAGE MARKING
TPS62136RGX nominal switching frequency = 1 MHz
output voltage discharge
voltage selection input / output VSEL/FB2
HICCUP current limit		 adjustable 62136
TPS621361RGX nominal switching frequency = 1 MHz
voltage selection input / output VSEL/FB2		 adjustable 621361
TPS62135RGX(1) nominal switching frequency = 2.5 MHz
output voltage discharge
voltage selection input / output VSEL/FB2
HICCUP current limit		 adjustable 62135
TPS621351RGX(1) voltage selection input / output VSEL/FB2
nominal switching frequency = 2.5 MHz		 adjustable 621351
(1) Please see the TPS62135, TPS621351 data sheet for details

6 Pin Configuration and Functions

RGX Package
11-Pin VQFN
TPS62136 TPS621361 TPS62135_packagedrawing_2.gif

Pin Functions

PIN I/O DESCRIPTION
NAME NUMBER
EN 8 I This is the enable pin of the device. Connect to logic low to disable the device. Pull high to enable the device. Do not leave this pin unconnected.
FB 5 I Voltage feedback input, connect resistive output voltage divider to this pin.
FB2 4 O Open drain of an internal switch to GND. Allows to turn on a resistor in parallel to the feedback resistor R2 and increase the output voltage with VSEL = high.
GND 3 Ground pin.
MODE 10 I The device runs in PFM/PWM mode when this pin is pulled low. When the pin is pulled high, the device runs in forced PWM mode. Do not leave this pin unconnected.
PG 7 O Open drain power good output.
SS/TR 9 I Soft-Start / Tracking pin. An external capacitor connected from this pin to GND defines the rise time for the internal reference voltage. The pin can also be used as an input for tracking and sequencing - see Detailed Description section in this document.
SW 2 This is the switch pin of the converter and is connected to the internal Power MOSFETs.
VIN 1 Power supply input. Make sure the input capacitor is connected as close as possible between pin VIN and GND.
VOS 6 I Output voltage sense pin. Connect directly to the positive pin of the output capacitor.
VSEL 11 I Voltage scaling control input. Turns on an internal switch from FB2 to GND when this pin is set high.

 
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