SLVSG70 april   2023 TPS62902-Q1

PRODUCTION DATA  

  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 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Mode Selection and Device Configuration MODE/S-CONF
      2. 8.3.2  Adjustable VO Operation (External Voltage Divider)
      3. 8.3.3  Selectable VO Operation (VSET and Internal Voltage Divider)
      4. 8.3.4  Soft Start and Tracking (SS/TR)
        1. 8.3.4.1 Tracking Function
      5. 8.3.5  Smart Enable with Precise Threshold
      6. 8.3.6  Power Good (PG)
      7. 8.3.7  Output Discharge Function
      8. 8.3.8  Undervoltage Lockout (UVLO)
      9. 8.3.9  Current Limit and Short-Circuit Protection
      10. 8.3.10 High Temperature Specifications
      11. 8.3.11 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Forced Pulse Width Modulation (FPWM) Operation
      2. 8.4.2 Power Save Mode Operation (Auto PFM and PWM)
      3. 8.4.3 AEE (Automatic Efficiency Enhancement)
      4. 8.4.4 100% Duty-Cycle Operation
      5. 8.4.5 Starting into a Prebiased Load
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application with Adjustable Output Voltage
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Custom Design With WEBENCH® Tools
        2. 9.2.2.2 Programming the Output Voltage
        3. 9.2.2.3 External Component Selection
          1. 9.2.2.3.1 Output Filter and Loop Stability
          2. 9.2.2.3.2 Inductor Selection
          3. 9.2.2.3.3 Capacitor Selection
            1. 9.2.2.3.3.1 Output Capacitor
            2. 9.2.2.3.3.2 Input Capacitor
            3. 9.2.2.3.3.3 Soft-Start Capacitor
      3. 9.2.3 Application Curves
        1. 9.2.3.1 Application Curves Vout = 1.8 V
        2. 9.2.3.2 Application Curves Vout = 1.2 V
        3. 9.2.3.3 Application Curves Vout = 0.6 V
    3. 9.3 Typical Application with Selectable VOUT using VSET
      1. 9.3.1 Design Requirements
      2. 9.3.2 Detailed Design Procedure
        1. 9.3.2.1 Programming the Output Voltage
      3. 9.3.3 Application Curves
        1. 9.3.3.1 Application Curves Vout = 5 V
        2. 9.3.3.2 Application Curves Vout = 3.3 V
    4. 9.4 System Examples
      1. 9.4.1 LED Power Supply
      2. 9.4.2 Powering Multiple Loads
      3. 9.4.3 Voltage Tracking
      4. 9.4.4 Inverting Buck-Boost (IBB)
    5. 9.5 Power Supply Recommendations
    6. 9.6 Layout
      1. 9.6.1 Layout Guidelines
      2. 9.6.2 Layout Example
      3. 9.6.3 Thermal Considerations
  10. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Third-Party Products Disclaimer
      2. 10.1.2 Development Support
        1. 10.1.2.1 Custom Design With WEBENCH® Tools
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Receiving Notification of Documentation Updates
    4. 10.4 Support Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

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

8.3.1 Mode Selection and Device Configuration MODE/S-CONF

With MODE/S-CONF (SmartConfig), this device features an input with two functions. This pin can be used to customize the device behavior in two ways:

  • Select the device mode (Forced PWM or Auto PFM /PWM with AEE operation) with a HIGH-level or LOW-level.
  • Select the device configuration (switching frequency, internal or external feedback, output discharge, and auto PFM/PWM mode) by connecting a single resistor to the MODE/S-CONF pin.

The TPS62902-Q1 interprets this pin during the start-up sequence after the internal OTP readout and before the device starts switching in soft start (see Figure 8-1). If the device reads a HIGH-level or LOW-level, the dynamic mode change is active and auto PFM/PWM or FPWM mode can be changed during operation. If the TPS62902-Q1 reads a resistor value, the device is configured according to the resistance value in Table 8-1 and there is no further interpretation during operation and device mode or other configurations can only be changed by power cycling or disabling the device.

Note: The MODE/S-CONF pin must not be left floating. Connect the pin high, low, or to a resistor to configure the device according to Table 8-1.

GUID-20221011-SS0I-4JNB-PBKD-TRDTLR0CLWJ9-low.svg Figure 8-1 Interpretation of S-CONF and VSET Flow
Table 8-1 SmartConfig Setting Table
#Level Or Resistor Value [Ω] (1)FB/VSET PinFSW (MHz)Output DischargeMode (Auto Or Forced PWM)Dynamic Mode Change
Setting Options by Level
1GNDExternal FB2.5(2)yesAuto PFM/PWM with AEE Active
2HIGH (> VIH_MODE)External FB2.5yesForced PWM
Setting Options by Resistor
37.15 kExternal FB2.5(2)noAuto PFM/PWM with AEENot active
48.87 kExternal FB2.5noForced PWM
511.0 kExternal FB1yesAuto PFM/PWM
613.7 kExternal FB1yesForced PWM
716.9 kExternal FB1noAuto PFM/PWM
821.0 kExternal FB1noForced PWM
926.1 kVSET2.5(2)yesAuto PFM/PWM with AEE
1032.4 kVSET2.5yesForced PWM
1140.2 kVSET2.5(2)noAuto PFM/PWM with AEE
1249.9 kVSET2.5noForced PWM
1361.9 kVSET1yesAuto PFM/PWM
1476.8 kVSET1yesForced PWM
1595.3 kVSET1noAuto PFM/PWM
16118 kVSET1noForced PWM
(1) E96 resistor series, 1% accuracy, temperature coefficient better or equal than ±200 ppm/°C
(2) FSW varies based on VIN and VOUT. See Section 8.4.3 for more details.