SLVSHR3 July   2024 TPS551892-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  VCC Power Supply
      2. 6.3.2  EXTVCC Power Supply
      3. 6.3.3  Input Undervoltage Lockout
      4. 6.3.4  Enable and Programmable UVLO
      5. 6.3.5  Soft Start
      6. 6.3.6  Shutdown
      7. 6.3.7  Switching Frequency
      8. 6.3.8  Switching Frequency Dithering
      9. 6.3.9  Inductor Current Limit
      10. 6.3.10 Internal Charge Path
      11. 6.3.11 Output Voltage Setting
      12. 6.3.12 Output Current Monitoring and Cable Voltage Droop Compensation
      13. 6.3.13 Output Current Limit
      14. 6.3.14 Overvoltage Protection
      15. 6.3.15 Output Short Circuit Protection
      16. 6.3.16 Power Good
      17. 6.3.17 Constant Current Output Indication
      18. 6.3.18 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 PWM Mode
      2. 6.4.2 Power Save Mode
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Switching Frequency
        2. 7.2.2.2 Output Voltage Setting
        3. 7.2.2.3 Inductor Selection
        4. 7.2.2.4 Input Capacitor
        5. 7.2.2.5 Output Capacitor
        6. 7.2.2.6 Output Current Limit
        7. 7.2.2.7 Loop Stability
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Third-Party Products Disclaimer
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

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

5.5 Electrical Characteristics

TJ = -40°C to 125°C, VIN = 12 V and VOUT = 20 V. Typical values are at TJ = 25°C, unless otherwise noted.
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
POWER SUPPLY
VINInput voltage range3.027V
VVIN_UVLOUnder voltage lockout thresholdVIN rising2.82.93.0V
VIN falling2.62.652.7V
IQQuiescent current into VIN pinIC enabled, no load, no switching. VIN = 3.0V to 24V, VOUT = 0.8V, VFB = VREF + 0.1V, RFSW=100kΩ, Tj up to 125°C760860µA
Quiescent current into VOUT pinIC enabled, no load, no switching, VIN = 3.0V, VOUT = 3V to 20V, VFB = VREF + 0.1V, RFSW=100kΩ, Tj up to 125°C760860µA
ISDShutdown current into VIN pinIC disabled, VIN = 3.0V to 14V, Tj up to 125°C, EXTVCC pin floating0.83µA
VCCInternal regulator outputIVCC = 50mA, VIN = 8V, VOUT = 20V5.055.25.45V
EN/UVLO
VEN_HEN Logic high thresholdVCC = 3.0V to 5.5V1.15V
VEN_LEN Logic low thresholdVCC = 3.0V to 5.5V0.4V
VEN_HYSEnable threshold hysteresisVCC = 3.0V to 5.5V0.04V
VUVLOUVLO rising threshold at the EN/UVLO pinVCC = 3.0V to 5.5V1.201.231.26V
VUVLO_HYSUVLO threshold hysteresisVCC = 3.0V to 5.5V10mV
IUVLOSourcing current at the EN/UVLO pinVUVLO = 1.3V4.455.6µA
OUTPUT
VOUTOutput voltage range0.822V
VOVPOutput overvoltage protection threshold22.523.524.5V
VOVP_HYSOver voltage protection hysteresis1V
IFB_LKGLeakage current at FB pinTj up to 125°C100nA
IVOUT_LKGLeakage current into VOUT pinIC disabled, VOUT = 20V, VSW2 = 0V, Tj up to 125°C120µA
REFERENCE VOLTAGE
VREFReference voltage at the FB pin1.1881.21.212V
POWER SWITCH
RDS(on)Low-side MOSFET on resistance on buck sideVOUT = 20V, VCC=5.2V22mΩ
High-side MOSFET on resistance on buck sideVOUT = 20V, VCC=5.2V14mΩ
Low-side MOSFET on resistance on boost sideVOUT = 20V, VCC=5.2V11mΩ
High-side MOSFET on resistance on boost sideVOUT = 20V, VCC=5.2V11mΩ
INTERNAL CLOCK
fSWSwitching frequencyRFSW =100k180200220kHz
RFSW =8.4k200022002400kHz
tOFF_minMin. off timeBoost mode90145ns
tON_minMin. on timeBuck mode90130ns
VFSWVoltage at FSW pin1V
CURRENT LIMIT
ILIM_AVGAverage inductor current limitTPS551892-Q1, VIN = 8V, VOUT = 20V, FSW = 400kHz, VCC = 5.2V789A
ILIM_PK_HPeak inductor current limit at high sideTPS551892-Q1, VIN = 8V, VOUT = 20V, FSW = 400kHz13A
ILIM_PK_LPeak inductor current limit at low sideTPS551892-Q1, VIN = 8V, VOUT = 20V, FSW = 400kHz12A
VSNSCurrent loop regulation voltage between ISP and ISN pin485052mV
CABLE VOLTAGE DROP COMPENSATION
VCDCVoltage at the CDC pinRCDC = 20kΩ or floating, VISP – VISN = 50mV0.9511.05V
RCDC = 20kΩ or floating, VISP – VISN = 2mV4075mV
IFB_CDCFB  pin sinking currentExternal output feedback, RCDC = 20kΩ, VISP – VISN = 50mV7.237.57.87µA
External output feedback, RCDC = 20kΩ, VISP – VISN = 0mV00.3µA
External output feedback, RCDC = floating, VISP – VISN = 50mV00.3µA
ERROR AMPLIFIER
ISINKCOMP pin sink currentVFB = VREF + 400mV, VCOMP=1.5V, VCC=5V20µA
ISOURCECOMP pin source currentVFB = VREF - 400mV, VCOMP=1.5V, VCC=5V60µA
VCCLPHHigh clamp voltage at the COMP pinFPWM mode, VOUT  = 1.8V to 22V1.3V
VCCLPLLow clamp voltage at the COMP pinFPWM mode0.7V
GEAError amplifier transconductance190µA/V
SOFT START
tSSSoft-start time2.53.65ms
SPREAD SPECTRUM
IDITH_CHGDithering charge currentVDITH/SYNC = 1.0V; RFSW=49.9kΩ; voltage rising from 0.9V2µA
IDITH_DISDithering discharge currentVDITH/SYNC = 1.0V; RFSW=49.9kΩ; voltage falling from 1.1V2µA
VDITH_HDither high threshold1.07V
VDITH_LDither low threshold0.93V
SYNCHRONOUS CLOCK
VSNYC_HSync clock high voltage threshold1.2V
VSYNC_LSync clock low voltage threshold0.4V
tSYNC_MINMinimum sync clock pulse width50ns
HICCUP
tHICCUPHiccup off time76ms
MODE  
VMODEMODE logic high  thresholdVCC = 3V to 5.5V1.2V
VMODEMODE logic low  thresholdVCC = 3V to 5.5V0.4V
EXTVCC
VEXTVCCEXTVCC Logic high thresholdVCC = 3V to 5.5V1.2V
VEXTVCCEXTVCC Logic Low thresholdVCC = 3V to 5.5V0.4V
Power Good
IPG_HLeakage current into PG pin when outputting high impedanceVPG = 5V100nA
VPG_LOutput low voltage range of the PG pinSinking 4mA current0.10.2V
Current Limit Indication
ICC_HLeakage current into CC pin when outputting high impedanceVCC = 5 V100nA
VCC_LOutput low voltage range of the CC pinSinking 4-mA current0.10.2V
PROTECTION
TSDThermal shutdown thresholdTJ rising175°C
TSD_HYSThermal shutdown hysteresisTJ falling below Tsd20°C