SLUSDX7A September   2020  – October 2020 TPS51397A

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 PWM Operation and DCAP3 Control
      2. 7.3.2 Soft Start
      3. 7.3.3 Large Duty Operation
      4. 7.3.4 Power Good
      5. 7.3.5 Overcurrent Protection and Undervoltage Protection
      6. 7.3.6 Overvoltage Protection
      7. 7.3.7 UVLO Protection
      8. 7.3.8 Output Voltage Discharge
      9. 7.3.9 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Light Load Operation
      2. 7.4.2 Advanced Eco-mode Control
      3. 7.4.3 Out-of-Audio
      4. 7.4.4 Mode Selection
      5. 7.4.5 Standby Operation
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 External Component Selection
          1. 8.2.2.1.1 Output Voltage Set Point
          2. 8.2.2.1.2 MODE Selection
          3. 8.2.2.1.3 Inductor Selection
          4. 8.2.2.1.4 Output Capacitor Selection
          5. 8.2.2.1.5 Input Capacitor Selection
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Support Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

6.5 Electrical Characteristics

TJ = -40°C to 125°C, VIN = 12 V, unless otherwise noted.
PARAMETERTEST CONDITIONMINTYPMAXUNIT
SUPPLY CURRENT
VINInput voltage range4.524V
IVINNon-switching supply currentNo load, VEN = 5V

90

110

150

μA
IVINSDNShutdown supply currentNo load, VEN = 0V

1

2

4

μA
VCC OUTPUT
VCCVCC output voltageVIN > 5.0V4.8555.15V
VIN = 4.5V4.5
ICCVCC current limit

20

mA
FEEDBACK VOLTAGE
VFBFB voltageTJ = 25°C594600606mV
TJ = -40°C to 125°C591600609mV
DUTY CYCLE and FREQUENCY CONTROL
FSWSwitching frequencyVOUT = 2.5V

450

500

550

kHz
tON(MIN)SW minumum on time

30

60

100

ns
tOFF(MIN)SW minimum off timeVFB = 0.5V

130

180ns
OOA Function
TOOAMode Operation Period

22

30

42

us
MOSFET and DRIVERS
RDS(ON)HHigh side switch resistanceTJ = 25°C17mΩ
RDS(ON)LLow side switch resistanceTJ = 25°C5.9mΩ
OUTPUT DISCHARGE and SOFT START
RDISDischarge resistanceVEN = 0V

300

350

400

Ω
tSSSoft start timeInternal soft-start time, SS pin floating

0.5

1.2

2.5

ms
ISSSoft start charge current 5 μA
POWER GOOD
tPGDLYPG start-up delayPG from low to high 1 ms
VPGTHPG thresholdVFB falling (fault)85%
VFB rising (good)90%
VFB rising (fault)115%
VFB falling (good)110%
VPG_LPG sink current capabilityIOL = 4mA0.4V
IPGLKPG leak currentVPGOOD = 5.5V1μA
CURRENT LIMIT
IOCLOver current threshold (valley)TJ = 25°C111213A
TJ = -40°C to 125°C10.51214A
INOCLNegative over current threshold 3.2 A
LOGIC THRESHOLD
VENHEN high-level input voltage1.21.31.4V
VENLEN low-level input voltage0.91.11.2V
IENEnable internal pull down currentVEN = 0.8V 2 µA
OUTPUT UNDERVOLTAGE AND OVERVOLTAGE PROTECTION
VOVPOVP trip threshold125%
tOVPDLYOVP prop deglitch120us
VUVPUVP trip threshold60%
tUVPDLYUVP prop deglitch256us
UVLO
VUVLOVIN UVLO thresholdWake up

4.1

4.24.4V
Shutdown3.63.7

3.9

V
Hysteresis0.5V
OVER TEMPERATURE PROTECTION
TOTPOTP trip threshold(1)Shutdown temperature150°C
TOTPHSYOTP hysteresis(1)Hysteresis20°C
(1) Not production tested.