SLVSHK6 March   2025 TPS61381-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 I2C Timing Characteristics
    7. 5.7 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 and UVLO Logic
      2. 6.3.2 Enable or Shutdown
      3. 6.3.3 Device Operating Modes and Control Logic
      4. 6.3.4 Configured as Status Indicatior
      5. 6.3.5 Thermal Shutdown
    4. 6.4 Charger Feature Description
      1. 6.4.1 Charger Enable
      2. 6.4.2 LDO Charger
      3. 6.4.3 NiMH Battery Charging Profile
      4. 6.4.4 Lithium Battery Charging Profile
      5. 6.4.5 Super Capacitor Charging Profile
      6. 6.4.6 Battery Cold, Hot Temperature (TS Pin)
      7. 6.4.7 Charger Protection and Fault Condition Indication
    5. 6.5 Boost Feature Description
      1. 6.5.1 Enable and Start up
        1. 6.5.1.1 Automatic Transition into Boost Mode
        2. 6.5.1.2 Manual Transition into Boost Mode
      2. 6.5.2 Down Mode
      3. 6.5.3 Output Short- to-Ground Protection
      4. 6.5.4 Boost Control Loop
      5. 6.5.5 Current Limit Operation
      6. 6.5.6 Functional Modes at Light Load
        1. 6.5.6.1 Auto PFM Mode
        2. 6.5.6.2 Forced PWM Mode
      7. 6.5.7 Duty Cycle Limitation
      8. 6.5.8 BUB Voltage Loop
      9. 6.5.9 Spread Spectrum
    6. 6.6 Battery State-of-Health (SOH) Detection Feature Description
      1. 6.6.1 SOH Mode Operation
      2. 6.6.2 Multi-Signal Output in AVI Pin
      3. 6.6.3 Calculate Impedance of BUB
    7. 6.7 I2C Serial Interface
      1. 6.7.1 Data Validity
      2. 6.7.2 START and STOP Conditions
      3. 6.7.3 Byte Format
      4. 6.7.4 Acknowledge (ACK) and Not Acknowledge (NACK)
      5. 6.7.5 Slave Address and Data Direction Bit
      6. 6.7.6 Single Read and Write
      7. 6.7.7 Multi-Read and Multi-Write
  8. 7 Register Maps
    1. 7.1  Register 00H: CHIP_ID
    2. 7.2  Register 01H: BOOST_SET1
    3. 7.3  Register 02H: BOOST_SET2
    4. 7.4  Register 03H: BOOST_SET3
    5. 7.5  Register 04H: CHGR_SET1
    6. 7.6  Register 05H: CHGR_SET2
    7. 7.7  Register 06H: CHGR_SET3
    8. 7.8  Register 07H: CHGR_SET4
    9. 7.9  Register 08H: CHGR_STATUS
    10. 7.10 Register 09H: SOH_SET1
    11. 7.11 Register 0AH: SOH_SET2
    12. 7.12 Register 0BH: CONTROL_STATUS
    13. 7.13 Register 0CH: FAULT_CONDITION
    14. 7.14 Register 0DH: STATUS_PIN_SET
    15. 7.15 Register 0EH: SW_RST
  9. 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 Selecting the External MOSFET
        2. 8.2.2.2 Inductor Selection
        3. 8.2.2.3 Capacitor in Back-Up Battery Side
        4. 8.2.2.4 Selecting the Output Capacitor
        5. 8.2.2.5 Loop Stability and Compensation Design
          1. 8.2.2.5.1 Small Signal Analysis
          2. 8.2.2.5.2 Loop Compensation Design
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.5 Register 04H: CHGR_SET1

Figure 7-6 CHGR_SET1
7 6 5 4 3 2 1 0
BUB_TYP BST_VINLOOP_EN BST_WAKE
R/W-00b R/W-0000b R/W-00b
Figure 7-7 CHGR_SET1 Register Field Descriptions
Bit Field Type Reset Description

[7:6]

BUB_TYP

R/W

00b

Set the back-up battery charging strategy

00b=Li-ion charging profile, precharge+CC+CV

01b=LiFePO4 charging profile, precharge+CC+CV

10b=NiMH charging profile, CC + timer

11b=Super capacitor charging profile, CC+CV

[5:2]

BUB_CV

R/W

0000b

Set CV voltage

0000b=1.7V (supercap)

0001b=2.0V (supercap)

0010b=2.2V (supercap)

0011b=2.4V (supercap)

0100b=2.5V (supercap)

0101b=2.7V (supercap)

0110b=3.0V (supercap)

0111b=3.5V (LiFePO4)

1000b=3.6V (LiFePO4)

1001b=3.7V (LiFePO4)

1010b=3.8V (Li-ion)

1011b=3.9V (Li-ion)

1100b=4.05V (Li-ion)

1101b=4.10V (Li-ion)

1110b=4.20V (Li-ion)

1111b=4.35V (Li-ion)

Note: this register is inactive for NiMH battery.

[1:0]

BUB_NIMH_TIMER

R/W

00b

Set the NiMH battery charging time

00b=4h

01b=8h

10b=16h

11b=32h