SLUSFR2 November   2024 BQ21088

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Description (continued)
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Thermal Information
    4. 6.4 Recommended Operating Conditions
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
      1. 7.1.1 Battery Charging Process
        1. 7.1.1.1 Trickle Charge
        2. 7.1.1.2 Pre-Charge
        3. 7.1.1.3 Fast Charge
        4. 7.1.1.4 Termination
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Input Voltage Based Dynamic Power Management (VINDPM)
      2. 7.3.2  Dynamic Power Path Management Mode (DPPM)
      3. 7.3.3  Battery Supplement Mode
      4. 7.3.4  Sleep Mode
      5. 7.3.5  SYS Power Control (SYS_MODE bit control)
        1. 7.3.5.1 SYS Pulldown Control
      6. 7.3.6  SYS Regulation
      7. 7.3.7  ILIM Control
      8. 7.3.8  Protection Mechanisms
        1. 7.3.8.1 Input Overvoltage Protection
        2. 7.3.8.2 Battery Undervoltage Lockout
        3. 7.3.8.3 Battery Overcurrent Protection
        4. 7.3.8.4 System Overvoltage Protection
        5. 7.3.8.5 System Short Protection
        6. 7.3.8.6 Thermal Protection and Thermal Regulation
        7. 7.3.8.7 Safety Timer and Watchdog Timer
      9. 7.3.9  Pushbutton Wake and Reset Input
        1. 7.3.9.1 Pushbutton Wake or Short Button Press Functions
        2. 7.3.9.2 Pushbutton Reset or Long Button Press Functions
      10. 7.3.10 15-Second Timeout for HW Reset
      11. 7.3.11 Hardware Reset
      12. 7.3.12 Software Reset
      13. 7.3.13 Interrupt Indicator (/INT) Pin
      14. 7.3.14 External NTC Monitoring (TS)
        1. 7.3.14.1 TS Biasing and Function
      15. 7.3.15 I2C Interface
        1. 7.3.15.1 F/S Mode Protocol
    4. 7.4 Device Functional Modes
    5. 7.5 Register Maps
      1. 7.5.1 I2C Registers
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Application
      2. 8.2.2 Design Requirements
      3. 8.2.3 Detailed Design Procedure
      4. 8.2.4 Application Curves
  10. 9 Power Supply Recommendations
  11. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • YBG|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.2.4 Application Curves

CIN = 1 µF, COUT = 10 µF, VIN = 5 V, VOUT = 3.8 V, ICHG = 10 mA (unless otherwise specified)

BQ21088 Power Up with IN Supply Insertion with No Battery

VIN = 5 V

VBAT = Floating

Figure 8-2 Power Up with IN Supply Insertion with No Battery
BQ21088 Power Up from Shipmode with VIN Insertion
VIN = 0 V → 5 V

VBAT = 3.8 V

Figure 8-4 Power Up from Shipmode with VIN Insertion
BQ21088 Hardware Reset with /TSMR Press
MR_LPRESS = 00 (5s Long Press Timer)
PB_LPRESS_ACTION = 01 (Hardware Reset)
Figure 8-6 Hardware Reset with /TSMR Press
BQ21088 Hardware Reset Through I2C
Figure 8-8 Hardware Reset Through I2C
BQ21088 Shipmode Entry on VIN Removal
EN_RST_SHIP = 10 (enable shutdown with wake on adapter insert only)
Figure 8-10 Shipmode Entry on VIN Removal
BQ21088 Shutdown Mode Entry with Push Button Long Press
VIN = 0 V
PB_LPRESS_ACTION = 11 (enable shutown mode)

MR_LPRESS = 00 (5 seconds)

Figure 8-12 Shutdown Mode Entry with Push Button Long Press
BQ21088 SYS Mode Sweep

SYS_MODE = 00 → 01 → 10 → 11

Figure 8-14 SYS Mode Sweep
BQ21088 Wake2 Interrupt with VIN Present

WAKE1 = 1 s

WAKE2 = 3 s

PB_LPRESS_ACTION = HW Reset

MR_LPRESS = 5 s

Figure 8-16 Wake2 Interrupt with VIN Present
BQ21088 Power Up from Shutdown Mode with VIN Supply Insertion

VIN = 5 V

VBAT = 3.6 V

Figure 8-3 Power Up from Shutdown Mode with VIN Supply Insertion
BQ21088 Power Up from Shipmode with /TSMR Button Press

MR_LPRESS = 00 (5s Long Press Timer)

Figure 8-5 Power Up from Shipmode with /TSMR Button Press
BQ21088 Enter Shipmode with Push Button Long Press
MR_LPRESS = 00 (5s Long Press Timer) PB_LPRESS_ACTION = 10
Figure 8-7 Enter Shipmode with Push Button Long Press
BQ21088 Shutdown Entry on VIN Removal

EN_RST_SHIP = 01 (enable shutdown with wake on adapter insert only)

Figure 8-9 Shutdown Entry on VIN Removal
BQ21088 Power Good Interrupt on /INT
VIN = 0 V → 5 V → 0 V
Figure 8-11 Power Good Interrupt on /INT
BQ21088 SYS Regulation Sweep
SYS_REG_CTRL = 000 → 111 in steps
Figure 8-13 SYS Regulation Sweep
BQ21088 Wake1, Wake2, LP_Warn and Hardware Reset

WAKE1 = 300 ms

WAKE2 = 2 s

PB_LPRESS_ACTION = HW Reset

MR_LPRESS = 5 s

Figure 8-15 Wake1, Wake2, LP_Warn and Hardware Reset